//***************************************************************************** // // am_hal_iom.c //! @file //! //! @brief Functions for interfacing with the IO Master module //! //! @addtogroup iom2 IO Master (SPI/I2C) //! @ingroup apollo2hal //! @{ // //***************************************************************************** //***************************************************************************** // // Copyright (c) 2017, Ambiq Micro // All rights reserved. // // Redistribution and use in source and binary forms, with or without // modification, are permitted provided that the following conditions are met: // // 1. Redistributions of source code must retain the above copyright notice, // this list of conditions and the following disclaimer. // // 2. Redistributions in binary form must reproduce the above copyright // notice, this list of conditions and the following disclaimer in the // documentation and/or other materials provided with the distribution. // // 3. Neither the name of the copyright holder nor the names of its // contributors may be used to endorse or promote products derived from this // software without specific prior written permission. // // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" // AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE // IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE // ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE // LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR // CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF // SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS // INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN // CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) // ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE // POSSIBILITY OF SUCH DAMAGE. // // This is part of revision 1.2.9 of the AmbiqSuite Development Package. // //***************************************************************************** #include #include #include "am_mcu_apollo.h" //#include "am_util_delay.h" #ifdef __IAR_SYSTEMS_ICC__ #define AM_INSTR_CLZ(n) __CLZ(n) #else #define AM_INSTR_CLZ(n) __builtin_clz(n) #endif //! ASSERT(1) or Correct(0) invalid IOM R/W Thresholds. #ifndef AM_ASSERT_INVALID_THRESHOLD #define AM_ASSERT_INVALID_THRESHOLD (1) #endif uint32_t am_util_wait_status_change(uint32_t ui32Iterations, uint32_t ui32Address, uint32_t ui32Mask, uint32_t ui32Value) { int i; for (i = 0; i < ui32Iterations; i++) { // Check the status if (((*(uint32_t *)ui32Address) & ui32Mask) == ui32Value) { return 1; } // Call the BOOTROM cycle delay function to get about 1 usec @ 48MHz am_hal_flash_delay(16); } return 0; } //***************************************************************************** // // Forcing optimizations // // These pragmas must be enabled if we intend to use the IOM4 workaround with a // delay higher than 18-bits in the first word. // //***************************************************************************** //#ifdef __IAR_SYSTEMS_ICC__ //#pragma optimize=3 s //#endif // //#ifdef __ARMCC_VERSION //#pragma O3 //#endif // //#ifdef __GNUC__ //#pragma GCC optimize ("O3") //#endif //***************************************************************************** // // Forward declarations. // //***************************************************************************** static void iom_workaround_loop(uint32_t ui32PadRegVal, volatile uint32_t *pui32PadReg, bool bRising); static uint32_t internal_am_hal_iom_spi_cmd_construct(uint32_t ui32Operation, uint32_t ui32ChipSelect, uint32_t ui32NumBytes, uint32_t ui32Options); //***************************************************************************** // // IOM Buffer states. // //***************************************************************************** #define BUFFER_IDLE 0x0 #define BUFFER_SENDING 0x1 #define BUFFER_RECEIVING 0x2 //***************************************************************************** // // Global state variables // //***************************************************************************** // // Save error status from ISR, particularly for use in I2C queue mode. // uint32_t g_iom_error_status = 0; // // Define a structure to map CE for IOM4 only. // typedef struct { uint8_t channel; // CE channel for SPI uint8_t pad; // GPIO Pad uint8_t funcsel; // FNCSEL value } IOMPad_t; // Define the mapping between SPI CEn, Pads, and FNCSEL values for all IOMs. const IOMPad_t g_IOMPads[] = { {0, 29, 6}, {0, 34, 6}, {1, 18, 4}, {1, 37, 5}, {2, 41, 6}, {3, 17, 4}, {3, 45, 4}, {4, 10, 6}, {4, 46, 6}, {5, 9, 4}, {5, 47, 6}, {6, 35, 4}, {7, 38, 6} }; #define WORKAROUND_IOM 4 #define WORKAROUND_IOM_MOSI_PIN 44 #define WORKAROUND_IOM_MOSI_CFG AM_HAL_PIN_44_M4MOSI #define MAX_IOM_BITS 9 #define IOM_OVERHEAD_FACTOR 2 //***************************************************************************** // // Non-blocking buffer and buffer-management variables. // //***************************************************************************** typedef struct { uint32_t ui32State; uint32_t *pui32Data; uint32_t ui32BytesLeft; uint32_t ui32Options; void (*pfnCallback)(void); } am_hal_iom_nb_buffer; // // Global State to keep track if there is an ongoing transaction // volatile bool g_bIomBusy[AM_REG_IOMSTR_NUM_MODULES] = {0}; am_hal_iom_nb_buffer g_psIOMBuffers[AM_REG_IOMSTR_NUM_MODULES]; //***************************************************************************** // // Computed timeout. // // The IOM may not always respond to events (e.g., CMDCMP). This is a // timeout value in cycles to be used when waiting on status changes. //***************************************************************************** uint32_t ui32StatusTimeout[AM_REG_IOMSTR_NUM_MODULES]; //***************************************************************************** // // Queue management variables. // //***************************************************************************** am_hal_queue_t g_psIOMQueue[AM_REG_IOMSTR_NUM_MODULES]; //***************************************************************************** // // Default queue flush function // //***************************************************************************** am_hal_iom_queue_flush_t am_hal_iom_queue_flush = am_hal_iom_sleeping_queue_flush; //***************************************************************************** // // Power management structure. // //***************************************************************************** am_hal_iom_pwrsave_t am_hal_iom_pwrsave[AM_REG_IOMSTR_NUM_MODULES]; //***************************************************************************** // // Static helper functions // //***************************************************************************** //***************************************************************************** // onebit() //***************************************************************************** // // A power of 2? // Return true if ui32Value has exactly 1 bit set, otherwise false. // static bool onebit(uint32_t ui32Value) { return ui32Value && !(ui32Value & (ui32Value - 1)); } //***************************************************************************** // compute_freq() //***************************************************************************** // // Compute the interface frequency based on the given parameters // static uint32_t compute_freq(uint32_t ui32HFRCfreqHz, uint32_t ui32Fsel, uint32_t ui32Div3, uint32_t ui32DivEn, uint32_t ui32TotPer) { uint32_t ui32Denomfinal, ui32ClkFreq; ui32Denomfinal = ((1 << (ui32Fsel - 1)) * (1 + ui32Div3 * 2) * (1 + ui32DivEn * (ui32TotPer))); ui32ClkFreq = (ui32HFRCfreqHz) / ui32Denomfinal; // Compute the set frequency value ui32ClkFreq += (((ui32HFRCfreqHz) % ui32Denomfinal) > (ui32Denomfinal / 2)) ? 1 : 0; return ui32ClkFreq; } //***************************************************************************** // iom_calc_gpio() // // Calculate the IOM4 GPIO to assert. // //***************************************************************************** static uint32_t iom_calc_gpio(uint32_t ui32ChipSelect) { uint32_t index; uint8_t ui8PadRegVal, ui8FncSelVal; // // Figure out which GPIO we are using for the IOM // for ( index = 0; index < (sizeof(g_IOMPads) / sizeof(IOMPad_t)); index++ ) { // // Is this one of the CEn that we are using? // if ( g_IOMPads[index].channel == ui32ChipSelect ) { // // Get the PAD register value // ui8PadRegVal = ((AM_REGVAL(AM_HAL_GPIO_PADREG(g_IOMPads[index].pad))) & AM_HAL_GPIO_PADREG_M(g_IOMPads[index].pad)) >> AM_HAL_GPIO_PADREG_S(g_IOMPads[index].pad); // // Get the FNCSEL field value // ui8FncSelVal = (ui8PadRegVal & 0x38) >> 3; // // Is the FNCSEL filed for this pad set to the expected value? // if ( ui8FncSelVal == g_IOMPads[index].funcsel ) { // This is the GPIO we need to use. return g_IOMPads[index].pad; } } } return 0xDEADBEEF; } //***************************************************************************** // // Checks to see if this processor is a Rev B0 device. // // This is needed for the B0 IOM workaround. // //***************************************************************************** bool isRevB0(void) { // // Check to make sure the major rev is B and the minor rev is zero. // if ( (AM_REG(MCUCTRL, CHIPREV) & 0xFF) == AM_REG_MCUCTRL_CHIPREV_REVMAJ_B ) { return true; } else { return false; } } //***************************************************************************** // //! @brief Returns the proper settings for the CLKCFG register. //! //! @param ui32FreqHz - The desired interface frequency in Hz. //! ui32Phase - SPI phase (0 or 1). Can affect duty cycle. //! //! Given a desired serial interface clock frequency, this function computes //! the appropriate settings for the various fields in the CLKCFG register //! and returns the 32-bit value that should be written to that register. //! The actual interface frequency may be slightly lower than the specified //! frequency, but the actual frequency is also returned. //! //! @note A couple of criteria that this algorithm follow are: //! 1. For power savings, choose the highest FSEL possible. //! 2. For best duty cycle, use DIV3 when possible rather than DIVEN. //! //! An example of #1 is that both of the following CLKCFGs would result //! in a frequency of 428,571 Hz: 0x0E071400 and 0x1C0E1300. //! The former is chosen by the algorithm because it results in FSEL=4 //! while the latter is FSEL=3. //! //! An example of #2 is that both of the following CLKCFGs would result //! in a frequency of 2,000,000 Hz: 0x02011400 and 0x00000C00. //! The latter is chosen by the algorithm because it results in use of DIV3 //! rather than DIVEN. //! //! @return An unsigned 64-bit value. //! The lower 32-bits represent the value to use to set CLKCFG. //! The upper 32-bits represent the actual frequency (in Hz) that will result //! from setting CLKCFG with the lower 32-bits. //! //! 0 (64 bits) = error. Note that the caller must check the entire 64 bits. //! It is not an error if only the low 32-bits are 0 (this is a valid value). //! But the entire 64 bits returning 0 is an error. //! //***************************************************************************** static uint64_t iom_get_interface_clock_cfg(uint32_t ui32FreqHz, uint32_t ui32Phase ) { uint32_t ui32Fsel, ui32Div3, ui32DivEn, ui32TotPer, ui32LowPer; uint32_t ui32Denom, ui32v1, ui32Denomfinal, ui32ClkFreq, ui32ClkCfg; uint32_t ui32HFRCfreqHz; int32_t i32Div, i32N; if ( ui32FreqHz == 0 ) { return 0; } // // Set the HFRC clock frequency. // ui32HFRCfreqHz = AM_HAL_CLKGEN_FREQ_MAX_HZ; // // Compute various parameters used for computing the optimal CLKCFG setting. // i32Div = (ui32HFRCfreqHz / ui32FreqHz) + ((ui32HFRCfreqHz % ui32FreqHz) ? 1 : 0); // Round up (ceiling) // // Compute N (count the number of LS zeros of Div) = ctz(Div) = log2(Div & (-Div)) // i32N = 31 - AM_INSTR_CLZ((i32Div & (-i32Div))); if ( i32N > 6 ) { i32N = 6; } ui32Div3 = ( (ui32FreqHz < (ui32HFRCfreqHz / 16384)) || ( ((ui32FreqHz >= (ui32HFRCfreqHz / 3)) && (ui32FreqHz <= ((ui32HFRCfreqHz / 2) - 1)) ) ) ) ? 1 : 0; ui32Denom = ( 1 << i32N ) * ( 1 + (ui32Div3 * 2) ); ui32TotPer = i32Div / ui32Denom; ui32TotPer += (i32Div % ui32Denom) ? 1 : 0; ui32v1 = 31 - AM_INSTR_CLZ(ui32TotPer); // v1 = log2(TotPer) ui32Fsel = (ui32v1 > 7) ? ui32v1 + i32N - 7 : i32N; ui32Fsel++; if ( ui32Fsel > 7 ) { // // This is an error, can't go that low. // return 0; } if ( ui32v1 > 7 ) { ui32DivEn = ui32TotPer; // Save TotPer for the round up calculation ui32TotPer = ui32TotPer>>(ui32v1-7); ui32TotPer += ((ui32DivEn) % (1 << (ui32v1 - 7))) ? 1 : 0; } ui32DivEn = ( (ui32FreqHz >= (ui32HFRCfreqHz / 4)) || ((1 << (ui32Fsel - 1)) == i32Div) ) ? 0 : 1; if (ui32Phase == 1) { ui32LowPer = (ui32TotPer - 2) / 2; // Longer high phase } else { ui32LowPer = (ui32TotPer - 1) / 2; // Longer low phase } ui32ClkCfg = AM_REG_IOMSTR_CLKCFG_FSEL(ui32Fsel) | AM_REG_IOMSTR_CLKCFG_DIV3(ui32Div3) | AM_REG_IOMSTR_CLKCFG_DIVEN(ui32DivEn) | AM_REG_IOMSTR_CLKCFG_LOWPER(ui32LowPer) | AM_REG_IOMSTR_CLKCFG_TOTPER(ui32TotPer - 1); // // Now, compute the actual frequency, which will be returned. // ui32ClkFreq = compute_freq(ui32HFRCfreqHz, ui32Fsel, ui32Div3, ui32DivEn, ui32TotPer - 1); // // Determine if the actual frequency is a power of 2 (MHz). // if ( (ui32ClkFreq % 250000) == 0 ) { // // If the actual clock frequency is a power of 2 ranging from 250KHz up, // we can simplify the CLKCFG value using DIV3 (which also results in a // better duty cycle). // ui32Denomfinal = ui32ClkFreq / (uint32_t)250000; if ( onebit(ui32Denomfinal) ) { // // These configurations can be simplified by using DIV3. Configs // using DIV3 have a 50% duty cycle, while those from DIVEN will // have a 66/33 duty cycle. // ui32TotPer = ui32LowPer = ui32DivEn = 0; ui32Div3 = 1; // // Now, compute the return values. // ui32ClkFreq = compute_freq(ui32HFRCfreqHz, ui32Fsel, ui32Div3, ui32DivEn, ui32TotPer); ui32ClkCfg = AM_REG_IOMSTR_CLKCFG_FSEL(ui32Fsel) | AM_REG_IOMSTR_CLKCFG_DIV3(1) | AM_REG_IOMSTR_CLKCFG_DIVEN(0) | AM_REG_IOMSTR_CLKCFG_LOWPER(0) | AM_REG_IOMSTR_CLKCFG_TOTPER(0); } } return ( ((uint64_t)ui32ClkFreq) << 32) | (uint64_t)ui32ClkCfg; } //iom_get_interface_clock_cfg() //***************************************************************************** // //! @brief Enable the IOM in the power control block. //! //! This function enables the desigated IOM module in the power control block. //! //! @return None. // //***************************************************************************** void am_hal_iom_pwrctrl_enable(uint32_t ui32Module) { am_hal_debug_assert_msg(ui32Module < AM_REG_IOMSTR_NUM_MODULES, "Trying to enable an IOM module that doesn't exist."); am_hal_pwrctrl_periph_enable(AM_HAL_PWRCTRL_IOM0 << ui32Module); } //***************************************************************************** // //! @brief Disable the IOM in the power control block. //! //! This function disables the desigated IOM module in the power control block. //! //! @return None. // //***************************************************************************** void am_hal_iom_pwrctrl_disable(uint32_t ui32Module) { am_hal_debug_assert_msg(ui32Module < AM_REG_IOMSTR_NUM_MODULES, "Trying to disable an IOM module that doesn't exist."); am_hal_pwrctrl_periph_disable(AM_HAL_PWRCTRL_IOM0 << ui32Module); } //***************************************************************************** // //! @brief Enables the IOM module //! //! @param ui32Module - The number of the IOM module to be enabled. //! //! This function enables the IOM module using the IFCEN bitfield in the //! IOMSTR_CFG register. //! //! @return None. // //***************************************************************************** void am_hal_iom_enable(uint32_t ui32Module) { if ( ui32Module < AM_REG_IOMSTR_NUM_MODULES ) { AM_REGn(IOMSTR, ui32Module, CFG) |= AM_REG_IOMSTR_CFG_IFCEN(1); g_bIomBusy[ui32Module] = false; } } //***************************************************************************** // //! @brief Disables the IOM module. //! //! @param ui32Module - The number of the IOM module to be disabled. //! //! This function disables the IOM module using the IFCEN bitfield in the //! IOMSTR_CFG register. //! //! @return None. // //***************************************************************************** void am_hal_iom_disable(uint32_t ui32Module) { if ( ui32Module < AM_REG_IOMSTR_NUM_MODULES ) { // // Wait until the bus is idle. // am_hal_iom_poll_complete(ui32Module); // // Disable the interface. // AM_REGn(IOMSTR, ui32Module, CFG) &= ~(AM_REG_IOMSTR_CFG_IFCEN(1)); } } //***************************************************************************** // //! @brief Enable power to the selected IOM module. //! //! @param ui32Module - Module number for the IOM to be turned on. //! //! This function enables the power gate to the selected IOM module. It is //! intended to be used along with am_hal_iom_power_off_save(). Used together, //! these functions allow the caller to power IOM modules off to save //! additional power without losing important configuration information. //! //! The am_hal_iom_power_off_save() function will save IOM configuration //! register information to SRAM before powering off the selected IOM module. //! This function will re-enable the IOM module, and restore those //! configuration settings from SRAM. //! //! @return None. // //***************************************************************************** void am_hal_iom_power_on_restore(uint32_t ui32Module) { am_hal_debug_assert_msg(ui32Module < AM_REG_IOMSTR_NUM_MODULES, "Trying to enable an IOM module that doesn't exist."); // // Make sure this restore is a companion to a previous save call. // if ( am_hal_iom_pwrsave[ui32Module].bValid == 0 ) { return; } // // Enable power to the selected IOM. // am_hal_pwrctrl_periph_enable(AM_HAL_PWRCTRL_IOM0 << ui32Module); // // Restore the IOM configuration registers from the structure in SRAM. // AM_REGn(IOMSTR, ui32Module, FIFOTHR) = am_hal_iom_pwrsave[ui32Module].FIFOTHR; AM_REGn(IOMSTR, ui32Module, CLKCFG) = am_hal_iom_pwrsave[ui32Module].CLKCFG; AM_REGn(IOMSTR, ui32Module, CFG) = am_hal_iom_pwrsave[ui32Module].CFG; AM_REGn(IOMSTR, ui32Module, INTEN) = am_hal_iom_pwrsave[ui32Module].INTEN; // // Indicates we have restored the configuration. // am_hal_iom_pwrsave[ui32Module].bValid = 0; } //***************************************************************************** // //! @brief Disable power to the selected IOM module. //! //! @param ui32Module - Module number for the IOM to be turned off. //! //! This function disables the power gate to the selected IOM module. It is //! intended to be used along with am_hal_iom_power_on_restore(). Used together, //! these functions allow the caller to power IOM modules off to save //! additional power without losing important configuration information. //! //! The am_hal_iom_power_off_save() function will save IOM configuration //! register information to SRAM before powering off the selected IOM module. //! The am_hal_iom_power_on_restore() function will re-enable the IOM module //! and restore those configuration settings from SRAM. //! //! @return None. // //***************************************************************************** void am_hal_iom_power_off_save(uint32_t ui32Module) { am_hal_debug_assert_msg(ui32Module < AM_REG_IOMSTR_NUM_MODULES, "Trying to disable an IOM module that doesn't exist."); // // Save the IOM configuration registers to the structure in SRAM. // am_hal_iom_pwrsave[ui32Module].FIFOTHR = AM_REGn(IOMSTR, ui32Module, FIFOTHR); am_hal_iom_pwrsave[ui32Module].CLKCFG = AM_REGn(IOMSTR, ui32Module, CLKCFG); am_hal_iom_pwrsave[ui32Module].CFG = AM_REGn(IOMSTR, ui32Module, CFG); am_hal_iom_pwrsave[ui32Module].INTEN = AM_REGn(IOMSTR, ui32Module, INTEN); // // Indicates we have a valid saved configuration. // am_hal_iom_pwrsave[ui32Module].bValid = 1; // // Disable power to the selected IOM. // am_hal_pwrctrl_periph_disable(AM_HAL_PWRCTRL_IOM0 << ui32Module); } // //! Check and correct the IOM FIFO threshold. // #define MAX_RW_THRESHOLD (AM_HAL_IOM_MAX_FIFO_SIZE - 4) #define MIN_RW_THRESHOLD (4) #if (AM_ASSERT_INVALID_THRESHOLD == 0) static uint8_t check_iom_threshold(const uint8_t iom_threshold) { uint8_t corrected_threshold = iom_threshold; if ( corrected_threshold < MIN_RW_THRESHOLD ) { corrected_threshold = MIN_RW_THRESHOLD; } if ( corrected_threshold > MAX_RW_THRESHOLD ) { corrected_threshold = MAX_RW_THRESHOLD; } return corrected_threshold; } #endif //***************************************************************************** // //! @brief Sets module-wide configuration options for the IOM module. //! //! @param ui32Module - The instance number for the module to be configured //! (zero or one) //! //! @param psConfig - Pointer to an IOM configuration structure. //! //! This function is used to set the interface mode (SPI or I2C), clock //! frequency, SPI format (when relevant), and FIFO read/write interrupt //! thresholds for the IO master. For more information on specific //! configuration options, please see the documentation for the configuration //! structure. //! //! @note The IOM module should be disabled before configuring or //! re-configuring. This function will not re-enable the module when it //! completes. Call the am_hal_iom_enable function when the module is //! configured and ready to use. //! //! @return None. // //***************************************************************************** void am_hal_iom_config(uint32_t ui32Module, const am_hal_iom_config_t *psConfig) { uint32_t ui32Config, ui32ClkCfg; // // Start by checking the interface mode (I2C or SPI), and writing it to the // configuration word. // ui32Config = psConfig->ui32InterfaceMode; if ( ui32Module >= AM_REG_IOMSTR_NUM_MODULES ) { return; } // // Check the SPI format, and OR in the bits for SPHA (clock phase) and SPOL // (polarity). These shouldn't have any effect in I2C mode, so it should be // ok to write them without checking exactly which mode we're in. // if ( psConfig->bSPHA ) { ui32Config |= AM_REG_IOMSTR_CFG_SPHA(1); } if ( psConfig->bSPOL ) { ui32Config |= AM_REG_IOMSTR_CFG_SPOL(1); } // Set the STARTRD based on the interface speed // For all I2C frequencies and SPI frequencies below 16 MHz, the STARTRD // field should be set to 0 to minimize the potential of the IO transfer // holding off a bus access to the FIFO. For SPI frequencies of 16 MHz // or 24 MHz, the STARTRD field must be set to a value of 2 to insure // enough time for the IO preread. if ( psConfig->ui32ClockFrequency >= 16000000UL) { ui32Config |= AM_REG_IOMSTR_CFG_STARTRD(2); } // // Write the resulting configuration word to the IO master CFG register for // the module number we were provided. // AM_REGn(IOMSTR, ui32Module, CFG) = ui32Config; // // Write the FIFO write and read thresholds to the appropriate registers. // #if (AM_ASSERT_INVALID_THRESHOLD == 1) am_hal_debug_assert_msg( (psConfig->ui8WriteThreshold <= MAX_RW_THRESHOLD), "IOM write threshold too big."); am_hal_debug_assert_msg( (psConfig->ui8ReadThreshold <= MAX_RW_THRESHOLD), "IOM read threshold too big."); am_hal_debug_assert_msg( (psConfig->ui8WriteThreshold >= MIN_RW_THRESHOLD), "IOM write threshold too small."); am_hal_debug_assert_msg( (psConfig->ui8ReadThreshold >= MIN_RW_THRESHOLD), "IOM read threshold too small."); AM_REGn(IOMSTR, ui32Module, FIFOTHR) = (AM_REG_IOMSTR_FIFOTHR_FIFOWTHR(psConfig->ui8WriteThreshold) | AM_REG_IOMSTR_FIFOTHR_FIFORTHR(psConfig->ui8ReadThreshold)); #elif (AM_ASSERT_INVALID_THRESHOLD == 0) AM_REGn(IOMSTR, ui32Module, FIFOTHR) = (AM_REG_IOMSTR_FIFOTHR_FIFOWTHR(check_iom_threshold(psConfig->ui8WriteThreshold)) | AM_REG_IOMSTR_FIFOTHR_FIFORTHR(check_iom_threshold(psConfig->ui8ReadThreshold))); #else #error AM_ASSERT_INVALID_THRESHOLD must be 0 or 1. #endif // // An exception occurs in the LOWPER computation when setting an interface // frequency (such as a divide by 5 frequency) which results in a 60/40 // duty cycle. The 60% cycle must occur in the appropriate half-period, // as only one of the half-periods is active, depending on which phase // is being selected. // If SPHA=0 the low period must be 60%. If SPHA=1 high period must be 60%. // Note that the predetermined frequency parameters use the formula // lowper = (totper-1)/2, which results in a 60% low period. // ui32ClkCfg = iom_get_interface_clock_cfg(psConfig->ui32ClockFrequency, psConfig->bSPHA ); if ( ui32ClkCfg ) { AM_REGn(IOMSTR, ui32Module, CLKCFG) = (uint32_t)ui32ClkCfg; } // // Compute the status timeout value. // ui32StatusTimeout[ui32Module] = MAX_IOM_BITS * AM_HAL_IOM_MAX_FIFO_SIZE * IOM_OVERHEAD_FACTOR * (am_hal_clkgen_sysclk_get() / psConfig->ui32ClockFrequency); } //***************************************************************************** // //! @brief Returns the actual currently configured interface frequency in Hz. // //***************************************************************************** uint32_t am_hal_iom_frequency_get(uint32_t ui32ClkCfg) { uint32_t ui32Freq; ui32Freq = compute_freq(AM_HAL_CLKGEN_FREQ_MAX_HZ, (ui32ClkCfg & AM_REG_IOMSTR_CLKCFG_FSEL_M) >> AM_REG_IOMSTR_CLKCFG_FSEL_S, (ui32ClkCfg & AM_REG_IOMSTR_CLKCFG_DIV3_M) >> AM_REG_IOMSTR_CLKCFG_DIV3_S, (ui32ClkCfg & AM_REG_IOMSTR_CLKCFG_DIVEN_M) >> AM_REG_IOMSTR_CLKCFG_DIVEN_S, (ui32ClkCfg & AM_REG_IOMSTR_CLKCFG_TOTPER_M)>> AM_REG_IOMSTR_CLKCFG_TOTPER_S); return ui32Freq; } //***************************************************************************** // // Helper function for the B0 workaround. // //***************************************************************************** static uint32_t iom_get_workaround_fsel(uint32_t maxFreq) { uint32_t ui32Freq, ui32Fsel; uint32_t ui32ClkCfg = AM_REGn(IOMSTR, 4, CLKCFG); // // Starting with the current clock configuration parameters, find a value // of FSEL that will bring our total frequency down to or below maxFreq. // for ( ui32Fsel = 1; ui32Fsel < 8; ui32Fsel++ ) { ui32Freq = compute_freq(AM_HAL_CLKGEN_FREQ_MAX_HZ, ui32Fsel, AM_BFX(IOMSTR, CLKCFG, DIV3, ui32ClkCfg), AM_BFX(IOMSTR, CLKCFG, DIVEN, ui32ClkCfg), AM_BFX(IOMSTR, CLKCFG, TOTPER, ui32ClkCfg)); if ( ui32Freq <= maxFreq && ui32Freq != 0 ) { // // Return the new FSEL // return ui32Fsel; } } // // Couldn't find an appropriate frequency. This should be impossible // because there should always be a value of FSEL that brings the final IOM // frequency below 500 KHz. // am_hal_debug_assert_msg(false, "Could find a valid frequency. Should never get here."); return maxFreq; } // Separating this piece of code in separate function to keep the impact of // rest of the code to mimimal because of stack usage static void internal_iom_workaround_critical(uint32_t ui32Command, volatile uint32_t *pui32CSPadreg, uint32_t ui32CSPadregVal, uint32_t ui32DelayTime, uint32_t ui32ClkCfg, uint32_t ui32LowClkCfg, bool bRising) { uint32_t ui32Critical = 0; // // Start a critical section. // ui32Critical = am_hal_interrupt_master_disable(); // // Start the write on the bus. // AM_REGn(IOMSTR, WORKAROUND_IOM, CMD) = ui32Command; // // Slow down the clock, and run the workaround loop. The workaround // loop runs an edge-detector on MOSI, and triggers a falling edge on // chip-enable on the first bit of our real data. // ((void (*)(uint32_t)) 0x0800009d)(ui32DelayTime); // Switch to Low Freq AM_REGn(IOMSTR, WORKAROUND_IOM, CLKCFG) = ui32LowClkCfg; iom_workaround_loop(ui32CSPadregVal, pui32CSPadreg, bRising); // // Restore the clock frequency and the normal MOSI pin function. // AM_REGn(IOMSTR, WORKAROUND_IOM, CLKCFG) = ui32ClkCfg; am_hal_gpio_pin_config(WORKAROUND_IOM_MOSI_PIN, WORKAROUND_IOM_MOSI_CFG); // // End the critical section. // am_hal_interrupt_master_set(ui32Critical); } //***************************************************************************** // //! @brief Workaround for an Apollo2 Rev B0 issue. //! //! @param ui32ChipSelect - Chip-select number for this transaction. //! @param pui32Data - Pointer to the bytes that will be sent. //! @param ui32NumBytes - Number of bytes to send. //! @param ui32Options - Additional SPI transfer options. //! //! Some Apollo2 Rev B0 devices have an issue where the first byte of a SPI //! write transaction can have some of its bits changed from ones to zeroes. In //! order to get around this issue, we artificially pad the SPI write data with //! additional bytes, and manually control the CS pin for the beginning of the //! SPI frame so that the receiving device will ignore the bytes of padding //! that we added. //! //! This function acts as a helper function to higher-level spi APIs. It //! performs the functions of am_hal_iom_fifo_write() and //! am_hal_iom_spi_cmd_run() to get a SPI write started on the bus, including //! all of the necessary workaround behavior. //! //! @return None. // //***************************************************************************** void am_hal_iom_workaround_word_write(uint32_t ui32ChipSelect, uint32_t *pui32Data, uint32_t ui32NumBytes, uint32_t ui32Options) { uint32_t ui32TransferSize; uint32_t ui32IOMGPIO = 0xDEADBEEF; volatile uint32_t *pui32CSPadreg = 0; uint32_t ui32CSPadregVal = 0; uint32_t ui32ClkCfg = 0; uint32_t ui32HiClkCfg, ui32LowClkCfg; bool bRising = 0; uint32_t ui32HiFreq = 0, ui32NormalFreq = 0; uint32_t ui32DelayTime = 0; uint32_t ui32LowFsel = 0; uint32_t ui32HiFsel = 0; uint32_t ui32FirstWord = 0; uint32_t ui32MaxFifoSize = ((0 == AM_BFRn(IOMSTR, WORKAROUND_IOM, CFG, FULLDUP)) ? AM_HAL_IOM_MAX_FIFO_SIZE : AM_HAL_IOM_MAX_FIFO_SIZE / 2); uint32_t ui32Command; // // Make sure the transfer isn't too long for the hardware to support. // // Note: This is a little shorter than usual, since the workaround // consumes an extra byte at the beginning of the transfer. // am_hal_debug_assert_msg(ui32NumBytes <= 4091, "SPI transfer too big."); // // Create a "dummy" word to add on to the beginning of the transfer // that will guarantee a transition between the first word and the // second on the bus. // // For raw transactions, this is straightforward. For transactions // preceded by an offset, we'll add the offset in to the "dummy" word // to preserve data alignment later. // // The workaround uses a critical section for precision // To minimize the time in critical section, we raise the SPI frequency // to the max possible for the initial preamble to be clocked out // then we switch to a 'reasonably' slow frequency to be able to reliably // catch the rising or falling edge by polling. Then we switch back to // configured frequency // // We want to slow down the clock to help us count edges more // accurately. Save it first, then slow it down. Also, we will // pre-calculate a delay for when we need to restore the SPI settings. // ui32ClkCfg = AM_REGn(IOMSTR, WORKAROUND_IOM, CLKCFG); // Get the largest speed we can configure within our rated speed of 16MHz ui32HiFsel = iom_get_workaround_fsel(16000000); ui32HiClkCfg = ((ui32ClkCfg & (~AM_REG_IOMSTR_CLKCFG_FSEL_M)) | AM_BFV(IOMSTR, CLKCFG, FSEL, ui32HiFsel)); // Switch to Hi Freq // Need to make sure we wait long enough for the hi clock to be effective // Delay 2 cycles based on previous frequency ui32NormalFreq = am_hal_iom_frequency_get(ui32ClkCfg); AM_REGn(IOMSTR, WORKAROUND_IOM, CLKCFG) = ui32HiClkCfg; ui32DelayTime = ((2 * AM_HAL_CLKGEN_FREQ_MAX_HZ) / (ui32NormalFreq * 3)); ((void (*)(uint32_t)) 0x0800009d)(ui32DelayTime); // // Remember what frequency we'll be running at.during Hi Phase // ui32HiFreq = am_hal_iom_frequency_get(ui32HiClkCfg); // // Validate return value to prevent DIVBY0 errors. // am_hal_debug_assert_msg(ui32HiFreq > 0, "Invalid Hi Frequency for IOM."); // Get a reasonably slow speed (~1MHz) we can safely poll for the transition ui32LowFsel = iom_get_workaround_fsel(1000000); ui32LowClkCfg = ((ui32ClkCfg & (~AM_REG_IOMSTR_CLKCFG_FSEL_M)) | AM_BFV(IOMSTR, CLKCFG, FSEL, ui32LowFsel)); if ( ui32Options & AM_HAL_IOM_RAW ) { // // The transition we care for is on 33rd bit. // Prepare to delay 27 bits past the start of the transaction // before getting into polling - to leave some // margin for compiler related variations // ui32DelayTime = ((27 * AM_HAL_CLKGEN_FREQ_MAX_HZ) / (ui32HiFreq * 3)); if ( pui32Data[0] & 0x80 ) { ui32FirstWord = 0x00000000; bRising = true; } else { ui32FirstWord = 0xFFFFFF00; bRising = false; } } else { // // The transition we care for is on 25th bit. // Prepare to delay 19 bits past the start of the transaction // before getting into polling - to leave some // margin for compiler related variations // ui32DelayTime = ((19 * AM_HAL_CLKGEN_FREQ_MAX_HZ) / (ui32HiFreq * 3)); ui32FirstWord = ((ui32Options & 0xFF00) << 16); if ( ui32FirstWord & 0x80000000 ) { bRising = true; } else { ui32FirstWord |= 0x00FFFF00; bRising = false; } } // // Now that weve taken care of the offset byte, we can run the // transaction in RAW mode. // ui32Options |= AM_HAL_IOM_RAW; ui32NumBytes += 4; // // Figure out how many bytes we can write to the FIFO immediately. // ui32TransferSize = (ui32NumBytes <= ui32MaxFifoSize ? ui32NumBytes : ui32MaxFifoSize); am_hal_iom_fifo_write(WORKAROUND_IOM, &ui32FirstWord, 4); am_hal_iom_fifo_write(WORKAROUND_IOM, pui32Data, ui32TransferSize - 4); // // Calculate the GPIO to be controlled until the initial shift is // complete. Make sure we get a valid value. // ui32IOMGPIO = iom_calc_gpio(ui32ChipSelect); am_hal_debug_assert(0xDEADBEEF != ui32IOMGPIO); // // Save the locations and values of the CS pin configuration // information. // pui32CSPadreg = (volatile uint32_t *)AM_HAL_GPIO_PADREG(ui32IOMGPIO); ui32CSPadregVal = *pui32CSPadreg; // // Switch CS to a GPIO. // am_hal_gpio_out_bit_set(ui32IOMGPIO); am_hal_gpio_pin_config(ui32IOMGPIO, AM_HAL_GPIO_OUTPUT); // // Enable the input buffer on MOSI. // am_hal_gpio_pin_config(WORKAROUND_IOM_MOSI_PIN, WORKAROUND_IOM_MOSI_CFG | AM_HAL_PIN_DIR_INPUT); // // Write the GPIO PADKEY register to allow the workaround loop to // reconfigure chip enable. // AM_REGn(GPIO, 0, PADKEY) = AM_REG_GPIO_PADKEY_KEYVAL; // Preconstruct the command - to save on calculations inside critical section ui32Command = internal_am_hal_iom_spi_cmd_construct(AM_HAL_IOM_WRITE, ui32ChipSelect, ui32NumBytes, ui32Options); internal_iom_workaround_critical(ui32Command, pui32CSPadreg, ui32CSPadregVal, ui32DelayTime, ui32ClkCfg, ui32LowClkCfg, bRising); // // Update the pointer and data counter. // ui32NumBytes -= ui32TransferSize; pui32Data += (ui32TransferSize - 4) >> 2; } //***************************************************************************** // //! @brief Implement an iterative spin loop. //! //! @param ui32Iterations - Number of iterations to delay. //! //! Use this function to implement a CPU busy waiting spin. For Apollo, this //! delay can be used for timing purposes since for Apollo, each iteration will //! take 3 cycles. //! //! @return None. // //***************************************************************************** #if defined(__GNUC__) static void __attribute__((naked)) iom_workaround_loop(uint32_t ui32PadRegVal, volatile uint32_t *pui32PadReg, bool bRising) { // // Check to see if this is a "rising edge" or "falling edge" detector. // __asm(" cbz r2, falling_edge"); // // Read GPIO pin 44, and loop until it's HIGH. // __asm("rising_edge:"); __asm(" ldr r2, =0x40010084"); __asm("rising_check_mosi:"); __asm(" ldr r3, [r2]"); __asm(" ands r3, r3, #0x1000"); __asm(" beq rising_check_mosi"); // // Write the PADREG Value to the PADREG register. // __asm(" str r0, [r1]"); __asm(" bx lr"); // // Read GPIO pin 44, and loop until it's LOW. // __asm("falling_edge:"); __asm(" ldr r2, =0x40010084"); __asm("falling_check_mosi:"); __asm(" ldr r3, [r2]"); __asm(" ands r3, r3, #0x1000"); __asm(" bne falling_check_mosi"); // // Write the PADREG Value to the PADREG register. // __asm(" str r0, [r1]"); __asm(" bx lr"); } #elif defined(__CC_ARM) __asm static void iom_workaround_loop(uint32_t ui32PadRegVal, volatile uint32_t *pui32PadReg, bool bRising) { // // Check to see if this is a "rising edge" or "falling edge" detector. // cbz r2, falling_edge // // Read GPIO pin 44, and loop until it's HIGH. // rising_edge ldr r2, =0x40010084 rising_check_mosi ldr r3, [r2] ands r3, r3, #0x1000 beq rising_check_mosi // // Write the PADREG Value to the PADREG register. // str r0, [r1] bx lr // // Read GPIO pin 44, and loop until it's LOW. // falling_edge ldr r2, =0x40010084 falling_check_mosi ldr r3, [r2] ands r3, r3, #0x1000 bne falling_check_mosi // // Write the PADREG Value to the PADREG register. // str r0, [r1] bx lr nop } #elif defined(__ICCARM__) static void iom_workaround_loop(uint32_t ui32PadRegVal, volatile uint32_t *pui32PadReg, bool bRising) { // // Check to see if this is a "rising edge" or "falling edge" detector. // asm( " cbz r2, falling_edge\n" // // Read GPIO pin 44, and loop until it's HIGH. // "rising_edge:\n" " mov32 r2, #0x40010084\n" "rising_check_mosi:\n" " ldr r3, [r2]\n" " ands r3, r3, #0x1000\n" " beq rising_check_mosi\n" // // Write the PADREG Value to the PADREG register. // " str r0, [r1]\n" " bx lr\n" // // Read GPIO pin 44, and loop until it's LOW. // "falling_edge:\n" " mov32 r2, #0x40010084\n" "falling_check_mosi:\n" " ldr r3, [r2]\n" " ands r3, r3, #0x1000\n" " bne falling_check_mosi\n" // // Write the PADREG Value to the PADREG register. // " str r0, [r1]\n" " bx lr" ); } #endif //***************************************************************************** // //! @brief Perform a simple write to the SPI interface. //! //! @param ui32Module - Module number for the IOM //! @param ui32ChipSelect - Chip-select number for this transaction. //! @param pui32Data - Pointer to the bytes that will be sent. //! @param ui32NumBytes - Number of bytes to send. //! @param ui32Options - Additional SPI transfer options. //! //! This function performs SPI writes to a selected SPI device. //! //! @note The actual SPI and I2C interfaces operate in BYTES, not 32-bit words. //! This means that you will need to byte-pack the \e pui32Data array with the //! data you intend to send over the interface. One easy way to do this is to //! declare the array as a 32-bit integer array, but use an 8-bit pointer to //! put your actual data into the array. If there are not enough bytes in your //! desired message to completely fill the last 32-bit word, you may pad that //! last word with bytes of any value. The IOM hardware will only read the //! first \e ui32NumBytes in the \e pui8Data array. //! //! @return None. // //***************************************************************************** void am_hal_iom_spi_write(uint32_t ui32Module, uint32_t ui32ChipSelect, uint32_t *pui32Data, uint32_t ui32NumBytes, uint32_t ui32Options) { // // Validate parameters // am_hal_debug_assert_msg(ui32Module < AM_REG_IOMSTR_NUM_MODULES, "Trying to use an IOM module that doesn't exist."); am_hal_debug_assert_msg(ui32NumBytes > 0, "Trying to do a 0 byte transaction"); // // Check to see if queues have been enabled. If they are, we'll actually // switch to the queued interface. // if ( g_psIOMQueue[ui32Module].pui8Data != NULL ) { // // If the queue is on, go ahead and add this transaction to the queue. // am_hal_iom_queue_spi_write(ui32Module, ui32ChipSelect, pui32Data, ui32NumBytes, ui32Options, 0); // // Wait until the transaction actually clears. // am_hal_iom_queue_flush(ui32Module); // // At this point, we've completed the transaction, and we can return. // return; } else { // // Otherwise, we'll just do a polled transaction. // am_hal_iom_spi_write_nq(ui32Module, ui32ChipSelect, pui32Data, ui32NumBytes, ui32Options); } } //***************************************************************************** // //! @brief Perform simple SPI read operations. //! //! @param ui32Module - Module number for the IOM //! @param ui32ChipSelect - Chip-select number for this transaction. //! @param pui32Data - Pointer to the array where received bytes should go. //! @param ui32NumBytes - Number of bytes to read. //! @param ui32Options - Additional SPI transfer options. //! //! This function performs simple SPI read operations. The caller is //! responsible for ensuring that the receive buffer is large enough to hold //! the requested amount of data. //! //! @note The actual SPI and I2C interfaces operate in BYTES, not 32-bit words. //! This function will pack the individual bytes from the physical interface //! into 32-bit words, which are then placed into the \e pui32Data array. Only //! the first \e ui32NumBytes bytes in this array will contain valid data. //! //! @return None. // //***************************************************************************** void am_hal_iom_spi_read(uint32_t ui32Module, uint32_t ui32ChipSelect, uint32_t *pui32Data, uint32_t ui32NumBytes, uint32_t ui32Options) { // // Validate parameters // am_hal_debug_assert_msg(ui32Module < AM_REG_IOMSTR_NUM_MODULES, "Trying to use an IOM module that doesn't exist."); am_hal_debug_assert_msg(ui32NumBytes > 0, "Trying to do a 0 byte transaction"); // // Make sure the transfer isn't too long for the hardware to support. // am_hal_debug_assert_msg(ui32NumBytes < 4096, "SPI transfer too big."); // // Check to see if queues have been enabled. If they are, we'll actually // switch to the queued interface. // if ( g_psIOMQueue[ui32Module].pui8Data != NULL ) { // // If the queue is on, go ahead and add this transaction to the queue. // am_hal_iom_queue_spi_read(ui32Module, ui32ChipSelect, pui32Data, ui32NumBytes, ui32Options, 0); // // Wait until the transaction actually clears. // am_hal_iom_queue_flush(ui32Module); // // At this point, we've completed the transaction, and we can return. // return; } else { // // Otherwise, just perform a polled transaction. // am_hal_iom_spi_read_nq(ui32Module, ui32ChipSelect, pui32Data, ui32NumBytes, ui32Options); } } //***************************************************************************** // //! @brief Perform a simple write to the SPI interface (without queuing) //! //! @param ui32Module - Module number for the IOM //! @param ui32ChipSelect - Chip-select number for this transaction. //! @param pui32Data - Pointer to the bytes that will be sent. //! @param ui32NumBytes - Number of bytes to send. //! @param ui32Options - Additional SPI transfer options. //! //! This function performs SPI writes to a selected SPI device. //! //! @note The actual SPI and I2C interfaces operate in BYTES, not 32-bit words. //! This means that you will need to byte-pack the \e pui32Data array with the //! data you intend to send over the interface. One easy way to do this is to //! declare the array as a 32-bit integer array, but use an 8-bit pointer to //! put your actual data into the array. If there are not enough bytes in your //! desired message to completely fill the last 32-bit word, you may pad that //! last word with bytes of any value. The IOM hardware will only read the //! first \e ui32NumBytes in the \e pui8Data array. //! //! @return None. // //***************************************************************************** uint32_t am_hal_iom_spi_write_nq(uint32_t ui32Module, uint32_t ui32ChipSelect, uint32_t *pui32Data, uint32_t ui32NumBytes, uint32_t ui32Options) { uint32_t ui32TransferSize; uint32_t ui32SpaceInFifo; uint32_t ui32IntConfig; uint32_t ui32MaxFifoSize; uint32_t ui32Status = 1; // // Validate parameters // am_hal_debug_assert_msg(ui32Module < AM_REG_IOMSTR_NUM_MODULES, "Trying to use an IOM module that doesn't exist."); am_hal_debug_assert_msg(ui32NumBytes > 0, "Trying to do a 0 byte transaction"); // // Make sure the transfer isn't too long for the hardware to support. // am_hal_debug_assert_msg(ui32NumBytes < 4096, "SPI transfer too big."); ui32MaxFifoSize = ((0 == AM_BFRn(IOMSTR, ui32Module, CFG, FULLDUP)) ? AM_HAL_IOM_MAX_FIFO_SIZE : AM_HAL_IOM_MAX_FIFO_SIZE / 2); // // Wait until any earlier transactions have completed. // am_hal_iom_poll_complete(ui32Module); // // Disable interrupts so that we don't get any undesired interrupts. // ui32IntConfig = AM_REGn(IOMSTR, ui32Module, INTEN); AM_REGn(IOMSTR, ui32Module, INTEN) = 0; // Clear CMDCMP status AM_BFWn(IOMSTR, ui32Module, INTCLR, CMDCMP, 1); // // If we're on a B0 part, and we're using IOM4, our first byte coule be // corrupted, so we need to send a dummy word with chip-select held high to // get that first byte out of the way. // // That operation is tricky and detailed, so we'll call a function to do it // for us. // if ( WORKAROUND_IOM == ui32Module && isRevB0() ) { am_hal_iom_workaround_word_write(ui32ChipSelect, pui32Data, ui32NumBytes, ui32Options); // // The workaround function is going to a partial transfer for us, but // we have to keep our own data-tracking variables updated. Here, we're // subtracting 4 bytes from the effective transfer size to account for // the 4 bytes of "dummy" word that we sent instead of the actual data. // ui32TransferSize = (ui32NumBytes <= (ui32MaxFifoSize - 4) ? ui32NumBytes : (ui32MaxFifoSize - 4)); } else { // // Figure out how many bytes we can write to the FIFO immediately. // ui32TransferSize = (ui32NumBytes <= ui32MaxFifoSize ? ui32NumBytes : ui32MaxFifoSize); // // write our first word to the fifo. // am_hal_iom_fifo_write(ui32Module, pui32Data, ui32TransferSize); // // Start the write on the bus. // am_hal_iom_spi_cmd_run(AM_HAL_IOM_WRITE, ui32Module, ui32ChipSelect, ui32NumBytes, ui32Options); } // // Update the pointer and data counter. // ui32NumBytes -= ui32TransferSize; pui32Data += ui32TransferSize >> 2; // // Keep looping until we're out of bytes to send or command complete (error). // while ( ui32NumBytes && !AM_BFRn(IOMSTR, ui32Module, INTSTAT, CMDCMP) ) { // // This will always return a multiple of four. // ui32SpaceInFifo = am_hal_iom_fifo_empty_slots(ui32Module); if ( ui32NumBytes <= ui32SpaceInFifo ) { // // If the entire message will fit in the fifo, prepare to copy // everything. // ui32TransferSize = ui32NumBytes; } else { // // If only a portion of the message will fit in the fifo, prepare // to copy the largest number of 4-byte blocks possible. // ui32TransferSize = ui32SpaceInFifo & ~(0x3); } // // Write this chunk to the fifo. // am_hal_iom_fifo_write(ui32Module, pui32Data, ui32TransferSize); // // Update the data pointer and bytes-left count. // ui32NumBytes -= ui32TransferSize; pui32Data += ui32TransferSize >> 2; } // // Make sure CMDCMP was raised with standard timeout // ui32Status = am_util_wait_status_change(ui32StatusTimeout[ui32Module], AM_REG_IOMSTRn(ui32Module) + AM_REG_IOMSTR_INTSTAT_O, AM_REG_IOMSTR_INTEN_CMDCMP_M, AM_REG_IOMSTR_INTEN_CMDCMP_M); // // Re-enable IOM interrupts. Make sure CMDCMP is cleared // AM_REGn(IOMSTR, ui32Module, INTCLR) = (ui32IntConfig | AM_REG_IOMSTR_INTSTAT_CMDCMP_M); AM_REGn(IOMSTR, ui32Module, INTEN) = ui32IntConfig; am_hal_debug_assert_msg(ui32Status == 1,"IOM CMDCMP was not seen"); // // Return the status (0 = timeout; 1 = success) // return ui32Status; } //***************************************************************************** // //! @brief Perform simple SPI read operations (without queuing). //! //! @param ui32Module - Module number for the IOM //! @param ui32ChipSelect - Chip-select number for this transaction. //! @param pui32Data - Pointer to the array where received bytes should go. //! @param ui32NumBytes - Number of bytes to read. //! @param ui32Options - Additional SPI transfer options. //! //! This function performs simple SPI read operations. The caller is //! responsible for ensuring that the receive buffer is large enough to hold //! the requested amount of data. //! //! @note The actual SPI and I2C interfaces operate in BYTES, not 32-bit words. //! This function will pack the individual bytes from the physical interface //! into 32-bit words, which are then placed into the \e pui32Data array. Only //! the first \e ui32NumBytes bytes in this array will contain valid data. //! //! @return None. // //***************************************************************************** uint32_t am_hal_iom_spi_read_nq(uint32_t ui32Module, uint32_t ui32ChipSelect, uint32_t *pui32Data, uint32_t ui32NumBytes, uint32_t ui32Options) { uint32_t ui32BytesInFifo; uint32_t ui32IntConfig; uint32_t bCmdCmp = false; uint32_t ui32Status = 1; // // Validate parameters // am_hal_debug_assert_msg(ui32Module < AM_REG_IOMSTR_NUM_MODULES, "Trying to use an IOM module that doesn't exist."); am_hal_debug_assert_msg(ui32NumBytes > 0, "Trying to do a 0 byte transaction"); // // Make sure the transfer isn't too long for the hardware to support. // am_hal_debug_assert_msg(ui32NumBytes < 4096, "SPI transfer too big."); // // Wait until the bus is idle, then start the requested READ transfer on // the physical interface. // am_hal_iom_poll_complete(ui32Module); // // Disable interrupts so that we don't get any undesired interrupts. // ui32IntConfig = AM_REGn(IOMSTR, ui32Module, INTEN); // // Disable IOM interrupts as we'll be polling // AM_REGn(IOMSTR, ui32Module, INTEN) = 0; // // Clear CMDCMP status // AM_BFWn(IOMSTR, ui32Module, INTCLR, CMDCMP, 1); // // If we're on a B0 part, and we're using IOM4, our first byte coule be // corrupted, so we need to send a dummy word with chip-select held high to // get that first byte out of the way. This is only true for spi reads with // OFFSET values. // // That operation is tricky and detailed, so we'll call a function to do it // for us. // if ( (WORKAROUND_IOM == ui32Module) && !(ui32Options & AM_HAL_IOM_RAW) && isRevB0() ) { am_hal_iom_workaround_word_write(ui32ChipSelect, pui32Data, 0, ui32Options | AM_HAL_IOM_CS_LOW); // // The workaround will send our offset for us, so we can run a RAW // command after. // ui32Options |= AM_HAL_IOM_RAW; // // Wait for the dummy word to go out over the bus. // // Make sure the command complete has also been raised ui32Status = am_util_wait_status_change(ui32StatusTimeout[ui32Module], AM_REG_IOMSTRn(ui32Module) + AM_REG_IOMSTR_INTSTAT_O, AM_REG_IOMSTR_INTEN_CMDCMP_M, AM_REG_IOMSTR_INTEN_CMDCMP_M); // Clear CMDCMP status AM_BFWn(IOMSTR, ui32Module, INTCLR, CMDCMP, 1); } am_hal_iom_spi_cmd_run(AM_HAL_IOM_READ, ui32Module, ui32ChipSelect, ui32NumBytes, ui32Options); // // Start a loop to catch the Rx data. // while ( ui32NumBytes ) { ui32BytesInFifo = am_hal_iom_fifo_full_slots(ui32Module); if ( ui32BytesInFifo >= ui32NumBytes ) { // // If the fifo contains our entire message, just copy the whole // thing out. // am_hal_iom_fifo_read(ui32Module, pui32Data, ui32NumBytes); ui32NumBytes = 0; } else if ( ui32BytesInFifo >= 4 ) { // // If the fifo has at least one 32-bit word in it, copy whole // words out. // am_hal_iom_fifo_read(ui32Module, pui32Data, ui32BytesInFifo & ~0x3); ui32NumBytes -= ui32BytesInFifo & ~0x3; pui32Data += ui32BytesInFifo >> 2; } if ( bCmdCmp == true ) { // // No more data expected. Get out of the loop // break; } bCmdCmp = AM_BFRn(IOMSTR, ui32Module, INTSTAT, CMDCMP); } // // Make sure CMDCMP was raised, // ui32Status = am_util_wait_status_change(ui32StatusTimeout[ui32Module], AM_REG_IOMSTRn(ui32Module) + AM_REG_IOMSTR_INTSTAT_O, AM_REG_IOMSTR_INTEN_CMDCMP_M, AM_REG_IOMSTR_INTEN_CMDCMP_M); // // Re-enable IOM interrupts. Make sure CMDCMP is cleared // AM_REGn(IOMSTR, ui32Module, INTCLR) = (ui32IntConfig | AM_REG_IOMSTR_INTSTAT_CMDCMP_M); AM_REGn(IOMSTR, ui32Module, INTEN) = ui32IntConfig; am_hal_debug_assert_msg(ui32Status == 1,"IOM CMDCMP was not seen"); // // Return the status (0 = timeout; 1 = success) // return ui32Status; } //***************************************************************************** // //! @brief Perform a non-blocking write to the SPI interface. //! //! @param ui32Module - Module number for the IOM //! @param ui32ChipSelect - Chip-select number for this transaction. //! @param pui32Data - Pointer to the bytes that will be sent. //! @param ui32NumBytes - Number of bytes to send. //! @param ui32Options - Additional SPI transfer options. //! @param pfnCallback - Function to call when the transaction completes. //! //! This function performs SPI writes to the selected SPI device. //! //! This function call is a non-blocking implementation. It will write as much //! data to the FIFO as possible immediately, store a pointer to the remaining //! data, start the transfer on the bus, and then immediately return. The //! caller will need to make sure that \e am_hal_iom_int_service() is called //! for IOM FIFO interrupt events and "command complete" interrupt events. The //! \e am_hal_iom_int_service() function will refill the FIFO as necessary and //! call the \e pfnCallback function when the transaction is finished. //! //! @note The actual SPI and I2C interfaces operate in BYTES, not 32-bit words. //! This means that you will need to byte-pack the \e pui32Data array with the //! data you intend to send over the interface. One easy way to do this is to //! declare the array as a 32-bit integer array, but use an 8-bit pointer to //! put your actual data into the array. If there are not enough bytes in your //! desired message to completely fill the last 32-bit word, you may pad that //! last word with bytes of any value. The IOM hardware will only read the //! first \e ui32NumBytes in the \e pui8Data array. //! //! @return None. // //***************************************************************************** void am_hal_iom_spi_write_nb(uint32_t ui32Module, uint32_t ui32ChipSelect, uint32_t *pui32Data, uint32_t ui32NumBytes, uint32_t ui32Options, am_hal_iom_callback_t pfnCallback) { uint32_t ui32TransferSize; uint32_t ui32MaxFifoSize; // // Validate parameters // if ( ui32Module >= AM_REG_IOMSTR_NUM_MODULES ) { return; } // // Make sure the transfer isn't too long for the hardware to support. // am_hal_debug_assert_msg(ui32NumBytes < 4096, "SPI transfer too big."); am_hal_debug_assert_msg(ui32NumBytes > 0, "Trying to do a 0 byte transaction"); ui32MaxFifoSize = ((0 == AM_BFRn(IOMSTR, ui32Module, CFG, FULLDUP)) ? AM_HAL_IOM_MAX_FIFO_SIZE : AM_HAL_IOM_MAX_FIFO_SIZE / 2); // // Wait until the bus is idle // am_hal_iom_poll_complete(ui32Module); // // Need to mark IOM busy to avoid another transaction to be scheduled. // This is to take care of a race condition in Queue mode, where the IDLE // set is not a guarantee that the CMDCMP has been received // g_bIomBusy[ui32Module] = true; // // Clear CMDCMP status // AM_BFWn(IOMSTR, ui32Module, INTCLR, CMDCMP, 1); // // Check to see if we need to do the workaround. // if ( WORKAROUND_IOM == ui32Module && isRevB0() ) { // // Figure out how many bytes we can write to the FIFO immediately, // accounting for the extra word from the workaround. // ui32TransferSize = (ui32NumBytes <= (ui32MaxFifoSize - 4) ? ui32NumBytes : (ui32MaxFifoSize - 4)); // // Prepare the global IOM buffer structure. // g_psIOMBuffers[ui32Module].ui32State = BUFFER_SENDING; g_psIOMBuffers[ui32Module].pui32Data = pui32Data + (ui32TransferSize / 4); g_psIOMBuffers[ui32Module].ui32BytesLeft = ui32NumBytes - ui32TransferSize; g_psIOMBuffers[ui32Module].pfnCallback = pfnCallback; g_psIOMBuffers[ui32Module].ui32Options = ui32Options; // // Start the write on the bus using the workaround. This includes both // the command write and the first fifo write, so we won't need to do // either of those things manually. // am_hal_iom_workaround_word_write(ui32ChipSelect, pui32Data, ui32NumBytes, ui32Options); } else { // // Figure out how many bytes we can write to the FIFO immediately. // ui32TransferSize = (ui32NumBytes <= ui32MaxFifoSize ? ui32NumBytes : ui32MaxFifoSize); if ( am_hal_iom_fifo_write(ui32Module, pui32Data, ui32TransferSize) > 0 ) { // // Prepare the global IOM buffer structure. // g_psIOMBuffers[ui32Module].ui32State = BUFFER_SENDING; g_psIOMBuffers[ui32Module].pui32Data = pui32Data; g_psIOMBuffers[ui32Module].ui32BytesLeft = ui32NumBytes; g_psIOMBuffers[ui32Module].pfnCallback = pfnCallback; g_psIOMBuffers[ui32Module].ui32Options = ui32Options; // // Update the pointer and the byte counter based on the portion of // the transfer we just sent to the fifo. // g_psIOMBuffers[ui32Module].ui32BytesLeft -= ui32TransferSize; g_psIOMBuffers[ui32Module].pui32Data += (ui32TransferSize / 4); // // Start the write on the bus. // am_hal_iom_spi_cmd_run(AM_HAL_IOM_WRITE, ui32Module, ui32ChipSelect, ui32NumBytes, ui32Options); } } } //***************************************************************************** // //! @brief Perform a non-blocking SPI read. //! //! @param ui32Module - Module number for the IOM. //! @param ui32ChipSelect - Chip select number of the target device. //! @param pui32Data - Pointer to the array where received bytes should go. //! @param ui32NumBytes - Number of bytes to read. //! @param ui32Options - Additional SPI transfer options. //! @param pfnCallback - Function to call when the transaction completes. //! //! This function performs SPI reads to a selected SPI device. //! //! This function call is a non-blocking implementation. It will start the SPI //! transaction on the bus and store a pointer for the destination for the read //! data, but it will not wait for the SPI transaction to finish. The caller //! will need to make sure that \e am_hal_iom_int_service() is called for IOM //! FIFO interrupt events and "command complete" interrupt events. The \e //! am_hal_iom_int_service() function will empty the FIFO as necessary, //! transfer the data to the \e pui32Data buffer, and call the \e pfnCallback //! function when the transaction is finished. //! //! @note The actual SPI and I2C interfaces operate in BYTES, not 32-bit words. //! This function will pack the individual bytes from the physical interface //! into 32-bit words, which are then placed into the \e pui32Data array. Only //! the first \e ui32NumBytes bytes in this array will contain valid data. //! //! @return None. // //***************************************************************************** uint32_t am_hal_iom_spi_read_nb(uint32_t ui32Module, uint32_t ui32ChipSelect, uint32_t *pui32Data, uint32_t ui32NumBytes, uint32_t ui32Options, am_hal_iom_callback_t pfnCallback) { uint32_t ui32IntConfig; uint32_t ui32Status = 1; // // Validate parameters // am_hal_debug_assert_msg(ui32Module < AM_REG_IOMSTR_NUM_MODULES, "Trying to use an IOM module that doesn't exist."); am_hal_debug_assert_msg(ui32NumBytes > 0, "Trying to do a 0 byte transaction"); // // Make sure the transfer isn't too long for the hardware to support. // am_hal_debug_assert_msg(ui32NumBytes < 4096, "SPI transfer too big."); // // Wait until the bus is idle // am_hal_iom_poll_complete(ui32Module); // // Need to mark IOM busy to avoid another transaction to be scheduled. // This is to take care of a race condition in Queue mode, where the IDLE // set is not a guarantee that the CMDCMP has been received // g_bIomBusy[ui32Module] = true; // // Clear CMDCMP status // AM_BFWn(IOMSTR, ui32Module, INTCLR, CMDCMP, 1); // // If we're on a B0 part, and we're using IOM4, our first byte coule be // corrupted, so we need to send a dummy word with chip-select held high to // get that first byte out of the way. This is only true for spi reads with // OFFSET values. // // That operation is tricky and detailed, so we'll call a function to do it // for us. // if ( (WORKAROUND_IOM == ui32Module) && !(ui32Options & AM_HAL_IOM_RAW) && isRevB0() ) { // // We might mess up the interrupt handler behavior if we allow this // polled transaction to complete with interrupts enabled. We'll // briefly turn them off here. // ui32IntConfig = AM_REGn(IOMSTR, 4, INTEN); AM_REGn(IOMSTR, 4, INTEN) = 0; am_hal_iom_workaround_word_write(ui32ChipSelect, pui32Data, 0, ui32Options | AM_HAL_IOM_CS_LOW); // // The workaround will send our offset for us, so we can run a RAW // command after. // ui32Options |= AM_HAL_IOM_RAW; // // Wait for the dummy word to go out over the bus. // // Make sure the command complete has also been raised ui32Status = am_util_wait_status_change(ui32StatusTimeout[ui32Module], AM_REG_IOMSTRn(ui32Module) + AM_REG_IOMSTR_INTSTAT_O, AM_REG_IOMSTR_INTEN_CMDCMP_M, AM_REG_IOMSTR_INTEN_CMDCMP_M); // // Re-mark IOM as busy // g_bIomBusy[ui32Module] = true; // // Re-enable IOM interrupts. Make sure CMDCMP is cleared // AM_REGn(IOMSTR, 4, INTCLR) = (ui32IntConfig | AM_REG_IOMSTR_INTSTAT_CMDCMP_M); AM_REGn(IOMSTR, 4, INTEN) = ui32IntConfig; } // // Prepare the global IOM buffer structure. // g_psIOMBuffers[ui32Module].ui32State = BUFFER_RECEIVING; g_psIOMBuffers[ui32Module].pui32Data = pui32Data; g_psIOMBuffers[ui32Module].ui32BytesLeft = ui32NumBytes; g_psIOMBuffers[ui32Module].pfnCallback = pfnCallback; g_psIOMBuffers[ui32Module].ui32Options = ui32Options; // // Start the read transaction on the bus. // am_hal_iom_spi_cmd_run(AM_HAL_IOM_READ, ui32Module, ui32ChipSelect, ui32NumBytes, ui32Options); am_hal_debug_assert_msg(ui32Status == 1,"IOM CMDCMP was not seen"); return ui32Status; } static uint32_t internal_am_hal_iom_spi_cmd_construct(uint32_t ui32Operation, uint32_t ui32ChipSelect, uint32_t ui32NumBytes, uint32_t ui32Options) { uint32_t ui32Command; // // Start building the command from the operation parameter. // ui32Command = ui32Operation; // // Set the transfer length (the length field is split, so this requires // some swizzling). // ui32Command |= ((ui32NumBytes & 0xF00) << 15); ui32Command |= (ui32NumBytes & 0xFF); // // Set the chip select number. // ui32Command |= ((ui32ChipSelect << 16) & 0x00070000); // // Finally, OR in the rest of the options. This mask should make sure that // erroneous option values won't interfere with the other transfer // parameters. // ui32Command |= ui32Options & 0x5C00FF00; return ui32Command; } //***************************************************************************** // //! @brief Runs a SPI "command" through the IO master. //! //! @param ui32Operation - SPI action to be performed. //! //! @param psDevice - Structure containing information about the slave device. //! //! @param ui32NumBytes - Number of bytes to move (transmit or receive) with //! this command. //! //! @param ui32Options - Additional SPI options to apply to this command. //! //! @return None. // //***************************************************************************** void am_hal_iom_spi_cmd_run(uint32_t ui32Operation, uint32_t ui32Module, uint32_t ui32ChipSelect, uint32_t ui32NumBytes, uint32_t ui32Options) { uint32_t ui32Command; am_hal_debug_assert_msg(ui32NumBytes > 0, "Trying to do a 0 byte transaction"); ui32Command = internal_am_hal_iom_spi_cmd_construct(ui32Operation, ui32ChipSelect, ui32NumBytes, ui32Options); // // Write the complete command word to the IOM command register. // AM_REGn(IOMSTR, ui32Module, CMD) = ui32Command; } //***************************************************************************** // //! @brief Perform a simple write to the I2C interface (without queuing) //! //! @param ui32Module - Module number for the IOM. //! @param ui32BusAddress - I2C address of the target device. //! @param pui32Data - Pointer to the bytes that will be sent. //! @param ui32NumBytes - Number of bytes to send. //! @param ui32Options - Additional I2C transfer options. //! //! This function performs I2C writes to a selected I2C device. //! //! This function call is a blocking implementation. It will write as much //! data to the FIFO as possible immediately, and then refill the FIFO as data //! is transmiitted. //! //! @note The actual SPI and I2C interfaces operate in BYTES, not 32-bit words //! This means that you will need to byte-pack the \e pui32Data array with the //! data you intend to send over the interface. One easy way to do this is to //! declare the array as a 32-bit integer array, but use an 8-bit pointer to //! put your actual data into the array. If there are not enough bytes in your //! desired message to completely fill the last 32-bit word, you may pad that //! last word with bytes of any value. The IOM hardware will only read the //! first \e ui32NumBytes in the \e pui32Data array. //! //! @return None. // //***************************************************************************** uint32_t am_hal_iom_i2c_write_nq(uint32_t ui32Module, uint32_t ui32BusAddress, uint32_t *pui32Data, uint32_t ui32NumBytes, uint32_t ui32Options) { uint32_t ui32TransferSize; uint32_t ui32SpaceInFifo; uint32_t ui32IntConfig; uint32_t ui32MaxFifoSize; uint32_t ui32Status = 1; // // Validate parameters // if ( ui32Module > AM_REG_IOMSTR_NUM_MODULES ) { return 0; } am_hal_debug_assert_msg(ui32NumBytes > 0, "Trying to do a 0 byte transaction"); // // Redirect to the bit-bang interface if the module number matches the // software I2C module. // if ( ui32Module == AM_HAL_IOM_I2CBB_MODULE ) { if ( ui32Options & AM_HAL_IOM_RAW ) { am_hal_i2c_bit_bang_send(ui32BusAddress << 1, ui32NumBytes, (uint8_t *)pui32Data, 0, false, (ui32Options & AM_HAL_IOM_NO_STOP)); } else { am_hal_i2c_bit_bang_send(ui32BusAddress << 1, ui32NumBytes, (uint8_t *)pui32Data, ((ui32Options & 0xFF00) >> 8), true, (ui32Options & AM_HAL_IOM_NO_STOP)); } // // Return. // return 0; } // // Make sure the transfer isn't too long for the hardware to support. // am_hal_debug_assert_msg(ui32NumBytes < 256, "I2C transfer too big."); ui32MaxFifoSize = ((0 == AM_BFRn(IOMSTR, ui32Module, CFG, FULLDUP)) ? AM_HAL_IOM_MAX_FIFO_SIZE : AM_HAL_IOM_MAX_FIFO_SIZE / 2); // // Wait until any earlier transactions have completed. // am_hal_iom_poll_complete(ui32Module); // // Disable interrupts so that we don't get any undesired interrupts. // ui32IntConfig = AM_REGn(IOMSTR, ui32Module, INTEN); AM_REGn(IOMSTR, ui32Module, INTEN) = 0; // // Clear CMDCMP status // AM_BFWn(IOMSTR, ui32Module, INTCLR, CMDCMP, 1); // // Figure out how many bytes we can write to the FIFO immediately. // ui32TransferSize = (ui32NumBytes <= ui32MaxFifoSize ? ui32NumBytes : ui32MaxFifoSize); am_hal_iom_fifo_write(ui32Module, pui32Data, ui32TransferSize); // // Start the write on the bus. // am_hal_iom_i2c_cmd_run(AM_HAL_IOM_WRITE, ui32Module, ui32BusAddress, ui32NumBytes, ui32Options); // // Update the pointer and data counter. // ui32NumBytes -= ui32TransferSize; pui32Data += ui32TransferSize >> 2; // // Keep looping until we're out of bytes to send or command complete (error). // while ( ui32NumBytes && !AM_BFRn(IOMSTR, ui32Module, INTSTAT, CMDCMP) ) { // // This will always return a multiple of four. // ui32SpaceInFifo = am_hal_iom_fifo_empty_slots(ui32Module); if ( ui32NumBytes <= ui32SpaceInFifo ) { // // If the entire message will fit in the fifo, prepare to copy // everything. // ui32TransferSize = ui32NumBytes; } else { // // If only a portion of the message will fit in the fifo, prepare // to copy the largest number of 4-byte blocks possible. // ui32TransferSize = ui32SpaceInFifo; } // // Write this chunk to the fifo. // am_hal_iom_fifo_write(ui32Module, pui32Data, ui32TransferSize); // // Update the data pointer and bytes-left count. // ui32NumBytes -= ui32TransferSize; pui32Data += ui32TransferSize >> 2; } // // Make sure CMDCMP was raised, // ui32Status = am_util_wait_status_change(ui32StatusTimeout[ui32Module], AM_REG_IOMSTRn(ui32Module) + AM_REG_IOMSTR_INTSTAT_O, AM_REG_IOMSTR_INTEN_CMDCMP_M, AM_REG_IOMSTR_INTEN_CMDCMP_M); // // Re-enable IOM interrupts. Make sure CMDCMP is cleared // AM_REGn(IOMSTR, ui32Module, INTCLR) = (ui32IntConfig | AM_REG_IOMSTR_INTSTAT_CMDCMP_M); AM_REGn(IOMSTR, ui32Module, INTEN) = ui32IntConfig; am_hal_debug_assert_msg(ui32Status == 1,"IOM CMDCMP was not seen"); // // Return the status (0 = timeout; 1 = success) // return ui32Status; } //***************************************************************************** // //! @brief Perform simple I2C read operations (without queuing). //! //! @param ui32Module - Module number for the IOM. //! @param ui32BusAddress - I2C address of the target device. //! @param pui32Data - Pointer to the array where received bytes should go. //! @param ui32NumBytes - Number of bytes to read. //! @param ui32Options - Additional I2C transfer options. //! //! This function performs an I2C read to a selected I2C device. //! //! This function call is a blocking implementation. It will read as much //! data from the FIFO as possible immediately, and then re-read the FIFO as more //! data is available. //! //! @note The actual SPI and I2C interfaces operate in BYTES, not 32-bit words. //! This function will pack the individual bytes from the physical interface //! into 32-bit words, which are then placed into the \e pui32Data array. Only //! the first \e ui32NumBytes bytes in this array will contain valid data. //! //! @return None. // //***************************************************************************** uint32_t am_hal_iom_i2c_read_nq(uint32_t ui32Module, uint32_t ui32BusAddress, uint32_t *pui32Data, uint32_t ui32NumBytes, uint32_t ui32Options) { uint32_t ui32BytesInFifo; uint32_t ui32IntConfig; uint32_t bCmdCmp = false; uint32_t ui32Status = 1; // // Validate parameters // if ( ui32Module > AM_REG_IOMSTR_NUM_MODULES ) { return 0; } am_hal_debug_assert_msg(ui32NumBytes > 0, "Trying to do a 0 byte transaction"); // // Redirect to the bit-bang interface if the module number matches the // software I2C module. // if ( ui32Module == AM_HAL_IOM_I2CBB_MODULE ) { if ( ui32Options & AM_HAL_IOM_RAW ) { am_hal_i2c_bit_bang_receive((ui32BusAddress << 1) | 1, ui32NumBytes, (uint8_t *)pui32Data, 0, false, (ui32Options & AM_HAL_IOM_NO_STOP)); } else { am_hal_i2c_bit_bang_receive((ui32BusAddress << 1) | 1, ui32NumBytes, (uint8_t *)pui32Data, ((ui32Options & 0xFF00) >> 8), true, (ui32Options & AM_HAL_IOM_NO_STOP)); } // // Return. // return 0; } // // Make sure the transfer isn't too long for the hardware to support. // am_hal_debug_assert_msg(ui32NumBytes < 256, "I2C transfer too big."); // // Wait until the bus is idle // am_hal_iom_poll_complete(ui32Module); // // Disable interrupts so that we don't get any undesired interrupts. // ui32IntConfig = AM_REGn(IOMSTR, ui32Module, INTEN); AM_REGn(IOMSTR, ui32Module, INTEN) = 0; // // Clear CMDCMP status // AM_BFWn(IOMSTR, ui32Module, INTCLR, CMDCMP, 1); am_hal_iom_i2c_cmd_run(AM_HAL_IOM_READ, ui32Module, ui32BusAddress, ui32NumBytes, ui32Options); // // Start a loop to catch the Rx data. // while ( ui32NumBytes ) { ui32BytesInFifo = am_hal_iom_fifo_full_slots(ui32Module); if ( ui32BytesInFifo >= ui32NumBytes ) { // // If the fifo contains our entire message, just copy the whole // thing out. // am_hal_iom_fifo_read(ui32Module, pui32Data, ui32NumBytes); ui32NumBytes = 0; } else if ( ui32BytesInFifo >= 4 ) { // // If the fifo has at least one 32-bit word in it, copy whole // words out. // am_hal_iom_fifo_read(ui32Module, pui32Data, ui32BytesInFifo & ~0x3); ui32NumBytes -= ui32BytesInFifo & ~0x3; pui32Data += ui32BytesInFifo >> 2; } if ( bCmdCmp == true ) { // No more data expected - exit out of loop break; } bCmdCmp = AM_BFRn(IOMSTR, ui32Module, INTSTAT, CMDCMP); } // // Make sure CMDCMP was raised, // ui32Status = am_util_wait_status_change(ui32StatusTimeout[ui32Module], AM_REG_IOMSTRn(ui32Module) + AM_REG_IOMSTR_INTSTAT_O, AM_REG_IOMSTR_INTEN_CMDCMP_M, AM_REG_IOMSTR_INTEN_CMDCMP_M); // // Re-enable IOM interrupts. Make sure CMDCMP is cleared // AM_REGn(IOMSTR, ui32Module, INTCLR) = (ui32IntConfig | AM_REG_IOMSTR_INTSTAT_CMDCMP_M); AM_REGn(IOMSTR, ui32Module, INTEN) = ui32IntConfig; am_hal_debug_assert_msg(ui32Status == 1,"IOM CMDCMP was not seen"); // // Return the status (0 = timeout; 1 = success) // return ui32Status; } //***************************************************************************** // //! @brief Perform a simple write to the I2C interface. //! //! @param ui32Module - Module number for the IOM //! @param ui32BusAddress - I2C bus address for this transaction. //! @param pui32Data - Pointer to the bytes that will be sent. //! @param ui32NumBytes - Number of bytes to send. //! @param ui32Options - Additional options //! //! Performs a write to the I2C interface using the provided parameters. //! //! See the "Command Options" section for parameters that may be ORed together //! and used in the \b ui32Options parameter. //! //! @return None. // //***************************************************************************** void am_hal_iom_i2c_write(uint32_t ui32Module, uint32_t ui32BusAddress, uint32_t *pui32Data, uint32_t ui32NumBytes, uint32_t ui32Options) { // // Validate parameters // if ( ui32Module > AM_REG_IOMSTR_NUM_MODULES ) { return; } am_hal_debug_assert_msg(ui32NumBytes > 0, "Trying to do a 0 byte transaction"); // // Redirect to the bit-bang interface if the module number matches the // software I2C module. // if ( ui32Module == AM_HAL_IOM_I2CBB_MODULE ) { if ( ui32Options & AM_HAL_IOM_RAW ) { am_hal_i2c_bit_bang_send(ui32BusAddress << 1, ui32NumBytes, (uint8_t *)pui32Data, 0, false, (ui32Options & AM_HAL_IOM_NO_STOP)); } else { am_hal_i2c_bit_bang_send(ui32BusAddress << 1, ui32NumBytes, (uint8_t *)pui32Data, ((ui32Options & 0xFF00) >> 8), true, (ui32Options & AM_HAL_IOM_NO_STOP)); } // // Return. // return; } // // Make sure the transfer isn't too long for the hardware to support. // am_hal_debug_assert_msg(ui32NumBytes < 256, "I2C transfer too big."); // // Check to see if queues have been enabled. If they are, we'll actually // switch to the queued interface. // if ( g_psIOMQueue[ui32Module].pui8Data != NULL ) { // // If the queue is on, go ahead and add this transaction to the queue. // am_hal_iom_queue_i2c_write(ui32Module, ui32BusAddress, pui32Data, ui32NumBytes, ui32Options, 0); // // Wait until the transaction actually clears. // am_hal_iom_queue_flush(ui32Module); // // At this point, we've completed the transaction, and we can return. // return; } else { // // Otherwise, we'll just do a polled transaction. // am_hal_iom_i2c_write_nq(ui32Module, ui32BusAddress, pui32Data, ui32NumBytes, ui32Options); } } //***************************************************************************** // //! @brief Perform simple I2C read operations. //! //! @param ui32Module - Module number for the IOM //! @param ui32BusAddress - I2C bus address for this transaction. //! @param pui32Data - Pointer to the array where received bytes should go. //! @param ui32NumBytes - Number of bytes to read. //! @param ui32Options - Additional I2C transfer options. //! //! This function performs simple I2C read operations. The caller is //! responsible for ensuring that the receive buffer is large enough to hold //! the requested amount of data. If \e bPolled is true, this function will //! block until all of the requested data has been received and placed in the //! user-supplied buffer. Otherwise, the function will execute the I2C read //! command and return immediately. The user-supplied buffer will be filled //! with the received I2C data as it comes in over the physical interface, and //! the "command complete" interrupt bit will become active once the entire //! message is available. //! //! See the "Command Options" section for parameters that may be ORed together //! and used in the \b ui32Options parameter. //! //! @note The actual SPI and I2C interfaces operate in BYTES, not 32-bit words. //! This function will pack the individual bytes from the physical interface //! into 32-bit words, which are then placed into the \e pui32Data array. Only //! the first \e ui32NumBytes bytes in this array will contain valid data. //! //! @return None. // //***************************************************************************** void am_hal_iom_i2c_read(uint32_t ui32Module, uint32_t ui32BusAddress, uint32_t *pui32Data, uint32_t ui32NumBytes, uint32_t ui32Options) { // // Validate parameters // if ( ui32Module > AM_REG_IOMSTR_NUM_MODULES ) { return; } am_hal_debug_assert_msg(ui32NumBytes > 0, "Trying to do a 0 byte transaction"); // // Redirect to the bit-bang interface if the module number matches the // software I2C module. // if ( ui32Module == AM_HAL_IOM_I2CBB_MODULE ) { if ( ui32Options & AM_HAL_IOM_RAW ) { am_hal_i2c_bit_bang_receive((ui32BusAddress << 1) | 1, ui32NumBytes, (uint8_t *)pui32Data, 0, false, (ui32Options & AM_HAL_IOM_NO_STOP)); } else { am_hal_i2c_bit_bang_receive((ui32BusAddress << 1) | 1, ui32NumBytes, (uint8_t *)pui32Data, ((ui32Options & 0xFF00) >> 8), true, (ui32Options & AM_HAL_IOM_NO_STOP)); } // // Return. // return; } // // Make sure the transfer isn't too long for the hardware to support. // am_hal_debug_assert_msg(ui32NumBytes < 256, "I2C transfer too big."); // // Check to see if queues have been enabled. If they are, we'll actually // switch to the queued interface. // if ( g_psIOMQueue[ui32Module].pui8Data != NULL ) { // // If the queue is on, go ahead and add this transaction to the queue. // am_hal_iom_queue_i2c_read(ui32Module, ui32BusAddress, pui32Data, ui32NumBytes, ui32Options, 0); // // Wait until the transaction actually clears. // am_hal_iom_queue_flush(ui32Module); // // At this point, we've completed the transaction, and we can return. // return; } else { // // Otherwise, just perform a polled transaction. // am_hal_iom_i2c_read_nq(ui32Module, ui32BusAddress, pui32Data, ui32NumBytes, ui32Options); } } //***************************************************************************** // //! @brief Perform a non-blocking write to the I2C interface. //! //! @param ui32Module - Module number for the IOM. //! @param ui32BusAddress - I2C address of the target device. //! @param pui32Data - Pointer to the bytes that will be sent. //! @param ui32NumBytes - Number of bytes to send. //! @param ui32Options - Additional I2C transfer options. //! @param pfnCallback - Function to call when the transaction completes. //! //! This function performs I2C writes to a selected I2C device. //! //! This function call is a non-blocking implementation. It will write as much //! data to the FIFO as possible immediately, store a pointer to the remaining //! data, start the transfer on the bus, and then immediately return. The //! caller will need to make sure that \e am_hal_iom_int_service() is called //! for IOM FIFO interrupt events and "command complete" interrupt events. The //! \e am_hal_iom_int_service() function will refill the FIFO as necessary and //! call the \e pfnCallback function when the transaction is finished. //! //! @note The actual SPI and I2C interfaces operate in BYTES, not 32-bit words. //! This means that you will need to byte-pack the \e pui32Data array with the //! data you intend to send over the interface. One easy way to do this is to //! declare the array as a 32-bit integer array, but use an 8-bit pointer to //! put your actual data into the array. If there are not enough bytes in your //! desired message to completely fill the last 32-bit word, you may pad that //! last word with bytes of any value. The IOM hardware will only read the //! first \e ui32NumBytes in the \e pui32Data array. //! //! @return None. // //***************************************************************************** void am_hal_iom_i2c_write_nb(uint32_t ui32Module, uint32_t ui32BusAddress, uint32_t *pui32Data, uint32_t ui32NumBytes, uint32_t ui32Options, am_hal_iom_callback_t pfnCallback) { uint32_t ui32TransferSize; uint32_t ui32MaxFifoSize; // // Validate parameters // if ( ui32Module > AM_REG_IOMSTR_NUM_MODULES ) { return; } am_hal_debug_assert_msg(ui32NumBytes > 0, "Trying to do a 0 byte transaction"); // // Redirect to the bit-bang interface if the module number matches the // software I2C module. // if ( ui32Module == AM_HAL_IOM_I2CBB_MODULE ) { if ( ui32Options & AM_HAL_IOM_RAW ) { am_hal_i2c_bit_bang_send(ui32BusAddress << 1, ui32NumBytes, (uint8_t *)pui32Data, 0, false, (ui32Options & AM_HAL_IOM_NO_STOP)); } else { am_hal_i2c_bit_bang_send(ui32BusAddress << 1, ui32NumBytes, (uint8_t *)pui32Data, ((ui32Options & 0xFF00) >> 8), true, (ui32Options & AM_HAL_IOM_NO_STOP)); } // // The I2C bit-bang interface is actually a blocking transfer, and it // doesn't trigger the interrupt handler, so we have to call the // callback function manually. // if ( pfnCallback ) { pfnCallback(); } // // Return. // return; } // // Make sure the transfer isn't too long for the hardware to support. // am_hal_debug_assert_msg(ui32NumBytes < 256, "I2C transfer too big."); ui32MaxFifoSize = ((0 == AM_BFRn(IOMSTR, ui32Module, CFG, FULLDUP)) ? AM_HAL_IOM_MAX_FIFO_SIZE : AM_HAL_IOM_MAX_FIFO_SIZE / 2); // // Figure out how many bytes we can write to the FIFO immediately. // ui32TransferSize = (ui32NumBytes <= ui32MaxFifoSize ? ui32NumBytes : ui32MaxFifoSize); // // Wait until any earlier transactions have completed, and then write our // first word to the fifo. // am_hal_iom_poll_complete(ui32Module); // Need to mark IOM busy to avoid another transaction to be scheduled. // This is to take care of a race condition in Queue mode, where the IDLE // set is not a guarantee that the CMDCMP has been received g_bIomBusy[ui32Module] = true; // // Clear CMDCMP status // AM_BFWn(IOMSTR, ui32Module, INTCLR, CMDCMP, 1); if ( am_hal_iom_fifo_write(ui32Module, pui32Data, ui32TransferSize) > 0 ) { // // Prepare the global IOM buffer structure. // g_psIOMBuffers[ui32Module].ui32State = BUFFER_SENDING; g_psIOMBuffers[ui32Module].pui32Data = pui32Data; g_psIOMBuffers[ui32Module].ui32BytesLeft = ui32NumBytes; g_psIOMBuffers[ui32Module].pfnCallback = pfnCallback; // // Update the pointer and the byte counter based on the portion of the // transfer we just sent to the fifo. // g_psIOMBuffers[ui32Module].ui32BytesLeft -= ui32TransferSize; g_psIOMBuffers[ui32Module].pui32Data += (ui32TransferSize / 4); // // Start the write on the bus. // am_hal_iom_i2c_cmd_run(AM_HAL_IOM_WRITE, ui32Module, ui32BusAddress, ui32NumBytes, ui32Options); } } //***************************************************************************** // //! @brief Perform a non-blocking I2C read. //! //! @param ui32Module - Module number for the IOM. //! @param ui32ChipSelect - I2C address of the target device. //! @param pui32Data - Pointer to the array where received bytes should go. //! @param ui32NumBytes - Number of bytes to read. //! @param ui32Options - Additional I2C transfer options. //! @param pfnCallback - Function to call when the transaction completes. //! //! This function performs an I2C read to a selected I2C device. //! //! This function call is a non-blocking implementation. It will start the I2C //! transaction on the bus and store a pointer for the destination for the read //! data, but it will not wait for the I2C transaction to finish. The caller //! will need to make sure that \e am_hal_iom_int_service() is called for IOM //! FIFO interrupt events and "command complete" interrupt events. The \e //! am_hal_iom_int_service() function will empty the FIFO as necessary, //! transfer the data to the \e pui32Data buffer, and call the \e pfnCallback //! function when the transaction is finished. //! //! @note The actual SPI and I2C interfaces operate in BYTES, not 32-bit words. //! This function will pack the individual bytes from the physical interface //! into 32-bit words, which are then placed into the \e pui32Data array. Only //! the first \e ui32NumBytes bytes in this array will contain valid data. //! //! @return None. // //***************************************************************************** void am_hal_iom_i2c_read_nb(uint32_t ui32Module, uint32_t ui32BusAddress, uint32_t *pui32Data, uint32_t ui32NumBytes, uint32_t ui32Options, am_hal_iom_callback_t pfnCallback) { // // Validate parameters // if ( ui32Module > AM_REG_IOMSTR_NUM_MODULES ) { return; } am_hal_debug_assert_msg(ui32NumBytes > 0, "Trying to do a 0 byte transaction"); // // Redirect to the bit-bang interface if the module number matches the // software I2C module. // if ( ui32Module == AM_HAL_IOM_I2CBB_MODULE ) { if ( ui32Options & AM_HAL_IOM_RAW ) { am_hal_i2c_bit_bang_receive((ui32BusAddress << 1) | 1, ui32NumBytes, (uint8_t *)pui32Data, 0, false, (ui32Options & AM_HAL_IOM_NO_STOP)); } else { am_hal_i2c_bit_bang_receive((ui32BusAddress << 1) | 1, ui32NumBytes, (uint8_t *)pui32Data, ((ui32Options & 0xFF00) >> 8), true, (ui32Options & AM_HAL_IOM_NO_STOP)); } // // The I2C bit-bang interface is actually a blocking transfer, and it // doesn't trigger the interrupt handler, so we have to call the // callback function manually. // if ( pfnCallback ) { pfnCallback(); } // // Return. // return; } // // Make sure the transfer isn't too long for the hardware to support. // am_hal_debug_assert_msg(ui32NumBytes < 256, "I2C transfer too big."); // // Wait until the bus is idle // am_hal_iom_poll_complete(ui32Module); // // Need to mark IOM busy to avoid another transaction to be scheduled. // This is to take care of a race condition in Queue mode, where the IDLE // set is not a guarantee that the CMDCMP has been received // g_bIomBusy[ui32Module] = true; // // Clear CMDCMP status // AM_BFWn(IOMSTR, ui32Module, INTCLR, CMDCMP, 1); // // Prepare the global IOM buffer structure. // g_psIOMBuffers[ui32Module].ui32State = BUFFER_RECEIVING; g_psIOMBuffers[ui32Module].pui32Data = pui32Data; g_psIOMBuffers[ui32Module].ui32BytesLeft = ui32NumBytes; g_psIOMBuffers[ui32Module].pfnCallback = pfnCallback; // // Start the read transaction on the bus. // am_hal_iom_i2c_cmd_run(AM_HAL_IOM_READ, ui32Module, ui32BusAddress, ui32NumBytes, ui32Options); } //***************************************************************************** // //! @brief Runs a I2C "command" through the IO master. //! //! @param ui32Operation - I2C action to be performed. This should either be //! AM_HAL_IOM_WRITE or AM_HAL_IOM_READ. //! @param psDevice - Structure containing information about the slave device. //! @param ui32NumBytes - Number of bytes to move (transmit or receive) with //! this command. //! @param ui32Options - Additional I2C options to apply to this command. //! //! This function may be used along with am_hal_iom_fifo_write and //! am_hal_iom_fifo_read to perform more complex I2C reads and writes. This //! function //! //! @return None. // //***************************************************************************** void am_hal_iom_i2c_cmd_run(uint32_t ui32Operation, uint32_t ui32Module, uint32_t ui32BusAddress, uint32_t ui32NumBytes, uint32_t ui32Options) { uint32_t ui32Command; // // Validate parameters // if ( ui32Module >= AM_REG_IOMSTR_NUM_MODULES ) { return; } am_hal_debug_assert_msg(ui32NumBytes > 0, "Trying to do a 0 byte transaction"); // // Start building the command from the operation parameter. // ui32Command = ui32Operation; // // Set the transfer length. // ui32Command |= (ui32NumBytes & 0xFF); // // Set the chip select number. // ui32Command |= ((ui32BusAddress << 16) & 0x03FF0000); // // Finally, OR in the rest of the options. This mask should make sure that // erroneous option values won't interfere with the other transfer // parameters. // ui32Command |= (ui32Options & 0x5C00FF00); // // Write the complete command word to the IOM command register. // AM_REGn(IOMSTR, ui32Module, CMD) = ui32Command; } //***************************************************************************** // //! @brief Sets the repeat count for the next IOM command. //! //! @param ui32Module is the IOM module number. //! @param ui32CmdCount is the number of times the next command should be //! executed. //! //! @note This function is not compatible with the am_hal_iom_spi_read/write() //! or am_hal_iom_i2c_read/write() functions. Instead, you will need to use the //! am_hal_iom_fifo_read/write() functions and the am_hal_iom_spi/i2c_cmd_run() //! functions. //! //! Example usage: //! @code //! //! // //! // Create a buffer and add 3 bytes of data to it. //! // //! am_hal_iom_buffer(3) psBuffer; //! psBuffer.bytes[0] = 's'; //! psBuffer.bytes[1] = 'p'; //! psBuffer.bytes[2] = 'i'; //! //! // //! // Send three different bytes to the same SPI register on a remote device. //! // //! am_hal_iom_fifo_write(ui32Module, psBuffer.words, 3); //! //! am_hal_command_repeat_set(ui32Module, 3); //! //! am_hal_iom_spi_cmd_run(AM_HAL_IOM_WRITE, psDevice, 1, //! AM_HAL_IOM_OFFSET(0x5)); //! //! // //! // The sequence "0x5, 's', 0x5, 'p', 0x5, 'i'" should be written to the SPI //! // bus. //! // //! //! @endcode //! //! @return None. // //***************************************************************************** void am_hal_iom_command_repeat_set(uint32_t ui32Module, uint32_t ui32CmdCount) { // // Validate parameters // if ( ui32Module >= AM_REG_IOMSTR_NUM_MODULES ) { return; } AM_REGn(IOMSTR, ui32Module, CMDRPT) = ui32CmdCount; } //***************************************************************************** // //! @brief Writes data to the IOM FIFO. //! //! @param ui32Module - Selects the IOM module to use (zero or one). //! @param pui32Data - Pointer to an array of the data to be written. //! @param ui32NumBytes - Number of BYTES to copy into the FIFO. //! //! This function copies data from the array \e pui32Data into the IOM FIFO. //! This prepares the data to eventually be sent as SPI or I2C data by an IOM //! "command". //! //! @note The actual SPI and I2C interfaces operate in BYTES, not 32-bit words. //! This means that you will need to byte-pack the \e pui32Data array with the //! data you intend to send over the interface. One easy way to do this is to //! declare the array as a 32-bit integer array, but use an 8-bit pointer to //! put your actual data into the array. If there are not enough bytes in your //! desired message to completely fill the last 32-bit word, you may pad that //! last word with bytes of any value. The IOM hardware will only read the //! first \e ui32NumBytes in the \e pui8Data array. //! //! @note This function may be used to write partial or complete SPI or I2C //! messages into the IOM FIFO. When writing partial messages to the FIFO, make //! sure that the number of bytes written is a multiple of four. Only the last //! 'part' of a message may consist of a number of bytes that is not a multiple //! of four. If this rule is not followed, the IOM will not be able to send //! these bytes correctly. //! //! @return Number of bytes actually written to the FIFO. // //***************************************************************************** uint32_t am_hal_iom_fifo_write(uint32_t ui32Module, uint32_t *pui32Data, uint32_t ui32NumBytes) { uint32_t ui32Index; // // Validate parameters // if ( ui32Module >= AM_REG_IOMSTR_NUM_MODULES ) { return 0; } // // Make sure we check the number of bytes we're writing to the FIFO. // am_hal_debug_assert_msg((am_hal_iom_fifo_empty_slots(ui32Module) >= ui32NumBytes), "The fifo couldn't fit the requested number of bytes"); // // Loop over the words in the array until we have the correct number of // bytes. // for ( ui32Index = 0; (4 * ui32Index) < ui32NumBytes; ui32Index++ ) { // // Write the word to the FIFO. // AM_REGn(IOMSTR, ui32Module, FIFO) = pui32Data[ui32Index]; } return ui32NumBytes; } //***************************************************************************** // //! @brief Reads data from the IOM FIFO. //! //! @param ui32Module - Selects the IOM module to use (zero or one). //! @param pui32Data - Pointer to an array where the FIFO data will be copied. //! @param ui32NumBytes - Number of bytes to copy into array. //! //! This function copies data from the IOM FIFO into the array \e pui32Data. //! This is how input data from SPI or I2C transactions may be retrieved. //! //! @note The actual SPI and I2C interfaces operate in BYTES, not 32-bit words. //! This function will pack the individual bytes from the physical interface //! into 32-bit words, which are then placed into the \e pui32Data array. Only //! the first \e ui32NumBytes bytes in this array will contain valid data. //! //! @return Number of bytes read from the fifo. // //***************************************************************************** uint32_t am_hal_iom_fifo_read(uint32_t ui32Module, uint32_t *pui32Data, uint32_t ui32NumBytes) { am_hal_iom_buffer(4) sTempBuffer; uint32_t i, j, ui32NumWords, ui32Leftovers; uint8_t *pui8Data; // // Validate parameters // if ( ui32Module >= AM_REG_IOMSTR_NUM_MODULES ) { return 0; } // // Make sure we check the number of bytes we're reading from the FIFO. // am_hal_debug_assert_msg((am_hal_iom_fifo_full_slots(ui32Module) >= ui32NumBytes), "The fifo doesn't contain the requested number of bytes."); // // Figure out how many whole words we're reading from the fifo, and how // many bytes will be left over when we're done. // ui32NumWords = ui32NumBytes / 4; ui32Leftovers = ui32NumBytes - (ui32NumWords * 4); // // Copy out as many full words as we can. // for ( i = 0; i < ui32NumWords; i++ ) { // // Copy data out of the FIFO, one word at a time. // pui32Data[i] = AM_REGn(IOMSTR, ui32Module, FIFO); } // // If there were leftovers, we'll copy them carefully. Pull the last word // from the fifo (there should only be one) into a temporary buffer. Also, // create an 8-bit pointer to help us copy the remaining bytes one at a // time. // // Note: If the data buffer we were given was truly a word pointer like the // definition requests, we wouldn't need to do this. It's possible to call // this function with a re-cast or packed pointer instead though. If that // happens, we want to be careful not to overwrite any data that might be // sitting just past the end of the destination array. // if ( ui32Leftovers ) { sTempBuffer.words[0] = AM_REGn(IOMSTR, ui32Module, FIFO); pui8Data = (uint8_t *) (&pui32Data[i]); // // If we had leftover bytes, copy them out one byte at a time. // for ( j = 0; j < ui32Leftovers; j++ ) { pui8Data[j] = sTempBuffer.bytes[j]; } } return ui32NumBytes; } //***************************************************************************** // //! @brief Check amount of empty space in the IOM fifo. //! //! @param ui32Module - Module number of the IOM whose fifo should be checked. //! //! Returns the number of bytes that could be written to the IOM fifo without //! causing an overflow. //! //! @return Amount of space available in the fifo (in bytes). // //***************************************************************************** uint8_t am_hal_iom_fifo_empty_slots(uint32_t ui32Module) { uint32_t ui32MaxFifoSize; // // Validate parameters // if ( ui32Module >= AM_REG_IOMSTR_NUM_MODULES ) { return 0; } ui32MaxFifoSize = ((0 == AM_BFRn(IOMSTR, ui32Module, CFG, FULLDUP)) ? AM_HAL_IOM_MAX_FIFO_SIZE : AM_HAL_IOM_MAX_FIFO_SIZE / 2); // // Calculate the FIFO Remaining from the FIFO size. This will be different // depending on whether the IOM is configured for half-duplex or // full-duplex. // return (ui32MaxFifoSize - AM_BFRn(IOMSTR, ui32Module, FIFOPTR, FIFOSIZ)) & (~0x3); } //***************************************************************************** // //! @brief Check to see how much data is in the IOM fifo. //! //! @param ui32Module - Module number of the IOM whose fifo should be checked. //! //! Returns the number of bytes of data that are currently in the IOM fifo. //! //! @return Number of bytes in the fifo. // //***************************************************************************** uint8_t am_hal_iom_fifo_full_slots(uint32_t ui32Module) { // // Validate parameters // if ( ui32Module >= AM_REG_IOMSTR_NUM_MODULES ) { return 0; } return AM_BFRn(IOMSTR, ui32Module, FIFOPTR, FIFOSIZ); } //***************************************************************************** // //! @brief Wait for the current IOM command to complete. //! //! @param ui32Module - The module number of the IOM to use. //! //! This function polls until the IOM bus becomes idle. //! //! @return None. // //***************************************************************************** void am_hal_iom_poll_complete(uint32_t ui32Module) { // // Validate parameters // if ( ui32Module >= AM_REG_IOMSTR_NUM_MODULES ) { return; } // // Poll on the IDLE bit in the status register. // while ( g_bIomBusy[ui32Module] ); } //***************************************************************************** // //! @brief Returns the contents of the IOM status register. //! //! @param ui32Module IOM instance to check the status of. //! //! This function is just a wrapper around the IOM status register. //! //! @return 32-bit contents of IOM status register. // //***************************************************************************** uint32_t am_hal_iom_status_get(uint32_t ui32Module) { // // Validate parameters // if ( ui32Module >= AM_REG_IOMSTR_NUM_MODULES ) { return 0; } return AM_REGn(IOMSTR, ui32Module, STATUS); } //***************************************************************************** // //! @brief Returns current error state of the IOM. //! //! @param ui32Module IOM instance to check the status of. //! //! This function returns status indicating whether the IOM has incurred any //! errors or not. //! //! @return 0 if all is well. //! Otherwise error status as a bitmask of: //! AM_HAL_IOM_ERR_INVALID_MODULE //! AM_HAL_IOM_INT_ARB Another master initiated an operation //! simultaenously and the IOM lost. Or //! the IOM started an operation but found //! SDA already low. //! AM_HAL_IOM_INT_START A START from another master detected. //! SW must wait for STOP before continuing. //! AM_HAL_IOM_INT_ICMD Attempt to issue a CMD while another //! CMD was already in progress, or issue a //! non-zero-len write CMD with empty FIFO. //! AM_HAL_IOM_INT_IACC Attempt to read the FIFO on a write. Or //! an attempt to write the FIFO on a read. //! AM_HAL_IOM_INT_NAK Expected ACK from slave not received. //! AM_HAL_IOM_INT_FOVFL Attempt to write the FIFO while full //! (FIFOSIZ > 124). //! AM_HAL_IOM_INT_FUNDFL Attempt to read FIFO when empty (that is //! FIFOSIZ < 4). //! Note - see the datasheet text for full explanations of the INT errs. // //***************************************************************************** uint32_t am_hal_iom_error_status_get(uint32_t ui32Module) { uint32_t ui32intstat = 0; // // Validate parameters // if ( ui32Module >= AM_REG_IOMSTR_NUM_MODULES ) { // // AM_HAL_IOM_ERR_INVALID_MODULE is defined as an unused interrupt bit. // return AM_HAL_IOM_ERR_INVALID_MODULE; } if ( AM_REGn(IOMSTR, ui32Module, STATUS) & AM_REG_IOMSTR_STATUS_ERR_ERROR ) { // // The IOM is currently indicating an error condition. // Let's figure out what is going on. // ui32intstat = AM_REGn(IOMSTR, ui32Module, INTSTAT); // // Filter out non-error bits. // ui32intstat &= AM_REG_IOMSTR_INTSTAT_ARB_M | AM_REG_IOMSTR_INTSTAT_START_M | AM_REG_IOMSTR_INTSTAT_ICMD_M | AM_REG_IOMSTR_INTSTAT_IACC_M | AM_REG_IOMSTR_INTSTAT_NAK_M | AM_REG_IOMSTR_INTSTAT_FOVFL_M | AM_REG_IOMSTR_INTSTAT_FUNDFL_M; } return ui32intstat; } //***************************************************************************** // //! @brief Service interrupts from the IOM. //! //! @param ui32Status is the IOM interrupt status as returned from //! am_hal_iom_int_status_get() //! //! This function performs the necessary operations to facilitate non-blocking //! IOM writes and reads. //! //! @return None. // //***************************************************************************** void am_hal_iom_int_service(uint32_t ui32Module, uint32_t ui32Status) { am_hal_iom_nb_buffer *psBuffer; uint32_t ui32NumBytes; uint32_t ui32SpaceInFifo; uint32_t thresh; // // Validate parameters // if ( ui32Module >= AM_REG_IOMSTR_NUM_MODULES ) { return; } // // Find the buffer information for the chosen IOM module. // psBuffer = &g_psIOMBuffers[ui32Module]; // // Figure out what type of interrupt this was. // if ( ui32Status & AM_HAL_IOM_INT_CMDCMP ) { // // Need to mark IOM Free // g_bIomBusy[ui32Module] = false; // // If we're not in the middle of a non-blocking call right now, there's // nothing for this routine to do. // if ( psBuffer->ui32State == BUFFER_IDLE ) { return; } // // If a command just completed, we need to transfer all available data. // if ( psBuffer->ui32State == BUFFER_RECEIVING ) { // // If we were receiving, we need to copy any remaining data out of // the IOM FIFO before calling the callback. // ui32NumBytes = am_hal_iom_fifo_full_slots(ui32Module); am_hal_iom_fifo_read(ui32Module, psBuffer->pui32Data, ui32NumBytes); } // // A command complete event also means that we've already transferred // all of the data we need, so we can mark the data buffer as IDLE. // psBuffer->ui32State = BUFFER_IDLE; // // If we have a callback, call it now. // if ( psBuffer->pfnCallback ) { psBuffer->pfnCallback(); } } else if ( ui32Status & AM_HAL_IOM_INT_THR ) { // // If we're not in the middle of a non-blocking call right now, there's // nothing for this routine to do. // if ( psBuffer->ui32State == BUFFER_IDLE ) { return; } // // If we received a threshold event in the middle of a command, we need // to transfer data. // if ( psBuffer->ui32State == BUFFER_SENDING ) { thresh = AM_BFRn(IOMSTR, ui32Module, FIFOTHR, FIFOWTHR); do { ui32SpaceInFifo = am_hal_iom_fifo_empty_slots(ui32Module); // // Figure out how much data we can send. // if ( psBuffer->ui32BytesLeft <= ui32SpaceInFifo ) { // // If the whole transfer will fit in the fifo, send it all. // ui32NumBytes = psBuffer->ui32BytesLeft; } else { // // If the transfer won't fit in the fifo completely, send as // much as we can (rounded down to a multiple of four bytes). // ui32NumBytes = ui32SpaceInFifo; } // // Perform the transfer. // am_hal_iom_fifo_write(ui32Module, psBuffer->pui32Data, ui32NumBytes); // Clear any spurious THR interrupt that might have got raised // while we were adding data to FIFO AM_BFWn(IOMSTR, ui32Module, INTCLR, THR, 1); // // Update the pointer and the byte counter. // psBuffer->ui32BytesLeft -= ui32NumBytes; psBuffer->pui32Data += (ui32NumBytes / 4); if ( 0 == psBuffer->ui32BytesLeft ) { // // Done with this transaction // break; } } while ( am_hal_iom_fifo_full_slots(ui32Module) <= thresh ); } else { thresh = AM_BFRn(IOMSTR, ui32Module, FIFOTHR, FIFORTHR); while ( (ui32NumBytes = am_hal_iom_fifo_full_slots(ui32Module)) >= thresh ) { // // If we get here, we're in the middle of a read. Transfer as much // data as possible out of the FIFO and into our buffer. // if ( ui32NumBytes == psBuffer->ui32BytesLeft ) { // // If the fifo contains our entire message, just copy the whole // thing out. // am_hal_iom_fifo_read(ui32Module, psBuffer->pui32Data, psBuffer->ui32BytesLeft); break; } else if ( ui32NumBytes >= 4 ) { // // If the fifo has at least one 32-bit word in it, copy out the // biggest block we can. // ui32NumBytes = (ui32NumBytes & (~0x3)); am_hal_iom_fifo_read(ui32Module, psBuffer->pui32Data, ui32NumBytes); // // Update the pointer and the byte counter. // psBuffer->ui32BytesLeft -= ui32NumBytes; psBuffer->pui32Data += (ui32NumBytes / 4); // Clear any spurious THR interrupt that might have got raised // while we were reading the data from FIFO AM_BFWn(IOMSTR, ui32Module, INTCLR, THR, 1); } } } } } //***************************************************************************** // //! @brief Initialize the IOM queue system. //! //! @param ui32Module - IOM module to be initialized for queue transfers. //! @param psQueueMemory - Memory to be used for queueing IOM transfers. //! @param ui32QueueMemSize - Size of the queue memory. //! //! This function prepares the selected IOM interface for use with the IOM //! queue system. The IOM queue system allows the caller to start multiple IOM //! transfers in a non-blocking way. In order to do this, the HAL requires some //! amount of memory dedicated to keeping track of IOM transactions before they //! can be sent to the hardware registers. This function tells the HAL what //! memory it should use for this purpose. For more information on the IOM //! queue interface, please see the documentation for //! am_hal_iom_queue_spi_write(). //! //! @note This function only needs to be called once (per module), but it must //! be called before any other am_hal_iom_queue function. //! //! @note Each IOM module will need its own working space. If you intend to use //! the queueing mechanism with more than one IOM module, you will need to //! provide separate queue memory for each module. //! //! Example usage: //! //! @code //! //! // //! // Declare an array to be used for IOM queue transactions. This array will //! // be big enough to handle 32 IOM transactions. //! // //! am_hal_iom_queue_entry_t g_psQueueMemory[32]; //! //! // //! // Attach the IOM0 queue system to the memory we just allocated. //! // //! am_hal_iom_queue_init(0, g_psQueueMemory, sizeof(g_psQueueMemory)); //! //! @endcode // //***************************************************************************** void am_hal_iom_queue_init(uint32_t ui32Module, am_hal_iom_queue_entry_t *psQueueMemory, uint32_t ui32QueueMemSize) { // // Validate parameters // if ( ui32Module >= AM_REG_IOMSTR_NUM_MODULES ) { return; } am_hal_queue_init(&g_psIOMQueue[ui32Module], psQueueMemory, sizeof(am_hal_iom_queue_entry_t), ui32QueueMemSize); } //***************************************************************************** // //! @brief Check to see how many transactions are in the queue. //! //! @param ui32Module Module number for the queue to check //! //! This function will check to see how many transactions are in the IOM queue //! for the selected IOM module. //! //! @return Number of transactions in the queue. // //***************************************************************************** uint32_t am_hal_iom_queue_length_get(uint32_t ui32Module) { // // Validate parameters // if ( ui32Module >= AM_REG_IOMSTR_NUM_MODULES ) { return 0; } return am_hal_queue_data_left(&g_psIOMQueue[ui32Module]); } //***************************************************************************** // //! @brief Executes the next operation in the IOM queue. //! //! @param ui32ModuleNum - Module number for the IOM to use. //! //! This function checks the IOM queue to see if there are any remaining //! transactions. If so, it will start the next available transaction in a //! non-blocking way. //! //! @note This function is called automatically by am_hal_iom_queue_service(). //! You should not call this function standalone in a normal application. // //***************************************************************************** void am_hal_iom_queue_start_next_msg(uint32_t ui32Module) { am_hal_iom_queue_entry_t sIOMTransaction = {0}; uint32_t ui32ChipSelect; uint32_t *pui32Data; uint32_t ui32NumBytes; uint32_t ui32Options; am_hal_iom_callback_t pfnCallback; uint32_t ui32Critical; // // Validate parameters // if ( ui32Module >= AM_REG_IOMSTR_NUM_MODULES ) { return; } // // Start a critical section. // ui32Critical = am_hal_interrupt_master_disable(); // // Try to get the next IOM operation from the queue. // if ( am_hal_queue_item_get(&g_psIOMQueue[ui32Module], &sIOMTransaction, 1) ) { // // Read the operation parameters // ui32ChipSelect = sIOMTransaction.ui32ChipSelect; pui32Data = sIOMTransaction.pui32Data; ui32NumBytes = sIOMTransaction.ui32NumBytes; ui32Options = sIOMTransaction.ui32Options; pfnCallback = sIOMTransaction.pfnCallback; // // Figure out if this was a SPI or I2C write or read, and call the // appropriate non-blocking function. // switch ( sIOMTransaction.ui32Operation ) { case AM_HAL_IOM_QUEUE_SPI_WRITE: am_hal_iom_spi_write_nb(ui32Module, ui32ChipSelect, pui32Data, ui32NumBytes, ui32Options, pfnCallback); break; case AM_HAL_IOM_QUEUE_SPI_READ: am_hal_iom_spi_read_nb(ui32Module, ui32ChipSelect, pui32Data, ui32NumBytes, ui32Options, pfnCallback); break; case AM_HAL_IOM_QUEUE_I2C_WRITE: am_hal_iom_i2c_write_nb(ui32Module, ui32ChipSelect, pui32Data, ui32NumBytes, ui32Options, pfnCallback); break; case AM_HAL_IOM_QUEUE_I2C_READ: am_hal_iom_i2c_read_nb(ui32Module, ui32ChipSelect, pui32Data, ui32NumBytes, ui32Options, pfnCallback); break; } } // // Exit the critical section. // am_hal_interrupt_master_set(ui32Critical); } //***************************************************************************** // //! @brief Send a SPI frame using the IOM queue. //! //! @param ui32Module - Module number for the IOM //! @param ui32ChipSelect - Chip-select number for this transaction. //! @param pui32Data - Pointer to the bytes that will be sent. //! @param ui32NumBytes - Number of bytes to send. //! @param ui32Options - Additional SPI transfer options. //! //! This function performs SPI writes to a selected SPI device. //! //! This function call is a queued implementation. It will write as much //! data to the FIFO as possible immediately, store a pointer to the remaining //! data, start the transfer on the bus, and then immediately return. If the //! FIFO is already in use, this function will save its arguments to the IOM //! queue and execute the transaction when the FIFO becomes available. //! //! The caller will need to make sure that \e am_hal_iom_queue_service() is //! called for IOM FIFO interrupt events and "command complete" interrupt //! events. The \e am_hal_iom_queue_service() function will refill the FIFO as //! necessary and call the \e pfnCallback function when the transaction is //! finished. //! //! @note The actual SPI and I2C interfaces operate in BYTES, not 32-bit words. //! This means that you will need to byte-pack the \e pui32Data array with the //! data you intend to send over the interface. One easy way to do this is to //! declare the array as a 32-bit integer array, but use an 8-bit pointer to //! put your actual data into the array. If there are not enough bytes in your //! desired message to completely fill the last 32-bit word, you may pad that //! last word with bytes of any value. The IOM hardware will only read the //! first \e ui32NumBytes in the \e pui8Data array. // //***************************************************************************** void am_hal_iom_queue_spi_write(uint32_t ui32Module, uint32_t ui32ChipSelect, uint32_t *pui32Data, uint32_t ui32NumBytes, uint32_t ui32Options, am_hal_iom_callback_t pfnCallback) { uint32_t ui32Critical; // // Validate parameters // if ( ui32Module >= AM_REG_IOMSTR_NUM_MODULES ) { return; } am_hal_debug_assert_msg(ui32NumBytes > 0, "Trying to do a 0 byte transaction"); // // Start a critical section. // ui32Critical = am_hal_interrupt_master_disable(); // // Check to see if we need to use the queue. If the IOM is idle, and // there's nothing in the queue already, we can go ahead and start the // transaction in the physical IOM. Need to check for the g_bIomBusy to // avoid a race condition where IDLE is set - but the command complete // for previous transaction has not been processed yet // if ( (g_bIomBusy[ui32Module] == false) && am_hal_queue_empty(&g_psIOMQueue[ui32Module]) ) { // // Send the packet. // am_hal_iom_spi_write_nb(ui32Module, ui32ChipSelect, pui32Data, ui32NumBytes, ui32Options, pfnCallback); } else { // // Otherwise, we'll build a transaction structure and add it to the queue. // am_hal_iom_queue_entry_t sIOMTransaction; sIOMTransaction.ui32Operation = AM_HAL_IOM_QUEUE_SPI_WRITE; sIOMTransaction.ui32Module = ui32Module; sIOMTransaction.ui32ChipSelect = ui32ChipSelect; sIOMTransaction.pui32Data = pui32Data; sIOMTransaction.ui32NumBytes = ui32NumBytes; sIOMTransaction.ui32Options = ui32Options; sIOMTransaction.pfnCallback = pfnCallback; // // Make sure the item actually makes it into the queue // if ( am_hal_queue_item_add(&g_psIOMQueue[ui32Module], &sIOMTransaction, 1) == false ) { // // Didn't have enough memory. // am_hal_debug_assert_msg(0, "The IOM queue is full. Allocate more" "memory to the IOM queue, or allow it more" "time to empty between transactions."); } } // // Exit the critical section. // am_hal_interrupt_master_set(ui32Critical); } //***************************************************************************** // //! @brief Read a SPI frame using the IOM queue. //! //! @param ui32Module - Module number for the IOM //! @param ui32ChipSelect - Chip select number for this transaction. //! @param pui32Data - Pointer to the array where received bytes should go. //! @param ui32NumBytes - Number of bytes to read. //! @param ui32Options - Additional SPI transfer options. //! //! This function performs SPI reads to a selected SPI device. //! //! This function call is a queued implementation. It will write as much //! data to the FIFO as possible immediately, store a pointer to the remaining //! data, start the transfer on the bus, and then immediately return. If the //! FIFO is already in use, this function will save its arguments to the IOM //! queue and execute the transaction when the FIFO becomes available. //! //! The caller will need to make sure that \e am_hal_iom_queue_service() is //! called for IOM FIFO interrupt events and "command complete" interrupt //! events. The \e am_hal_iom_queue_service() function will empty the FIFO as //! necessary and call the \e pfnCallback function when the transaction is //! finished. //! //! @note The actual SPI and I2C interfaces operate in BYTES, not 32-bit words. //! This means that you will need to byte-pack the \e pui32Data array with the //! data you intend to send over the interface. One easy way to do this is to //! declare the array as a 32-bit integer array, but use an 8-bit pointer to //! put your actual data into the array. If there are not enough bytes in your //! desired message to completely fill the last 32-bit word, you may pad that //! last word with bytes of any value. The IOM hardware will only read the //! first \e ui32NumBytes in the \e pui8Data array. // //***************************************************************************** void am_hal_iom_queue_spi_read(uint32_t ui32Module, uint32_t ui32ChipSelect, uint32_t *pui32Data, uint32_t ui32NumBytes, uint32_t ui32Options, am_hal_iom_callback_t pfnCallback) { uint32_t ui32Critical; // // Validate parameters // if ( ui32Module >= AM_REG_IOMSTR_NUM_MODULES ) { return; } am_hal_debug_assert_msg(ui32NumBytes > 0, "Trying to do a 0 byte transaction"); // Start a critical section. // ui32Critical = am_hal_interrupt_master_disable(); // // Check to see if we need to use the queue. If the IOM is idle, and // there's nothing in the queue already, we can go ahead and start the // transaction in the physical IOM. Need to check for the g_bIomBusy to // avoid a race condition where IDLE is set - but the command complete // for previous transaction has not been processed yet // if ( (g_bIomBusy[ui32Module] == false) && am_hal_queue_empty(&g_psIOMQueue[ui32Module]) ) { // // Send the packet. // am_hal_iom_spi_read_nb(ui32Module, ui32ChipSelect, pui32Data, ui32NumBytes, ui32Options, pfnCallback); } else { // // Otherwise, we'll build a transaction structure and add it to the queue. // am_hal_iom_queue_entry_t sIOMTransaction; sIOMTransaction.ui32Operation = AM_HAL_IOM_QUEUE_SPI_READ; sIOMTransaction.ui32Module = ui32Module; sIOMTransaction.ui32ChipSelect = ui32ChipSelect; sIOMTransaction.pui32Data = pui32Data; sIOMTransaction.ui32NumBytes = ui32NumBytes; sIOMTransaction.ui32Options = ui32Options; sIOMTransaction.pfnCallback = pfnCallback; // // Make sure the item actually makes it into the queue // if ( am_hal_queue_item_add(&g_psIOMQueue[ui32Module], &sIOMTransaction, 1) == false ) { // // Didn't have enough memory. // am_hal_debug_assert_msg(0, "The IOM queue is full. Allocate more" "memory to the IOM queue, or allow it more" "time to empty between transactions."); } } // // Exit the critical section. // am_hal_interrupt_master_set(ui32Critical); } //***************************************************************************** // //! @brief Send an I2C frame using the IOM queue. //! //! @param ui32Module - Module number for the IOM //! @param ui32BusAddress - I2C address of the target device. //! @param pui32Data - Pointer to the bytes that will be sent. //! @param ui32NumBytes - Number of bytes to send. //! @param ui32Options - Additional I2C transfer options. //! //! This function performs I2C writes to a selected I2C device. //! //! This function call is a queued implementation. It will write as much //! data to the FIFO as possible immediately, store a pointer to the remaining //! data, start the transfer on the bus, and then immediately return. If the //! FIFO is already in use, this function will save its arguments to the IOM //! queue and execute the transaction when the FIFO becomes available. //! //! The caller will need to make sure that \e am_hal_iom_queue_service() is //! called for IOM FIFO interrupt events and "command complete" interrupt //! events. The \e am_hal_iom_queue_service() function will refill the FIFO as //! necessary and call the \e pfnCallback function when the transaction is //! finished. //! //! @note The actual SPI and I2C interfaces operate in BYTES, not 32-bit words. //! This means that you will need to byte-pack the \e pui32Data array with the //! data you intend to send over the interface. One easy way to do this is to //! declare the array as a 32-bit integer array, but use an 8-bit pointer to //! put your actual data into the array. If there are not enough bytes in your //! desired message to completely fill the last 32-bit word, you may pad that //! last word with bytes of any value. The IOM hardware will only read the //! first \e ui32NumBytes in the \e pui8Data array. // //***************************************************************************** void am_hal_iom_queue_i2c_write(uint32_t ui32Module, uint32_t ui32BusAddress, uint32_t *pui32Data, uint32_t ui32NumBytes, uint32_t ui32Options, am_hal_iom_callback_t pfnCallback) { uint32_t ui32Critical; // // Validate parameters // if ( ui32Module >= AM_REG_IOMSTR_NUM_MODULES ) { return; } am_hal_debug_assert_msg(ui32NumBytes > 0, "Trying to do a 0 byte transaction"); // // Start a critical section. // ui32Critical = am_hal_interrupt_master_disable(); // // Check to see if we need to use the queue. If the IOM is idle, and // there's nothing in the queue already, we can go ahead and start the // transaction in the physical IOM. Need to check for the g_bIomBusy to // avoid a race condition where IDLE is set - but the command complete // for previous transaction has not been processed yet // if ( (g_bIomBusy[ui32Module] == false) && am_hal_queue_empty(&g_psIOMQueue[ui32Module]) ) { // // Send the packet. // am_hal_iom_i2c_write_nb(ui32Module, ui32BusAddress, pui32Data, ui32NumBytes, ui32Options, pfnCallback); } else { // // Otherwise, we'll build a transaction structure and add it to the queue. // am_hal_iom_queue_entry_t sIOMTransaction; sIOMTransaction.ui32Operation = AM_HAL_IOM_QUEUE_I2C_WRITE; sIOMTransaction.ui32Module = ui32Module; sIOMTransaction.ui32ChipSelect = ui32BusAddress; sIOMTransaction.pui32Data = pui32Data; sIOMTransaction.ui32NumBytes = ui32NumBytes; sIOMTransaction.ui32Options = ui32Options; sIOMTransaction.pfnCallback = pfnCallback; // // Make sure the item actually makes it into the queue // if ( am_hal_queue_item_add(&g_psIOMQueue[ui32Module], &sIOMTransaction, 1) == false ) { // // Didn't have enough memory. // am_hal_debug_assert_msg(0, "The IOM queue is full. Allocate more" "memory to the IOM queue, or allow it more" "time to empty between transactions."); } } // // Exit the critical section. // am_hal_interrupt_master_set(ui32Critical); } //***************************************************************************** // //! @brief Read a I2C frame using the IOM queue. //! //! @param ui32Module - Module number for the IOM //! @param ui32BusAddress - I2C address of the target device. //! @param pui32Data - Pointer to the array where received bytes should go. //! @param ui32NumBytes - Number of bytes to read. //! @param ui32Options - Additional I2C transfer options. //! //! This function performs I2C reads to a selected I2C device. //! //! This function call is a queued implementation. It will write as much //! data to the FIFO as possible immediately, store a pointer to the remaining //! data, start the transfer on the bus, and then immediately return. If the //! FIFO is already in use, this function will save its arguments to the IOM //! queue and execute the transaction when the FIFO becomes available. //! //! The caller will need to make sure that \e am_hal_iom_queue_service() is //! called for IOM FIFO interrupt events and "command complete" interrupt //! events. The \e am_hal_iom_queue_service() function will empty the FIFO as //! necessary and call the \e pfnCallback function when the transaction is //! finished. //! //! @note The actual SPI and I2C interfaces operate in BYTES, not 32-bit words. //! This means that you will need to byte-pack the \e pui32Data array with the //! data you intend to send over the interface. One easy way to do this is to //! declare the array as a 32-bit integer array, but use an 8-bit pointer to //! put your actual data into the array. If there are not enough bytes in your //! desired message to completely fill the last 32-bit word, you may pad that //! last word with bytes of any value. The IOM hardware will only read the //! first \e ui32NumBytes in the \e pui8Data array. // //***************************************************************************** void am_hal_iom_queue_i2c_read(uint32_t ui32Module, uint32_t ui32BusAddress, uint32_t *pui32Data, uint32_t ui32NumBytes, uint32_t ui32Options, am_hal_iom_callback_t pfnCallback) { uint32_t ui32Critical; // // Validate parameters // if ( ui32Module >= AM_REG_IOMSTR_NUM_MODULES ) { return; } am_hal_debug_assert_msg(ui32NumBytes > 0, "Trying to do a 0 byte transaction"); // // Start a critical section. // ui32Critical = am_hal_interrupt_master_disable(); // // Check to see if we need to use the queue. If the IOM is idle, and // there's nothing in the queue already, we can go ahead and start the // transaction in the physical IOM. Need to check for the g_bIomBusy to // avoid a race condition where IDLE is set - but the command complete // for previous transaction has not been processed yet // if ( (g_bIomBusy[ui32Module] == false) && am_hal_queue_empty(&g_psIOMQueue[ui32Module]) ) { // // Send the packet. // am_hal_iom_i2c_read_nb(ui32Module, ui32BusAddress, pui32Data, ui32NumBytes, ui32Options, pfnCallback); } else { // // Otherwise, we'll build a transaction structure and add it to the queue. // am_hal_iom_queue_entry_t sIOMTransaction; sIOMTransaction.ui32Operation = AM_HAL_IOM_QUEUE_I2C_READ; sIOMTransaction.ui32Module = ui32Module; sIOMTransaction.ui32ChipSelect = ui32BusAddress; sIOMTransaction.pui32Data = pui32Data; sIOMTransaction.ui32NumBytes = ui32NumBytes; sIOMTransaction.ui32Options = ui32Options; sIOMTransaction.pfnCallback = pfnCallback; // // Make sure the item actually makes it into the queue // if ( am_hal_queue_item_add(&g_psIOMQueue[ui32Module], &sIOMTransaction, 1) == false ) { // // Didn't have enough memory. // am_hal_debug_assert_msg(0, "The IOM queue is full. Allocate more" "memory to the IOM queue, or allow it more" "time to empty between transactions."); } } // // Exit the critical section. // am_hal_interrupt_master_set(ui32Critical); } //***************************************************************************** // //! @brief "Block" until the queue of IOM transactions is over. //! //! @param ui32Module - Module number for the IOM. //! //! This function will sleep the core block until the queue for the selected //! IOM is empty. This is mainly useful for non-RTOS applications where the //! caller needs to know that a certain IOM transaction is complete before //! continuing with the main program flow. //! //! @note This function will put the core to sleep while it waits for the //! queued IOM transactions to complete. This will save power, in most //! situations, but it may not be the best option in all cases. \e Do \e not //! call this function from interrupt context (the core may not wake up again). //! \e Be \e careful using this function from an RTOS task (many RTOS //! implementations use hardware interrupts to switch contexts, and most RTOS //! implementations expect to control sleep behavior). // //***************************************************************************** void am_hal_iom_sleeping_queue_flush(uint32_t ui32Module) { bool bWaiting = true; uint32_t ui32Critical; // // Validate parameters // if ( ui32Module >= AM_REG_IOMSTR_NUM_MODULES ) { return; } // // Loop forever waiting for the IOM to be idle and the queue to be empty. // while ( bWaiting ) { // // Start a critical section. // ui32Critical = am_hal_interrupt_master_disable(); // // Check the queue and the IOM itself. // if ( (g_bIomBusy[ui32Module] == false) && am_hal_queue_empty(&g_psIOMQueue[ui32Module]) ) { // // If the queue is empty and the IOM is idle, we can go ahead and // return. // bWaiting = false; } else { // // Otherwise, we should sleep until the interface is actually free. // am_hal_sysctrl_sleep(AM_HAL_SYSCTRL_SLEEP_NORMAL); } // // End the critical section. // am_hal_interrupt_master_set(ui32Critical); } } //***************************************************************************** // //! @brief Service IOM transaction queue. //! //! @param ui32Module - Module number for the IOM to be used. //! @param ui32Status - Interrupt status bits for the IOM module being used. //! //! This function handles the operation of FIFOs and the IOM queue during //! queued IOM transactions. If you are using \e am_hal_iom_queue_spi_write() //! or similar functions, you will need to call this function in your interrupt //! handler. //! //! @note This interrupt service routine relies on the user to enable the IOM //! interrupts for FIFO threshold and CMD complete. //! //! Example: //! //! @code //! void //! am_iomaster0_isr(void) //! { //! uint32_t ui32Status; //! //! // //! // Check to see which interrupt caused us to enter the ISR. //! // //! ui32Status = am_hal_iom_int_status(0, true); //! //! // //! // Fill or empty the FIFO, and either continue the current operation or //! // start the next one in the queue. If there was a callback, it will be //! // called here. //! // //! am_hal_iom_queue_service(0, ui32Status); //! //! // //! // Clear the interrupts before leaving the ISR. //! // //! am_hal_iom_int_clear(ui32Status); //! } //! @endcode //! //! @return // //***************************************************************************** void am_hal_iom_queue_service(uint32_t ui32Module, uint32_t ui32Status) { // // Validate parameters // if ( ui32Module >= AM_REG_IOMSTR_NUM_MODULES ) { return; } // // Service the FIFOs in case this was a threshold interrupt. // am_hal_iom_int_service(ui32Module, ui32Status); // // If the last interrupt was a "command complete", then the IOM should be // idle already or very soon. Make absolutely sure that the IOM is not in // use, and then start the next transaction in the queue. // if ( ui32Status & AM_HAL_IOM_INT_CMDCMP ) { if ( g_psIOMQueue[ui32Module].pui8Data != NULL ) { am_hal_iom_queue_start_next_msg(ui32Module); } } } //***************************************************************************** // //! @brief Enable selected IOM Interrupts. //! //! @param ui32Module - Module number. //! @param ui32Interrupt - Use the macro bit fields provided in am_hal_iom.h //! //! Use this function to enable the IOM interrupts. //! //! @return None // //***************************************************************************** void am_hal_iom_int_enable(uint32_t ui32Module, uint32_t ui32Interrupt) { // // Validate parameters // if ( ui32Module >= AM_REG_IOMSTR_NUM_MODULES ) { return; } AM_REGn(IOMSTR, ui32Module, INTEN) |= ui32Interrupt; } //***************************************************************************** // //! @brief Return the enabled IOM Interrupts. //! //! @param ui32Module - Module number. //! //! Use this function to return all enabled IOM interrupts. //! //! @return all enabled IOM interrupts. // //***************************************************************************** uint32_t am_hal_iom_int_enable_get(uint32_t ui32Module) { // // Validate parameters // if ( ui32Module >= AM_REG_IOMSTR_NUM_MODULES ) { return 0; } return AM_REGn(IOMSTR, ui32Module, INTEN); } //***************************************************************************** // //! @brief Disable selected IOM Interrupts. //! //! @param ui32Module - Module number. //! @param ui32Interrupt - Use the macro bit fields provided in am_hal_iom.h //! //! Use this function to disable the IOM interrupts. //! //! @return None // //***************************************************************************** void am_hal_iom_int_disable(uint32_t ui32Module, uint32_t ui32Interrupt) { // // Validate parameters // if ( ui32Module >= AM_REG_IOMSTR_NUM_MODULES ) { return; } AM_REGn(IOMSTR, ui32Module, INTEN) &= ~ui32Interrupt; } //***************************************************************************** // //! @brief Clear selected IOM Interrupts. //! //! @param ui32Module - Module number. //! @param ui32Interrupt - Use the macro bit fields provided in am_hal_iom.h //! //! Use this function to clear the IOM interrupts. //! //! @return None // //***************************************************************************** void am_hal_iom_int_clear(uint32_t ui32Module, uint32_t ui32Interrupt) { // // Validate parameters // if ( ui32Module >= AM_REG_IOMSTR_NUM_MODULES ) { return; } AM_REGn(IOMSTR, ui32Module, INTCLR) = ui32Interrupt; } //***************************************************************************** // //! @brief Set selected IOM Interrupts. //! //! @param ui32Module - Module number. //! @param ui32Interrupt - Use the macro bit fields provided in am_hal_iom.h //! //! Use this function to set the IOM interrupts. //! //! @return None // //***************************************************************************** void am_hal_iom_int_set(uint32_t ui32Module, uint32_t ui32Interrupt) { // // Validate parameters // if ( ui32Module >= AM_REG_IOMSTR_NUM_MODULES ) { return; } AM_REGn(IOMSTR, ui32Module, INTSET) = ui32Interrupt; } //***************************************************************************** // //! @brief Return the IOM Interrupt status. //! //! @param ui32Module - Module number. //! @param bEnabledOnly - return only the enabled interrupts. //! //! Use this function to get the IOM interrupt status. //! //! @return interrupt status // //***************************************************************************** uint32_t am_hal_iom_int_status_get(uint32_t ui32Module, bool bEnabledOnly) { // // Validate parameters // if ( ui32Module >= AM_REG_IOMSTR_NUM_MODULES ) { return 0; } if ( bEnabledOnly ) { uint32_t u32RetVal = AM_REGn(IOMSTR, ui32Module, INTSTAT); return u32RetVal & AM_REGn(IOMSTR, ui32Module, INTEN); } else { return AM_REGn(IOMSTR, ui32Module, INTSTAT); } } //***************************************************************************** // // End Doxygen group. //! @} // //*****************************************************************************