2234 lines
74 KiB
C
2234 lines
74 KiB
C
/*
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* Copyright (c) 2015, Freescale Semiconductor, Inc.
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* Copyright 2016-2017 NXP
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* All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include "fsl_lpi2c.h"
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#include <stdlib.h>
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#include <string.h>
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/*******************************************************************************
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* Definitions
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******************************************************************************/
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/* Component ID definition, used by tools. */
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#ifndef FSL_COMPONENT_ID
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#define FSL_COMPONENT_ID "platform.drivers.lpi2c"
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#endif
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/*! @brief Common sets of flags used by the driver. */
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enum _lpi2c_flag_constants
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{
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/*! All flags which are cleared by the driver upon starting a transfer. */
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kMasterClearFlags = kLPI2C_MasterEndOfPacketFlag | kLPI2C_MasterStopDetectFlag | kLPI2C_MasterNackDetectFlag |
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kLPI2C_MasterArbitrationLostFlag | kLPI2C_MasterFifoErrFlag | kLPI2C_MasterPinLowTimeoutFlag |
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kLPI2C_MasterDataMatchFlag,
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/*! IRQ sources enabled by the non-blocking transactional API. */
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kMasterIrqFlags = kLPI2C_MasterArbitrationLostFlag | kLPI2C_MasterTxReadyFlag | kLPI2C_MasterRxReadyFlag |
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kLPI2C_MasterStopDetectFlag | kLPI2C_MasterNackDetectFlag | kLPI2C_MasterPinLowTimeoutFlag |
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kLPI2C_MasterFifoErrFlag,
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/*! Errors to check for. */
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kMasterErrorFlags = kLPI2C_MasterNackDetectFlag | kLPI2C_MasterArbitrationLostFlag | kLPI2C_MasterFifoErrFlag |
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kLPI2C_MasterPinLowTimeoutFlag,
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/*! All flags which are cleared by the driver upon starting a transfer. */
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kSlaveClearFlags = kLPI2C_SlaveRepeatedStartDetectFlag | kLPI2C_SlaveStopDetectFlag | kLPI2C_SlaveBitErrFlag |
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kLPI2C_SlaveFifoErrFlag,
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/*! IRQ sources enabled by the non-blocking transactional API. */
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kSlaveIrqFlags = kLPI2C_SlaveTxReadyFlag | kLPI2C_SlaveRxReadyFlag | kLPI2C_SlaveStopDetectFlag |
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kLPI2C_SlaveRepeatedStartDetectFlag | kLPI2C_SlaveFifoErrFlag | kLPI2C_SlaveBitErrFlag |
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kLPI2C_SlaveTransmitAckFlag | kLPI2C_SlaveAddressValidFlag,
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/*! Errors to check for. */
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kSlaveErrorFlags = kLPI2C_SlaveFifoErrFlag | kLPI2C_SlaveBitErrFlag,
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};
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/* ! @brief LPI2C master fifo commands. */
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enum _lpi2c_master_fifo_cmd
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{
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kTxDataCmd = LPI2C_MTDR_CMD(0x0U), /*!< Transmit DATA[7:0] */
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kRxDataCmd = LPI2C_MTDR_CMD(0X1U), /*!< Receive (DATA[7:0] + 1) bytes */
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kStopCmd = LPI2C_MTDR_CMD(0x2U), /*!< Generate STOP condition */
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kStartCmd = LPI2C_MTDR_CMD(0x4U), /*!< Generate(repeated) START and transmit address in DATA[[7:0] */
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};
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/*!
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* @brief Default watermark values.
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*
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* The default watermarks are set to zero.
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*/
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enum _lpi2c_default_watermarks
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{
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kDefaultTxWatermark = 0,
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kDefaultRxWatermark = 0,
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};
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/*! @brief States for the state machine used by transactional APIs. */
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enum _lpi2c_transfer_states
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{
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kIdleState = 0,
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kSendCommandState,
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kIssueReadCommandState,
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kTransferDataState,
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kStopState,
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kWaitForCompletionState,
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};
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/*! @brief Typedef for master interrupt handler. */
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typedef void (*lpi2c_master_isr_t)(LPI2C_Type *base, lpi2c_master_handle_t *handle);
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/*! @brief Typedef for slave interrupt handler. */
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typedef void (*lpi2c_slave_isr_t)(LPI2C_Type *base, lpi2c_slave_handle_t *handle);
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/*******************************************************************************
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* Prototypes
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******************************************************************************/
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/* Not static so it can be used from fsl_lpi2c_edma.c. */
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uint32_t LPI2C_GetInstance(LPI2C_Type *base);
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static uint32_t LPI2C_GetCyclesForWidth(uint32_t sourceClock_Hz,
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uint32_t width_ns,
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uint32_t maxCycles,
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uint32_t prescaler);
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static status_t LPI2C_MasterWaitForTxReady(LPI2C_Type *base);
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static status_t LPI2C_RunTransferStateMachine(LPI2C_Type *base, lpi2c_master_handle_t *handle, bool *isDone);
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static void LPI2C_InitTransferStateMachine(lpi2c_master_handle_t *handle);
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static status_t LPI2C_SlaveCheckAndClearError(LPI2C_Type *base, uint32_t flags);
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static void LPI2C_CommonIRQHandler(LPI2C_Type *base, uint32_t instance);
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/*******************************************************************************
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* Variables
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******************************************************************************/
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/*! @brief Array to map LPI2C instance number to base pointer. */
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static LPI2C_Type *const kLpi2cBases[] = LPI2C_BASE_PTRS;
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/*! @brief Array to map LPI2C instance number to IRQ number. */
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static IRQn_Type const kLpi2cIrqs[] = LPI2C_IRQS;
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#if !(defined(FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL) && FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL)
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/*! @brief Array to map LPI2C instance number to clock gate enum. */
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static clock_ip_name_t const kLpi2cClocks[] = LPI2C_CLOCKS;
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#if defined(LPI2C_PERIPH_CLOCKS)
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/*! @brief Array to map LPI2C instance number to pheripheral clock gate enum. */
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static const clock_ip_name_t kLpi2cPeriphClocks[] = LPI2C_PERIPH_CLOCKS;
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#endif
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#endif /* FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL */
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/*! @brief Pointer to master IRQ handler for each instance. */
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static lpi2c_master_isr_t s_lpi2cMasterIsr;
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/*! @brief Pointers to master handles for each instance. */
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static lpi2c_master_handle_t *s_lpi2cMasterHandle[ARRAY_SIZE(kLpi2cBases)];
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/*! @brief Pointer to slave IRQ handler for each instance. */
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static lpi2c_slave_isr_t s_lpi2cSlaveIsr;
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/*! @brief Pointers to slave handles for each instance. */
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static lpi2c_slave_handle_t *s_lpi2cSlaveHandle[ARRAY_SIZE(kLpi2cBases)];
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/*******************************************************************************
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* Code
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******************************************************************************/
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/*!
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* @brief Returns an instance number given a base address.
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*
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* If an invalid base address is passed, debug builds will assert. Release builds will just return
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* instance number 0.
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*
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* @param base The LPI2C peripheral base address.
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* @return LPI2C instance number starting from 0.
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*/
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uint32_t LPI2C_GetInstance(LPI2C_Type *base)
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{
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uint32_t instance;
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for (instance = 0; instance < ARRAY_SIZE(kLpi2cBases); ++instance)
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{
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if (kLpi2cBases[instance] == base)
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{
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return instance;
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}
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}
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assert(false);
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return 0;
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}
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/*!
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* @brief Computes a cycle count for a given time in nanoseconds.
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* @param sourceClock_Hz LPI2C functional clock frequency in Hertz.
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* @param width_ns Desired with in nanoseconds.
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* @param maxCycles Maximum cycle count, determined by the number of bits wide the cycle count field is.
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* @param prescaler LPI2C prescaler setting. Pass 1 if the prescaler should not be used, as for slave glitch widths.
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*/
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static uint32_t LPI2C_GetCyclesForWidth(uint32_t sourceClock_Hz,
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uint32_t width_ns,
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uint32_t maxCycles,
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uint32_t prescaler)
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{
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assert(sourceClock_Hz > 0);
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assert(prescaler > 0);
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uint32_t busCycle_ns = 1000000 / (sourceClock_Hz / prescaler / 1000);
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uint32_t cycles = 0;
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/* Search for the cycle count just below the desired glitch width. */
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while ((((cycles + 1) * busCycle_ns) < width_ns) && (cycles + 1 < maxCycles))
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{
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++cycles;
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}
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/* If we end up with zero cycles, then set the filter to a single cycle unless the */
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/* bus clock is greater than 10x the desired glitch width. */
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if ((cycles == 0) && (busCycle_ns <= (width_ns * 10)))
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{
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cycles = 1;
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}
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return cycles;
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}
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/*!
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* @brief Convert provided flags to status code, and clear any errors if present.
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* @param base The LPI2C peripheral base address.
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* @param status Current status flags value that will be checked.
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* @retval #kStatus_Success
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* @retval #kStatus_LPI2C_PinLowTimeout
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* @retval #kStatus_LPI2C_ArbitrationLost
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* @retval #kStatus_LPI2C_Nak
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* @retval #kStatus_LPI2C_FifoError
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*/
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/* Not static so it can be used from fsl_lpi2c_edma.c. */
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status_t LPI2C_MasterCheckAndClearError(LPI2C_Type *base, uint32_t status)
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{
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status_t result = kStatus_Success;
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/* Check for error. These errors cause a stop to automatically be sent. We must */
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/* clear the errors before a new transfer can start. */
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status &= kMasterErrorFlags;
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if (status)
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{
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/* Select the correct error code. Ordered by severity, with bus issues first. */
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if (status & kLPI2C_MasterPinLowTimeoutFlag)
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{
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result = kStatus_LPI2C_PinLowTimeout;
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}
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else if (status & kLPI2C_MasterArbitrationLostFlag)
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{
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result = kStatus_LPI2C_ArbitrationLost;
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}
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else if (status & kLPI2C_MasterNackDetectFlag)
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{
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result = kStatus_LPI2C_Nak;
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}
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else if (status & kLPI2C_MasterFifoErrFlag)
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{
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result = kStatus_LPI2C_FifoError;
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}
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else
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{
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assert(false);
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}
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/* Clear the flags. */
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LPI2C_MasterClearStatusFlags(base, status);
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/* Reset fifos. These flags clear automatically. */
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base->MCR |= LPI2C_MCR_RRF_MASK | LPI2C_MCR_RTF_MASK;
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}
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return result;
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}
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/*!
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* @brief Wait until there is room in the tx fifo.
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* @param base The LPI2C peripheral base address.
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* @retval #kStatus_Success
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* @retval #kStatus_LPI2C_PinLowTimeout
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* @retval #kStatus_LPI2C_ArbitrationLost
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* @retval #kStatus_LPI2C_Nak
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* @retval #kStatus_LPI2C_FifoError
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*/
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static status_t LPI2C_MasterWaitForTxReady(LPI2C_Type *base)
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{
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uint32_t status;
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size_t txCount;
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size_t txFifoSize = FSL_FEATURE_LPI2C_FIFO_SIZEn(base);
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#if LPI2C_WAIT_TIMEOUT
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uint32_t waitTimes = LPI2C_WAIT_TIMEOUT;
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#endif
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do
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{
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status_t result;
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/* Get the number of words in the tx fifo and compute empty slots. */
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LPI2C_MasterGetFifoCounts(base, NULL, &txCount);
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txCount = txFifoSize - txCount;
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/* Check for error flags. */
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status = LPI2C_MasterGetStatusFlags(base);
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result = LPI2C_MasterCheckAndClearError(base, status);
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if (result)
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{
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return result;
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}
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#if LPI2C_WAIT_TIMEOUT
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} while ((!txCount) && (--waitTimes));
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if (waitTimes == 0)
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{
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return kStatus_LPI2C_Timeout;
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}
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#else
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} while (!txCount);
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#endif
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return kStatus_Success;
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}
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/*!
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* @brief Make sure the bus isn't already busy.
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*
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* A busy bus is allowed if we are the one driving it.
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*
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* @param base The LPI2C peripheral base address.
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* @retval #kStatus_Success
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* @retval #kStatus_LPI2C_Busy
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*/
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/* Not static so it can be used from fsl_lpi2c_edma.c. */
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status_t LPI2C_CheckForBusyBus(LPI2C_Type *base)
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{
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uint32_t status = LPI2C_MasterGetStatusFlags(base);
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if ((status & kLPI2C_MasterBusBusyFlag) && (!(status & kLPI2C_MasterBusyFlag)))
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{
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return kStatus_LPI2C_Busy;
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}
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return kStatus_Success;
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}
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/*!
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* brief Provides a default configuration for the LPI2C master peripheral.
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*
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* This function provides the following default configuration for the LPI2C master peripheral:
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* code
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* masterConfig->enableMaster = true;
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* masterConfig->debugEnable = false;
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* masterConfig->ignoreAck = false;
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* masterConfig->pinConfig = kLPI2C_2PinOpenDrain;
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* masterConfig->baudRate_Hz = 100000U;
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* masterConfig->busIdleTimeout_ns = 0;
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* masterConfig->pinLowTimeout_ns = 0;
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* masterConfig->sdaGlitchFilterWidth_ns = 0;
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* masterConfig->sclGlitchFilterWidth_ns = 0;
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* masterConfig->hostRequest.enable = false;
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* masterConfig->hostRequest.source = kLPI2C_HostRequestExternalPin;
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* masterConfig->hostRequest.polarity = kLPI2C_HostRequestPinActiveHigh;
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* endcode
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*
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* After calling this function, you can override any settings in order to customize the configuration,
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* prior to initializing the master driver with LPI2C_MasterInit().
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*
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* param[out] masterConfig User provided configuration structure for default values. Refer to #lpi2c_master_config_t.
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*/
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void LPI2C_MasterGetDefaultConfig(lpi2c_master_config_t *masterConfig)
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{
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/* Initializes the configure structure to zero. */
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memset(masterConfig, 0, sizeof(*masterConfig));
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masterConfig->enableMaster = true;
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masterConfig->debugEnable = false;
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masterConfig->enableDoze = true;
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masterConfig->ignoreAck = false;
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masterConfig->pinConfig = kLPI2C_2PinOpenDrain;
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masterConfig->baudRate_Hz = 100000U;
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masterConfig->busIdleTimeout_ns = 0;
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masterConfig->pinLowTimeout_ns = 0;
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masterConfig->sdaGlitchFilterWidth_ns = 0;
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masterConfig->sclGlitchFilterWidth_ns = 0;
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masterConfig->hostRequest.enable = false;
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masterConfig->hostRequest.source = kLPI2C_HostRequestExternalPin;
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masterConfig->hostRequest.polarity = kLPI2C_HostRequestPinActiveHigh;
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}
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/*!
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* brief Initializes the LPI2C master peripheral.
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*
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* This function enables the peripheral clock and initializes the LPI2C master peripheral as described by the user
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* provided configuration. A software reset is performed prior to configuration.
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*
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* param base The LPI2C peripheral base address.
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* param masterConfig User provided peripheral configuration. Use LPI2C_MasterGetDefaultConfig() to get a set of
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* defaults
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* that you can override.
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* param sourceClock_Hz Frequency in Hertz of the LPI2C functional clock. Used to calculate the baud rate divisors,
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* filter widths, and timeout periods.
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*/
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void LPI2C_MasterInit(LPI2C_Type *base, const lpi2c_master_config_t *masterConfig, uint32_t sourceClock_Hz)
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{
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uint32_t prescaler;
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uint32_t cycles;
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uint32_t cfgr2;
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uint32_t value;
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#if !(defined(FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL) && FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL)
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uint32_t instance = LPI2C_GetInstance(base);
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/* Ungate the clock. */
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CLOCK_EnableClock(kLpi2cClocks[instance]);
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#if defined(LPI2C_PERIPH_CLOCKS)
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/* Ungate the functional clock in initialize function. */
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CLOCK_EnableClock(kLpi2cPeriphClocks[instance]);
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#endif
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#endif /* FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL */
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/* Reset peripheral before configuring it. */
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LPI2C_MasterReset(base);
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/* Doze bit: 0 is enable, 1 is disable */
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base->MCR = LPI2C_MCR_DBGEN(masterConfig->debugEnable) | LPI2C_MCR_DOZEN(!(masterConfig->enableDoze));
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/* host request */
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value = base->MCFGR0;
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value &= (~(LPI2C_MCFGR0_HREN_MASK | LPI2C_MCFGR0_HRPOL_MASK | LPI2C_MCFGR0_HRSEL_MASK));
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value |= LPI2C_MCFGR0_HREN(masterConfig->hostRequest.enable) |
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LPI2C_MCFGR0_HRPOL(masterConfig->hostRequest.polarity) |
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LPI2C_MCFGR0_HRSEL(masterConfig->hostRequest.source);
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base->MCFGR0 = value;
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/* pin config and ignore ack */
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value = base->MCFGR1;
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value &= ~(LPI2C_MCFGR1_PINCFG_MASK | LPI2C_MCFGR1_IGNACK_MASK);
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value |= LPI2C_MCFGR1_PINCFG(masterConfig->pinConfig);
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value |= LPI2C_MCFGR1_IGNACK(masterConfig->ignoreAck);
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base->MCFGR1 = value;
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LPI2C_MasterSetWatermarks(base, kDefaultTxWatermark, kDefaultRxWatermark);
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LPI2C_MasterSetBaudRate(base, sourceClock_Hz, masterConfig->baudRate_Hz);
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/* Configure glitch filters and bus idle and pin low timeouts. */
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prescaler = (base->MCFGR1 & LPI2C_MCFGR1_PRESCALE_MASK) >> LPI2C_MCFGR1_PRESCALE_SHIFT;
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cfgr2 = base->MCFGR2;
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if (masterConfig->busIdleTimeout_ns)
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{
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cycles = LPI2C_GetCyclesForWidth(sourceClock_Hz, masterConfig->busIdleTimeout_ns,
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(LPI2C_MCFGR2_BUSIDLE_MASK >> LPI2C_MCFGR2_BUSIDLE_SHIFT), prescaler);
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cfgr2 &= ~LPI2C_MCFGR2_BUSIDLE_MASK;
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cfgr2 |= LPI2C_MCFGR2_BUSIDLE(cycles);
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}
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if (masterConfig->sdaGlitchFilterWidth_ns)
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{
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cycles = LPI2C_GetCyclesForWidth(sourceClock_Hz, masterConfig->sdaGlitchFilterWidth_ns,
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(LPI2C_MCFGR2_FILTSDA_MASK >> LPI2C_MCFGR2_FILTSDA_SHIFT), 1);
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cfgr2 &= ~LPI2C_MCFGR2_FILTSDA_MASK;
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cfgr2 |= LPI2C_MCFGR2_FILTSDA(cycles);
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}
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if (masterConfig->sclGlitchFilterWidth_ns)
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{
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cycles = LPI2C_GetCyclesForWidth(sourceClock_Hz, masterConfig->sclGlitchFilterWidth_ns,
|
|
(LPI2C_MCFGR2_FILTSCL_MASK >> LPI2C_MCFGR2_FILTSCL_SHIFT), 1);
|
|
cfgr2 &= ~LPI2C_MCFGR2_FILTSCL_MASK;
|
|
cfgr2 |= LPI2C_MCFGR2_FILTSCL(cycles);
|
|
}
|
|
base->MCFGR2 = cfgr2;
|
|
if (masterConfig->pinLowTimeout_ns)
|
|
{
|
|
cycles = LPI2C_GetCyclesForWidth(sourceClock_Hz, masterConfig->pinLowTimeout_ns / 256,
|
|
(LPI2C_MCFGR2_BUSIDLE_MASK >> LPI2C_MCFGR2_BUSIDLE_SHIFT), prescaler);
|
|
base->MCFGR3 = (base->MCFGR3 & ~LPI2C_MCFGR3_PINLOW_MASK) | LPI2C_MCFGR3_PINLOW(cycles);
|
|
}
|
|
|
|
LPI2C_MasterEnable(base, masterConfig->enableMaster);
|
|
}
|
|
|
|
/*!
|
|
* brief Deinitializes the LPI2C master peripheral.
|
|
*
|
|
* This function disables the LPI2C master peripheral and gates the clock. It also performs a software
|
|
* reset to restore the peripheral to reset conditions.
|
|
*
|
|
* param base The LPI2C peripheral base address.
|
|
*/
|
|
void LPI2C_MasterDeinit(LPI2C_Type *base)
|
|
{
|
|
/* Restore to reset state. */
|
|
LPI2C_MasterReset(base);
|
|
|
|
#if !(defined(FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL) && FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL)
|
|
|
|
uint32_t instance = LPI2C_GetInstance(base);
|
|
|
|
/* Gate clock. */
|
|
CLOCK_DisableClock(kLpi2cClocks[instance]);
|
|
#if defined(LPI2C_PERIPH_CLOCKS)
|
|
/* Gate the functional clock. */
|
|
CLOCK_DisableClock(kLpi2cPeriphClocks[instance]);
|
|
#endif
|
|
|
|
#endif /* FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL */
|
|
}
|
|
|
|
/*!
|
|
* brief Configures LPI2C master data match feature.
|
|
*
|
|
* param base The LPI2C peripheral base address.
|
|
* param config Settings for the data match feature.
|
|
*/
|
|
void LPI2C_MasterConfigureDataMatch(LPI2C_Type *base, const lpi2c_data_match_config_t *config)
|
|
{
|
|
/* Disable master mode. */
|
|
bool wasEnabled = (base->MCR & LPI2C_MCR_MEN_MASK) >> LPI2C_MCR_MEN_SHIFT;
|
|
LPI2C_MasterEnable(base, false);
|
|
|
|
base->MCFGR1 = (base->MCFGR1 & ~LPI2C_MCFGR1_MATCFG_MASK) | LPI2C_MCFGR1_MATCFG(config->matchMode);
|
|
base->MCFGR0 = (base->MCFGR0 & ~LPI2C_MCFGR0_RDMO_MASK) | LPI2C_MCFGR0_RDMO(config->rxDataMatchOnly);
|
|
base->MDMR = LPI2C_MDMR_MATCH0(config->match0) | LPI2C_MDMR_MATCH1(config->match1);
|
|
|
|
/* Restore master mode. */
|
|
if (wasEnabled)
|
|
{
|
|
LPI2C_MasterEnable(base, true);
|
|
}
|
|
}
|
|
|
|
/*!
|
|
* brief Sets the I2C bus frequency for master transactions.
|
|
*
|
|
* The LPI2C master is automatically disabled and re-enabled as necessary to configure the baud
|
|
* rate. Do not call this function during a transfer, or the transfer is aborted.
|
|
*
|
|
* note Please note that the second parameter is the clock frequency of LPI2C module, the third
|
|
* parameter means user configured bus baudrate, this implementation is different from other I2C drivers
|
|
* which use baudrate configuration as second parameter and source clock frequency as third parameter.
|
|
*
|
|
* param base The LPI2C peripheral base address.
|
|
* param sourceClock_Hz LPI2C functional clock frequency in Hertz.
|
|
* param baudRate_Hz Requested bus frequency in Hertz.
|
|
*/
|
|
void LPI2C_MasterSetBaudRate(LPI2C_Type *base, uint32_t sourceClock_Hz, uint32_t baudRate_Hz)
|
|
{
|
|
uint32_t prescale = 0;
|
|
uint32_t bestPre = 0;
|
|
uint32_t bestClkHi = 0;
|
|
uint32_t absError = 0;
|
|
uint32_t bestError = 0xffffffffu;
|
|
uint32_t value;
|
|
uint32_t clkHiCycle;
|
|
uint32_t computedRate;
|
|
int i;
|
|
bool wasEnabled;
|
|
|
|
/* Disable master mode. */
|
|
wasEnabled = (base->MCR & LPI2C_MCR_MEN_MASK) >> LPI2C_MCR_MEN_SHIFT;
|
|
LPI2C_MasterEnable(base, false);
|
|
|
|
/* Baud rate = (sourceClock_Hz/2^prescale)/(CLKLO+1+CLKHI+1 + ROUNDDOWN((2+FILTSCL)/2^prescale) */
|
|
/* Assume CLKLO = 2*CLKHI, SETHOLD = CLKHI, DATAVD = CLKHI/2. */
|
|
for (prescale = 1; (prescale <= 128) && (bestError != 0); prescale = 2 * prescale)
|
|
{
|
|
for (clkHiCycle = 1; clkHiCycle < 32; clkHiCycle++)
|
|
{
|
|
if (clkHiCycle == 1)
|
|
{
|
|
computedRate = (sourceClock_Hz / prescale) / (1 + 3 + 2 + 2 / prescale);
|
|
}
|
|
else
|
|
{
|
|
computedRate = (sourceClock_Hz / prescale) / (3 * clkHiCycle + 2 + 2 / prescale);
|
|
}
|
|
|
|
absError = baudRate_Hz > computedRate ? baudRate_Hz - computedRate : computedRate - baudRate_Hz;
|
|
|
|
if (absError < bestError)
|
|
{
|
|
bestPre = prescale;
|
|
bestClkHi = clkHiCycle;
|
|
bestError = absError;
|
|
|
|
/* If the error is 0, then we can stop searching because we won't find a better match. */
|
|
if (absError == 0)
|
|
{
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Standard, fast, fast mode plus and ultra-fast transfers. */
|
|
value = LPI2C_MCCR0_CLKHI(bestClkHi);
|
|
|
|
if (bestClkHi < 2)
|
|
{
|
|
value |= LPI2C_MCCR0_CLKLO(3) | LPI2C_MCCR0_SETHOLD(2) | LPI2C_MCCR0_DATAVD(1);
|
|
}
|
|
else
|
|
{
|
|
value |= LPI2C_MCCR0_CLKLO(2 * bestClkHi) | LPI2C_MCCR0_SETHOLD(bestClkHi) | LPI2C_MCCR0_DATAVD(bestClkHi / 2);
|
|
}
|
|
|
|
base->MCCR0 = value;
|
|
|
|
for (i = 0; i < 8; i++)
|
|
{
|
|
if (bestPre == (1U << i))
|
|
{
|
|
bestPre = i;
|
|
break;
|
|
}
|
|
}
|
|
base->MCFGR1 = (base->MCFGR1 & ~LPI2C_MCFGR1_PRESCALE_MASK) | LPI2C_MCFGR1_PRESCALE(bestPre);
|
|
|
|
/* Restore master mode. */
|
|
if (wasEnabled)
|
|
{
|
|
LPI2C_MasterEnable(base, true);
|
|
}
|
|
}
|
|
|
|
/*!
|
|
* brief Sends a START signal and slave address on the I2C bus.
|
|
*
|
|
* This function is used to initiate a new master mode transfer. First, the bus state is checked to ensure
|
|
* that another master is not occupying the bus. Then a START signal is transmitted, followed by the
|
|
* 7-bit address specified in the a address parameter. Note that this function does not actually wait
|
|
* until the START and address are successfully sent on the bus before returning.
|
|
*
|
|
* param base The LPI2C peripheral base address.
|
|
* param address 7-bit slave device address, in bits [6:0].
|
|
* param dir Master transfer direction, either #kLPI2C_Read or #kLPI2C_Write. This parameter is used to set
|
|
* the R/w bit (bit 0) in the transmitted slave address.
|
|
* retval #kStatus_Success START signal and address were successfully enqueued in the transmit FIFO.
|
|
* retval #kStatus_LPI2C_Busy Another master is currently utilizing the bus.
|
|
*/
|
|
status_t LPI2C_MasterStart(LPI2C_Type *base, uint8_t address, lpi2c_direction_t dir)
|
|
{
|
|
/* Return an error if the bus is already in use not by us. */
|
|
status_t result = LPI2C_CheckForBusyBus(base);
|
|
if (result)
|
|
{
|
|
return result;
|
|
}
|
|
|
|
/* Clear all flags. */
|
|
LPI2C_MasterClearStatusFlags(base, kMasterClearFlags);
|
|
|
|
/* Turn off auto-stop option. */
|
|
base->MCFGR1 &= ~LPI2C_MCFGR1_AUTOSTOP_MASK;
|
|
|
|
/* Wait until there is room in the fifo. */
|
|
result = LPI2C_MasterWaitForTxReady(base);
|
|
if (result)
|
|
{
|
|
return result;
|
|
}
|
|
|
|
/* Issue start command. */
|
|
base->MTDR = kStartCmd | (((uint32_t)address << 1U) | (uint32_t)dir);
|
|
|
|
return kStatus_Success;
|
|
}
|
|
|
|
/*!
|
|
* brief Sends a STOP signal on the I2C bus.
|
|
*
|
|
* This function does not return until the STOP signal is seen on the bus, or an error occurs.
|
|
*
|
|
* param base The LPI2C peripheral base address.
|
|
* retval #kStatus_Success The STOP signal was successfully sent on the bus and the transaction terminated.
|
|
* retval #kStatus_LPI2C_Busy Another master is currently utilizing the bus.
|
|
* retval #kStatus_LPI2C_Nak The slave device sent a NAK in response to a byte.
|
|
* retval #kStatus_LPI2C_FifoError FIFO under run or overrun.
|
|
* retval #kStatus_LPI2C_ArbitrationLost Arbitration lost error.
|
|
* retval #kStatus_LPI2C_PinLowTimeout SCL or SDA were held low longer than the timeout.
|
|
*/
|
|
status_t LPI2C_MasterStop(LPI2C_Type *base)
|
|
{
|
|
/* Wait until there is room in the fifo. */
|
|
status_t result = LPI2C_MasterWaitForTxReady(base);
|
|
if (result)
|
|
{
|
|
return result;
|
|
}
|
|
|
|
/* Send the STOP signal */
|
|
base->MTDR = kStopCmd;
|
|
|
|
/* Wait for the stop detected flag to set, indicating the transfer has completed on the bus. */
|
|
/* Also check for errors while waiting. */
|
|
#if LPI2C_WAIT_TIMEOUT
|
|
uint32_t waitTimes = LPI2C_WAIT_TIMEOUT;
|
|
#endif
|
|
|
|
#if LPI2C_WAIT_TIMEOUT
|
|
while ((result == kStatus_Success) && (--waitTimes))
|
|
#else
|
|
while (result == kStatus_Success)
|
|
#endif
|
|
{
|
|
uint32_t status = LPI2C_MasterGetStatusFlags(base);
|
|
|
|
/* Check for error flags. */
|
|
result = LPI2C_MasterCheckAndClearError(base, status);
|
|
|
|
/* Check if the stop was sent successfully. */
|
|
if (status & kLPI2C_MasterStopDetectFlag)
|
|
{
|
|
LPI2C_MasterClearStatusFlags(base, kLPI2C_MasterStopDetectFlag);
|
|
break;
|
|
}
|
|
}
|
|
|
|
#if LPI2C_WAIT_TIMEOUT
|
|
if (waitTimes == 0)
|
|
{
|
|
return kStatus_LPI2C_Timeout;
|
|
}
|
|
#endif
|
|
|
|
return result;
|
|
}
|
|
|
|
/*!
|
|
* brief Performs a polling receive transfer on the I2C bus.
|
|
*
|
|
* param base The LPI2C peripheral base address.
|
|
* param rxBuff The pointer to the data to be transferred.
|
|
* param rxSize The length in bytes of the data to be transferred.
|
|
* retval #kStatus_Success Data was received successfully.
|
|
* retval #kStatus_LPI2C_Busy Another master is currently utilizing the bus.
|
|
* retval #kStatus_LPI2C_Nak The slave device sent a NAK in response to a byte.
|
|
* retval #kStatus_LPI2C_FifoError FIFO under run or overrun.
|
|
* retval #kStatus_LPI2C_ArbitrationLost Arbitration lost error.
|
|
* retval #kStatus_LPI2C_PinLowTimeout SCL or SDA were held low longer than the timeout.
|
|
*/
|
|
status_t LPI2C_MasterReceive(LPI2C_Type *base, void *rxBuff, size_t rxSize)
|
|
{
|
|
status_t result;
|
|
uint8_t *buf;
|
|
|
|
assert(rxBuff);
|
|
|
|
/* Handle empty read. */
|
|
if (!rxSize)
|
|
{
|
|
return kStatus_Success;
|
|
}
|
|
|
|
/* Wait until there is room in the command fifo. */
|
|
result = LPI2C_MasterWaitForTxReady(base);
|
|
if (result)
|
|
{
|
|
return result;
|
|
}
|
|
|
|
/* Issue command to receive data. */
|
|
base->MTDR = kRxDataCmd | LPI2C_MTDR_DATA(rxSize - 1);
|
|
|
|
#if LPI2C_WAIT_TIMEOUT
|
|
uint32_t waitTimes = LPI2C_WAIT_TIMEOUT;
|
|
#endif
|
|
|
|
/* Receive data */
|
|
buf = (uint8_t *)rxBuff;
|
|
while (rxSize--)
|
|
{
|
|
/* Read LPI2C receive fifo register. The register includes a flag to indicate whether */
|
|
/* the FIFO is empty, so we can both get the data and check if we need to keep reading */
|
|
/* using a single register read. */
|
|
uint32_t value;
|
|
do
|
|
{
|
|
/* Check for errors. */
|
|
result = LPI2C_MasterCheckAndClearError(base, LPI2C_MasterGetStatusFlags(base));
|
|
if (result)
|
|
{
|
|
return result;
|
|
}
|
|
|
|
value = base->MRDR;
|
|
#if LPI2C_WAIT_TIMEOUT
|
|
} while ((value & LPI2C_MRDR_RXEMPTY_MASK) && (--waitTimes));
|
|
if (waitTimes == 0)
|
|
{
|
|
return kStatus_LPI2C_Timeout;
|
|
}
|
|
#else
|
|
} while (value & LPI2C_MRDR_RXEMPTY_MASK);
|
|
#endif
|
|
|
|
*buf++ = value & LPI2C_MRDR_DATA_MASK;
|
|
}
|
|
|
|
return kStatus_Success;
|
|
}
|
|
|
|
/*!
|
|
* brief Performs a polling send transfer on the I2C bus.
|
|
*
|
|
* Sends up to a txSize number of bytes to the previously addressed slave device. The slave may
|
|
* reply with a NAK to any byte in order to terminate the transfer early. If this happens, this
|
|
* function returns #kStatus_LPI2C_Nak.
|
|
*
|
|
* param base The LPI2C peripheral base address.
|
|
* param txBuff The pointer to the data to be transferred.
|
|
* param txSize The length in bytes of the data to be transferred.
|
|
* retval #kStatus_Success Data was sent successfully.
|
|
* retval #kStatus_LPI2C_Busy Another master is currently utilizing the bus.
|
|
* retval #kStatus_LPI2C_Nak The slave device sent a NAK in response to a byte.
|
|
* retval #kStatus_LPI2C_FifoError FIFO under run or over run.
|
|
* retval #kStatus_LPI2C_ArbitrationLost Arbitration lost error.
|
|
* retval #kStatus_LPI2C_PinLowTimeout SCL or SDA were held low longer than the timeout.
|
|
*/
|
|
status_t LPI2C_MasterSend(LPI2C_Type *base, void *txBuff, size_t txSize)
|
|
{
|
|
uint8_t *buf = (uint8_t *)txBuff;
|
|
|
|
assert(txBuff);
|
|
|
|
/* Send data buffer */
|
|
while (txSize--)
|
|
{
|
|
/* Wait until there is room in the fifo. This also checks for errors. */
|
|
status_t result = LPI2C_MasterWaitForTxReady(base);
|
|
if (result)
|
|
{
|
|
return result;
|
|
}
|
|
|
|
/* Write byte into LPI2C master data register. */
|
|
base->MTDR = *buf++;
|
|
}
|
|
|
|
return kStatus_Success;
|
|
}
|
|
|
|
/*!
|
|
* brief Performs a master polling transfer on the I2C bus.
|
|
*
|
|
* note The API does not return until the transfer succeeds or fails due
|
|
* to error happens during transfer.
|
|
*
|
|
* param base The LPI2C peripheral base address.
|
|
* param transfer Pointer to the transfer structure.
|
|
* retval #kStatus_Success Data was received successfully.
|
|
* retval #kStatus_LPI2C_Busy Another master is currently utilizing the bus.
|
|
* retval #kStatus_LPI2C_Nak The slave device sent a NAK in response to a byte.
|
|
* retval #kStatus_LPI2C_FifoError FIFO under run or overrun.
|
|
* retval #kStatus_LPI2C_ArbitrationLost Arbitration lost error.
|
|
* retval #kStatus_LPI2C_PinLowTimeout SCL or SDA were held low longer than the timeout.
|
|
*/
|
|
status_t LPI2C_MasterTransferBlocking(LPI2C_Type *base, lpi2c_master_transfer_t *transfer)
|
|
{
|
|
status_t result = kStatus_Success;
|
|
uint16_t commandBuffer[7];
|
|
uint32_t cmdCount = 0;
|
|
|
|
assert(transfer);
|
|
assert(transfer->subaddressSize <= sizeof(transfer->subaddress));
|
|
|
|
/* Return an error if the bus is already in use not by us. */
|
|
result = LPI2C_CheckForBusyBus(base);
|
|
if (result)
|
|
{
|
|
return result;
|
|
}
|
|
|
|
/* Clear all flags. */
|
|
LPI2C_MasterClearStatusFlags(base, kMasterClearFlags);
|
|
|
|
/* Turn off auto-stop option. */
|
|
base->MCFGR1 &= ~LPI2C_MCFGR1_AUTOSTOP_MASK;
|
|
|
|
lpi2c_direction_t direction = transfer->subaddressSize ? kLPI2C_Write : transfer->direction;
|
|
if (!(transfer->flags & kLPI2C_TransferNoStartFlag))
|
|
{
|
|
commandBuffer[cmdCount++] =
|
|
(uint16_t)kStartCmd | (uint16_t)((uint16_t)((uint16_t)transfer->slaveAddress << 1U) | (uint16_t)direction);
|
|
}
|
|
|
|
/* Subaddress, MSB first. */
|
|
if (transfer->subaddressSize)
|
|
{
|
|
uint32_t subaddressRemaining = transfer->subaddressSize;
|
|
while (subaddressRemaining--)
|
|
{
|
|
uint8_t subaddressByte = (transfer->subaddress >> (8 * subaddressRemaining)) & 0xff;
|
|
commandBuffer[cmdCount++] = subaddressByte;
|
|
}
|
|
}
|
|
|
|
/* Reads need special handling. */
|
|
if ((transfer->dataSize) && (transfer->direction == kLPI2C_Read))
|
|
{
|
|
/* Need to send repeated start if switching directions to read. */
|
|
if (direction == kLPI2C_Write)
|
|
{
|
|
commandBuffer[cmdCount++] =
|
|
(uint16_t)kStartCmd |
|
|
(uint16_t)((uint16_t)((uint16_t)transfer->slaveAddress << 1U) | (uint16_t)kLPI2C_Read);
|
|
}
|
|
}
|
|
|
|
/* Send command buffer */
|
|
uint32_t index = 0;
|
|
while (cmdCount--)
|
|
{
|
|
/* Wait until there is room in the fifo. This also checks for errors. */
|
|
result = LPI2C_MasterWaitForTxReady(base);
|
|
if (result)
|
|
{
|
|
return result;
|
|
}
|
|
|
|
/* Write byte into LPI2C master data register. */
|
|
base->MTDR = commandBuffer[index];
|
|
index++;
|
|
}
|
|
|
|
/* Transmit data. */
|
|
if ((transfer->direction == kLPI2C_Write) && (transfer->dataSize > 0))
|
|
{
|
|
/* Send Data. */
|
|
result = LPI2C_MasterSend(base, transfer->data, transfer->dataSize);
|
|
}
|
|
|
|
/* Receive Data. */
|
|
if ((transfer->direction == kLPI2C_Read) && (transfer->dataSize > 0))
|
|
{
|
|
result = LPI2C_MasterReceive(base, transfer->data, transfer->dataSize);
|
|
}
|
|
|
|
if (result)
|
|
{
|
|
return result;
|
|
}
|
|
|
|
if ((transfer->flags & kLPI2C_TransferNoStopFlag) == 0)
|
|
{
|
|
result = LPI2C_MasterStop(base);
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
/*!
|
|
* brief Creates a new handle for the LPI2C master non-blocking APIs.
|
|
*
|
|
* The creation of a handle is for use with the non-blocking APIs. Once a handle
|
|
* is created, there is not a corresponding destroy handle. If the user wants to
|
|
* terminate a transfer, the LPI2C_MasterTransferAbort() API shall be called.
|
|
*
|
|
*
|
|
* note The function also enables the NVIC IRQ for the input LPI2C. Need to notice
|
|
* that on some SoCs the LPI2C IRQ is connected to INTMUX, in this case user needs to
|
|
* enable the associated INTMUX IRQ in application.
|
|
*
|
|
* param base The LPI2C peripheral base address.
|
|
* param[out] handle Pointer to the LPI2C master driver handle.
|
|
* param callback User provided pointer to the asynchronous callback function.
|
|
* param userData User provided pointer to the application callback data.
|
|
*/
|
|
void LPI2C_MasterTransferCreateHandle(LPI2C_Type *base,
|
|
lpi2c_master_handle_t *handle,
|
|
lpi2c_master_transfer_callback_t callback,
|
|
void *userData)
|
|
{
|
|
uint32_t instance;
|
|
|
|
assert(handle);
|
|
|
|
/* Clear out the handle. */
|
|
memset(handle, 0, sizeof(*handle));
|
|
|
|
/* Look up instance number */
|
|
instance = LPI2C_GetInstance(base);
|
|
|
|
/* Save base and instance. */
|
|
handle->completionCallback = callback;
|
|
handle->userData = userData;
|
|
|
|
/* Save this handle for IRQ use. */
|
|
s_lpi2cMasterHandle[instance] = handle;
|
|
|
|
/* Set irq handler. */
|
|
s_lpi2cMasterIsr = LPI2C_MasterTransferHandleIRQ;
|
|
|
|
/* Clear internal IRQ enables and enable NVIC IRQ. */
|
|
LPI2C_MasterDisableInterrupts(base, kMasterIrqFlags);
|
|
|
|
/* Enable NVIC IRQ, this only enables the IRQ directly connected to the NVIC.
|
|
In some cases the LPI2C IRQ is configured through INTMUX, user needs to enable
|
|
INTMUX IRQ in application code. */
|
|
EnableIRQ(kLpi2cIrqs[instance]);
|
|
}
|
|
|
|
/*!
|
|
* @brief Execute states until FIFOs are exhausted.
|
|
* @param handle Master nonblocking driver handle.
|
|
* @param[out] isDone Set to true if the transfer has completed.
|
|
* @retval #kStatus_Success
|
|
* @retval #kStatus_LPI2C_PinLowTimeout
|
|
* @retval #kStatus_LPI2C_ArbitrationLost
|
|
* @retval #kStatus_LPI2C_Nak
|
|
* @retval #kStatus_LPI2C_FifoError
|
|
*/
|
|
static status_t LPI2C_RunTransferStateMachine(LPI2C_Type *base, lpi2c_master_handle_t *handle, bool *isDone)
|
|
{
|
|
uint32_t status;
|
|
status_t result = kStatus_Success;
|
|
lpi2c_master_transfer_t *xfer;
|
|
size_t txCount;
|
|
size_t rxCount;
|
|
size_t txFifoSize = FSL_FEATURE_LPI2C_FIFO_SIZEn(base);
|
|
bool state_complete = false;
|
|
|
|
/* Set default isDone return value. */
|
|
*isDone = false;
|
|
|
|
/* Check for errors. */
|
|
status = LPI2C_MasterGetStatusFlags(base);
|
|
result = LPI2C_MasterCheckAndClearError(base, status);
|
|
if (result)
|
|
{
|
|
return result;
|
|
}
|
|
|
|
/* Get pointer to private data. */
|
|
xfer = &handle->transfer;
|
|
|
|
/* Get fifo counts and compute room in tx fifo. */
|
|
LPI2C_MasterGetFifoCounts(base, &rxCount, &txCount);
|
|
txCount = txFifoSize - txCount;
|
|
|
|
while (!state_complete)
|
|
{
|
|
/* Execute the state. */
|
|
switch (handle->state)
|
|
{
|
|
case kSendCommandState:
|
|
{
|
|
/* Make sure there is room in the tx fifo for the next command. */
|
|
if (!txCount--)
|
|
{
|
|
state_complete = true;
|
|
break;
|
|
}
|
|
|
|
/* Issue command. buf is a uint8_t* pointing at the uint16 command array. */
|
|
base->MTDR = *(uint16_t *)handle->buf;
|
|
handle->buf += sizeof(uint16_t);
|
|
|
|
/* Count down until all commands are sent. */
|
|
if (--handle->remainingBytes == 0)
|
|
{
|
|
/* Choose next state and set up buffer pointer and count. */
|
|
if (xfer->dataSize)
|
|
{
|
|
/* Either a send or receive transfer is next. */
|
|
handle->state = kTransferDataState;
|
|
handle->buf = (uint8_t *)xfer->data;
|
|
handle->remainingBytes = xfer->dataSize;
|
|
if (xfer->direction == kLPI2C_Read)
|
|
{
|
|
/* Disable TX interrupt */
|
|
LPI2C_MasterDisableInterrupts(base, kLPI2C_MasterTxReadyFlag);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* No transfer, so move to stop state. */
|
|
handle->state = kStopState;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
|
|
case kIssueReadCommandState:
|
|
/* Make sure there is room in the tx fifo for the read command. */
|
|
if (!txCount--)
|
|
{
|
|
state_complete = true;
|
|
break;
|
|
}
|
|
|
|
base->MTDR = kRxDataCmd | LPI2C_MTDR_DATA(xfer->dataSize - 1);
|
|
|
|
/* Move to transfer state. */
|
|
handle->state = kTransferDataState;
|
|
if (xfer->direction == kLPI2C_Read)
|
|
{
|
|
/* Disable TX interrupt */
|
|
LPI2C_MasterDisableInterrupts(base, kLPI2C_MasterTxReadyFlag);
|
|
}
|
|
break;
|
|
|
|
case kTransferDataState:
|
|
if (xfer->direction == kLPI2C_Write)
|
|
{
|
|
/* Make sure there is room in the tx fifo. */
|
|
if (!txCount--)
|
|
{
|
|
state_complete = true;
|
|
break;
|
|
}
|
|
|
|
/* Put byte to send in fifo. */
|
|
base->MTDR = *(handle->buf)++;
|
|
}
|
|
else
|
|
{
|
|
/* XXX handle receive sizes > 256, use kIssueReadCommandState */
|
|
/* Make sure there is data in the rx fifo. */
|
|
if (!rxCount--)
|
|
{
|
|
state_complete = true;
|
|
break;
|
|
}
|
|
|
|
/* Read byte from fifo. */
|
|
*(handle->buf)++ = base->MRDR & LPI2C_MRDR_DATA_MASK;
|
|
}
|
|
|
|
/* Move to stop when the transfer is done. */
|
|
if (--handle->remainingBytes == 0)
|
|
{
|
|
handle->state = kStopState;
|
|
}
|
|
break;
|
|
|
|
case kStopState:
|
|
/* Only issue a stop transition if the caller requested it. */
|
|
if ((xfer->flags & kLPI2C_TransferNoStopFlag) == 0)
|
|
{
|
|
/* Make sure there is room in the tx fifo for the stop command. */
|
|
if (!txCount--)
|
|
{
|
|
state_complete = true;
|
|
break;
|
|
}
|
|
|
|
base->MTDR = kStopCmd;
|
|
}
|
|
else
|
|
{
|
|
/* Caller doesn't want to send a stop, so we're done now. */
|
|
*isDone = true;
|
|
state_complete = true;
|
|
break;
|
|
}
|
|
handle->state = kWaitForCompletionState;
|
|
break;
|
|
|
|
case kWaitForCompletionState:
|
|
/* We stay in this state until the stop state is detected. */
|
|
if (status & kLPI2C_MasterStopDetectFlag)
|
|
{
|
|
*isDone = true;
|
|
}
|
|
state_complete = true;
|
|
break;
|
|
default:
|
|
assert(false);
|
|
break;
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/*!
|
|
* @brief Prepares the transfer state machine and fills in the command buffer.
|
|
* @param handle Master nonblocking driver handle.
|
|
*/
|
|
static void LPI2C_InitTransferStateMachine(lpi2c_master_handle_t *handle)
|
|
{
|
|
lpi2c_master_transfer_t *xfer = &handle->transfer;
|
|
|
|
/* Handle no start option. */
|
|
if (xfer->flags & kLPI2C_TransferNoStartFlag)
|
|
{
|
|
if (xfer->direction == kLPI2C_Read)
|
|
{
|
|
/* Need to issue read command first. */
|
|
handle->state = kIssueReadCommandState;
|
|
}
|
|
else
|
|
{
|
|
/* Start immediately in the data transfer state. */
|
|
handle->state = kTransferDataState;
|
|
}
|
|
|
|
handle->buf = (uint8_t *)xfer->data;
|
|
handle->remainingBytes = xfer->dataSize;
|
|
}
|
|
else
|
|
{
|
|
uint16_t *cmd = (uint16_t *)&handle->commandBuffer;
|
|
uint32_t cmdCount = 0;
|
|
|
|
/* Initial direction depends on whether a subaddress was provided, and of course the actual */
|
|
/* data transfer direction. */
|
|
lpi2c_direction_t direction = xfer->subaddressSize ? kLPI2C_Write : xfer->direction;
|
|
|
|
/* Start command. */
|
|
cmd[cmdCount++] =
|
|
(uint16_t)kStartCmd | (uint16_t)((uint16_t)((uint16_t)xfer->slaveAddress << 1U) | (uint16_t)direction);
|
|
|
|
/* Subaddress, MSB first. */
|
|
if (xfer->subaddressSize)
|
|
{
|
|
uint32_t subaddressRemaining = xfer->subaddressSize;
|
|
while (subaddressRemaining--)
|
|
{
|
|
uint8_t subaddressByte = (xfer->subaddress >> (8 * subaddressRemaining)) & 0xff;
|
|
cmd[cmdCount++] = subaddressByte;
|
|
}
|
|
}
|
|
|
|
/* Reads need special handling. */
|
|
if ((xfer->dataSize) && (xfer->direction == kLPI2C_Read))
|
|
{
|
|
/* Need to send repeated start if switching directions to read. */
|
|
if (direction == kLPI2C_Write)
|
|
{
|
|
cmd[cmdCount++] = (uint16_t)kStartCmd |
|
|
(uint16_t)((uint16_t)((uint16_t)xfer->slaveAddress << 1U) | (uint16_t)kLPI2C_Read);
|
|
}
|
|
|
|
/* Read command. */
|
|
cmd[cmdCount++] = kRxDataCmd | LPI2C_MTDR_DATA(xfer->dataSize - 1);
|
|
}
|
|
|
|
/* Set up state machine for transferring the commands. */
|
|
handle->state = kSendCommandState;
|
|
handle->remainingBytes = cmdCount;
|
|
handle->buf = (uint8_t *)&handle->commandBuffer;
|
|
}
|
|
}
|
|
|
|
/*!
|
|
* brief Performs a non-blocking transaction on the I2C bus.
|
|
*
|
|
* param base The LPI2C peripheral base address.
|
|
* param handle Pointer to the LPI2C master driver handle.
|
|
* param transfer The pointer to the transfer descriptor.
|
|
* retval #kStatus_Success The transaction was started successfully.
|
|
* retval #kStatus_LPI2C_Busy Either another master is currently utilizing the bus, or a non-blocking
|
|
* transaction is already in progress.
|
|
*/
|
|
status_t LPI2C_MasterTransferNonBlocking(LPI2C_Type *base,
|
|
lpi2c_master_handle_t *handle,
|
|
lpi2c_master_transfer_t *transfer)
|
|
{
|
|
status_t result;
|
|
|
|
assert(handle);
|
|
assert(transfer);
|
|
assert(transfer->subaddressSize <= sizeof(transfer->subaddress));
|
|
|
|
/* Return busy if another transaction is in progress. */
|
|
if (handle->state != kIdleState)
|
|
{
|
|
return kStatus_LPI2C_Busy;
|
|
}
|
|
|
|
/* Return an error if the bus is already in use not by us. */
|
|
result = LPI2C_CheckForBusyBus(base);
|
|
if (result)
|
|
{
|
|
return result;
|
|
}
|
|
|
|
/* Disable LPI2C IRQ sources while we configure stuff. */
|
|
LPI2C_MasterDisableInterrupts(base, kMasterIrqFlags);
|
|
|
|
/* Save transfer into handle. */
|
|
handle->transfer = *transfer;
|
|
|
|
/* Generate commands to send. */
|
|
LPI2C_InitTransferStateMachine(handle);
|
|
|
|
/* Clear all flags. */
|
|
LPI2C_MasterClearStatusFlags(base, kMasterClearFlags);
|
|
|
|
/* Turn off auto-stop option. */
|
|
base->MCFGR1 &= ~LPI2C_MCFGR1_AUTOSTOP_MASK;
|
|
|
|
/* Enable LPI2C internal IRQ sources. NVIC IRQ was enabled in CreateHandle() */
|
|
LPI2C_MasterEnableInterrupts(base, kMasterIrqFlags);
|
|
|
|
return result;
|
|
}
|
|
|
|
/*!
|
|
* brief Returns number of bytes transferred so far.
|
|
* param base The LPI2C peripheral base address.
|
|
* param handle Pointer to the LPI2C master driver handle.
|
|
* param[out] count Number of bytes transferred so far by the non-blocking transaction.
|
|
* retval #kStatus_Success
|
|
* retval #kStatus_NoTransferInProgress There is not a non-blocking transaction currently in progress.
|
|
*/
|
|
status_t LPI2C_MasterTransferGetCount(LPI2C_Type *base, lpi2c_master_handle_t *handle, size_t *count)
|
|
{
|
|
assert(handle);
|
|
|
|
if (!count)
|
|
{
|
|
return kStatus_InvalidArgument;
|
|
}
|
|
|
|
/* Catch when there is not an active transfer. */
|
|
if (handle->state == kIdleState)
|
|
{
|
|
*count = 0;
|
|
return kStatus_NoTransferInProgress;
|
|
}
|
|
|
|
uint8_t state;
|
|
uint16_t remainingBytes;
|
|
uint32_t dataSize;
|
|
|
|
/* Cache some fields with IRQs disabled. This ensures all field values */
|
|
/* are synchronized with each other during an ongoing transfer. */
|
|
uint32_t irqs = LPI2C_MasterGetEnabledInterrupts(base);
|
|
LPI2C_MasterDisableInterrupts(base, irqs);
|
|
state = handle->state;
|
|
remainingBytes = handle->remainingBytes;
|
|
dataSize = handle->transfer.dataSize;
|
|
LPI2C_MasterEnableInterrupts(base, irqs);
|
|
|
|
/* Get transfer count based on current transfer state. */
|
|
switch (state)
|
|
{
|
|
case kIdleState:
|
|
case kSendCommandState:
|
|
case kIssueReadCommandState: /* XXX return correct value for this state when >256 reads are supported */
|
|
*count = 0;
|
|
break;
|
|
|
|
case kTransferDataState:
|
|
*count = dataSize - remainingBytes;
|
|
break;
|
|
|
|
case kStopState:
|
|
case kWaitForCompletionState:
|
|
default:
|
|
*count = dataSize;
|
|
break;
|
|
}
|
|
|
|
return kStatus_Success;
|
|
}
|
|
|
|
/*!
|
|
* brief Terminates a non-blocking LPI2C master transmission early.
|
|
*
|
|
* note It is not safe to call this function from an IRQ handler that has a higher priority than the
|
|
* LPI2C peripheral's IRQ priority.
|
|
*
|
|
* param base The LPI2C peripheral base address.
|
|
* param handle Pointer to the LPI2C master driver handle.
|
|
* retval #kStatus_Success A transaction was successfully aborted.
|
|
* retval #kStatus_LPI2C_Idle There is not a non-blocking transaction currently in progress.
|
|
*/
|
|
void LPI2C_MasterTransferAbort(LPI2C_Type *base, lpi2c_master_handle_t *handle)
|
|
{
|
|
if (handle->state != kIdleState)
|
|
{
|
|
/* Disable internal IRQ enables. */
|
|
LPI2C_MasterDisableInterrupts(base, kMasterIrqFlags);
|
|
|
|
/* Reset fifos. */
|
|
base->MCR |= LPI2C_MCR_RRF_MASK | LPI2C_MCR_RTF_MASK;
|
|
|
|
/* Send a stop command to finalize the transfer. */
|
|
base->MTDR = kStopCmd;
|
|
|
|
/* Reset handle. */
|
|
handle->state = kIdleState;
|
|
}
|
|
}
|
|
|
|
/*!
|
|
* brief Reusable routine to handle master interrupts.
|
|
* note This function does not need to be called unless you are reimplementing the
|
|
* nonblocking API's interrupt handler routines to add special functionality.
|
|
* param base The LPI2C peripheral base address.
|
|
* param handle Pointer to the LPI2C master driver handle.
|
|
*/
|
|
void LPI2C_MasterTransferHandleIRQ(LPI2C_Type *base, lpi2c_master_handle_t *handle)
|
|
{
|
|
bool isDone;
|
|
status_t result;
|
|
|
|
/* Don't do anything if we don't have a valid handle. */
|
|
if (!handle)
|
|
{
|
|
return;
|
|
}
|
|
|
|
if (handle->state == kIdleState)
|
|
{
|
|
return;
|
|
}
|
|
|
|
result = LPI2C_RunTransferStateMachine(base, handle, &isDone);
|
|
|
|
if (isDone || (result != kStatus_Success))
|
|
{
|
|
/* XXX need to handle data that may be in rx fifo below watermark level? */
|
|
|
|
/* XXX handle error, terminate xfer */
|
|
|
|
/* Disable internal IRQ enables. */
|
|
LPI2C_MasterDisableInterrupts(base, kMasterIrqFlags);
|
|
|
|
/* Set handle to idle state. */
|
|
handle->state = kIdleState;
|
|
|
|
/* Invoke callback. */
|
|
if (handle->completionCallback)
|
|
{
|
|
handle->completionCallback(base, handle, result, handle->userData);
|
|
}
|
|
}
|
|
}
|
|
|
|
/*!
|
|
* brief Provides a default configuration for the LPI2C slave peripheral.
|
|
*
|
|
* This function provides the following default configuration for the LPI2C slave peripheral:
|
|
* code
|
|
* slaveConfig->enableSlave = true;
|
|
* slaveConfig->address0 = 0U;
|
|
* slaveConfig->address1 = 0U;
|
|
* slaveConfig->addressMatchMode = kLPI2C_MatchAddress0;
|
|
* slaveConfig->filterDozeEnable = true;
|
|
* slaveConfig->filterEnable = true;
|
|
* slaveConfig->enableGeneralCall = false;
|
|
* slaveConfig->sclStall.enableAck = false;
|
|
* slaveConfig->sclStall.enableTx = true;
|
|
* slaveConfig->sclStall.enableRx = true;
|
|
* slaveConfig->sclStall.enableAddress = true;
|
|
* slaveConfig->ignoreAck = false;
|
|
* slaveConfig->enableReceivedAddressRead = false;
|
|
* slaveConfig->sdaGlitchFilterWidth_ns = 0;
|
|
* slaveConfig->sclGlitchFilterWidth_ns = 0;
|
|
* slaveConfig->dataValidDelay_ns = 0;
|
|
* slaveConfig->clockHoldTime_ns = 0;
|
|
* endcode
|
|
*
|
|
* After calling this function, override any settings to customize the configuration,
|
|
* prior to initializing the master driver with LPI2C_SlaveInit(). Be sure to override at least the a
|
|
* address0 member of the configuration structure with the desired slave address.
|
|
*
|
|
* param[out] slaveConfig User provided configuration structure that is set to default values. Refer to
|
|
* #lpi2c_slave_config_t.
|
|
*/
|
|
void LPI2C_SlaveGetDefaultConfig(lpi2c_slave_config_t *slaveConfig)
|
|
{
|
|
/* Initializes the configure structure to zero. */
|
|
memset(slaveConfig, 0, sizeof(*slaveConfig));
|
|
|
|
slaveConfig->enableSlave = true;
|
|
slaveConfig->address0 = 0U;
|
|
slaveConfig->address1 = 0U;
|
|
slaveConfig->addressMatchMode = kLPI2C_MatchAddress0;
|
|
slaveConfig->filterDozeEnable = true;
|
|
slaveConfig->filterEnable = true;
|
|
slaveConfig->enableGeneralCall = false;
|
|
slaveConfig->sclStall.enableAck = false;
|
|
slaveConfig->sclStall.enableTx = true;
|
|
slaveConfig->sclStall.enableRx = true;
|
|
slaveConfig->sclStall.enableAddress = false;
|
|
slaveConfig->ignoreAck = false;
|
|
slaveConfig->enableReceivedAddressRead = false;
|
|
slaveConfig->sdaGlitchFilterWidth_ns = 0; /* TODO determine default width values */
|
|
slaveConfig->sclGlitchFilterWidth_ns = 0;
|
|
slaveConfig->dataValidDelay_ns = 0;
|
|
slaveConfig->clockHoldTime_ns = 0;
|
|
}
|
|
|
|
/*!
|
|
* brief Initializes the LPI2C slave peripheral.
|
|
*
|
|
* This function enables the peripheral clock and initializes the LPI2C slave peripheral as described by the user
|
|
* provided configuration.
|
|
*
|
|
* param base The LPI2C peripheral base address.
|
|
* param slaveConfig User provided peripheral configuration. Use LPI2C_SlaveGetDefaultConfig() to get a set of defaults
|
|
* that you can override.
|
|
* param sourceClock_Hz Frequency in Hertz of the LPI2C functional clock. Used to calculate the filter widths,
|
|
* data valid delay, and clock hold time.
|
|
*/
|
|
void LPI2C_SlaveInit(LPI2C_Type *base, const lpi2c_slave_config_t *slaveConfig, uint32_t sourceClock_Hz)
|
|
{
|
|
#if !(defined(FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL) && FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL)
|
|
|
|
uint32_t instance = LPI2C_GetInstance(base);
|
|
|
|
/* Ungate the clock. */
|
|
CLOCK_EnableClock(kLpi2cClocks[instance]);
|
|
#if defined(LPI2C_PERIPH_CLOCKS)
|
|
/* Ungate the functional clock in initialize function. */
|
|
CLOCK_EnableClock(kLpi2cPeriphClocks[instance]);
|
|
#endif
|
|
|
|
#endif /* FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL */
|
|
|
|
/* Restore to reset conditions. */
|
|
LPI2C_SlaveReset(base);
|
|
|
|
/* Configure peripheral. */
|
|
base->SAMR = LPI2C_SAMR_ADDR0(slaveConfig->address0) | LPI2C_SAMR_ADDR1(slaveConfig->address1);
|
|
|
|
base->SCFGR1 =
|
|
LPI2C_SCFGR1_ADDRCFG(slaveConfig->addressMatchMode) | LPI2C_SCFGR1_IGNACK(slaveConfig->ignoreAck) |
|
|
LPI2C_SCFGR1_RXCFG(slaveConfig->enableReceivedAddressRead) | LPI2C_SCFGR1_GCEN(slaveConfig->enableGeneralCall) |
|
|
LPI2C_SCFGR1_ACKSTALL(slaveConfig->sclStall.enableAck) | LPI2C_SCFGR1_TXDSTALL(slaveConfig->sclStall.enableTx) |
|
|
LPI2C_SCFGR1_RXSTALL(slaveConfig->sclStall.enableRx) |
|
|
LPI2C_SCFGR1_ADRSTALL(slaveConfig->sclStall.enableAddress);
|
|
|
|
base->SCFGR2 =
|
|
LPI2C_SCFGR2_FILTSDA(LPI2C_GetCyclesForWidth(sourceClock_Hz, slaveConfig->sdaGlitchFilterWidth_ns,
|
|
(LPI2C_SCFGR2_FILTSDA_MASK >> LPI2C_SCFGR2_FILTSDA_SHIFT), 1)) |
|
|
LPI2C_SCFGR2_FILTSCL(LPI2C_GetCyclesForWidth(sourceClock_Hz, slaveConfig->sclGlitchFilterWidth_ns,
|
|
(LPI2C_SCFGR2_FILTSCL_MASK >> LPI2C_SCFGR2_FILTSCL_SHIFT), 1)) |
|
|
LPI2C_SCFGR2_DATAVD(LPI2C_GetCyclesForWidth(sourceClock_Hz, slaveConfig->dataValidDelay_ns,
|
|
(LPI2C_SCFGR2_DATAVD_MASK >> LPI2C_SCFGR2_DATAVD_SHIFT), 1)) |
|
|
LPI2C_SCFGR2_CLKHOLD(LPI2C_GetCyclesForWidth(sourceClock_Hz, slaveConfig->clockHoldTime_ns,
|
|
(LPI2C_SCFGR2_CLKHOLD_MASK >> LPI2C_SCFGR2_CLKHOLD_SHIFT), 1));
|
|
|
|
/* Save SCR to last so we don't enable slave until it is configured */
|
|
base->SCR = LPI2C_SCR_FILTDZ(slaveConfig->filterDozeEnable) | LPI2C_SCR_FILTEN(slaveConfig->filterEnable) |
|
|
LPI2C_SCR_SEN(slaveConfig->enableSlave);
|
|
}
|
|
|
|
/*!
|
|
* brief Deinitializes the LPI2C slave peripheral.
|
|
*
|
|
* This function disables the LPI2C slave peripheral and gates the clock. It also performs a software
|
|
* reset to restore the peripheral to reset conditions.
|
|
*
|
|
* param base The LPI2C peripheral base address.
|
|
*/
|
|
void LPI2C_SlaveDeinit(LPI2C_Type *base)
|
|
{
|
|
LPI2C_SlaveReset(base);
|
|
|
|
#if !(defined(FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL) && FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL)
|
|
|
|
uint32_t instance = LPI2C_GetInstance(base);
|
|
|
|
/* Gate the clock. */
|
|
CLOCK_DisableClock(kLpi2cClocks[instance]);
|
|
|
|
#if defined(LPI2C_PERIPH_CLOCKS)
|
|
/* Gate the functional clock. */
|
|
CLOCK_DisableClock(kLpi2cPeriphClocks[instance]);
|
|
#endif
|
|
|
|
#endif /* FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL */
|
|
}
|
|
|
|
/*!
|
|
* @brief Convert provided flags to status code, and clear any errors if present.
|
|
* @param base The LPI2C peripheral base address.
|
|
* @param status Current status flags value that will be checked.
|
|
* @retval #kStatus_Success
|
|
* @retval #kStatus_LPI2C_BitError
|
|
* @retval #kStatus_LPI2C_FifoError
|
|
*/
|
|
static status_t LPI2C_SlaveCheckAndClearError(LPI2C_Type *base, uint32_t flags)
|
|
{
|
|
status_t result = kStatus_Success;
|
|
|
|
flags &= kSlaveErrorFlags;
|
|
if (flags)
|
|
{
|
|
if (flags & kLPI2C_SlaveBitErrFlag)
|
|
{
|
|
result = kStatus_LPI2C_BitError;
|
|
}
|
|
else if (flags & kLPI2C_SlaveFifoErrFlag)
|
|
{
|
|
result = kStatus_LPI2C_FifoError;
|
|
}
|
|
else
|
|
{
|
|
assert(false);
|
|
}
|
|
|
|
/* Clear the errors. */
|
|
LPI2C_SlaveClearStatusFlags(base, flags);
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
/*!
|
|
* brief Performs a polling send transfer on the I2C bus.
|
|
*
|
|
* param base The LPI2C peripheral base address.
|
|
* param txBuff The pointer to the data to be transferred.
|
|
* param txSize The length in bytes of the data to be transferred.
|
|
* param[out] actualTxSize
|
|
* return Error or success status returned by API.
|
|
*/
|
|
status_t LPI2C_SlaveSend(LPI2C_Type *base, void *txBuff, size_t txSize, size_t *actualTxSize)
|
|
{
|
|
uint8_t *buf = (uint8_t *)txBuff;
|
|
size_t remaining = txSize;
|
|
|
|
assert(txBuff);
|
|
|
|
#if LPI2C_WAIT_TIMEOUT
|
|
uint32_t waitTimes = LPI2C_WAIT_TIMEOUT;
|
|
#endif
|
|
|
|
while (remaining)
|
|
{
|
|
uint32_t flags;
|
|
status_t result;
|
|
|
|
/* Wait until we can transmit. */
|
|
do
|
|
{
|
|
/* Check for errors */
|
|
flags = LPI2C_SlaveGetStatusFlags(base);
|
|
result = LPI2C_SlaveCheckAndClearError(base, flags);
|
|
if (result)
|
|
{
|
|
if (actualTxSize)
|
|
{
|
|
*actualTxSize = txSize - remaining;
|
|
}
|
|
return result;
|
|
}
|
|
#if LPI2C_WAIT_TIMEOUT
|
|
} while (
|
|
(!(flags & (kLPI2C_SlaveTxReadyFlag | kLPI2C_SlaveStopDetectFlag | kLPI2C_SlaveRepeatedStartDetectFlag))) &&
|
|
(--waitTimes));
|
|
if (waitTimes == 0)
|
|
{
|
|
return kStatus_LPI2C_Timeout;
|
|
}
|
|
#else
|
|
} while (
|
|
!(flags & (kLPI2C_SlaveTxReadyFlag | kLPI2C_SlaveStopDetectFlag | kLPI2C_SlaveRepeatedStartDetectFlag)));
|
|
#endif
|
|
|
|
/* Send a byte. */
|
|
if (flags & kLPI2C_SlaveTxReadyFlag)
|
|
{
|
|
base->STDR = *buf++;
|
|
--remaining;
|
|
}
|
|
|
|
/* Exit loop if we see a stop or restart */
|
|
if (flags & (kLPI2C_SlaveStopDetectFlag | kLPI2C_SlaveRepeatedStartDetectFlag))
|
|
{
|
|
LPI2C_SlaveClearStatusFlags(base, kLPI2C_SlaveStopDetectFlag | kLPI2C_SlaveRepeatedStartDetectFlag);
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (actualTxSize)
|
|
{
|
|
*actualTxSize = txSize - remaining;
|
|
}
|
|
|
|
return kStatus_Success;
|
|
}
|
|
|
|
/*!
|
|
* brief Performs a polling receive transfer on the I2C bus.
|
|
*
|
|
* param base The LPI2C peripheral base address.
|
|
* param rxBuff The pointer to the data to be transferred.
|
|
* param rxSize The length in bytes of the data to be transferred.
|
|
* param[out] actualRxSize
|
|
* return Error or success status returned by API.
|
|
*/
|
|
status_t LPI2C_SlaveReceive(LPI2C_Type *base, void *rxBuff, size_t rxSize, size_t *actualRxSize)
|
|
{
|
|
uint8_t *buf = (uint8_t *)rxBuff;
|
|
size_t remaining = rxSize;
|
|
|
|
assert(rxBuff);
|
|
|
|
#if LPI2C_WAIT_TIMEOUT
|
|
uint32_t waitTimes = LPI2C_WAIT_TIMEOUT;
|
|
#endif
|
|
|
|
while (remaining)
|
|
{
|
|
uint32_t flags;
|
|
status_t result;
|
|
|
|
/* Wait until we can receive. */
|
|
do
|
|
{
|
|
/* Check for errors */
|
|
flags = LPI2C_SlaveGetStatusFlags(base);
|
|
result = LPI2C_SlaveCheckAndClearError(base, flags);
|
|
if (result)
|
|
{
|
|
if (actualRxSize)
|
|
{
|
|
*actualRxSize = rxSize - remaining;
|
|
}
|
|
return result;
|
|
}
|
|
#if LPI2C_WAIT_TIMEOUT
|
|
} while (
|
|
(!(flags & (kLPI2C_SlaveRxReadyFlag | kLPI2C_SlaveStopDetectFlag | kLPI2C_SlaveRepeatedStartDetectFlag))) &&
|
|
(--waitTimes));
|
|
if (waitTimes == 0)
|
|
{
|
|
return kStatus_LPI2C_Timeout;
|
|
}
|
|
#else
|
|
} while (
|
|
!(flags & (kLPI2C_SlaveRxReadyFlag | kLPI2C_SlaveStopDetectFlag | kLPI2C_SlaveRepeatedStartDetectFlag)));
|
|
#endif
|
|
|
|
/* Receive a byte. */
|
|
if (flags & kLPI2C_SlaveRxReadyFlag)
|
|
{
|
|
*buf++ = base->SRDR & LPI2C_SRDR_DATA_MASK;
|
|
--remaining;
|
|
}
|
|
|
|
/* Exit loop if we see a stop or restart */
|
|
if (flags & (kLPI2C_SlaveStopDetectFlag | kLPI2C_SlaveRepeatedStartDetectFlag))
|
|
{
|
|
LPI2C_SlaveClearStatusFlags(base, kLPI2C_SlaveStopDetectFlag | kLPI2C_SlaveRepeatedStartDetectFlag);
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (actualRxSize)
|
|
{
|
|
*actualRxSize = rxSize - remaining;
|
|
}
|
|
|
|
return kStatus_Success;
|
|
}
|
|
|
|
/*!
|
|
* brief Creates a new handle for the LPI2C slave non-blocking APIs.
|
|
*
|
|
* The creation of a handle is for use with the non-blocking APIs. Once a handle
|
|
* is created, there is not a corresponding destroy handle. If the user wants to
|
|
* terminate a transfer, the LPI2C_SlaveTransferAbort() API shall be called.
|
|
*
|
|
* note The function also enables the NVIC IRQ for the input LPI2C. Need to notice
|
|
* that on some SoCs the LPI2C IRQ is connected to INTMUX, in this case user needs to
|
|
* enable the associated INTMUX IRQ in application.
|
|
|
|
* param base The LPI2C peripheral base address.
|
|
* param[out] handle Pointer to the LPI2C slave driver handle.
|
|
* param callback User provided pointer to the asynchronous callback function.
|
|
* param userData User provided pointer to the application callback data.
|
|
*/
|
|
void LPI2C_SlaveTransferCreateHandle(LPI2C_Type *base,
|
|
lpi2c_slave_handle_t *handle,
|
|
lpi2c_slave_transfer_callback_t callback,
|
|
void *userData)
|
|
{
|
|
uint32_t instance;
|
|
|
|
assert(handle);
|
|
|
|
/* Clear out the handle. */
|
|
memset(handle, 0, sizeof(*handle));
|
|
|
|
/* Look up instance number */
|
|
instance = LPI2C_GetInstance(base);
|
|
|
|
/* Save base and instance. */
|
|
handle->callback = callback;
|
|
handle->userData = userData;
|
|
|
|
/* Save this handle for IRQ use. */
|
|
s_lpi2cSlaveHandle[instance] = handle;
|
|
|
|
/* Set irq handler. */
|
|
s_lpi2cSlaveIsr = LPI2C_SlaveTransferHandleIRQ;
|
|
|
|
/* Clear internal IRQ enables and enable NVIC IRQ. */
|
|
LPI2C_SlaveDisableInterrupts(base, kSlaveIrqFlags);
|
|
EnableIRQ(kLpi2cIrqs[instance]);
|
|
|
|
/* Nack by default. */
|
|
base->STAR = LPI2C_STAR_TXNACK_MASK;
|
|
}
|
|
|
|
/*!
|
|
* brief Starts accepting slave transfers.
|
|
*
|
|
* Call this API after calling I2C_SlaveInit() and LPI2C_SlaveTransferCreateHandle() to start processing
|
|
* transactions driven by an I2C master. The slave monitors the I2C bus and pass events to the
|
|
* callback that was passed into the call to LPI2C_SlaveTransferCreateHandle(). The callback is always invoked
|
|
* from the interrupt context.
|
|
*
|
|
* The set of events received by the callback is customizable. To do so, set the a eventMask parameter to
|
|
* the OR'd combination of #lpi2c_slave_transfer_event_t enumerators for the events you wish to receive.
|
|
* The #kLPI2C_SlaveTransmitEvent and #kLPI2C_SlaveReceiveEvent events are always enabled and do not need
|
|
* to be included in the mask. Alternatively, you can pass 0 to get a default set of only the transmit and
|
|
* receive events that are always enabled. In addition, the #kLPI2C_SlaveAllEvents constant is provided as
|
|
* a convenient way to enable all events.
|
|
*
|
|
* param base The LPI2C peripheral base address.
|
|
* param handle Pointer to #lpi2c_slave_handle_t structure which stores the transfer state.
|
|
* param eventMask Bit mask formed by OR'ing together #lpi2c_slave_transfer_event_t enumerators to specify
|
|
* which events to send to the callback. Other accepted values are 0 to get a default set of
|
|
* only the transmit and receive events, and #kLPI2C_SlaveAllEvents to enable all events.
|
|
*
|
|
* retval #kStatus_Success Slave transfers were successfully started.
|
|
* retval #kStatus_LPI2C_Busy Slave transfers have already been started on this handle.
|
|
*/
|
|
status_t LPI2C_SlaveTransferNonBlocking(LPI2C_Type *base, lpi2c_slave_handle_t *handle, uint32_t eventMask)
|
|
{
|
|
uint32_t status;
|
|
|
|
assert(handle);
|
|
|
|
/* Return busy if another transaction is in progress. */
|
|
if (handle->isBusy)
|
|
{
|
|
return kStatus_LPI2C_Busy;
|
|
}
|
|
|
|
/* Return an error if the bus is already in use not by us. */
|
|
status = LPI2C_SlaveGetStatusFlags(base);
|
|
if ((status & kLPI2C_SlaveBusBusyFlag) && (!(status & kLPI2C_SlaveBusyFlag)))
|
|
{
|
|
return kStatus_LPI2C_Busy;
|
|
}
|
|
|
|
/* Disable LPI2C IRQ sources while we configure stuff. */
|
|
LPI2C_SlaveDisableInterrupts(base, kSlaveIrqFlags);
|
|
|
|
/* Clear transfer in handle. */
|
|
memset(&handle->transfer, 0, sizeof(handle->transfer));
|
|
|
|
/* Record that we're busy. */
|
|
handle->isBusy = true;
|
|
|
|
/* Set up event mask. tx and rx are always enabled. */
|
|
handle->eventMask = eventMask | kLPI2C_SlaveTransmitEvent | kLPI2C_SlaveReceiveEvent;
|
|
|
|
/* Ack by default. */
|
|
base->STAR = 0;
|
|
|
|
/* Clear all flags. */
|
|
LPI2C_SlaveClearStatusFlags(base, kSlaveClearFlags);
|
|
|
|
/* Enable LPI2C internal IRQ sources. NVIC IRQ was enabled in CreateHandle() */
|
|
LPI2C_SlaveEnableInterrupts(base, kSlaveIrqFlags);
|
|
|
|
return kStatus_Success;
|
|
}
|
|
|
|
/*!
|
|
* brief Gets the slave transfer status during a non-blocking transfer.
|
|
* param base The LPI2C peripheral base address.
|
|
* param handle Pointer to i2c_slave_handle_t structure.
|
|
* param[out] count Pointer to a value to hold the number of bytes transferred. May be NULL if the count is not
|
|
* required.
|
|
* retval #kStatus_Success
|
|
* retval #kStatus_NoTransferInProgress
|
|
*/
|
|
status_t LPI2C_SlaveTransferGetCount(LPI2C_Type *base, lpi2c_slave_handle_t *handle, size_t *count)
|
|
{
|
|
assert(handle);
|
|
|
|
if (!count)
|
|
{
|
|
return kStatus_InvalidArgument;
|
|
}
|
|
|
|
/* Catch when there is not an active transfer. */
|
|
if (!handle->isBusy)
|
|
{
|
|
*count = 0;
|
|
return kStatus_NoTransferInProgress;
|
|
}
|
|
|
|
/* For an active transfer, just return the count from the handle. */
|
|
*count = handle->transferredCount;
|
|
|
|
return kStatus_Success;
|
|
}
|
|
|
|
/*!
|
|
* brief Aborts the slave non-blocking transfers.
|
|
* note This API could be called at any time to stop slave for handling the bus events.
|
|
* param base The LPI2C peripheral base address.
|
|
* param handle Pointer to #lpi2c_slave_handle_t structure which stores the transfer state.
|
|
* retval #kStatus_Success
|
|
* retval #kStatus_LPI2C_Idle
|
|
*/
|
|
void LPI2C_SlaveTransferAbort(LPI2C_Type *base, lpi2c_slave_handle_t *handle)
|
|
{
|
|
assert(handle);
|
|
|
|
/* Return idle if no transaction is in progress. */
|
|
if (handle->isBusy)
|
|
{
|
|
/* Disable LPI2C IRQ sources. */
|
|
LPI2C_SlaveDisableInterrupts(base, kSlaveIrqFlags);
|
|
|
|
/* Nack by default. */
|
|
base->STAR = LPI2C_STAR_TXNACK_MASK;
|
|
|
|
/* Reset transfer info. */
|
|
memset(&handle->transfer, 0, sizeof(handle->transfer));
|
|
|
|
/* We're no longer busy. */
|
|
handle->isBusy = false;
|
|
}
|
|
}
|
|
|
|
/*!
|
|
* brief Reusable routine to handle slave interrupts.
|
|
* note This function does not need to be called unless you are reimplementing the
|
|
* non blocking API's interrupt handler routines to add special functionality.
|
|
* param base The LPI2C peripheral base address.
|
|
* param handle Pointer to #lpi2c_slave_handle_t structure which stores the transfer state.
|
|
*/
|
|
void LPI2C_SlaveTransferHandleIRQ(LPI2C_Type *base, lpi2c_slave_handle_t *handle)
|
|
{
|
|
uint32_t flags;
|
|
lpi2c_slave_transfer_t *xfer;
|
|
|
|
/* Check for a valid handle in case of a spurious interrupt. */
|
|
if (!handle)
|
|
{
|
|
return;
|
|
}
|
|
|
|
xfer = &handle->transfer;
|
|
|
|
/* Get status flags. */
|
|
flags = LPI2C_SlaveGetStatusFlags(base);
|
|
|
|
if (flags & (kLPI2C_SlaveBitErrFlag | kLPI2C_SlaveFifoErrFlag))
|
|
{
|
|
xfer->event = kLPI2C_SlaveCompletionEvent;
|
|
xfer->completionStatus = LPI2C_SlaveCheckAndClearError(base, flags);
|
|
|
|
if ((handle->eventMask & kLPI2C_SlaveCompletionEvent) && (handle->callback))
|
|
{
|
|
handle->callback(base, xfer, handle->userData);
|
|
}
|
|
return;
|
|
}
|
|
if (flags & (kLPI2C_SlaveRepeatedStartDetectFlag | kLPI2C_SlaveStopDetectFlag))
|
|
{
|
|
xfer->event = (flags & kLPI2C_SlaveRepeatedStartDetectFlag) ? kLPI2C_SlaveRepeatedStartEvent :
|
|
kLPI2C_SlaveCompletionEvent;
|
|
xfer->receivedAddress = 0;
|
|
xfer->completionStatus = kStatus_Success;
|
|
xfer->transferredCount = handle->transferredCount;
|
|
|
|
if (xfer->event == kLPI2C_SlaveCompletionEvent)
|
|
{
|
|
handle->isBusy = false;
|
|
}
|
|
|
|
if (handle->wasTransmit)
|
|
{
|
|
/* Subtract one from the transmit count to offset the fact that LPI2C asserts the */
|
|
/* tx flag before it sees the nack from the master-receiver, thus causing one more */
|
|
/* count that the master actually receives. */
|
|
--xfer->transferredCount;
|
|
handle->wasTransmit = false;
|
|
}
|
|
|
|
/* Clear the flag. */
|
|
LPI2C_SlaveClearStatusFlags(base, flags & (kLPI2C_SlaveRepeatedStartDetectFlag | kLPI2C_SlaveStopDetectFlag));
|
|
|
|
/* Revert to sending an Ack by default, in case we sent a Nack for receive. */
|
|
base->STAR = 0;
|
|
|
|
if ((handle->eventMask & xfer->event) && (handle->callback))
|
|
{
|
|
handle->callback(base, xfer, handle->userData);
|
|
}
|
|
|
|
/* Clean up transfer info on completion, after the callback has been invoked. */
|
|
memset(&handle->transfer, 0, sizeof(handle->transfer));
|
|
}
|
|
if (flags & kLPI2C_SlaveAddressValidFlag)
|
|
{
|
|
xfer->event = kLPI2C_SlaveAddressMatchEvent;
|
|
xfer->receivedAddress = base->SASR & LPI2C_SASR_RADDR_MASK;
|
|
|
|
if ((handle->eventMask & kLPI2C_SlaveAddressMatchEvent) && (handle->callback))
|
|
{
|
|
handle->callback(base, xfer, handle->userData);
|
|
}
|
|
}
|
|
if (flags & kLPI2C_SlaveTransmitAckFlag)
|
|
{
|
|
xfer->event = kLPI2C_SlaveTransmitAckEvent;
|
|
|
|
if ((handle->eventMask & kLPI2C_SlaveTransmitAckEvent) && (handle->callback))
|
|
{
|
|
handle->callback(base, xfer, handle->userData);
|
|
}
|
|
}
|
|
|
|
/* Handle transmit and receive. */
|
|
if (flags & kLPI2C_SlaveTxReadyFlag)
|
|
{
|
|
handle->wasTransmit = true;
|
|
|
|
/* If we're out of data, invoke callback to get more. */
|
|
if ((!xfer->data) || (!xfer->dataSize))
|
|
{
|
|
xfer->event = kLPI2C_SlaveTransmitEvent;
|
|
if (handle->callback)
|
|
{
|
|
handle->callback(base, xfer, handle->userData);
|
|
}
|
|
|
|
/* Clear the transferred count now that we have a new buffer. */
|
|
handle->transferredCount = 0;
|
|
}
|
|
|
|
/* Transmit a byte. */
|
|
if ((xfer->data) && (xfer->dataSize))
|
|
{
|
|
base->STDR = *xfer->data++;
|
|
--xfer->dataSize;
|
|
++handle->transferredCount;
|
|
}
|
|
}
|
|
if (flags & kLPI2C_SlaveRxReadyFlag)
|
|
{
|
|
/* If we're out of room in the buffer, invoke callback to get another. */
|
|
if ((!xfer->data) || (!xfer->dataSize))
|
|
{
|
|
xfer->event = kLPI2C_SlaveReceiveEvent;
|
|
if (handle->callback)
|
|
{
|
|
handle->callback(base, xfer, handle->userData);
|
|
}
|
|
|
|
/* Clear the transferred count now that we have a new buffer. */
|
|
handle->transferredCount = 0;
|
|
}
|
|
|
|
/* Receive a byte. */
|
|
if ((xfer->data) && (xfer->dataSize))
|
|
{
|
|
*xfer->data++ = base->SRDR;
|
|
--xfer->dataSize;
|
|
++handle->transferredCount;
|
|
}
|
|
else
|
|
{
|
|
/* We don't have any room to receive more data, so send a nack. */
|
|
base->STAR = LPI2C_STAR_TXNACK_MASK;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*!
|
|
* @brief Shared IRQ handler that can call both master and slave ISRs.
|
|
*
|
|
* The master and slave ISRs are called through function pointers in order to decouple
|
|
* this code from the ISR functions. Without this, the linker would always pull in both
|
|
* ISRs and every function they call, even if only the functional API was used.
|
|
*
|
|
* @param base The LPI2C peripheral base address.
|
|
* @param instance The LPI2C peripheral instance number.
|
|
*/
|
|
static void LPI2C_CommonIRQHandler(LPI2C_Type *base, uint32_t instance)
|
|
{
|
|
/* Check for master IRQ. */
|
|
if ((base->MCR & LPI2C_MCR_MEN_MASK) && s_lpi2cMasterIsr)
|
|
{
|
|
/* Master mode. */
|
|
s_lpi2cMasterIsr(base, s_lpi2cMasterHandle[instance]);
|
|
}
|
|
|
|
/* Check for slave IRQ. */
|
|
if ((base->SCR & LPI2C_SCR_SEN_MASK) && s_lpi2cSlaveIsr)
|
|
{
|
|
/* Slave mode. */
|
|
s_lpi2cSlaveIsr(base, s_lpi2cSlaveHandle[instance]);
|
|
}
|
|
/* Add for ARM errata 838869, affects Cortex-M4, Cortex-M4F Store immediate overlapping
|
|
exception return operation might vector to incorrect interrupt */
|
|
#if defined __CORTEX_M && (__CORTEX_M == 4U)
|
|
__DSB();
|
|
#endif
|
|
}
|
|
|
|
#if defined(LPI2C0)
|
|
/* Implementation of LPI2C0 handler named in startup code. */
|
|
void LPI2C0_DriverIRQHandler(void)
|
|
{
|
|
LPI2C_CommonIRQHandler(LPI2C0, 0);
|
|
}
|
|
#endif
|
|
|
|
#if defined(LPI2C1)
|
|
/* Implementation of LPI2C1 handler named in startup code. */
|
|
void LPI2C1_DriverIRQHandler(void)
|
|
{
|
|
LPI2C_CommonIRQHandler(LPI2C1, 1);
|
|
}
|
|
#endif
|
|
|
|
#if defined(LPI2C2)
|
|
/* Implementation of LPI2C2 handler named in startup code. */
|
|
void LPI2C2_DriverIRQHandler(void)
|
|
{
|
|
LPI2C_CommonIRQHandler(LPI2C2, 2);
|
|
}
|
|
#endif
|
|
|
|
#if defined(LPI2C3)
|
|
/* Implementation of LPI2C3 handler named in startup code. */
|
|
void LPI2C3_DriverIRQHandler(void)
|
|
{
|
|
LPI2C_CommonIRQHandler(LPI2C3, 3);
|
|
}
|
|
#endif
|
|
|
|
#if defined(LPI2C4)
|
|
/* Implementation of LPI2C4 handler named in startup code. */
|
|
void LPI2C4_DriverIRQHandler(void)
|
|
{
|
|
LPI2C_CommonIRQHandler(LPI2C4, 4);
|
|
}
|
|
#endif
|
|
|
|
#if defined(CM4_0__LPI2C)
|
|
/* Implementation of CM4_0__LPI2C handler named in startup code. */
|
|
void M4_0_LPI2C_DriverIRQHandler(void)
|
|
{
|
|
LPI2C_CommonIRQHandler(CM4_0__LPI2C, LPI2C_GetInstance(CM4_0__LPI2C));
|
|
}
|
|
#endif
|
|
|
|
#if defined(CM4__LPI2C)
|
|
/* Implementation of CM4__LPI2C handler named in startup code. */
|
|
void M4_LPI2C_DriverIRQHandler(void)
|
|
{
|
|
LPI2C_CommonIRQHandler(CM4__LPI2C, LPI2C_GetInstance(CM4__LPI2C));
|
|
}
|
|
#endif
|
|
|
|
#if defined(CM4_1__LPI2C)
|
|
/* Implementation of CM4_1__LPI2C handler named in startup code. */
|
|
void M4_1_LPI2C_DriverIRQHandler(void)
|
|
{
|
|
LPI2C_CommonIRQHandler(CM4_1__LPI2C, LPI2C_GetInstance(CM4_1__LPI2C));
|
|
}
|
|
#endif
|
|
|
|
#if defined(DMA__LPI2C0)
|
|
/* Implementation of DMA__LPI2C0 handler named in startup code. */
|
|
void DMA_I2C0_INT_DriverIRQHandler(void)
|
|
{
|
|
LPI2C_CommonIRQHandler(DMA__LPI2C0, LPI2C_GetInstance(DMA__LPI2C0));
|
|
}
|
|
#endif
|
|
|
|
#if defined(DMA__LPI2C1)
|
|
/* Implementation of DMA__LPI2C1 handler named in startup code. */
|
|
void DMA_I2C1_INT_DriverIRQHandler(void)
|
|
{
|
|
LPI2C_CommonIRQHandler(DMA__LPI2C1, LPI2C_GetInstance(DMA__LPI2C1));
|
|
}
|
|
#endif
|
|
|
|
#if defined(DMA__LPI2C2)
|
|
/* Implementation of DMA__LPI2C2 handler named in startup code. */
|
|
void DMA_I2C2_INT_DriverIRQHandler(void)
|
|
{
|
|
LPI2C_CommonIRQHandler(DMA__LPI2C2, LPI2C_GetInstance(DMA__LPI2C2));
|
|
}
|
|
#endif
|
|
|
|
#if defined(DMA__LPI2C3)
|
|
/* Implementation of DMA__LPI2C3 handler named in startup code. */
|
|
void DMA_I2C3_INT_DriverIRQHandler(void)
|
|
{
|
|
LPI2C_CommonIRQHandler(DMA__LPI2C3, LPI2C_GetInstance(DMA__LPI2C3));
|
|
}
|
|
#endif
|
|
|
|
#if defined(DMA__LPI2C4)
|
|
/* Implementation of DMA__LPI2C3 handler named in startup code. */
|
|
void DMA_I2C4_INT_DriverIRQHandler(void)
|
|
{
|
|
LPI2C_CommonIRQHandler(DMA__LPI2C4, LPI2C_GetInstance(DMA__LPI2C4));
|
|
}
|
|
#endif
|
|
|
|
#if defined(ADMA__LPI2C0)
|
|
/* Implementation of DMA__LPI2C0 handler named in startup code. */
|
|
void ADMA_I2C0_INT_DriverIRQHandler(void)
|
|
{
|
|
LPI2C_CommonIRQHandler(ADMA__LPI2C0, LPI2C_GetInstance(ADMA__LPI2C0));
|
|
}
|
|
#endif
|
|
|
|
#if defined(ADMA__LPI2C1)
|
|
/* Implementation of DMA__LPI2C1 handler named in startup code. */
|
|
void ADMA_I2C1_INT_DriverIRQHandler(void)
|
|
{
|
|
LPI2C_CommonIRQHandler(ADMA__LPI2C1, LPI2C_GetInstance(ADMA__LPI2C1));
|
|
}
|
|
#endif
|
|
|
|
#if defined(ADMA__LPI2C2)
|
|
/* Implementation of DMA__LPI2C2 handler named in startup code. */
|
|
void ADMA_I2C2_INT_DriverIRQHandler(void)
|
|
{
|
|
LPI2C_CommonIRQHandler(ADMA__LPI2C2, LPI2C_GetInstance(ADMA__LPI2C2));
|
|
}
|
|
#endif
|
|
|
|
#if defined(ADMA__LPI2C3)
|
|
/* Implementation of DMA__LPI2C3 handler named in startup code. */
|
|
void ADMA_I2C3_INT_DriverIRQHandler(void)
|
|
{
|
|
LPI2C_CommonIRQHandler(ADMA__LPI2C3, LPI2C_GetInstance(ADMA__LPI2C3));
|
|
}
|
|
#endif
|
|
|
|
#if defined(ADMA__LPI2C4)
|
|
/* Implementation of DMA__LPI2C3 handler named in startup code. */
|
|
void ADMA_I2C4_INT_DriverIRQHandler(void)
|
|
{
|
|
LPI2C_CommonIRQHandler(ADMA__LPI2C4, LPI2C_GetInstance(ADMA__LPI2C4));
|
|
}
|
|
#endif
|