/**************************************************************************//** * @file clk.c * @version V3.00 * $Revision: 35 $ * $Date: 15/08/11 10:26a $ * @brief M451 series CLK driver source file * * @note * Copyright (C) 2014~2015 Nuvoton Technology Corp. All rights reserved. *****************************************************************************/ #include "M451Series.h" /** @addtogroup Standard_Driver Standard Driver @{ */ /** @addtogroup CLK_Driver CLK Driver @{ */ /** @addtogroup CLK_EXPORTED_FUNCTIONS CLK Exported Functions @{ */ /** * @brief Disable clock divider output function * @param None * @return None * @details This function disable clock divider output function. */ void CLK_DisableCKO(void) { /* Disable CKO clock source */ CLK_DisableModuleClock(CLKO_MODULE); } /** * @brief This function enable clock divider output module clock, * enable clock divider output function and set frequency selection. * @param[in] u32ClkSrc is frequency divider function clock source. Including : * - \ref CLK_CLKSEL1_CLKOSEL_HXT * - \ref CLK_CLKSEL1_CLKOSEL_LXT * - \ref CLK_CLKSEL1_CLKOSEL_HCLK * - \ref CLK_CLKSEL1_CLKOSEL_HIRC * @param[in] u32ClkDiv is divider output frequency selection. It could be 0~15. * @param[in] u32ClkDivBy1En is clock divided by one enabled. * @return None * @details Output selected clock to CKO. The output clock frequency is divided by u32ClkDiv. \n * The formula is: \n * CKO frequency = (Clock source frequency) / 2^(u32ClkDiv + 1) \n * This function is just used to set CKO clock. * User must enable I/O for CKO clock output pin by themselves. \n */ void CLK_EnableCKO(uint32_t u32ClkSrc, uint32_t u32ClkDiv, uint32_t u32ClkDivBy1En) { /* CKO = clock source / 2^(u32ClkDiv + 1) */ CLK->CLKOCTL = CLK_CLKOCTL_CLKOEN_Msk | u32ClkDiv | (u32ClkDivBy1En << CLK_CLKOCTL_DIV1EN_Pos); /* Enable CKO clock source */ CLK_EnableModuleClock(CLKO_MODULE); /* Select CKO clock source */ CLK_SetModuleClock(CLKO_MODULE, u32ClkSrc, 0); } /** * @brief Enter to Power-down mode * @param None * @return None * @details This function is used to let system enter to Power-down mode. \n * The register write-protection function should be disabled before using this function. */ void CLK_PowerDown(void) { /* Set the processor uses deep sleep as its low power mode */ SCB->SCR |= SCB_SCR_SLEEPDEEP_Msk; /* Set system Power-down enabled and Power-down entry condition */ CLK->PWRCTL |= (CLK_PWRCTL_PDEN_Msk | CLK_PWRCTL_PDWTCPU_Msk); /* Chip enter Power-down mode after CPU run WFI instruction */ __WFI(); } /** * @brief Enter to Idle mode * @param None * @return None * @details This function let system enter to Idle mode. \n * The register write-protection function should be disabled before using this function. */ void CLK_Idle(void) { /* Set the processor uses sleep as its low power mode */ SCB->SCR &= ~SCB_SCR_SLEEPDEEP_Msk; /* Set chip in idle mode because of WFI command */ CLK->PWRCTL &= ~CLK_PWRCTL_PDEN_Msk; /* Chip enter idle mode after CPU run WFI instruction */ __WFI(); } /** * @brief Get external high speed crystal clock frequency * @param None * @return External high frequency crystal frequency * @details This function get external high frequency crystal frequency. The frequency unit is Hz. */ uint32_t CLK_GetHXTFreq(void) { if(CLK->PWRCTL & CLK_PWRCTL_HXTEN_Msk) return __HXT; else return 0; } /** * @brief Get external low speed crystal clock frequency * @param None * @return External low speed crystal clock frequency * @details This function get external low frequency crystal frequency. The frequency unit is Hz. */ uint32_t CLK_GetLXTFreq(void) { if(CLK->PWRCTL & CLK_PWRCTL_LXTEN_Msk) return __LXT; else return 0; } /** * @brief Get PCLK0 frequency * @param None * @return PCLK0 frequency * @details This function get PCLK0 frequency. The frequency unit is Hz. */ uint32_t CLK_GetPCLK0Freq(void) { SystemCoreClockUpdate(); if(CLK->CLKSEL0 & CLK_CLKSEL0_PCLK0SEL_Msk) return SystemCoreClock / 2; else return SystemCoreClock; } /** * @brief Get PCLK1 frequency * @param None * @return PCLK1 frequency * @details This function get PCLK1 frequency. The frequency unit is Hz. */ uint32_t CLK_GetPCLK1Freq(void) { SystemCoreClockUpdate(); if(CLK->CLKSEL0 & CLK_CLKSEL0_PCLK1SEL_Msk) return SystemCoreClock / 2; else return SystemCoreClock; } /** * @brief Get HCLK frequency * @param None * @return HCLK frequency * @details This function get HCLK frequency. The frequency unit is Hz. */ uint32_t CLK_GetHCLKFreq(void) { SystemCoreClockUpdate(); return SystemCoreClock; } /** * @brief Get CPU frequency * @param None * @return CPU frequency * @details This function get CPU frequency. The frequency unit is Hz. */ uint32_t CLK_GetCPUFreq(void) { SystemCoreClockUpdate(); return SystemCoreClock; } /** * @brief Set HCLK frequency * @param[in] u32Hclk is HCLK frequency. The range of u32Hclk is 25 MHz ~ 72 MHz. * @return HCLK frequency * @details This function is used to set HCLK frequency. The frequency unit is Hz. \n * It would configure PLL frequency to 50MHz ~ 144MHz, * set HCLK clock divider as 2 and switch HCLK clock source to PLL. \n * The register write-protection function should be disabled before using this function. */ uint32_t CLK_SetCoreClock(uint32_t u32Hclk) { uint32_t u32HIRCSTB; /* Read HIRC clock source stable flag */ u32HIRCSTB = CLK->STATUS & CLK_STATUS_HIRCSTB_Msk; /* The range of u32Hclk is 25 MHz ~ 72 MHz */ if(u32Hclk > FREQ_72MHZ) u32Hclk = FREQ_72MHZ; if(u32Hclk < FREQ_25MHZ) u32Hclk = FREQ_25MHZ; /* Switch HCLK clock source to HIRC clock for safe */ CLK->PWRCTL |= CLK_PWRCTL_HIRCEN_Msk; CLK_WaitClockReady(CLK_STATUS_HIRCSTB_Msk); CLK->CLKSEL0 |= CLK_CLKSEL0_HCLKSEL_Msk; CLK->CLKDIV0 &= (~CLK_CLKDIV0_HCLKDIV_Msk); /* Configure PLL setting if HXT clock is enabled */ if(CLK->PWRCTL & CLK_PWRCTL_HXTEN_Msk) u32Hclk = CLK_EnablePLL(CLK_PLLCTL_PLLSRC_HXT, (u32Hclk << 1)); /* Configure PLL setting if HXT clock is not enabled */ else { u32Hclk = CLK_EnablePLL(CLK_PLLCTL_PLLSRC_HIRC, (u32Hclk << 1)); /* Read HIRC clock source stable flag */ u32HIRCSTB = CLK->STATUS & CLK_STATUS_HIRCSTB_Msk; } /* Select HCLK clock source to PLL, Select HCLK clock source divider as 2 and update system core clock */ CLK_SetHCLK(CLK_CLKSEL0_HCLKSEL_PLL, CLK_CLKDIV0_HCLK(2)); /* Disable HIRC if HIRC is disabled before setting core clock */ if(u32HIRCSTB == 0) CLK->PWRCTL &= ~CLK_PWRCTL_HIRCEN_Msk; /* Return actually HCLK frequency is PLL frequency divide 2 */ return u32Hclk >> 1; } /** * @brief This function set HCLK clock source and HCLK clock divider * @param[in] u32ClkSrc is HCLK clock source. Including : * - \ref CLK_CLKSEL0_HCLKSEL_HXT * - \ref CLK_CLKSEL0_HCLKSEL_LXT * - \ref CLK_CLKSEL0_HCLKSEL_PLL * - \ref CLK_CLKSEL0_HCLKSEL_LIRC * - \ref CLK_CLKSEL0_HCLKSEL_HIRC * @param[in] u32ClkDiv is HCLK clock divider. Including : * - \ref CLK_CLKDIV0_HCLK(x) * @return None * @details This function set HCLK clock source and HCLK clock divider. \n * The register write-protection function should be disabled before using this function. */ void CLK_SetHCLK(uint32_t u32ClkSrc, uint32_t u32ClkDiv) { uint32_t u32HIRCSTB; /* Read HIRC clock source stable flag */ u32HIRCSTB = CLK->STATUS & CLK_STATUS_HIRCSTB_Msk; /* Switch to HIRC for Safe. Avoid HCLK too high when applying new divider. */ CLK->PWRCTL |= CLK_PWRCTL_HIRCEN_Msk; CLK_WaitClockReady(CLK_STATUS_HIRCSTB_Msk); CLK->CLKSEL0 = (CLK->CLKSEL0 & (~CLK_CLKSEL0_HCLKSEL_Msk)) | CLK_CLKSEL0_HCLKSEL_HIRC; /* Apply new Divider */ CLK->CLKDIV0 = (CLK->CLKDIV0 & (~CLK_CLKDIV0_HCLKDIV_Msk)) | u32ClkDiv; /* Switch HCLK to new HCLK source */ CLK->CLKSEL0 = (CLK->CLKSEL0 & (~CLK_CLKSEL0_HCLKSEL_Msk)) | u32ClkSrc; /* Update System Core Clock */ SystemCoreClockUpdate(); /* Disable HIRC if HIRC is disabled before switching HCLK source */ if(u32HIRCSTB == 0) CLK->PWRCTL &= ~CLK_PWRCTL_HIRCEN_Msk; } /** * @brief This function set selected module clock source and module clock divider * @param[in] u32ModuleIdx is module index. * @param[in] u32ClkSrc is module clock source. * @param[in] u32ClkDiv is module clock divider. * @return None * @details Valid parameter combinations listed in following table: * * |Module index |Clock source |Divider | * | :---------------- | :----------------------------------- | :---------------------- | * |\ref WDT_MODULE |\ref CLK_CLKSEL1_WDTSEL_LXT | x | * |\ref WDT_MODULE |\ref CLK_CLKSEL1_WDTSEL_PCLK0_DIV2048 | x | * |\ref WDT_MODULE |\ref CLK_CLKSEL1_WDTSEL_LIRC | x | * |\ref RTC_MODULE |\ref CLK_CLKSEL3_RTCSEL_LXT | x | * |\ref RTC_MODULE |\ref CLK_CLKSEL3_RTCSEL_LIRC | x | * |\ref TMR0_MODULE |\ref CLK_CLKSEL1_TMR0SEL_HXT | x | * |\ref TMR0_MODULE |\ref CLK_CLKSEL1_TMR0SEL_LXT | x | * |\ref TMR0_MODULE |\ref CLK_CLKSEL1_TMR0SEL_PCLK0 | x | * |\ref TMR0_MODULE |\ref CLK_CLKSEL1_TMR0SEL_EXT_TRG | x | * |\ref TMR0_MODULE |\ref CLK_CLKSEL1_TMR0SEL_LIRC | x | * |\ref TMR0_MODULE |\ref CLK_CLKSEL1_TMR0SEL_HIRC | x | * |\ref TMR1_MODULE |\ref CLK_CLKSEL1_TMR1SEL_HXT | x | * |\ref TMR1_MODULE |\ref CLK_CLKSEL1_TMR1SEL_LXT | x | * |\ref TMR1_MODULE |\ref CLK_CLKSEL1_TMR1SEL_PCLK0 | x | * |\ref TMR1_MODULE |\ref CLK_CLKSEL1_TMR1SEL_EXT_TRG | x | * |\ref TMR1_MODULE |\ref CLK_CLKSEL1_TMR1SEL_LIRC | x | * |\ref TMR1_MODULE |\ref CLK_CLKSEL1_TMR1SEL_HIRC | x | * |\ref TMR2_MODULE |\ref CLK_CLKSEL1_TMR2SEL_HXT | x | * |\ref TMR2_MODULE |\ref CLK_CLKSEL1_TMR2SEL_LXT | x | * |\ref TMR2_MODULE |\ref CLK_CLKSEL1_TMR2SEL_PCLK1 | x | * |\ref TMR2_MODULE |\ref CLK_CLKSEL1_TMR2SEL_EXT_TRG | x | * |\ref TMR2_MODULE |\ref CLK_CLKSEL1_TMR2SEL_LIRC | x | * |\ref TMR2_MODULE |\ref CLK_CLKSEL1_TMR2SEL_HIRC | x | * |\ref TMR3_MODULE |\ref CLK_CLKSEL1_TMR3SEL_HXT | x | * |\ref TMR3_MODULE |\ref CLK_CLKSEL1_TMR3SEL_LXT | x | * |\ref TMR3_MODULE |\ref CLK_CLKSEL1_TMR3SEL_PCLK1 | x | * |\ref TMR3_MODULE |\ref CLK_CLKSEL1_TMR3SEL_EXT_TRG | x | * |\ref TMR3_MODULE |\ref CLK_CLKSEL1_TMR3SEL_LIRC | x | * |\ref TMR3_MODULE |\ref CLK_CLKSEL1_TMR3SEL_HIRC | x | * |\ref CLKO_MODULE |\ref CLK_CLKSEL1_CLKOSEL_HXT | x | * |\ref CLKO_MODULE |\ref CLK_CLKSEL1_CLKOSEL_LXT | x | * |\ref CLKO_MODULE |\ref CLK_CLKSEL1_CLKOSEL_HCLK | x | * |\ref CLKO_MODULE |\ref CLK_CLKSEL1_CLKOSEL_HIRC | x | * |\ref SPI0_MODULE |\ref CLK_CLKSEL2_SPI0SEL_HXT | x | * |\ref SPI0_MODULE |\ref CLK_CLKSEL2_SPI0SEL_PLL | x | * |\ref SPI0_MODULE |\ref CLK_CLKSEL2_SPI0SEL_PCLK0 | x | * |\ref SPI0_MODULE |\ref CLK_CLKSEL2_SPI0SEL_HIRC | x | * |\ref SPI1_MODULE |\ref CLK_CLKSEL2_SPI1SEL_HXT | x | * |\ref SPI1_MODULE |\ref CLK_CLKSEL2_SPI1SEL_PLL | x | * |\ref SPI1_MODULE |\ref CLK_CLKSEL2_SPI1SEL_PCLK1 | x | * |\ref SPI1_MODULE |\ref CLK_CLKSEL2_SPI1SEL_HIRC | x | * |\ref SPI2_MODULE |\ref CLK_CLKSEL2_SPI2SEL_HXT | x | * |\ref SPI2_MODULE |\ref CLK_CLKSEL2_SPI2SEL_PLL | x | * |\ref SPI2_MODULE |\ref CLK_CLKSEL2_SPI2SEL_PCLK0 | x | * |\ref SPI2_MODULE |\ref CLK_CLKSEL2_SPI2SEL_HIRC | x | * |\ref UART0_MODULE |\ref CLK_CLKSEL1_UARTSEL_HXT |\ref CLK_CLKDIV0_UART(x) | * |\ref UART0_MODULE |\ref CLK_CLKSEL1_UARTSEL_PLL |\ref CLK_CLKDIV0_UART(x) | * |\ref UART0_MODULE |\ref CLK_CLKSEL1_UARTSEL_LXT |\ref CLK_CLKDIV0_UART(x) | * |\ref UART0_MODULE |\ref CLK_CLKSEL1_UARTSEL_HIRC |\ref CLK_CLKDIV0_UART(x) | * |\ref UART1_MODULE |\ref CLK_CLKSEL1_UARTSEL_HXT |\ref CLK_CLKDIV0_UART(x) | * |\ref UART1_MODULE |\ref CLK_CLKSEL1_UARTSEL_PLL |\ref CLK_CLKDIV0_UART(x) | * |\ref UART1_MODULE |\ref CLK_CLKSEL1_UARTSEL_LXT |\ref CLK_CLKDIV0_UART(x) | * |\ref UART1_MODULE |\ref CLK_CLKSEL1_UARTSEL_HIRC |\ref CLK_CLKDIV0_UART(x) | * |\ref UART2_MODULE |\ref CLK_CLKSEL1_UARTSEL_HXT |\ref CLK_CLKDIV0_UART(x) | * |\ref UART2_MODULE |\ref CLK_CLKSEL1_UARTSEL_PLL |\ref CLK_CLKDIV0_UART(x) | * |\ref UART2_MODULE |\ref CLK_CLKSEL1_UARTSEL_LXT |\ref CLK_CLKDIV0_UART(x) | * |\ref UART2_MODULE |\ref CLK_CLKSEL1_UARTSEL_HIRC |\ref CLK_CLKDIV0_UART(x) | * |\ref UART3_MODULE |\ref CLK_CLKSEL1_UARTSEL_HXT |\ref CLK_CLKDIV0_UART(x) | * |\ref UART3_MODULE |\ref CLK_CLKSEL1_UARTSEL_LXT |\ref CLK_CLKDIV0_UART(x) | * |\ref UART3_MODULE |\ref CLK_CLKSEL1_UARTSEL_PLL |\ref CLK_CLKDIV0_UART(x) | * |\ref UART3_MODULE |\ref CLK_CLKSEL1_UARTSEL_HIRC |\ref CLK_CLKDIV0_UART(x) | * |\ref USBH_MODULE | x |\ref CLK_CLKDIV0_USB(x) | * |\ref USBD_MODULE | x |\ref CLK_CLKDIV0_USB(x) | * |\ref OTG_MODULE | x |\ref CLK_CLKDIV0_USB(x) | * |\ref EADC_MODULE | x |\ref CLK_CLKDIV0_EADC(x) | * |\ref SC0_MODULE |\ref CLK_CLKSEL3_SC0SEL_HXT |\ref CLK_CLKDIV1_SC0(x) | * |\ref SC0_MODULE |\ref CLK_CLKSEL3_SC0SEL_PLL |\ref CLK_CLKDIV1_SC0(x) | * |\ref SC0_MODULE |\ref CLK_CLKSEL3_SC0SEL_PCLK0 |\ref CLK_CLKDIV1_SC0(x) | * |\ref SC0_MODULE |\ref CLK_CLKSEL3_SC0SEL_HIRC |\ref CLK_CLKDIV1_SC0(x) | * |\ref PWM0_MODULE |\ref CLK_CLKSEL2_PWM0SEL_PLL | x | * |\ref PWM0_MODULE |\ref CLK_CLKSEL2_PWM0SEL_PCLK0 | x | * |\ref PWM1_MODULE |\ref CLK_CLKSEL2_PWM1SEL_PLL | x | * |\ref PWM1_MODULE |\ref CLK_CLKSEL2_PWM1SEL_PCLK1 | x | * |\ref WWDT_MODULE |\ref CLK_CLKSEL1_WWDTSEL_PCLK0_DIV2048 | x | * |\ref WWDT_MODULE |\ref CLK_CLKSEL1_WWDTSEL_LIRC | x | */ void CLK_SetModuleClock(uint32_t u32ModuleIdx, uint32_t u32ClkSrc, uint32_t u32ClkDiv) { uint32_t u32sel = 0, u32div = 0; if(MODULE_CLKDIV_Msk(u32ModuleIdx) != MODULE_NoMsk) { /* Get clock divider control register address */ u32div = (uint32_t)&CLK->CLKDIV0 + ((MODULE_CLKDIV(u32ModuleIdx)) * 4); /* Apply new divider */ M32(u32div) = (M32(u32div) & (~(MODULE_CLKDIV_Msk(u32ModuleIdx) << MODULE_CLKDIV_Pos(u32ModuleIdx)))) | u32ClkDiv; } if(MODULE_CLKSEL_Msk(u32ModuleIdx) != MODULE_NoMsk) { /* Get clock select control register address */ u32sel = (uint32_t)&CLK->CLKSEL0 + ((MODULE_CLKSEL(u32ModuleIdx)) * 4); /* Set new clock selection setting */ M32(u32sel) = (M32(u32sel) & (~(MODULE_CLKSEL_Msk(u32ModuleIdx) << MODULE_CLKSEL_Pos(u32ModuleIdx)))) | u32ClkSrc; } } /** * @brief Set SysTick clock source * @param[in] u32ClkSrc is module clock source. Including: * - \ref CLK_CLKSEL0_STCLKSEL_HXT * - \ref CLK_CLKSEL0_STCLKSEL_LXT * - \ref CLK_CLKSEL0_STCLKSEL_HXT_DIV2 * - \ref CLK_CLKSEL0_STCLKSEL_HCLK_DIV2 * - \ref CLK_CLKSEL0_STCLKSEL_HIRC_DIV2 * @return None * @details This function set SysTick clock source. \n * The register write-protection function should be disabled before using this function. */ void CLK_SetSysTickClockSrc(uint32_t u32ClkSrc) { CLK->CLKSEL0 = (CLK->CLKSEL0 & ~CLK_CLKSEL0_STCLKSEL_Msk) | u32ClkSrc; } /** * @brief Enable clock source * @param[in] u32ClkMask is clock source mask. Including : * - \ref CLK_PWRCTL_HXTEN_Msk * - \ref CLK_PWRCTL_LXTEN_Msk * - \ref CLK_PWRCTL_HIRCEN_Msk * - \ref CLK_PWRCTL_LIRCEN_Msk * @return None * @details This function enable clock source. \n * The register write-protection function should be disabled before using this function. */ void CLK_EnableXtalRC(uint32_t u32ClkMask) { CLK->PWRCTL |= u32ClkMask; } /** * @brief Disable clock source * @param[in] u32ClkMask is clock source mask. Including : * - \ref CLK_PWRCTL_HXTEN_Msk * - \ref CLK_PWRCTL_LXTEN_Msk * - \ref CLK_PWRCTL_HIRCEN_Msk * - \ref CLK_PWRCTL_LIRCEN_Msk * @return None * @details This function disable clock source. \n * The register write-protection function should be disabled before using this function. */ void CLK_DisableXtalRC(uint32_t u32ClkMask) { CLK->PWRCTL &= ~u32ClkMask; } /** * @brief Enable module clock * @param[in] u32ModuleIdx is module index. Including : * - \ref PDMA_MODULE * - \ref ISP_MODULE * - \ref EBI_MODULE * - \ref USBH_MODULE * - \ref CRC_MODULE * - \ref WDT_MODULE * - \ref WWDT_MODULE * - \ref RTC_MODULE * - \ref TMR0_MODULE * - \ref TMR1_MODULE * - \ref TMR2_MODULE * - \ref TMR3_MODULE * - \ref CLKO_MODULE * - \ref ACMP01_MODULE * - \ref I2C0_MODULE * - \ref I2C1_MODULE * - \ref SPI0_MODULE * - \ref SPI1_MODULE * - \ref SPI2_MODULE * - \ref UART0_MODULE * - \ref UART1_MODULE * - \ref UART2_MODULE * - \ref UART3_MODULE * - \ref CAN0_MODULE * - \ref OTG_MODULE * - \ref USBD_MODULE * - \ref EADC_MODULE * - \ref SC0_MODULE * - \ref DAC_MODULE * - \ref PWM0_MODULE * - \ref PWM1_MODULE * - \ref TK_MODULE * @return None * @details This function is used to enable module clock. */ void CLK_EnableModuleClock(uint32_t u32ModuleIdx) { *(volatile uint32_t *)((uint32_t)&CLK->AHBCLK + (MODULE_APBCLK(u32ModuleIdx) * 4)) |= 1 << MODULE_IP_EN_Pos(u32ModuleIdx); } /** * @brief Disable module clock * @param[in] u32ModuleIdx is module index. Including : * - \ref PDMA_MODULE * - \ref ISP_MODULE * - \ref EBI_MODULE * - \ref USBH_MODULE * - \ref CRC_MODULE * - \ref WDT_MODULE * - \ref WWDT_MODULE * - \ref RTC_MODULE * - \ref TMR0_MODULE * - \ref TMR1_MODULE * - \ref TMR2_MODULE * - \ref TMR3_MODULE * - \ref CLKO_MODULE * - \ref ACMP01_MODULE * - \ref I2C0_MODULE * - \ref I2C1_MODULE * - \ref SPI0_MODULE * - \ref SPI1_MODULE * - \ref SPI2_MODULE * - \ref UART0_MODULE * - \ref UART1_MODULE * - \ref UART2_MODULE * - \ref UART3_MODULE * - \ref CAN0_MODULE * - \ref OTG_MODULE * - \ref USBD_MODULE * - \ref EADC_MODULE * - \ref SC0_MODULE * - \ref DAC_MODULE * - \ref PWM0_MODULE * - \ref PWM1_MODULE * - \ref TK_MODULE * @return None * @details This function is used to disable module clock. */ void CLK_DisableModuleClock(uint32_t u32ModuleIdx) { *(volatile uint32_t *)((uint32_t)&CLK->AHBCLK + (MODULE_APBCLK(u32ModuleIdx) * 4)) &= ~(1 << MODULE_IP_EN_Pos(u32ModuleIdx)); } /** * @brief Set PLL frequency * @param[in] u32PllClkSrc is PLL clock source. Including : * - \ref CLK_PLLCTL_PLLSRC_HXT * - \ref CLK_PLLCTL_PLLSRC_HIRC * @param[in] u32PllFreq is PLL frequency. * @return PLL frequency * @details This function is used to configure PLLCTL register to set specified PLL frequency. \n * The register write-protection function should be disabled before using this function. */ uint32_t CLK_EnablePLL(uint32_t u32PllClkSrc, uint32_t u32PllFreq) { uint32_t u32PllSrcClk, u32NR, u32NF, u32NO, u32CLK_SRC; uint32_t u32Tmp, u32Tmp2, u32Tmp3, u32Min, u32MinNF, u32MinNR; /* Disable PLL first to avoid unstable when setting PLL */ CLK_DisablePLL(); /* PLL source clock is from HXT */ if(u32PllClkSrc == CLK_PLLCTL_PLLSRC_HXT) { /* Enable HXT clock */ CLK->PWRCTL |= CLK_PWRCTL_HXTEN_Msk; /* Wait for HXT clock ready */ CLK_WaitClockReady(CLK_STATUS_HXTSTB_Msk); /* Select PLL source clock from HXT */ u32CLK_SRC = CLK_PLLCTL_PLLSRC_HXT; u32PllSrcClk = __HXT; /* u32NR start from 2 */ u32NR = 2; } /* PLL source clock is from HIRC */ else { /* Enable HIRC clock */ CLK->PWRCTL |= CLK_PWRCTL_HIRCEN_Msk; /* Wait for HIRC clock ready */ CLK_WaitClockReady(CLK_STATUS_HIRCSTB_Msk); /* Select PLL source clock from HIRC */ u32CLK_SRC = CLK_PLLCTL_PLLSRC_HIRC; u32PllSrcClk = __HIRC; /* u32NR start from 4 when FIN = 22.1184MHz to avoid calculation overflow */ u32NR = 4; } /* Select "NO" according to request frequency */ if((u32PllFreq <= FREQ_500MHZ) && (u32PllFreq > FREQ_250MHZ)) { u32NO = 0; } else if((u32PllFreq <= FREQ_250MHZ) && (u32PllFreq > FREQ_125MHZ)) { u32NO = 1; u32PllFreq = u32PllFreq << 1; } else if((u32PllFreq <= FREQ_125MHZ) && (u32PllFreq >= FREQ_50MHZ)) { u32NO = 3; u32PllFreq = u32PllFreq << 2; } else { /* Wrong frequency request. Just return default setting. */ goto lexit; } /* Find best solution */ u32Min = (uint32_t) - 1; u32MinNR = 0; u32MinNF = 0; for(; u32NR <= 33; u32NR++) { u32Tmp = u32PllSrcClk / u32NR; if((u32Tmp > 1600000) && (u32Tmp < 16000000)) { for(u32NF = 2; u32NF <= 513; u32NF++) { u32Tmp2 = u32Tmp * u32NF; if((u32Tmp2 >= 200000000) && (u32Tmp2 <= 500000000)) { u32Tmp3 = (u32Tmp2 > u32PllFreq) ? u32Tmp2 - u32PllFreq : u32PllFreq - u32Tmp2; if(u32Tmp3 < u32Min) { u32Min = u32Tmp3; u32MinNR = u32NR; u32MinNF = u32NF; /* Break when get good results */ if(u32Min == 0) break; } } } } } /* Enable and apply new PLL setting. */ CLK->PLLCTL = u32CLK_SRC | (u32NO << 14) | ((u32MinNR - 2) << 9) | (u32MinNF - 2); /* Wait for PLL clock stable */ CLK_WaitClockReady(CLK_STATUS_PLLSTB_Msk); /* Return actual PLL output clock frequency */ return u32PllSrcClk / ((u32NO + 1) * u32MinNR) * u32MinNF; lexit: /* Apply default PLL setting and return */ if(u32PllClkSrc == CLK_PLLCTL_PLLSRC_HXT) CLK->PLLCTL = CLK_PLLCTL_72MHz_HXT; /* 72MHz */ else CLK->PLLCTL = CLK_PLLCTL_72MHz_HIRC; /* 71.8848MHz */ /* Wait for PLL clock stable */ CLK_WaitClockReady(CLK_STATUS_PLLSTB_Msk); return CLK_GetPLLClockFreq(); } /** * @brief Disable PLL * @param None * @return None * @details This function set PLL in Power-down mode. \n * The register write-protection function should be disabled before using this function. */ void CLK_DisablePLL(void) { CLK->PLLCTL |= CLK_PLLCTL_PD_Msk; } /** * @brief This function check selected clock source status * @param[in] u32ClkMask is selected clock source. Including : * - \ref CLK_STATUS_HXTSTB_Msk * - \ref CLK_STATUS_LXTSTB_Msk * - \ref CLK_STATUS_HIRCSTB_Msk * - \ref CLK_STATUS_LIRCSTB_Msk * - \ref CLK_STATUS_PLLSTB_Msk * @retval 0 clock is not stable * @retval 1 clock is stable * @details To wait for clock ready by specified clock source stable flag or timeout (~300ms) */ uint32_t CLK_WaitClockReady(uint32_t u32ClkMask) { int32_t i32TimeOutCnt = 2160000; while((CLK->STATUS & u32ClkMask) != u32ClkMask) { if(i32TimeOutCnt-- <= 0) return 0; } return 1; } /** * @brief Enable System Tick counter * @param[in] u32ClkSrc is System Tick clock source. Including: * - \ref CLK_CLKSEL0_STCLKSEL_HXT * - \ref CLK_CLKSEL0_STCLKSEL_LXT * - \ref CLK_CLKSEL0_STCLKSEL_HXT_DIV2 * - \ref CLK_CLKSEL0_STCLKSEL_HCLK_DIV2 * - \ref CLK_CLKSEL0_STCLKSEL_HIRC_DIV2 * - \ref CLK_CLKSEL0_STCLKSEL_HCLK * @param[in] u32Count is System Tick reload value. It could be 0~0xFFFFFF. * @return None * @details This function set System Tick clock source, reload value, enable System Tick counter and interrupt. \n * The register write-protection function should be disabled before using this function. */ void CLK_EnableSysTick(uint32_t u32ClkSrc, uint32_t u32Count) { /* Set System Tick counter disabled */ SysTick->CTRL = 0; /* Set System Tick clock source */ if( u32ClkSrc == CLK_CLKSEL0_STCLKSEL_HCLK ) SysTick->CTRL |= SysTick_CTRL_CLKSOURCE_Msk; else CLK->CLKSEL0 = (CLK->CLKSEL0 & ~CLK_CLKSEL0_STCLKSEL_Msk) | u32ClkSrc; /* Set System Tick reload value */ SysTick->LOAD = u32Count; /* Clear System Tick current value and counter flag */ SysTick->VAL = 0; /* Set System Tick interrupt enabled and counter enabled */ SysTick->CTRL |= SysTick_CTRL_TICKINT_Msk | SysTick_CTRL_ENABLE_Msk; } /** * @brief Disable System Tick counter * @param None * @return None * @details This function disable System Tick counter. */ void CLK_DisableSysTick(void) { /* Set System Tick counter disabled */ SysTick->CTRL = 0; } /*@}*/ /* end of group CLK_EXPORTED_FUNCTIONS */ /*@}*/ /* end of group CLK_Driver */ /*@}*/ /* end of group Standard_Driver */ /*** (C) COPYRIGHT 2014~2015 Nuvoton Technology Corp. ***/