| /** |
| ****************************************************************************** |
| * @file stm32l0xx_hal_rcc.c |
| * @author MCD Application Team |
| * @brief RCC HAL module driver. |
| * This file provides firmware functions to manage the following |
| * functionalities of the Reset and Clock Control (RCC) peripheral: |
| * + Initialization and de-initialization functions |
| * + Peripheral Control functions |
| * |
| @verbatim |
| ============================================================================== |
| ##### RCC specific features ##### |
| ============================================================================== |
| [..] |
| After reset the device is running from multispeed internal oscillator clock |
| (MSI 2.097MHz) with Flash 0 wait state and Flash prefetch buffer is disabled, |
| and all peripherals are off except internal SRAM, Flash and JTAG. |
| (+) There is no prescaler on High speed (AHB) and Low speed (APB) buses; |
| all peripherals mapped on these buses are running at MSI speed. |
| (+) The clock for all peripherals is switched off, except the SRAM and FLASH. |
| (+) All GPIOs are in input floating state, except the JTAG pins which |
| are assigned to be used for debug purpose. |
| [..] Once the device started from reset, the user application has to: |
| (+) Configure the clock source to be used to drive the System clock |
| (if the application needs higher frequency/performance) |
| (+) Configure the System clock frequency and Flash settings |
| (+) Configure the AHB and APB buses prescalers |
| (+) Enable the clock for the peripheral(s) to be used |
| (+) Configure the clock source(s) for peripherals whose clocks are not |
| derived from the System clock (I2S, RTC, ADC, USB OTG FS/SDIO/RNG) |
| (*) SDIO only for STM32L0xxxD devices |
| |
| ##### RCC Limitations ##### |
| ============================================================================== |
| [..] |
| A delay between an RCC peripheral clock enable and the effective peripheral |
| enabling should be taken into account in order to manage the peripheral read/write |
| from/to registers. |
| (+) This delay depends on the peripheral mapping. |
| (++) AHB & APB peripherals, 1 dummy read is necessary |
| |
| [..] |
| Workarounds: |
| (#) For AHB & APB peripherals, a dummy read to the peripheral register has been |
| inserted in each __HAL_RCC_PPP_CLK_ENABLE() macro. |
| |
| @endverbatim |
| ****************************************************************************** |
| * @attention |
| * |
| * Copyright (c) 2016 STMicroelectronics. |
| * All rights reserved. |
| * |
| * This software is licensed under terms that can be found in the LICENSE file in |
| * the root directory of this software component. |
| * If no LICENSE file comes with this software, it is provided AS-IS. |
| ****************************************************************************** |
| */ |
| |
| /* Includes ------------------------------------------------------------------*/ |
| #include "stm32l0xx_hal.h" |
| |
| /** @addtogroup STM32L0xx_HAL_Driver |
| * @{ |
| */ |
| |
| /** @defgroup RCC RCC |
| * @brief RCC HAL module driver |
| * @{ |
| */ |
| |
| #ifdef HAL_RCC_MODULE_ENABLED |
| |
| /* Private typedef -----------------------------------------------------------*/ |
| /* Private define ------------------------------------------------------------*/ |
| /* Private macro -------------------------------------------------------------*/ |
| /** @defgroup RCC_Private_Macros RCC Private Macros |
| * @{ |
| */ |
| |
| #define MCO1_CLK_ENABLE() __HAL_RCC_GPIOA_CLK_ENABLE() |
| #define MCO1_GPIO_PORT GPIOA |
| #define MCO1_PIN GPIO_PIN_8 |
| |
| #define MCO2_CLK_ENABLE() __HAL_RCC_GPIOA_CLK_ENABLE() |
| #define MCO2_GPIO_PORT GPIOA |
| #define MCO2_PIN GPIO_PIN_9 |
| |
| #if defined(RCC_MCO3_SUPPORT) |
| #define MCO3_CLK_ENABLE() __HAL_RCC_GPIOB_CLK_ENABLE() |
| #define MCO3_GPIO_PORT GPIOB |
| #define MCO3_PIN GPIO_PIN_13 |
| #endif /* RCC_MCO3_SUPPORT */ |
| |
| /** |
| * @} |
| */ |
| |
| /* Private variables ---------------------------------------------------------*/ |
| /* Private function prototypes -----------------------------------------------*/ |
| /* Exported functions ---------------------------------------------------------*/ |
| |
| /** @defgroup RCC_Exported_Functions RCC Exported Functions |
| * @{ |
| */ |
| |
| /** @defgroup RCC_Exported_Functions_Group1 Initialization and de-initialization functions |
| * @brief Initialization and Configuration functions |
| * |
| @verbatim |
| =============================================================================== |
| ##### Initialization and de-initialization functions ##### |
| =============================================================================== |
| [..] |
| This section provides functions allowing to configure the internal/external oscillators |
| (MSI, HSE, HSI, LSE, LSI, PLL, CSS and MCO) and the System buses clocks (SYSCLK, AHB, APB1 |
| and APB2). |
| |
| [..] Internal/external clock and PLL configuration |
| (#) MSI (Multispeed internal), Seven frequency ranges are available: 65.536 kHz, |
| 131.072 kHz, 262.144 kHz, 524.288 kHz, 1.048 MHz, 2.097 MHz (default value) and 4.194 MHz. |
| |
| (#) HSI (high-speed internal), 16 MHz factory-trimmed RC used directly or through |
| the PLL as System clock source. |
| (#) LSI (low-speed internal), ~37 KHz low consumption RC used as IWDG and/or RTC |
| clock source. |
| |
| (#) HSE (high-speed external), 1 to 24 MHz crystal oscillator used directly or |
| through the PLL as System clock source. Can be used also as RTC clock source. |
| |
| (#) LSE (low-speed external), 32 KHz oscillator used as RTC clock source. |
| |
| (#) PLL (clocked by HSI or HSE), featuring different output clocks: |
| (++) The first output is used to generate the high speed system clock (up to 32 MHz) |
| (++) The second output is used to generate the clock for the USB OTG FS (48 MHz) |
| |
| (#) CSS (Clock security system), once enable using the macro __HAL_RCC_CSS_ENABLE() |
| and if a HSE clock failure occurs(HSE used directly or through PLL as System |
| clock source), the System clocks automatically switched to MSI and an interrupt |
| is generated if enabled. The interrupt is linked to the Cortex-M0+ NMI |
| (Non-Maskable Interrupt) exception vector. |
| |
| (#) MCO1/MCO2/MCO3 (microcontroller clock output), used to output SYSCLK, HSI, LSI, MSI, LSE, |
| HSE, HSI48 or PLL clock (through a configurable prescaler) on PA8/PA9/PB13 pins. |
| |
| [..] System, AHB and APB buses clocks configuration |
| (#) Several clock sources can be used to drive the System clock (SYSCLK): MSI, HSI, |
| HSE and PLL. |
| The AHB clock (HCLK) is derived from System clock through configurable |
| prescaler and used to clock the CPU, memory and peripherals mapped |
| on AHB bus (DMA, GPIO...). APB1 (PCLK1) and APB2 (PCLK2) clocks are derived |
| from AHB clock through configurable prescalers and used to clock |
| the peripherals mapped on these buses. You can use |
| "HAL_RCC_GetSysClockFreq()" function to retrieve the frequencies of these clocks. |
| |
| -@- All the peripheral clocks are derived from the System clock (SYSCLK) except: |
| (+@) RTC: RTC clock can be derived either from the LSI, LSE or HSE clock |
| divided by 2 to 16. You have to use __HAL_RCC_RTC_CONFIG() and __HAL_RCC_RTC_ENABLE() |
| macros to configure this clock. |
| (+@) LCD: LCD clock can be derived either from the LSI, LSE or HSE clock |
| divided by 2 to 16. You have to use __HAL_RCC_LCD_CONFIG() |
| macros to configure this clock. |
| (+@) USB FS and RNG: USB FS require a frequency equal to 48 MHz to work correctly. |
| This clock is derived of the main PLL through PLL Multiplier or HSI48 RC oscillator. |
| |
| (+@) IWDG clock which is always the LSI clock. |
| |
| (#) The maximum frequency of the SYSCLK and HCLK is 32 MHz, PCLK2 32 MHz |
| and PCLK1 32 MHz. Depending on the device voltage range, the maximum |
| frequency should be adapted accordingly. |
| @endverbatim |
| * @{ |
| */ |
| |
| /* |
| Additional consideration on the HCLK based on Latency settings: |
| +----------------------------------------------------------------------+ |
| | Latency | HCLK clock frequency (MHz) | |
| | |------------------------------------------------------| |
| | | voltage range 1 | voltage range 2 | voltage range 3 | |
| | | 1.8 V | 1.5 V | 1.2 V | |
| |---------------|------------------|-----------------|-----------------| |
| |0WS(1CPU cycle)| 0 < HCLK <= 16 | 0 < HCLK <= 8 | 0 < HCLK <= 4.2 | |
| |---------------|------------------|-----------------|-----------------| |
| |1WS(2CPU cycle)| 16 < HCLK <= 32 | 8 < HCLK <= 16 | | |
| +----------------------------------------------------------------------+ |
| |
| The following table gives the different clock source frequencies depending on the product |
| voltage range: |
| +------------------------------------------------------------------------------------------+ |
| | Product voltage | Clock frequency | |
| | |------------------|-----------------------------|-----------------------| |
| | range | MSI | HSI | HSE | PLL | |
| |-----------------|---------|--------|-----------------------------|-----------------------| |
| | Range 1 (1.8 V) | 4.2 MHz | 16 MHz | HSE 32 MHz (external clock) | 32 MHz | |
| | | | | or 24 MHz (crystal) | (PLLVCO max = 96 MHz) | |
| |-----------------|---------|--------|-----------------------------|-----------------------| |
| | Range 2 (1.5 V) | 4.2 MHz | 16 MHz | 16 MHz | 16 MHz | |
| | | | | | (PLLVCO max = 48 MHz) | |
| |-----------------|---------|--------|-----------------------------|-----------------------| |
| | Range 3 (1.2 V) | 4.2 MHz | NA | 8 MHz | 4 MHz | |
| | | | | | (PLLVCO max = 24 MHz) | |
| +------------------------------------------------------------------------------------------+ |
| */ |
| |
| /** |
| * @brief Resets the RCC clock configuration to the default reset state. |
| * @note The default reset state of the clock configuration is given below: |
| * - MSI ON and used as system clock source |
| * - HSI, HSE and PLL OFF |
| * - AHB, APB1 and APB2 prescaler set to 1. |
| * - CSS and MCO1/MCO2/MCO3 OFF |
| * - All interrupts disabled |
| * @note This function does not modify the configuration of the |
| * - Peripheral clocks |
| * - LSI, LSE and RTC clocks |
| * - HSI48 clock |
| * @retval None |
| */ |
| HAL_StatusTypeDef HAL_RCC_DeInit(void) |
| { |
| __IO uint32_t tmpreg; |
| uint32_t tickstart; |
| uint32_t vl_mask; |
| HAL_StatusTypeDef status; |
| |
| /* Set MSIClockRange, HSITRIM and MSITRIM bits to the reset values */ |
| MODIFY_REG(RCC->ICSCR, (RCC_ICSCR_MSITRIM | RCC_ICSCR_HSITRIM | RCC_ICSCR_MSIRANGE), \ |
| ((RCC_MSICALIBRATION_DEFAULT << RCC_ICSCR_MSITRIM_Pos) | (RCC_HSICALIBRATION_DEFAULT << RCC_ICSCR_HSITRIM_Pos) | RCC_ICSCR_MSIRANGE_5)); |
| |
| /* Set MSION bit */ |
| SET_BIT(RCC->CR, RCC_CR_MSION); |
| |
| /* Get Start Tick*/ |
| tickstart = HAL_GetTick(); |
| |
| /* Wait till MSI is ready */ |
| while (READ_BIT(RCC->CR, RCC_CR_MSIRDY) == 0U) |
| { |
| if ((HAL_GetTick() - tickstart) > MSI_TIMEOUT_VALUE) |
| { |
| return HAL_TIMEOUT; |
| } |
| } |
| |
| /* Switch SYSCLK to MSI*/ |
| CLEAR_BIT(RCC->CFGR, RCC_CFGR_SW); |
| |
| /* Wait till MSI as SYSCLK status is ready */ |
| while (READ_BIT(RCC->CFGR, RCC_CFGR_SWS) != 0U) |
| { |
| if ((HAL_GetTick() - tickstart) > CLOCKSWITCH_TIMEOUT_VALUE) |
| { |
| return HAL_TIMEOUT; |
| } |
| } |
| |
| /* Update the SystemCoreClock global variable for MSI as system clock source */ |
| SystemCoreClock = MSI_VALUE; |
| |
| /* Configure the source of time base considering new system clock settings */ |
| status = HAL_InitTick(uwTickPrio); |
| if(status != HAL_OK) |
| { |
| return status; |
| } |
| |
| /* Reset HSE, HSI, CSS, PLL */ |
| #if defined(RCC_CR_CSSHSEON) && defined(RCC_CR_HSIOUTEN) |
| CLEAR_BIT(RCC->CR, RCC_CR_HSION| RCC_CR_HSIKERON| RCC_CR_HSIDIVEN | RCC_CR_HSIOUTEN | \ |
| RCC_CR_HSEON | RCC_CR_CSSHSEON | RCC_CR_PLLON); |
| #elif !defined(RCC_CR_CSSHSEON) && defined(RCC_CR_HSIOUTEN) |
| CLEAR_BIT(RCC->CR, RCC_CR_HSION| RCC_CR_HSIKERON| RCC_CR_HSIDIVEN | RCC_CR_HSIOUTEN | \ |
| RCC_CR_HSEON | RCC_CR_PLLON); |
| #elif defined(RCC_CR_CSSHSEON) && !defined(RCC_CR_HSIOUTEN) |
| CLEAR_BIT(RCC->CR, RCC_CR_HSION| RCC_CR_HSIKERON| RCC_CR_HSIDIVEN | \ |
| RCC_CR_HSEON | RCC_CR_CSSHSEON | RCC_CR_PLLON); |
| #endif |
| |
| /* Delay after an RCC peripheral clock */ \ |
| tmpreg = READ_BIT(RCC->CR, RCC_CR_HSEON); \ |
| UNUSED(tmpreg); |
| |
| /* Reset HSEBYP bit */ |
| CLEAR_BIT(RCC->CR, RCC_CR_HSEBYP); |
| |
| /* Get Start Tick*/ |
| tickstart = HAL_GetTick(); |
| |
| /* Wait till PLL is not ready */ |
| while (READ_BIT(RCC->CR, RCC_CR_PLLRDY) != 0U) |
| { |
| if ((HAL_GetTick() - tickstart) > PLL_TIMEOUT_VALUE) |
| { |
| return HAL_TIMEOUT; |
| } |
| } |
| |
| /* Reset CFGR register */ |
| CLEAR_REG(RCC->CFGR); |
| |
| /* Disable all interrupts */ |
| CLEAR_REG(RCC->CIER); |
| |
| /* Clear all flags */ |
| vl_mask = RCC_CICR_LSIRDYC | RCC_CICR_LSERDYC | RCC_CICR_HSIRDYC | RCC_CICR_HSERDYC | RCC_CICR_PLLRDYC | RCC_CICR_MSIRDYC | RCC_CICR_CSSLSEC; |
| #if defined(RCC_HSI48_SUPPORT) |
| vl_mask |= RCC_CICR_HSI48RDYC; |
| #endif |
| #if defined(RCC_HSECSS_SUPPORT) |
| vl_mask |= RCC_CICR_CSSHSEC; |
| #endif |
| WRITE_REG(RCC->CICR, vl_mask); |
| |
| /* Clear all reset flags */ |
| SET_BIT(RCC->CSR, RCC_CSR_RMVF); |
| |
| return HAL_OK; |
| } |
| |
| /** |
| * @brief Initializes the RCC Oscillators according to the specified parameters in the |
| * RCC_OscInitTypeDef. |
| * @param RCC_OscInitStruct pointer to an RCC_OscInitTypeDef structure that |
| * contains the configuration information for the RCC Oscillators. |
| * @note The PLL is not disabled when used as system clock. |
| * @note Transitions LSE Bypass to LSE On and LSE On to LSE Bypass are not |
| * supported by this macro. User should request a transition to LSE Off |
| * first and then LSE On or LSE Bypass. |
| * @note Transition HSE Bypass to HSE On and HSE On to HSE Bypass are not |
| * supported by this macro. User should request a transition to HSE Off |
| * first and then HSE On or HSE Bypass. |
| * @retval HAL status |
| */ |
| HAL_StatusTypeDef HAL_RCC_OscConfig(RCC_OscInitTypeDef *RCC_OscInitStruct) |
| { |
| uint32_t tickstart; |
| uint32_t hsi_state; |
| HAL_StatusTypeDef status; |
| uint32_t sysclk_source, pll_config; |
| |
| /* Check Null pointer */ |
| if(RCC_OscInitStruct == NULL) |
| { |
| return HAL_ERROR; |
| } |
| |
| /* Check the parameters */ |
| assert_param(IS_RCC_OSCILLATORTYPE(RCC_OscInitStruct->OscillatorType)); |
| |
| sysclk_source = __HAL_RCC_GET_SYSCLK_SOURCE(); |
| pll_config = __HAL_RCC_GET_PLL_OSCSOURCE(); |
| |
| /*------------------------------- HSE Configuration ------------------------*/ |
| if(((RCC_OscInitStruct->OscillatorType) & RCC_OSCILLATORTYPE_HSE) == RCC_OSCILLATORTYPE_HSE) |
| { |
| /* Check the parameters */ |
| assert_param(IS_RCC_HSE(RCC_OscInitStruct->HSEState)); |
| |
| /* When the HSE is used as system clock or clock source for PLL in these cases it is not allowed to be disabled */ |
| if((sysclk_source == RCC_SYSCLKSOURCE_STATUS_HSE) |
| || ((sysclk_source == RCC_SYSCLKSOURCE_STATUS_PLLCLK) && (pll_config == RCC_PLLSOURCE_HSE))) |
| { |
| if((__HAL_RCC_GET_FLAG(RCC_FLAG_HSERDY) != 0U) && (RCC_OscInitStruct->HSEState == RCC_HSE_OFF)) |
| { |
| return HAL_ERROR; |
| } |
| } |
| else |
| { |
| /* Set the new HSE configuration ---------------------------------------*/ |
| __HAL_RCC_HSE_CONFIG(RCC_OscInitStruct->HSEState); |
| |
| /* Check the HSE State */ |
| if(RCC_OscInitStruct->HSEState != RCC_HSE_OFF) |
| { |
| /* Get Start Tick */ |
| tickstart = HAL_GetTick(); |
| |
| /* Wait till HSE is ready */ |
| while(__HAL_RCC_GET_FLAG(RCC_FLAG_HSERDY) == 0U) |
| { |
| if((HAL_GetTick() - tickstart ) > HSE_TIMEOUT_VALUE) |
| { |
| return HAL_TIMEOUT; |
| } |
| } |
| } |
| else |
| { |
| /* Get Start Tick */ |
| tickstart = HAL_GetTick(); |
| |
| /* Wait till HSE is disabled */ |
| while(__HAL_RCC_GET_FLAG(RCC_FLAG_HSERDY) != 0U) |
| { |
| if((HAL_GetTick() - tickstart ) > HSE_TIMEOUT_VALUE) |
| { |
| return HAL_TIMEOUT; |
| } |
| } |
| } |
| } |
| } |
| /*----------------------------- HSI Configuration --------------------------*/ |
| if(((RCC_OscInitStruct->OscillatorType) & RCC_OSCILLATORTYPE_HSI) == RCC_OSCILLATORTYPE_HSI) |
| { |
| /* Check the parameters */ |
| assert_param(IS_RCC_HSI(RCC_OscInitStruct->HSIState)); |
| assert_param(IS_RCC_CALIBRATION_VALUE(RCC_OscInitStruct->HSICalibrationValue)); |
| |
| hsi_state = RCC_OscInitStruct->HSIState; |
| |
| #if defined(RCC_CR_HSIOUTEN) |
| if((hsi_state & RCC_HSI_OUTEN) != 0U) |
| { |
| /* HSI Output enable for timer requested */ |
| SET_BIT(RCC->CR, RCC_CR_HSIOUTEN); |
| |
| hsi_state &= ~RCC_CR_HSIOUTEN; |
| } |
| #endif |
| |
| /* Check if HSI is used as system clock or as PLL source when PLL is selected as system clock */ |
| if((sysclk_source == RCC_SYSCLKSOURCE_STATUS_HSI) |
| || ((sysclk_source == RCC_SYSCLKSOURCE_STATUS_PLLCLK) && (pll_config == RCC_PLLSOURCE_HSI))) |
| { |
| /* When HSI is used as system clock it will not disabled */ |
| if((__HAL_RCC_GET_FLAG(RCC_FLAG_HSIRDY) != 0U) && (hsi_state == RCC_HSI_OFF)) |
| { |
| return HAL_ERROR; |
| } |
| /* Otherwise, just the calibration and HSI or HSIdiv4 are allowed */ |
| else |
| { |
| /* Adjusts the Internal High Speed oscillator (HSI) calibration value.*/ |
| __HAL_RCC_HSI_CALIBRATIONVALUE_ADJUST(RCC_OscInitStruct->HSICalibrationValue); |
| |
| /* Enable the Internal High Speed oscillator (HSI or HSIdiv4) */ |
| __HAL_RCC_HSI_CONFIG(hsi_state); |
| } |
| |
| /* Update the SystemCoreClock global variable */ |
| SystemCoreClock = HAL_RCC_GetSysClockFreq() >> AHBPrescTable[(RCC->CFGR & RCC_CFGR_HPRE)>> RCC_CFGR_HPRE_Pos]; |
| |
| /* Configure the source of time base considering new system clocks settings*/ |
| status = HAL_InitTick (uwTickPrio); |
| if(status != HAL_OK) |
| { |
| return status; |
| } |
| } |
| else |
| { |
| /* Check the HSI State */ |
| if(hsi_state != RCC_HSI_OFF) |
| { |
| /* Enable the Internal High Speed oscillator (HSI or HSIdiv4) */ |
| __HAL_RCC_HSI_CONFIG(hsi_state); |
| |
| /* Get Start Tick */ |
| tickstart = HAL_GetTick(); |
| |
| /* Wait till HSI is ready */ |
| while(__HAL_RCC_GET_FLAG(RCC_FLAG_HSIRDY) == 0U) |
| { |
| if((HAL_GetTick() - tickstart ) > HSI_TIMEOUT_VALUE) |
| { |
| return HAL_TIMEOUT; |
| } |
| } |
| |
| /* Adjusts the Internal High Speed oscillator (HSI) calibration value.*/ |
| __HAL_RCC_HSI_CALIBRATIONVALUE_ADJUST(RCC_OscInitStruct->HSICalibrationValue); |
| } |
| else |
| { |
| /* Disable the Internal High Speed oscillator (HSI). */ |
| __HAL_RCC_HSI_DISABLE(); |
| |
| /* Get Start Tick */ |
| tickstart = HAL_GetTick(); |
| |
| /* Wait till HSI is disabled */ |
| while(__HAL_RCC_GET_FLAG(RCC_FLAG_HSIRDY) != 0U) |
| { |
| if((HAL_GetTick() - tickstart ) > HSI_TIMEOUT_VALUE) |
| { |
| return HAL_TIMEOUT; |
| } |
| } |
| } |
| } |
| } |
| /*----------------------------- MSI Configuration --------------------------*/ |
| if(((RCC_OscInitStruct->OscillatorType) & RCC_OSCILLATORTYPE_MSI) == RCC_OSCILLATORTYPE_MSI) |
| { |
| /* When the MSI is used as system clock it will not be disabled */ |
| if(sysclk_source == RCC_CFGR_SWS_MSI) |
| { |
| if((__HAL_RCC_GET_FLAG(RCC_FLAG_MSIRDY) != 0U) && (RCC_OscInitStruct->MSIState == RCC_MSI_OFF)) |
| { |
| return HAL_ERROR; |
| } |
| /* Otherwise, just the calibration and MSI range change are allowed */ |
| else |
| { |
| /* Check MSICalibrationValue and MSIClockRange input parameters */ |
| assert_param(IS_RCC_MSICALIBRATION_VALUE(RCC_OscInitStruct->MSICalibrationValue)); |
| assert_param(IS_RCC_MSI_CLOCK_RANGE(RCC_OscInitStruct->MSIClockRange)); |
| |
| /* Selects the Multiple Speed oscillator (MSI) clock range .*/ |
| __HAL_RCC_MSI_RANGE_CONFIG(RCC_OscInitStruct->MSIClockRange); |
| /* Adjusts the Multiple Speed oscillator (MSI) calibration value.*/ |
| __HAL_RCC_MSI_CALIBRATIONVALUE_ADJUST(RCC_OscInitStruct->MSICalibrationValue); |
| |
| |
| /* Update the SystemCoreClock global variable */ |
| SystemCoreClock = (32768U * (1UL << ((RCC_OscInitStruct->MSIClockRange >> RCC_ICSCR_MSIRANGE_Pos) + 1U))) |
| >> AHBPrescTable[((RCC->CFGR & RCC_CFGR_HPRE) >> RCC_CFGR_HPRE_Pos)]; |
| |
| /* Configure the source of time base considering new system clocks settings*/ |
| status = HAL_InitTick (uwTickPrio); |
| if(status != HAL_OK) |
| { |
| return status; |
| } |
| } |
| } |
| else |
| { |
| /* Check MSI State */ |
| assert_param(IS_RCC_MSI(RCC_OscInitStruct->MSIState)); |
| |
| /* Check the MSI State */ |
| if(RCC_OscInitStruct->MSIState != RCC_MSI_OFF) |
| { |
| /* Enable the Multi Speed oscillator (MSI). */ |
| __HAL_RCC_MSI_ENABLE(); |
| |
| /* Get Start Tick */ |
| tickstart = HAL_GetTick(); |
| |
| /* Wait till MSI is ready */ |
| while(__HAL_RCC_GET_FLAG(RCC_FLAG_MSIRDY) == 0U) |
| { |
| if((HAL_GetTick() - tickstart) > MSI_TIMEOUT_VALUE) |
| { |
| return HAL_TIMEOUT; |
| } |
| } |
| /* Check MSICalibrationValue and MSIClockRange input parameters */ |
| assert_param(IS_RCC_MSICALIBRATION_VALUE(RCC_OscInitStruct->MSICalibrationValue)); |
| assert_param(IS_RCC_MSI_CLOCK_RANGE(RCC_OscInitStruct->MSIClockRange)); |
| |
| /* Selects the Multiple Speed oscillator (MSI) clock range .*/ |
| __HAL_RCC_MSI_RANGE_CONFIG(RCC_OscInitStruct->MSIClockRange); |
| /* Adjusts the Multiple Speed oscillator (MSI) calibration value.*/ |
| __HAL_RCC_MSI_CALIBRATIONVALUE_ADJUST(RCC_OscInitStruct->MSICalibrationValue); |
| } |
| else |
| { |
| /* Disable the Multi Speed oscillator (MSI). */ |
| __HAL_RCC_MSI_DISABLE(); |
| |
| /* Get Start Tick */ |
| tickstart = HAL_GetTick(); |
| |
| /* Wait till MSI is ready */ |
| while(__HAL_RCC_GET_FLAG(RCC_FLAG_MSIRDY) != 0U) |
| { |
| if((HAL_GetTick() - tickstart) > MSI_TIMEOUT_VALUE) |
| { |
| return HAL_TIMEOUT; |
| } |
| } |
| } |
| } |
| } |
| /*------------------------------ LSI Configuration -------------------------*/ |
| if(((RCC_OscInitStruct->OscillatorType) & RCC_OSCILLATORTYPE_LSI) == RCC_OSCILLATORTYPE_LSI) |
| { |
| /* Check the parameters */ |
| assert_param(IS_RCC_LSI(RCC_OscInitStruct->LSIState)); |
| |
| /* Check the LSI State */ |
| if(RCC_OscInitStruct->LSIState != RCC_LSI_OFF) |
| { |
| /* Enable the Internal Low Speed oscillator (LSI). */ |
| __HAL_RCC_LSI_ENABLE(); |
| |
| /* Get Start Tick */ |
| tickstart = HAL_GetTick(); |
| |
| /* Wait till LSI is ready */ |
| while(__HAL_RCC_GET_FLAG(RCC_FLAG_LSIRDY) == 0U) |
| { |
| if((HAL_GetTick() - tickstart ) > LSI_TIMEOUT_VALUE) |
| { |
| return HAL_TIMEOUT; |
| } |
| } |
| } |
| else |
| { |
| /* Disable the Internal Low Speed oscillator (LSI). */ |
| __HAL_RCC_LSI_DISABLE(); |
| |
| /* Get Start Tick */ |
| tickstart = HAL_GetTick(); |
| |
| /* Wait till LSI is disabled */ |
| while(__HAL_RCC_GET_FLAG(RCC_FLAG_LSIRDY) != 0U) |
| { |
| if((HAL_GetTick() - tickstart ) > LSI_TIMEOUT_VALUE) |
| { |
| return HAL_TIMEOUT; |
| } |
| } |
| } |
| } |
| /*------------------------------ LSE Configuration -------------------------*/ |
| if(((RCC_OscInitStruct->OscillatorType) & RCC_OSCILLATORTYPE_LSE) == RCC_OSCILLATORTYPE_LSE) |
| { |
| FlagStatus pwrclkchanged = RESET; |
| |
| /* Check the parameters */ |
| assert_param(IS_RCC_LSE(RCC_OscInitStruct->LSEState)); |
| |
| /* Update LSE configuration in Backup Domain control register */ |
| /* Requires to enable write access to Backup Domain of necessary */ |
| if(__HAL_RCC_PWR_IS_CLK_DISABLED()) |
| { |
| __HAL_RCC_PWR_CLK_ENABLE(); |
| pwrclkchanged = SET; |
| } |
| |
| if(HAL_IS_BIT_CLR(PWR->CR, PWR_CR_DBP)) |
| { |
| /* Enable write access to Backup domain */ |
| SET_BIT(PWR->CR, PWR_CR_DBP); |
| |
| /* Wait for Backup domain Write protection disable */ |
| tickstart = HAL_GetTick(); |
| |
| while(HAL_IS_BIT_CLR(PWR->CR, PWR_CR_DBP)) |
| { |
| if((HAL_GetTick() - tickstart) > RCC_DBP_TIMEOUT_VALUE) |
| { |
| return HAL_TIMEOUT; |
| } |
| } |
| } |
| |
| /* Set the new LSE configuration -----------------------------------------*/ |
| __HAL_RCC_LSE_CONFIG(RCC_OscInitStruct->LSEState); |
| |
| /* Check the LSE State */ |
| if(RCC_OscInitStruct->LSEState != RCC_LSE_OFF) |
| { |
| /* Get Start Tick */ |
| tickstart = HAL_GetTick(); |
| |
| /* Wait till LSE is ready */ |
| while(__HAL_RCC_GET_FLAG(RCC_FLAG_LSERDY) == 0U) |
| { |
| if((HAL_GetTick() - tickstart ) > RCC_LSE_TIMEOUT_VALUE) |
| { |
| return HAL_TIMEOUT; |
| } |
| } |
| } |
| else |
| { |
| /* Get Start Tick */ |
| tickstart = HAL_GetTick(); |
| |
| /* Wait till LSE is disabled */ |
| while(__HAL_RCC_GET_FLAG(RCC_FLAG_LSERDY) != 0U) |
| { |
| if((HAL_GetTick() - tickstart ) > RCC_LSE_TIMEOUT_VALUE) |
| { |
| return HAL_TIMEOUT; |
| } |
| } |
| } |
| |
| /* Require to disable power clock if necessary */ |
| if(pwrclkchanged == SET) |
| { |
| __HAL_RCC_PWR_CLK_DISABLE(); |
| } |
| } |
| |
| #if defined(RCC_HSI48_SUPPORT) |
| /*----------------------------- HSI48 Configuration --------------------------*/ |
| if(((RCC_OscInitStruct->OscillatorType) & RCC_OSCILLATORTYPE_HSI48) == RCC_OSCILLATORTYPE_HSI48) |
| { |
| /* Check the parameters */ |
| assert_param(IS_RCC_HSI48(RCC_OscInitStruct->HSI48State)); |
| |
| /* Check the HSI48 State */ |
| if(RCC_OscInitStruct->HSI48State != RCC_HSI48_OFF) |
| { |
| /* Enable the Internal High Speed oscillator (HSI48). */ |
| __HAL_RCC_HSI48_ENABLE(); |
| |
| /* Get Start Tick */ |
| tickstart = HAL_GetTick(); |
| |
| /* Wait till HSI48 is ready */ |
| while(__HAL_RCC_GET_FLAG(RCC_FLAG_HSI48RDY) == 0U) |
| { |
| if((HAL_GetTick() - tickstart) > HSI48_TIMEOUT_VALUE) |
| { |
| return HAL_TIMEOUT; |
| } |
| } |
| } |
| else |
| { |
| /* Disable the Internal High Speed oscillator (HSI48). */ |
| __HAL_RCC_HSI48_DISABLE(); |
| |
| /* Get Start Tick */ |
| tickstart = HAL_GetTick(); |
| |
| /* Wait till HSI48 is ready */ |
| while(__HAL_RCC_GET_FLAG(RCC_FLAG_HSI48RDY) != 0U) |
| { |
| if((HAL_GetTick() - tickstart) > HSI48_TIMEOUT_VALUE) |
| { |
| return HAL_TIMEOUT; |
| } |
| } |
| } |
| } |
| #endif /* RCC_HSI48_SUPPORT */ |
| |
| /*-------------------------------- PLL Configuration -----------------------*/ |
| /* Check the parameters */ |
| assert_param(IS_RCC_PLL(RCC_OscInitStruct->PLL.PLLState)); |
| if ((RCC_OscInitStruct->PLL.PLLState) != RCC_PLL_NONE) |
| { |
| /* Check if the PLL is used as system clock or not */ |
| if(sysclk_source != RCC_SYSCLKSOURCE_STATUS_PLLCLK) |
| { |
| if((RCC_OscInitStruct->PLL.PLLState) == RCC_PLL_ON) |
| { |
| /* Check the parameters */ |
| assert_param(IS_RCC_PLLSOURCE(RCC_OscInitStruct->PLL.PLLSource)); |
| assert_param(IS_RCC_PLL_MUL(RCC_OscInitStruct->PLL.PLLMUL)); |
| assert_param(IS_RCC_PLL_DIV(RCC_OscInitStruct->PLL.PLLDIV)); |
| |
| /* Disable the main PLL. */ |
| __HAL_RCC_PLL_DISABLE(); |
| |
| /* Get Start Tick */ |
| tickstart = HAL_GetTick(); |
| |
| /* Wait till PLL is ready */ |
| while(__HAL_RCC_GET_FLAG(RCC_FLAG_PLLRDY) != 0U) |
| { |
| if((HAL_GetTick() - tickstart ) > PLL_TIMEOUT_VALUE) |
| { |
| return HAL_TIMEOUT; |
| } |
| } |
| |
| /* Configure the main PLL clock source, multiplication and division factors. */ |
| __HAL_RCC_PLL_CONFIG(RCC_OscInitStruct->PLL.PLLSource, |
| RCC_OscInitStruct->PLL.PLLMUL, |
| RCC_OscInitStruct->PLL.PLLDIV); |
| /* Enable the main PLL. */ |
| __HAL_RCC_PLL_ENABLE(); |
| |
| /* Get Start Tick */ |
| tickstart = HAL_GetTick(); |
| |
| /* Wait till PLL is ready */ |
| while(__HAL_RCC_GET_FLAG(RCC_FLAG_PLLRDY) == 0U) |
| { |
| if((HAL_GetTick() - tickstart ) > PLL_TIMEOUT_VALUE) |
| { |
| return HAL_TIMEOUT; |
| } |
| } |
| } |
| else |
| { |
| /* Disable the main PLL. */ |
| __HAL_RCC_PLL_DISABLE(); |
| |
| /* Get Start Tick */ |
| tickstart = HAL_GetTick(); |
| |
| /* Wait till PLL is disabled */ |
| while(__HAL_RCC_GET_FLAG(RCC_FLAG_PLLRDY) != 0U) |
| { |
| if((HAL_GetTick() - tickstart ) > PLL_TIMEOUT_VALUE) |
| { |
| return HAL_TIMEOUT; |
| } |
| } |
| } |
| } |
| else |
| { |
| /* Check if there is a request to disable the PLL used as System clock source */ |
| if((RCC_OscInitStruct->PLL.PLLState) == RCC_PLL_OFF) |
| { |
| return HAL_ERROR; |
| } |
| else |
| { |
| /* Do not return HAL_ERROR if request repeats the current configuration */ |
| pll_config = RCC->CFGR; |
| if((READ_BIT(pll_config, RCC_CFGR_PLLSRC) != RCC_OscInitStruct->PLL.PLLSource) || |
| (READ_BIT(pll_config, RCC_CFGR_PLLMUL) != RCC_OscInitStruct->PLL.PLLMUL) || |
| (READ_BIT(pll_config, RCC_CFGR_PLLDIV) != RCC_OscInitStruct->PLL.PLLDIV)) |
| { |
| return HAL_ERROR; |
| } |
| } |
| } |
| } |
| return HAL_OK; |
| } |
| |
| /** |
| * @brief Initializes the CPU, AHB and APB buses clocks according to the specified |
| * parameters in the RCC_ClkInitStruct. |
| * @param RCC_ClkInitStruct pointer to an RCC_OscInitTypeDef structure that |
| * contains the configuration information for the RCC peripheral. |
| * @param FLatency FLASH Latency |
| * The value of this parameter depend on device used within the same series |
| * @note The SystemCoreClock CMSIS variable is used to store System Clock Frequency |
| * and updated by @ref HAL_RCC_GetHCLKFreq() function called within this function |
| * |
| * @note The MSI is used (enabled by hardware) as system clock source after |
| * start-up from Reset, wake-up from STOP and STANDBY mode, or in case |
| * of failure of the HSE used directly or indirectly as system clock |
| * (if the Clock Security System CSS is enabled). |
| * |
| * @note A switch from one clock source to another occurs only if the target |
| * clock source is ready (clock stable after start-up delay or PLL locked). |
| * If a clock source which is not yet ready is selected, the switch will |
| * occur when the clock source will be ready. |
| * You can use @ref HAL_RCC_GetClockConfig() function to know which clock is |
| * currently used as system clock source. |
| * @note Depending on the device voltage range, the software has to set correctly |
| * HPRE[3:0] bits to ensure that HCLK not exceed the maximum allowed frequency |
| * (for more details refer to section above "Initialization/de-initialization functions") |
| * @retval HAL status |
| */ |
| HAL_StatusTypeDef HAL_RCC_ClockConfig(RCC_ClkInitTypeDef *RCC_ClkInitStruct, uint32_t FLatency) |
| { |
| uint32_t tickstart; |
| HAL_StatusTypeDef status; |
| |
| /* Check Null pointer */ |
| if(RCC_ClkInitStruct == NULL) |
| { |
| return HAL_ERROR; |
| } |
| |
| /* Check the parameters */ |
| assert_param(IS_RCC_CLOCKTYPE(RCC_ClkInitStruct->ClockType)); |
| assert_param(IS_FLASH_LATENCY(FLatency)); |
| |
| /* To correctly read data from FLASH memory, the number of wait states (LATENCY) |
| must be correctly programmed according to the frequency of the CPU clock |
| (HCLK) and the supply voltage of the device. */ |
| |
| /* Increasing the number of wait states because of higher CPU frequency */ |
| if(FLatency > __HAL_FLASH_GET_LATENCY()) |
| { |
| /* Program the new number of wait states to the LATENCY bits in the FLASH_ACR register */ |
| __HAL_FLASH_SET_LATENCY(FLatency); |
| |
| /* Check that the new number of wait states is taken into account to access the Flash |
| memory by polling the FLASH_ACR register */ |
| tickstart = HAL_GetTick(); |
| |
| while (__HAL_FLASH_GET_LATENCY() != FLatency) |
| { |
| if ((HAL_GetTick() - tickstart) > CLOCKSWITCH_TIMEOUT_VALUE) |
| { |
| return HAL_TIMEOUT; |
| } |
| } |
| } |
| |
| /*-------------------------- HCLK Configuration --------------------------*/ |
| if(((RCC_ClkInitStruct->ClockType) & RCC_CLOCKTYPE_HCLK) == RCC_CLOCKTYPE_HCLK) |
| { |
| assert_param(IS_RCC_HCLK(RCC_ClkInitStruct->AHBCLKDivider)); |
| MODIFY_REG(RCC->CFGR, RCC_CFGR_HPRE, RCC_ClkInitStruct->AHBCLKDivider); |
| } |
| |
| /*------------------------- SYSCLK Configuration ---------------------------*/ |
| if(((RCC_ClkInitStruct->ClockType) & RCC_CLOCKTYPE_SYSCLK) == RCC_CLOCKTYPE_SYSCLK) |
| { |
| assert_param(IS_RCC_SYSCLKSOURCE(RCC_ClkInitStruct->SYSCLKSource)); |
| |
| /* HSE is selected as System Clock Source */ |
| if(RCC_ClkInitStruct->SYSCLKSource == RCC_SYSCLKSOURCE_HSE) |
| { |
| /* Check the HSE ready flag */ |
| if(__HAL_RCC_GET_FLAG(RCC_FLAG_HSERDY) == 0U) |
| { |
| return HAL_ERROR; |
| } |
| } |
| /* PLL is selected as System Clock Source */ |
| else if(RCC_ClkInitStruct->SYSCLKSource == RCC_SYSCLKSOURCE_PLLCLK) |
| { |
| /* Check the PLL ready flag */ |
| if(__HAL_RCC_GET_FLAG(RCC_FLAG_PLLRDY) == 0U) |
| { |
| return HAL_ERROR; |
| } |
| } |
| /* HSI is selected as System Clock Source */ |
| else if(RCC_ClkInitStruct->SYSCLKSource == RCC_SYSCLKSOURCE_HSI) |
| { |
| /* Check the HSI ready flag */ |
| if(__HAL_RCC_GET_FLAG(RCC_FLAG_HSIRDY) == 0U) |
| { |
| return HAL_ERROR; |
| } |
| } |
| /* MSI is selected as System Clock Source */ |
| else |
| { |
| /* Check the MSI ready flag */ |
| if(__HAL_RCC_GET_FLAG(RCC_FLAG_MSIRDY) == 0U) |
| { |
| return HAL_ERROR; |
| } |
| } |
| __HAL_RCC_SYSCLK_CONFIG(RCC_ClkInitStruct->SYSCLKSource); |
| |
| /* Get Start Tick */ |
| tickstart = HAL_GetTick(); |
| |
| if(RCC_ClkInitStruct->SYSCLKSource == RCC_SYSCLKSOURCE_HSE) |
| { |
| while (__HAL_RCC_GET_SYSCLK_SOURCE() != RCC_SYSCLKSOURCE_STATUS_HSE) |
| { |
| if((HAL_GetTick() - tickstart ) > CLOCKSWITCH_TIMEOUT_VALUE) |
| { |
| return HAL_TIMEOUT; |
| } |
| } |
| } |
| else if(RCC_ClkInitStruct->SYSCLKSource == RCC_SYSCLKSOURCE_PLLCLK) |
| { |
| while (__HAL_RCC_GET_SYSCLK_SOURCE() != RCC_SYSCLKSOURCE_STATUS_PLLCLK) |
| { |
| if((HAL_GetTick() - tickstart ) > CLOCKSWITCH_TIMEOUT_VALUE) |
| { |
| return HAL_TIMEOUT; |
| } |
| } |
| } |
| else if(RCC_ClkInitStruct->SYSCLKSource == RCC_SYSCLKSOURCE_HSI) |
| { |
| while (__HAL_RCC_GET_SYSCLK_SOURCE() != RCC_SYSCLKSOURCE_STATUS_HSI) |
| { |
| if((HAL_GetTick() - tickstart ) > CLOCKSWITCH_TIMEOUT_VALUE) |
| { |
| return HAL_TIMEOUT; |
| } |
| } |
| } |
| else |
| { |
| while(__HAL_RCC_GET_SYSCLK_SOURCE() != RCC_SYSCLKSOURCE_STATUS_MSI) |
| { |
| if((HAL_GetTick() - tickstart ) > CLOCKSWITCH_TIMEOUT_VALUE) |
| { |
| return HAL_TIMEOUT; |
| } |
| } |
| } |
| } |
| /* Decreasing the number of wait states because of lower CPU frequency */ |
| if(FLatency < __HAL_FLASH_GET_LATENCY()) |
| { |
| /* Program the new number of wait states to the LATENCY bits in the FLASH_ACR register */ |
| __HAL_FLASH_SET_LATENCY(FLatency); |
| |
| /* Check that the new number of wait states is taken into account to access the Flash |
| memory by polling the FLASH_ACR register */ |
| tickstart = HAL_GetTick(); |
| |
| while (__HAL_FLASH_GET_LATENCY() != FLatency) |
| { |
| if ((HAL_GetTick() - tickstart) > CLOCKSWITCH_TIMEOUT_VALUE) |
| { |
| return HAL_TIMEOUT; |
| } |
| } |
| } |
| |
| /*-------------------------- PCLK1 Configuration ---------------------------*/ |
| if(((RCC_ClkInitStruct->ClockType) & RCC_CLOCKTYPE_PCLK1) == RCC_CLOCKTYPE_PCLK1) |
| { |
| assert_param(IS_RCC_PCLK(RCC_ClkInitStruct->APB1CLKDivider)); |
| MODIFY_REG(RCC->CFGR, RCC_CFGR_PPRE1, RCC_ClkInitStruct->APB1CLKDivider); |
| } |
| |
| /*-------------------------- PCLK2 Configuration ---------------------------*/ |
| if(((RCC_ClkInitStruct->ClockType) & RCC_CLOCKTYPE_PCLK2) == RCC_CLOCKTYPE_PCLK2) |
| { |
| assert_param(IS_RCC_PCLK(RCC_ClkInitStruct->APB2CLKDivider)); |
| MODIFY_REG(RCC->CFGR, RCC_CFGR_PPRE2, ((RCC_ClkInitStruct->APB2CLKDivider) << 3)); |
| } |
| |
| /* Update the SystemCoreClock global variable */ |
| SystemCoreClock = HAL_RCC_GetSysClockFreq() >> AHBPrescTable[(RCC->CFGR & RCC_CFGR_HPRE)>> RCC_CFGR_HPRE_Pos]; |
| |
| /* Configure the source of time base considering new system clocks settings*/ |
| status = HAL_InitTick(uwTickPrio); |
| if(status != HAL_OK) |
| { |
| return status; |
| } |
| |
| return HAL_OK; |
| } |
| |
| /** |
| * @} |
| */ |
| |
| /** @defgroup RCC_Exported_Functions_Group2 Peripheral Control functions |
| * @brief RCC clocks control functions |
| * |
| @verbatim |
| =============================================================================== |
| ##### Peripheral Control functions ##### |
| =============================================================================== |
| [..] |
| This subsection provides a set of functions allowing to control the RCC Clocks |
| frequencies. |
| |
| @endverbatim |
| * @{ |
| */ |
| |
| /** |
| * @brief Selects the clock source to output on MCO pin. |
| * @note MCO pin should be configured in alternate function mode. |
| * @param RCC_MCOx specifies the output direction for the clock source. |
| * This parameter can be one of the following values: |
| * @arg @ref RCC_MCO1 Clock source to output on MCO1 pin(PA8). |
| * @arg @ref RCC_MCO2 Clock source to output on MCO2 pin(PA9). |
| @if STM32L031xx |
| * @arg @ref RCC_MCO3 Clock source to output on MCO3 pin(PB13) |
| @elseif STM32L041xx |
| * @arg @ref RCC_MCO3 Clock source to output on MCO3 pin(PB13) |
| @elseif STM32L073xx |
| * @arg @ref RCC_MCO3 Clock source to output on MCO3 pin(PB13) |
| @elseif STM32L083xx |
| * @arg @ref RCC_MCO3 Clock source to output on MCO3 pin(PB13) |
| @elseif STM32L072xx |
| * @arg @ref RCC_MCO3 Clock source to output on MCO3 pin(PB13) |
| @elseif STM32L082xx |
| * @arg @ref RCC_MCO3 Clock source to output on MCO3 pin(PB13) |
| @elseif STM32L071xx |
| * @arg @ref RCC_MCO3 Clock source to output on MCO3 pin(PB13) |
| @elseif STM32L081xx |
| * @arg @ref RCC_MCO3 Clock source to output on MCO3 pin(PB13) |
| @elseif STM32L051xx |
| * @arg @ref RCC_MCO3 Clock source to output on MCO3 pin(PB13) |
| @elseif STM32L053xx |
| * @arg @ref RCC_MCO3 Clock source to output on MCO3 pin(PB13) |
| @endif |
| * @param RCC_MCOSource specifies the clock source to output. |
| * This parameter can be one of the following values: |
| * @arg @ref RCC_MCO1SOURCE_NOCLOCK No clock selected as MCO clock |
| * @arg @ref RCC_MCO1SOURCE_SYSCLK System clock selected as MCO clock |
| * @arg @ref RCC_MCO1SOURCE_HSI HSI selected as MCO clock |
| * @arg @ref RCC_MCO1SOURCE_HSE HSE selected as MCO clock |
| * @arg @ref RCC_MCO1SOURCE_MSI MSI oscillator clock selected as MCO clock |
| * @arg @ref RCC_MCO1SOURCE_PLLCLK PLL clock selected as MCO clock |
| * @arg @ref RCC_MCO1SOURCE_LSI LSI clock selected as MCO clock |
| * @arg @ref RCC_MCO1SOURCE_LSE LSE clock selected as MCO clock |
| @if STM32L052xx |
| * @arg @ref RCC_MCO1SOURCE_HSI48 HSI48 clock selected as MCO clock |
| @elseif STM32L053xx |
| * @arg @ref RCC_MCO1SOURCE_HSI48 HSI48 clock selected as MCO clock |
| @elseif STM32L062xx |
| * @arg @ref RCC_MCO1SOURCE_HSI48 HSI48 clock selected as MCO clock |
| @elseif STM32L063xx |
| * @arg @ref RCC_MCO1SOURCE_HSI48 HSI48 clock selected as MCO clock |
| @elseif STM32L072xx |
| * @arg @ref RCC_MCO1SOURCE_HSI48 HSI48 clock selected as MCO clock |
| @elseif STM32L073xx |
| * @arg @ref RCC_MCO1SOURCE_HSI48 HSI48 clock selected as MCO clock |
| @elseif STM32L082xx |
| * @arg @ref RCC_MCO1SOURCE_HSI48 HSI48 clock selected as MCO clock |
| @elseif STM32L083xx |
| * @arg @ref RCC_MCO1SOURCE_HSI48 HSI48 clock selected as MCO clock |
| @endif |
| * @param RCC_MCODiv specifies the MCO DIV. |
| * This parameter can be one of the following values: |
| * @arg @ref RCC_MCODIV_1 no division applied to MCO clock |
| * @arg @ref RCC_MCODIV_2 division by 2 applied to MCO clock |
| * @arg @ref RCC_MCODIV_4 division by 4 applied to MCO clock |
| * @arg @ref RCC_MCODIV_8 division by 8 applied to MCO clock |
| * @arg @ref RCC_MCODIV_16 division by 16 applied to MCO clock |
| * @retval None |
| */ |
| void HAL_RCC_MCOConfig(uint32_t RCC_MCOx, uint32_t RCC_MCOSource, uint32_t RCC_MCODiv) |
| { |
| GPIO_InitTypeDef gpio = {0}; |
| |
| /* Check the parameters */ |
| assert_param(IS_RCC_MCO(RCC_MCOx)); |
| assert_param(IS_RCC_MCODIV(RCC_MCODiv)); |
| assert_param(IS_RCC_MCO1SOURCE(RCC_MCOSource)); |
| |
| /* Configure the MCO1 pin in alternate function mode */ |
| gpio.Mode = GPIO_MODE_AF_PP; |
| gpio.Speed = GPIO_SPEED_FREQ_HIGH; |
| gpio.Pull = GPIO_NOPULL; |
| if(RCC_MCOx == RCC_MCO1) |
| { |
| gpio.Pin = MCO1_PIN; |
| gpio.Alternate = GPIO_AF0_MCO; |
| |
| /* MCO1 Clock Enable */ |
| MCO1_CLK_ENABLE(); |
| HAL_GPIO_Init(MCO1_GPIO_PORT, &gpio); |
| } |
| #if defined(RCC_MCO3_SUPPORT) |
| else if (RCC_MCOx == RCC_MCO3) |
| { |
| gpio.Pin = MCO3_PIN; |
| gpio.Alternate = MCO3_GPIO_AF; |
| |
| /* MCO3 Clock Enable */ |
| MCO3_CLK_ENABLE(); |
| HAL_GPIO_Init(MCO3_GPIO_PORT, &gpio); |
| } |
| #endif /* RCC_MCO3_SUPPORT */ |
| else |
| { |
| gpio.Pin = MCO2_PIN; |
| gpio.Alternate = GPIO_AF0_MCO; |
| |
| /* MCO2 Clock Enable */ |
| MCO2_CLK_ENABLE(); |
| HAL_GPIO_Init(MCO2_GPIO_PORT, &gpio); |
| } |
| |
| /* Configure the MCO clock source */ |
| __HAL_RCC_MCO1_CONFIG(RCC_MCOSource, RCC_MCODiv); |
| } |
| |
| #if defined(RCC_HSECSS_SUPPORT) |
| /** |
| * @brief Enables the Clock Security System. |
| * @note If a failure is detected on the HSE oscillator clock, this oscillator |
| * is automatically disabled and an interrupt is generated to inform the |
| * software about the failure (Clock Security System Interrupt, CSSI), |
| * allowing the MCU to perform rescue operations. The CSSI is linked to |
| * the Cortex-M0+ NMI (Non-Maskable Interrupt) exception vector. |
| * @retval None |
| */ |
| void HAL_RCC_EnableCSS(void) |
| { |
| SET_BIT(RCC->CR, RCC_CR_CSSON) ; |
| } |
| |
| #endif /* RCC_HSECSS_SUPPORT */ |
| /** |
| * @brief Returns the SYSCLK frequency |
| * @note The system frequency computed by this function is not the real |
| * frequency in the chip. It is calculated based on the predefined |
| * constant and the selected clock source: |
| * @note If SYSCLK source is MSI, function returns a value based on MSI |
| * Value as defined by the MSI range. |
| * @note If SYSCLK source is HSI, function returns values based on HSI_VALUE(*) |
| * @note If SYSCLK source is HSE, function returns a value based on HSE_VALUE(**) |
| * @note If SYSCLK source is PLL, function returns a value based on HSE_VALUE(**) |
| * or HSI_VALUE(*) multiplied/divided by the PLL factors. |
| * @note (*) HSI_VALUE is a constant defined in stm32l0xx_hal_conf.h file (default value |
| * 16 MHz) but the real value may vary depending on the variations |
| * in voltage and temperature. |
| * @note (**) HSE_VALUE is a constant defined in stm32l0xx_hal_conf.h file (default value |
| * 8 MHz), user has to ensure that HSE_VALUE is same as the real |
| * frequency of the crystal used. Otherwise, this function may |
| * have wrong result. |
| * |
| * @note The result of this function could be not correct when using fractional |
| * value for HSE crystal. |
| * |
| * @note This function can be used by the user application to compute the |
| * baud-rate for the communication peripherals or configure other parameters. |
| * |
| * @note Each time SYSCLK changes, this function must be called to update the |
| * right SYSCLK value. Otherwise, any configuration based on this function will be incorrect. |
| * |
| * @retval SYSCLK frequency |
| */ |
| uint32_t HAL_RCC_GetSysClockFreq(void) |
| { |
| uint32_t tmpreg, pllm, plld, pllvco, msiclkrange; /* no init needed */ |
| uint32_t sysclockfreq; |
| |
| tmpreg = RCC->CFGR; |
| |
| /* Get SYSCLK source -------------------------------------------------------*/ |
| switch (tmpreg & RCC_CFGR_SWS) |
| { |
| case RCC_SYSCLKSOURCE_STATUS_HSI: /* HSI used as system clock source */ |
| { |
| if ((RCC->CR & RCC_CR_HSIDIVF) != 0U) |
| { |
| sysclockfreq = (HSI_VALUE >> 2); |
| } |
| else |
| { |
| sysclockfreq = HSI_VALUE; |
| } |
| break; |
| } |
| case RCC_SYSCLKSOURCE_STATUS_HSE: /* HSE used as system clock */ |
| { |
| sysclockfreq = HSE_VALUE; |
| break; |
| } |
| case RCC_SYSCLKSOURCE_STATUS_PLLCLK: /* PLL used as system clock */ |
| { |
| pllm = PLLMulTable[(uint32_t)(tmpreg & RCC_CFGR_PLLMUL) >> RCC_CFGR_PLLMUL_Pos]; |
| plld = ((uint32_t)(tmpreg & RCC_CFGR_PLLDIV) >> RCC_CFGR_PLLDIV_Pos) + 1U; |
| if (__HAL_RCC_GET_PLL_OSCSOURCE() != RCC_PLLSOURCE_HSI) |
| { |
| /* HSE used as PLL clock source */ |
| pllvco = (uint32_t)((HSE_VALUE * pllm) / plld); |
| } |
| else |
| { |
| if ((RCC->CR & RCC_CR_HSIDIVF) != 0U) |
| { |
| pllvco = (uint32_t)((((HSI_VALUE >> 2)) * pllm) / plld); |
| } |
| else |
| { |
| pllvco = (uint32_t)((HSI_VALUE * pllm) / plld); |
| } |
| } |
| sysclockfreq = pllvco; |
| break; |
| } |
| case RCC_SYSCLKSOURCE_STATUS_MSI: /* MSI used as system clock source */ |
| default: /* MSI used as system clock */ |
| { |
| msiclkrange = (RCC->ICSCR & RCC_ICSCR_MSIRANGE ) >> RCC_ICSCR_MSIRANGE_Pos; |
| sysclockfreq = (32768U * (1UL << (msiclkrange + 1U))); |
| break; |
| } |
| } |
| return sysclockfreq; |
| } |
| |
| /** |
| * @brief Returns the HCLK frequency |
| * @note Each time HCLK changes, this function must be called to update the |
| * right HCLK value. Otherwise, any configuration based on this function will be incorrect. |
| * |
| * @note The SystemCoreClock CMSIS variable is used to store System Clock Frequency |
| * and updated within this function |
| * @retval HCLK frequency |
| */ |
| uint32_t HAL_RCC_GetHCLKFreq(void) |
| { |
| return SystemCoreClock; |
| } |
| |
| /** |
| * @brief Returns the PCLK1 frequency |
| * @note Each time PCLK1 changes, this function must be called to update the |
| * right PCLK1 value. Otherwise, any configuration based on this function will be incorrect. |
| * @retval PCLK1 frequency |
| */ |
| uint32_t HAL_RCC_GetPCLK1Freq(void) |
| { |
| /* Get HCLK source and Compute PCLK1 frequency ---------------------------*/ |
| return (HAL_RCC_GetHCLKFreq() >> APBPrescTable[(RCC->CFGR & RCC_CFGR_PPRE1) >> RCC_CFGR_PPRE1_Pos]); |
| } |
| |
| /** |
| * @brief Returns the PCLK2 frequency |
| * @note Each time PCLK2 changes, this function must be called to update the |
| * right PCLK2 value. Otherwise, any configuration based on this function will be incorrect. |
| * @retval PCLK2 frequency |
| */ |
| uint32_t HAL_RCC_GetPCLK2Freq(void) |
| { |
| /* Get HCLK source and Compute PCLK2 frequency ---------------------------*/ |
| return (HAL_RCC_GetHCLKFreq()>> APBPrescTable[(RCC->CFGR & RCC_CFGR_PPRE2) >> RCC_CFGR_PPRE2_Pos]); |
| } |
| |
| /** |
| * @brief Configures the RCC_OscInitStruct according to the internal |
| * RCC configuration registers. |
| * @param RCC_OscInitStruct pointer to an RCC_OscInitTypeDef structure that |
| * will be configured. |
| * @retval None |
| */ |
| void HAL_RCC_GetOscConfig(RCC_OscInitTypeDef *RCC_OscInitStruct) |
| { |
| /* Check the parameters */ |
| assert_param(RCC_OscInitStruct != (void *)NULL); |
| |
| /* Set all possible values for the Oscillator type parameter ---------------*/ |
| RCC_OscInitStruct->OscillatorType = RCC_OSCILLATORTYPE_HSE | RCC_OSCILLATORTYPE_HSI \ |
| | RCC_OSCILLATORTYPE_LSE | RCC_OSCILLATORTYPE_LSI | RCC_OSCILLATORTYPE_MSI; |
| #if defined(RCC_HSI48_SUPPORT) |
| RCC_OscInitStruct->OscillatorType |= RCC_OSCILLATORTYPE_HSI48; |
| #endif /* RCC_HSI48_SUPPORT */ |
| |
| |
| /* Get the HSE configuration -----------------------------------------------*/ |
| if((RCC->CR &RCC_CR_HSEBYP) == RCC_CR_HSEBYP) |
| { |
| RCC_OscInitStruct->HSEState = RCC_HSE_BYPASS; |
| } |
| else if((RCC->CR &RCC_CR_HSEON) == RCC_CR_HSEON) |
| { |
| RCC_OscInitStruct->HSEState = RCC_HSE_ON; |
| } |
| else |
| { |
| RCC_OscInitStruct->HSEState = RCC_HSE_OFF; |
| } |
| |
| /* Get the HSI configuration -----------------------------------------------*/ |
| if((RCC->CR &RCC_CR_HSION) == RCC_CR_HSION) |
| { |
| RCC_OscInitStruct->HSIState = RCC_HSI_ON; |
| } |
| else |
| { |
| RCC_OscInitStruct->HSIState = RCC_HSI_OFF; |
| } |
| |
| RCC_OscInitStruct->HSICalibrationValue = (uint32_t)((RCC->ICSCR & RCC_ICSCR_HSITRIM) >> 8); |
| |
| /* Get the MSI configuration -----------------------------------------------*/ |
| if((RCC->CR &RCC_CR_MSION) == RCC_CR_MSION) |
| { |
| RCC_OscInitStruct->MSIState = RCC_MSI_ON; |
| } |
| else |
| { |
| RCC_OscInitStruct->MSIState = RCC_MSI_OFF; |
| } |
| |
| RCC_OscInitStruct->MSICalibrationValue = (uint32_t)((RCC->ICSCR & RCC_ICSCR_MSITRIM) >> RCC_ICSCR_MSITRIM_Pos); |
| RCC_OscInitStruct->MSIClockRange = (uint32_t)((RCC->ICSCR & RCC_ICSCR_MSIRANGE)); |
| |
| /* Get the LSE configuration -----------------------------------------------*/ |
| if((RCC->CSR &RCC_CSR_LSEBYP) == RCC_CSR_LSEBYP) |
| { |
| RCC_OscInitStruct->LSEState = RCC_LSE_BYPASS; |
| } |
| else if((RCC->CSR &RCC_CSR_LSEON) == RCC_CSR_LSEON) |
| { |
| RCC_OscInitStruct->LSEState = RCC_LSE_ON; |
| } |
| else |
| { |
| RCC_OscInitStruct->LSEState = RCC_LSE_OFF; |
| } |
| |
| /* Get the LSI configuration -----------------------------------------------*/ |
| if((RCC->CSR &RCC_CSR_LSION) == RCC_CSR_LSION) |
| { |
| RCC_OscInitStruct->LSIState = RCC_LSI_ON; |
| } |
| else |
| { |
| RCC_OscInitStruct->LSIState = RCC_LSI_OFF; |
| } |
| |
| #if defined(RCC_HSI48_SUPPORT) |
| /* Get the HSI48 configuration if any-----------------------------------------*/ |
| RCC_OscInitStruct->HSI48State = __HAL_RCC_GET_HSI48_STATE(); |
| #endif /* RCC_HSI48_SUPPORT */ |
| |
| /* Get the PLL configuration -----------------------------------------------*/ |
| if((RCC->CR &RCC_CR_PLLON) == RCC_CR_PLLON) |
| { |
| RCC_OscInitStruct->PLL.PLLState = RCC_PLL_ON; |
| } |
| else |
| { |
| RCC_OscInitStruct->PLL.PLLState = RCC_PLL_OFF; |
| } |
| RCC_OscInitStruct->PLL.PLLSource = (uint32_t)(RCC->CFGR & RCC_CFGR_PLLSRC); |
| RCC_OscInitStruct->PLL.PLLMUL = (uint32_t)(RCC->CFGR & RCC_CFGR_PLLMUL); |
| RCC_OscInitStruct->PLL.PLLDIV = (uint32_t)(RCC->CFGR & RCC_CFGR_PLLDIV); |
| } |
| |
| /** |
| * @brief Get the RCC_ClkInitStruct according to the internal |
| * RCC configuration registers. |
| * @param RCC_ClkInitStruct pointer to an RCC_ClkInitTypeDef structure that |
| * contains the current clock configuration. |
| * @param pFLatency Pointer on the Flash Latency. |
| * @retval None |
| */ |
| void HAL_RCC_GetClockConfig(RCC_ClkInitTypeDef *RCC_ClkInitStruct, uint32_t *pFLatency) |
| { |
| /* Check the parameters */ |
| assert_param(RCC_ClkInitStruct != (void *)NULL); |
| assert_param(pFLatency != (void *)NULL); |
| |
| /* Set all possible values for the Clock type parameter --------------------*/ |
| RCC_ClkInitStruct->ClockType = RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2; |
| |
| /* Get the SYSCLK configuration --------------------------------------------*/ |
| RCC_ClkInitStruct->SYSCLKSource = (uint32_t)(RCC->CFGR & RCC_CFGR_SW); |
| |
| /* Get the HCLK configuration ----------------------------------------------*/ |
| RCC_ClkInitStruct->AHBCLKDivider = (uint32_t)(RCC->CFGR & RCC_CFGR_HPRE); |
| |
| /* Get the APB1 configuration ----------------------------------------------*/ |
| RCC_ClkInitStruct->APB1CLKDivider = (uint32_t)(RCC->CFGR & RCC_CFGR_PPRE1); |
| |
| /* Get the APB2 configuration ----------------------------------------------*/ |
| RCC_ClkInitStruct->APB2CLKDivider = (uint32_t)((RCC->CFGR & RCC_CFGR_PPRE2) >> 3); |
| |
| /* Get the Flash Wait State (Latency) configuration ------------------------*/ |
| *pFLatency = __HAL_FLASH_GET_LATENCY(); |
| } |
| |
| #if defined(RCC_HSECSS_SUPPORT) |
| /** |
| * @brief This function handles the RCC CSS interrupt request. |
| * @note This API should be called under the NMI_Handler(). |
| * @retval None |
| */ |
| void HAL_RCC_NMI_IRQHandler(void) |
| { |
| /* Check RCC CSSF flag */ |
| if(__HAL_RCC_GET_IT(RCC_IT_CSS)) |
| { |
| /* RCC Clock Security System interrupt user callback */ |
| HAL_RCC_CSSCallback(); |
| |
| /* Clear RCC CSS pending bit */ |
| __HAL_RCC_CLEAR_IT(RCC_IT_CSS); |
| } |
| } |
| |
| /** |
| * @brief RCC Clock Security System interrupt callback |
| * @retval none |
| */ |
| __weak void HAL_RCC_CSSCallback(void) |
| { |
| /* NOTE : This function Should not be modified, when the callback is needed, |
| the HAL_RCC_CSSCallback could be implemented in the user file |
| */ |
| } |
| |
| #endif /* RCC_HSECSS_SUPPORT */ |
| /** |
| * @} |
| */ |
| |
| /** |
| * @} |
| */ |
| |
| /* Private function prototypes -----------------------------------------------*/ |
| /** @addtogroup RCC_Private_Functions |
| * @{ |
| */ |
| |
| /** |
| * @} |
| */ |
| |
| #endif /* HAL_RCC_MODULE_ENABLED */ |
| /** |
| * @} |
| */ |
| |
| /** |
| * @} |
| */ |
| |
