| /** |
| ****************************************************************************** |
| * @file stm32g4xx_ll_utils.c |
| * @author MCD Application Team |
| * @brief UTILS LL module driver. |
| ****************************************************************************** |
| * @attention |
| * |
| * <h2><center>© Copyright (c) 2017 STMicroelectronics. |
| * All rights reserved.</center></h2> |
| * |
| * This software component is licensed by ST under BSD 3-Clause license, |
| * the "License"; You may not use this file except in compliance with the |
| * License. You may obtain a copy of the License at: |
| * opensource.org/licenses/BSD-3-Clause |
| * |
| ****************************************************************************** |
| */ |
| |
| /* Includes ------------------------------------------------------------------*/ |
| #include "stm32g4xx_ll_utils.h" |
| #include "stm32g4xx_ll_rcc.h" |
| #include "stm32g4xx_ll_system.h" |
| #include "stm32g4xx_ll_pwr.h" |
| #ifdef USE_FULL_ASSERT |
| #include "stm32_assert.h" |
| #else |
| #define assert_param(expr) ((void)0U) |
| #endif /* USE_FULL_ASSERT */ |
| |
| /** @addtogroup STM32G4xx_LL_Driver |
| * @{ |
| */ |
| |
| /** @addtogroup UTILS_LL |
| * @{ |
| */ |
| |
| /* Private types -------------------------------------------------------------*/ |
| /* Private variables ---------------------------------------------------------*/ |
| /* Private constants ---------------------------------------------------------*/ |
| /** @addtogroup UTILS_LL_Private_Constants |
| * @{ |
| */ |
| #define UTILS_MAX_FREQUENCY_SCALE1 170000000U /*!< Maximum frequency for system clock at power scale1, in Hz */ |
| #define UTILS_MAX_FREQUENCY_SCALE2 26000000U /*!< Maximum frequency for system clock at power scale2, in Hz */ |
| |
| /* Defines used for PLL range */ |
| #define UTILS_PLLVCO_INPUT_MIN 2660000U /*!< Frequency min for PLLVCO input, in Hz */ |
| #define UTILS_PLLVCO_INPUT_MAX 8000000U /*!< Frequency max for PLLVCO input, in Hz */ |
| #define UTILS_PLLVCO_OUTPUT_MIN 64000000U /*!< Frequency min for PLLVCO output, in Hz */ |
| #define UTILS_PLLVCO_OUTPUT_MAX 344000000U /*!< Frequency max for PLLVCO output, in Hz */ |
| |
| /* Defines used for HSE range */ |
| #define UTILS_HSE_FREQUENCY_MIN 4000000U /*!< Frequency min for HSE frequency, in Hz */ |
| #define UTILS_HSE_FREQUENCY_MAX 48000000U /*!< Frequency max for HSE frequency, in Hz */ |
| |
| /* Defines used for FLASH latency according to HCLK Frequency */ |
| #define UTILS_SCALE1_LATENCY1_FREQ 20000000U /*!< HCLK frequency to set FLASH latency 1 in power scale 1 */ |
| #define UTILS_SCALE1_LATENCY2_FREQ 40000000U /*!< HCLK frequency to set FLASH latency 2 in power scale 1 */ |
| #define UTILS_SCALE1_LATENCY3_FREQ 60000000U /*!< HCLK frequency to set FLASH latency 3 in power scale 1 */ |
| #define UTILS_SCALE1_LATENCY4_FREQ 80000000U /*!< HCLK frequency to set FLASH latency 4 in power scale 1 */ |
| #define UTILS_SCALE1_LATENCY5_FREQ 100000000U /*!< HCLK frequency to set FLASH latency 5 in power scale 1 */ |
| #define UTILS_SCALE1_LATENCY6_FREQ 120000000U /*!< HCLK frequency to set FLASH latency 6 in power scale 1 */ |
| #define UTILS_SCALE1_LATENCY7_FREQ 140000000U /*!< HCLK frequency to set FLASH latency 7 in power scale 1 */ |
| #define UTILS_SCALE1_LATENCY8_FREQ 160000000U /*!< HCLK frequency to set FLASH latency 8 in power scale 1 */ |
| #define UTILS_SCALE1_LATENCY9_FREQ 170000000U /*!< HCLK frequency to set FLASH latency 9 in power scale 1 */ |
| #define UTILS_SCALE2_LATENCY1_FREQ 8000000U /*!< HCLK frequency to set FLASH latency 1 in power scale 2 */ |
| #define UTILS_SCALE2_LATENCY2_FREQ 16000000U /*!< HCLK frequency to set FLASH latency 2 in power scale 2 */ |
| #define UTILS_SCALE2_LATENCY3_FREQ 26000000U /*!< HCLK frequency to set FLASH latency 2 in power scale 2 */ |
| /** |
| * @} |
| */ |
| |
| /* Private macros ------------------------------------------------------------*/ |
| /** @addtogroup UTILS_LL_Private_Macros |
| * @{ |
| */ |
| #define IS_LL_UTILS_SYSCLK_DIV(__VALUE__) (((__VALUE__) == LL_RCC_SYSCLK_DIV_1) \ |
| || ((__VALUE__) == LL_RCC_SYSCLK_DIV_2) \ |
| || ((__VALUE__) == LL_RCC_SYSCLK_DIV_4) \ |
| || ((__VALUE__) == LL_RCC_SYSCLK_DIV_8) \ |
| || ((__VALUE__) == LL_RCC_SYSCLK_DIV_16) \ |
| || ((__VALUE__) == LL_RCC_SYSCLK_DIV_64) \ |
| || ((__VALUE__) == LL_RCC_SYSCLK_DIV_128) \ |
| || ((__VALUE__) == LL_RCC_SYSCLK_DIV_256) \ |
| || ((__VALUE__) == LL_RCC_SYSCLK_DIV_512)) |
| |
| #define IS_LL_UTILS_APB1_DIV(__VALUE__) (((__VALUE__) == LL_RCC_APB1_DIV_1) \ |
| || ((__VALUE__) == LL_RCC_APB1_DIV_2) \ |
| || ((__VALUE__) == LL_RCC_APB1_DIV_4) \ |
| || ((__VALUE__) == LL_RCC_APB1_DIV_8) \ |
| || ((__VALUE__) == LL_RCC_APB1_DIV_16)) |
| |
| #define IS_LL_UTILS_APB2_DIV(__VALUE__) (((__VALUE__) == LL_RCC_APB2_DIV_1) \ |
| || ((__VALUE__) == LL_RCC_APB2_DIV_2) \ |
| || ((__VALUE__) == LL_RCC_APB2_DIV_4) \ |
| || ((__VALUE__) == LL_RCC_APB2_DIV_8) \ |
| || ((__VALUE__) == LL_RCC_APB2_DIV_16)) |
| |
| #define IS_LL_UTILS_PLLM_VALUE(__VALUE__) (((__VALUE__) == LL_RCC_PLLM_DIV_1) \ |
| || ((__VALUE__) == LL_RCC_PLLM_DIV_2) \ |
| || ((__VALUE__) == LL_RCC_PLLM_DIV_3) \ |
| || ((__VALUE__) == LL_RCC_PLLM_DIV_4) \ |
| || ((__VALUE__) == LL_RCC_PLLM_DIV_5) \ |
| || ((__VALUE__) == LL_RCC_PLLM_DIV_6) \ |
| || ((__VALUE__) == LL_RCC_PLLM_DIV_7) \ |
| || ((__VALUE__) == LL_RCC_PLLM_DIV_8) \ |
| || ((__VALUE__) == LL_RCC_PLLM_DIV_9) \ |
| || ((__VALUE__) == LL_RCC_PLLM_DIV_10) \ |
| || ((__VALUE__) == LL_RCC_PLLM_DIV_11) \ |
| || ((__VALUE__) == LL_RCC_PLLM_DIV_12) \ |
| || ((__VALUE__) == LL_RCC_PLLM_DIV_13) \ |
| || ((__VALUE__) == LL_RCC_PLLM_DIV_14) \ |
| || ((__VALUE__) == LL_RCC_PLLM_DIV_15) \ |
| || ((__VALUE__) == LL_RCC_PLLM_DIV_16)) |
| |
| #define IS_LL_UTILS_PLLN_VALUE(__VALUE__) ((8U <= (__VALUE__)) && ((__VALUE__) <= 127U)) |
| |
| #define IS_LL_UTILS_PLLR_VALUE(__VALUE__) (((__VALUE__) == LL_RCC_PLLR_DIV_2) \ |
| || ((__VALUE__) == LL_RCC_PLLR_DIV_4) \ |
| || ((__VALUE__) == LL_RCC_PLLR_DIV_6) \ |
| || ((__VALUE__) == LL_RCC_PLLR_DIV_8)) |
| |
| #define IS_LL_UTILS_PLLVCO_INPUT(__VALUE__) ((UTILS_PLLVCO_INPUT_MIN <= (__VALUE__)) && ((__VALUE__) <= UTILS_PLLVCO_INPUT_MAX)) |
| |
| #define IS_LL_UTILS_PLLVCO_OUTPUT(__VALUE__) ((UTILS_PLLVCO_OUTPUT_MIN <= (__VALUE__)) && ((__VALUE__) <= UTILS_PLLVCO_OUTPUT_MAX)) |
| |
| #define IS_LL_UTILS_PLL_FREQUENCY(__VALUE__) ((LL_PWR_GetRegulVoltageScaling() == LL_PWR_REGU_VOLTAGE_SCALE1) ? ((__VALUE__) <= UTILS_MAX_FREQUENCY_SCALE1) : \ |
| ((__VALUE__) <= UTILS_MAX_FREQUENCY_SCALE2)) |
| |
| #define IS_LL_UTILS_HSE_BYPASS(__STATE__) (((__STATE__) == LL_UTILS_HSEBYPASS_ON) \ |
| || ((__STATE__) == LL_UTILS_HSEBYPASS_OFF)) |
| |
| #define IS_LL_UTILS_HSE_FREQUENCY(__FREQUENCY__) (((__FREQUENCY__) >= UTILS_HSE_FREQUENCY_MIN) && ((__FREQUENCY__) <= UTILS_HSE_FREQUENCY_MAX)) |
| /** |
| * @} |
| */ |
| /* Private function prototypes -----------------------------------------------*/ |
| /** @defgroup UTILS_LL_Private_Functions UTILS Private functions |
| * @{ |
| */ |
| static uint32_t UTILS_GetPLLOutputFrequency(uint32_t PLL_InputFrequency, |
| LL_UTILS_PLLInitTypeDef *UTILS_PLLInitStruct); |
| static ErrorStatus UTILS_SetFlashLatency(uint32_t HCLK_Frequency); |
| static ErrorStatus UTILS_EnablePLLAndSwitchSystem(uint32_t SYSCLK_Frequency, LL_UTILS_ClkInitTypeDef *UTILS_ClkInitStruct); |
| static ErrorStatus UTILS_PLL_IsBusy(void); |
| /** |
| * @} |
| */ |
| |
| /* Exported functions --------------------------------------------------------*/ |
| /** @addtogroup UTILS_LL_Exported_Functions |
| * @{ |
| */ |
| |
| /** @addtogroup UTILS_LL_EF_DELAY |
| * @{ |
| */ |
| |
| /** |
| * @brief This function configures the Cortex-M SysTick source to have 1ms time base. |
| * @note When a RTOS is used, it is recommended to avoid changing the Systick |
| * configuration by calling this function, for a delay use rather osDelay RTOS service. |
| * @param HCLKFrequency HCLK frequency in Hz |
| * @note HCLK frequency can be calculated thanks to RCC helper macro or function @ref LL_RCC_GetSystemClocksFreq |
| * @retval None |
| */ |
| void LL_Init1msTick(uint32_t HCLKFrequency) |
| { |
| /* Use frequency provided in argument */ |
| LL_InitTick(HCLKFrequency, 1000U); |
| } |
| |
| /** |
| * @brief This function provides accurate delay (in milliseconds) based |
| * on SysTick counter flag |
| * @note When a RTOS is used, it is recommended to avoid using blocking delay |
| * and use rather osDelay service. |
| * @note To respect 1ms timebase, user should call @ref LL_Init1msTick function which |
| * will configure Systick to 1ms |
| * @param Delay specifies the delay time length, in milliseconds. |
| * @retval None |
| */ |
| void LL_mDelay(uint32_t Delay) |
| { |
| __IO uint32_t tmp = SysTick->CTRL; /* Clear the COUNTFLAG first */ |
| uint32_t tmpDelay; /* MISRAC2012-Rule-17.8 */ |
| /* Add this code to indicate that local variable is not used */ |
| ((void)tmp); |
| tmpDelay = Delay; |
| /* Add a period to guaranty minimum wait */ |
| if(tmpDelay < LL_MAX_DELAY) |
| { |
| tmpDelay++; |
| } |
| |
| while (tmpDelay != 0U) |
| { |
| if((SysTick->CTRL & SysTick_CTRL_COUNTFLAG_Msk) != 0U) |
| { |
| tmpDelay--; |
| } |
| } |
| } |
| |
| /** |
| * @} |
| */ |
| |
| /** @addtogroup UTILS_EF_SYSTEM |
| * @brief System Configuration functions |
| * |
| @verbatim |
| =============================================================================== |
| ##### System Configuration functions ##### |
| =============================================================================== |
| [..] |
| System, AHB and APB buses clocks configuration |
| |
| (+) The maximum frequency of the SYSCLK, HCLK, PCLK1 and PCLK2 is |
| 170000000 Hz for STM32G4xx. |
| @endverbatim |
| @internal |
| Depending on the device voltage range, the maximum frequency should be |
| adapted accordingly: |
| |
| (++) Table 1. HCLK clock frequency for STM32G4xx devices |
| (++) +--------------------------------------------------------+ |
| (++) | Latency | HCLK clock frequency (MHz) | |
| (++) | |--------------------------------------| |
| (++) | | voltage range 1 | voltage range 2 | |
| (++) | | 1.2 V | 1.0 V | |
| (++) |-----------------|-------------------|------------------| |
| (++) |0WS(1 CPU cycles)| 0 < HCLK <= 20 | 0 < HCLK <= 8 | |
| (++) |-----------------|-------------------|------------------| |
| (++) |1WS(2 CPU cycles)| 20 < HCLK <= 40 | 8 < HCLK <= 16 | |
| (++) |-----------------|-------------------|------------------| |
| (++) |2WS(3 CPU cycles)| 40 < HCLK <= 60 | 16 < HCLK <= 26 | |
| (++) |-----------------|-------------------|------------------| |
| (++) |3WS(4 CPU cycles)| 60 < HCLK <= 80 | 16 < HCLK <= 26 | |
| (++) |-----------------|-------------------|------------------| |
| (++) |4WS(5 CPU cycles)| 80 < HCLK <= 100 | 16 < HCLK <= 26 | |
| (++) |-----------------|-------------------|------------------| |
| (++) |5WS(6 CPU cycles)| 100 < HCLK <= 120 | 16 < HCLK <= 26 | |
| (++) |-----------------|-------------------|------------------| |
| (++) |6WS(7 CPU cycles)| 120 < HCLK <= 140 | 16 < HCLK <= 26 | |
| (++) |-----------------|-------------------|------------------| |
| (++) |7WS(8 CPU cycles)| 140 < HCLK <= 160 | 16 < HCLK <= 26 | |
| (++) |-----------------|-------------------|------------------| |
| (++) |8WS(9 CPU cycles)| 160 < HCLK <= 170 | 16 < HCLK <= 26 | |
| (++) +--------------------------------------------------------+ |
| |
| |
| @endinternal |
| * @{ |
| */ |
| |
| /** |
| * @brief This function sets directly SystemCoreClock CMSIS variable. |
| * @note Variable can be calculated also through SystemCoreClockUpdate function. |
| * @param HCLKFrequency HCLK frequency in Hz (can be calculated thanks to RCC helper macro) |
| * @retval None |
| */ |
| void LL_SetSystemCoreClock(uint32_t HCLKFrequency) |
| { |
| /* HCLK clock frequency */ |
| SystemCoreClock = HCLKFrequency; |
| } |
| |
| /** |
| * @brief This function configures system clock at maximum frequency with HSI as clock source of the PLL |
| * @note The application need to ensure that PLL is disabled. |
| * @note Function is based on the following formula: |
| * - PLL output frequency = (((HSI frequency / PLLM) * PLLN) / PLLR) |
| * - PLLM: ensure that the VCO input frequency ranges from 2.66 to 8 MHz (PLLVCO_input = HSI frequency / PLLM) |
| * - PLLN: ensure that the VCO output frequency is between 64 and 344 MHz (PLLVCO_output = PLLVCO_input * PLLN) |
| * - PLLR: ensure that max frequency at 170000000 Hz is reach (PLLVCO_output / PLLR) |
| * @param UTILS_PLLInitStruct pointer to a @ref LL_UTILS_PLLInitTypeDef structure that contains |
| * the configuration information for the PLL. |
| * @param UTILS_ClkInitStruct pointer to a @ref LL_UTILS_ClkInitTypeDef structure that contains |
| * the configuration information for the BUS prescalers. |
| * @retval An ErrorStatus enumeration value: |
| * - SUCCESS: Max frequency configuration done |
| * - ERROR: Max frequency configuration not done |
| */ |
| ErrorStatus LL_PLL_ConfigSystemClock_HSI(LL_UTILS_PLLInitTypeDef *UTILS_PLLInitStruct, |
| LL_UTILS_ClkInitTypeDef *UTILS_ClkInitStruct) |
| { |
| ErrorStatus status; |
| uint32_t pllfreq; |
| uint32_t hpre = 0U; |
| |
| /* Check if one of the PLL is enabled */ |
| if(UTILS_PLL_IsBusy() == SUCCESS) |
| { |
| /* Calculate the new PLL output frequency */ |
| pllfreq = UTILS_GetPLLOutputFrequency(HSI_VALUE, UTILS_PLLInitStruct); |
| |
| /* Enable HSI if not enabled */ |
| if(LL_RCC_HSI_IsReady() != 1U) |
| { |
| LL_RCC_HSI_Enable(); |
| while (LL_RCC_HSI_IsReady() != 1U) |
| { |
| /* Wait for HSI ready */ |
| } |
| } |
| |
| /* Configure PLL */ |
| LL_RCC_PLL_ConfigDomain_SYS(LL_RCC_PLLSOURCE_HSI, UTILS_PLLInitStruct->PLLM, UTILS_PLLInitStruct->PLLN, |
| UTILS_PLLInitStruct->PLLR); |
| |
| /* Prevent undershoot at highest frequency by applying intermediate AHB prescaler 2 */ |
| if(pllfreq > 80000000U) |
| { |
| hpre = UTILS_ClkInitStruct->AHBCLKDivider; |
| if(hpre == LL_RCC_SYSCLK_DIV_1) |
| { |
| UTILS_ClkInitStruct->AHBCLKDivider = LL_RCC_SYSCLK_DIV_2; |
| } |
| } |
| |
| /* Enable PLL and switch system clock to PLL */ |
| status = UTILS_EnablePLLAndSwitchSystem(pllfreq, UTILS_ClkInitStruct); |
| |
| /* Apply definitive AHB prescaler value if necessary */ |
| if((status == SUCCESS) && (hpre != 0U)) |
| { |
| UTILS_ClkInitStruct->AHBCLKDivider = LL_RCC_SYSCLK_DIV_1; |
| LL_RCC_SetAHBPrescaler(UTILS_ClkInitStruct->AHBCLKDivider); |
| } |
| } |
| else |
| { |
| /* Current PLL configuration cannot be modified */ |
| status = ERROR; |
| } |
| |
| return status; |
| } |
| |
| /** |
| * @brief This function configures system clock with HSE as clock source of the PLL |
| * @note The application need to ensure that PLL is disabled. |
| * @note Function is based on the following formula: |
| * - PLL output frequency = (((HSE frequency / PLLM) * PLLN) / PLLR) |
| * - PLLM: ensure that the VCO input frequency ranges from 2.66 to 8 MHz (PLLVCO_input = HSE frequency / PLLM) |
| * - PLLN: ensure that the VCO output frequency is between 64 and 344 MHz (PLLVCO_output = PLLVCO_input * PLLN) |
| * - PLLR: ensure that max frequency at 170000000 Hz is reached (PLLVCO_output / PLLR) |
| * @param HSEFrequency Value between Min_Data = 4000000 and Max_Data = 48000000 |
| * @param HSEBypass This parameter can be one of the following values: |
| * @arg @ref LL_UTILS_HSEBYPASS_ON |
| * @arg @ref LL_UTILS_HSEBYPASS_OFF |
| * @param UTILS_PLLInitStruct pointer to a @ref LL_UTILS_PLLInitTypeDef structure that contains |
| * the configuration information for the PLL. |
| * @param UTILS_ClkInitStruct pointer to a @ref LL_UTILS_ClkInitTypeDef structure that contains |
| * the configuration information for the BUS prescalers. |
| * @retval An ErrorStatus enumeration value: |
| * - SUCCESS: Max frequency configuration done |
| * - ERROR: Max frequency configuration not done |
| */ |
| ErrorStatus LL_PLL_ConfigSystemClock_HSE(uint32_t HSEFrequency, uint32_t HSEBypass, |
| LL_UTILS_PLLInitTypeDef *UTILS_PLLInitStruct, LL_UTILS_ClkInitTypeDef *UTILS_ClkInitStruct) |
| { |
| ErrorStatus status; |
| uint32_t pllfreq; |
| uint32_t hpre = 0U; |
| |
| /* Check the parameters */ |
| assert_param(IS_LL_UTILS_HSE_FREQUENCY(HSEFrequency)); |
| assert_param(IS_LL_UTILS_HSE_BYPASS(HSEBypass)); |
| |
| /* Check if one of the PLL is enabled */ |
| if(UTILS_PLL_IsBusy() == SUCCESS) |
| { |
| /* Calculate the new PLL output frequency */ |
| pllfreq = UTILS_GetPLLOutputFrequency(HSEFrequency, UTILS_PLLInitStruct); |
| |
| /* Enable HSE if not enabled */ |
| if(LL_RCC_HSE_IsReady() != 1U) |
| { |
| /* Check if need to enable HSE bypass feature or not */ |
| if(HSEBypass == LL_UTILS_HSEBYPASS_ON) |
| { |
| LL_RCC_HSE_EnableBypass(); |
| } |
| else |
| { |
| LL_RCC_HSE_DisableBypass(); |
| } |
| |
| /* Enable HSE */ |
| LL_RCC_HSE_Enable(); |
| while (LL_RCC_HSE_IsReady() != 1U) |
| { |
| /* Wait for HSE ready */ |
| } |
| } |
| |
| /* Configure PLL */ |
| LL_RCC_PLL_ConfigDomain_SYS(LL_RCC_PLLSOURCE_HSE, UTILS_PLLInitStruct->PLLM, UTILS_PLLInitStruct->PLLN, |
| UTILS_PLLInitStruct->PLLR); |
| |
| /* Prevent undershoot at highest frequency by applying intermediate AHB prescaler 2 */ |
| if(pllfreq > 80000000U) |
| { |
| hpre = UTILS_ClkInitStruct->AHBCLKDivider; |
| if(hpre == LL_RCC_SYSCLK_DIV_1) |
| { |
| UTILS_ClkInitStruct->AHBCLKDivider = LL_RCC_SYSCLK_DIV_2; |
| } |
| } |
| |
| /* Enable PLL and switch system clock to PLL */ |
| status = UTILS_EnablePLLAndSwitchSystem(pllfreq, UTILS_ClkInitStruct); |
| |
| /* Apply definitive AHB prescaler value if necessary */ |
| if((status == SUCCESS) && (hpre != 0U)) |
| { |
| UTILS_ClkInitStruct->AHBCLKDivider = LL_RCC_SYSCLK_DIV_1; |
| LL_RCC_SetAHBPrescaler(UTILS_ClkInitStruct->AHBCLKDivider); |
| } |
| } |
| else |
| { |
| /* Current PLL configuration cannot be modified */ |
| status = ERROR; |
| } |
| |
| return status; |
| } |
| |
| /** |
| * @} |
| */ |
| |
| /** |
| * @} |
| */ |
| |
| /** @addtogroup UTILS_LL_Private_Functions |
| * @{ |
| */ |
| /** |
| * @brief Update number of Flash wait states in line with new frequency and current |
| voltage range. |
| * @param HCLK_Frequency HCLK frequency |
| * @retval An ErrorStatus enumeration value: |
| * - SUCCESS: Latency has been modified |
| * - ERROR: Latency cannot be modified |
| */ |
| static ErrorStatus UTILS_SetFlashLatency(uint32_t HCLK_Frequency) |
| { |
| ErrorStatus status = SUCCESS; |
| |
| uint32_t latency = LL_FLASH_LATENCY_0; /* default value 0WS */ |
| |
| /* Frequency cannot be equal to 0 */ |
| if(HCLK_Frequency == 0U) |
| { |
| status = ERROR; |
| } |
| else |
| { |
| if(LL_PWR_GetRegulVoltageScaling() == LL_PWR_REGU_VOLTAGE_SCALE1) |
| { |
| if(HCLK_Frequency > UTILS_SCALE1_LATENCY8_FREQ) |
| { |
| /* 160 < HCLK <= 170 => 8WS (9 CPU cycles) */ |
| latency = LL_FLASH_LATENCY_8; |
| } |
| else if(HCLK_Frequency > UTILS_SCALE1_LATENCY7_FREQ) |
| { |
| /* 140 < HCLK <= 160 => 7WS (8 CPU cycles) */ |
| latency = LL_FLASH_LATENCY_7; |
| } |
| else if(HCLK_Frequency > UTILS_SCALE1_LATENCY6_FREQ) |
| { |
| /* 120 < HCLK <= 140 => 6WS (7 CPU cycles) */ |
| latency = LL_FLASH_LATENCY_6; |
| } |
| else if(HCLK_Frequency > UTILS_SCALE1_LATENCY5_FREQ) |
| { |
| /* 100 < HCLK <= 120 => 5WS (6 CPU cycles) */ |
| latency = LL_FLASH_LATENCY_5; |
| } |
| else if(HCLK_Frequency > UTILS_SCALE1_LATENCY4_FREQ) |
| { |
| /* 80 < HCLK <= 100 => 4WS (5 CPU cycles) */ |
| latency = LL_FLASH_LATENCY_4; |
| } |
| else if(HCLK_Frequency > UTILS_SCALE1_LATENCY3_FREQ) |
| { |
| /* 60 < HCLK <= 80 => 3WS (4 CPU cycles) */ |
| latency = LL_FLASH_LATENCY_3; |
| } |
| else if(HCLK_Frequency > UTILS_SCALE1_LATENCY2_FREQ) |
| { |
| /* 40 < HCLK <= 60 => 2WS (3 CPU cycles) */ |
| latency = LL_FLASH_LATENCY_2; |
| } |
| else |
| { |
| if(HCLK_Frequency > UTILS_SCALE1_LATENCY1_FREQ) |
| { |
| /* 20 < HCLK <= 40 => 1WS (2 CPU cycles) */ |
| latency = LL_FLASH_LATENCY_1; |
| } |
| /* else HCLK_Frequency <= 10MHz default LL_FLASH_LATENCY_0 0WS */ |
| } |
| } |
| else /* SCALE2 */ |
| { |
| if(HCLK_Frequency > UTILS_SCALE2_LATENCY2_FREQ) |
| { |
| /* 16 < HCLK <= 26 => 2WS (3 CPU cycles) */ |
| latency = LL_FLASH_LATENCY_2; |
| } |
| else |
| { |
| if(HCLK_Frequency > UTILS_SCALE2_LATENCY1_FREQ) |
| { |
| /* 8 < HCLK <= 16 => 1WS (2 CPU cycles) */ |
| latency = LL_FLASH_LATENCY_1; |
| } |
| /* else HCLK_Frequency <= 8MHz default LL_FLASH_LATENCY_0 0WS */ |
| } |
| } |
| |
| LL_FLASH_SetLatency(latency); |
| |
| /* Check that the new number of wait states is taken into account to access the Flash |
| memory by reading the FLASH_ACR register */ |
| if(LL_FLASH_GetLatency() != latency) |
| { |
| status = ERROR; |
| } |
| } |
| return status; |
| } |
| |
| /** |
| * @brief Function to check that PLL can be modified |
| * @param PLL_InputFrequency PLL input frequency (in Hz) |
| * @param UTILS_PLLInitStruct pointer to a @ref LL_UTILS_PLLInitTypeDef structure that contains |
| * the configuration information for the PLL. |
| * @retval PLL output frequency (in Hz) |
| */ |
| static uint32_t UTILS_GetPLLOutputFrequency(uint32_t PLL_InputFrequency, LL_UTILS_PLLInitTypeDef *UTILS_PLLInitStruct) |
| { |
| uint32_t pllfreq; |
| |
| /* Check the parameters */ |
| assert_param(IS_LL_UTILS_PLLM_VALUE(UTILS_PLLInitStruct->PLLM)); |
| assert_param(IS_LL_UTILS_PLLN_VALUE(UTILS_PLLInitStruct->PLLN)); |
| assert_param(IS_LL_UTILS_PLLR_VALUE(UTILS_PLLInitStruct->PLLR)); |
| |
| /* Check different PLL parameters according to RM */ |
| /* - PLLM: ensure that the VCO input frequency ranges from 2.66 to 8 MHz. */ |
| pllfreq = PLL_InputFrequency / (((UTILS_PLLInitStruct->PLLM >> RCC_PLLCFGR_PLLM_Pos) + 1U)); |
| assert_param(IS_LL_UTILS_PLLVCO_INPUT(pllfreq)); |
| |
| /* - PLLN: ensure that the VCO output frequency is between 64 and 344 MHz.*/ |
| pllfreq = pllfreq * (UTILS_PLLInitStruct->PLLN & (RCC_PLLCFGR_PLLN >> RCC_PLLCFGR_PLLN_Pos)); |
| assert_param(IS_LL_UTILS_PLLVCO_OUTPUT(pllfreq)); |
| |
| /* - PLLR: ensure that max frequency at 170000000 Hz is reached */ |
| pllfreq = pllfreq / (((UTILS_PLLInitStruct->PLLR >> RCC_PLLCFGR_PLLR_Pos) + 1U) * 2U); |
| assert_param(IS_LL_UTILS_PLL_FREQUENCY(pllfreq)); |
| |
| return pllfreq; |
| } |
| |
| /** |
| * @brief Function to check that PLL can be modified |
| * @retval An ErrorStatus enumeration value: |
| * - SUCCESS: PLL modification can be done |
| * - ERROR: PLL is busy |
| */ |
| static ErrorStatus UTILS_PLL_IsBusy(void) |
| { |
| ErrorStatus status = SUCCESS; |
| |
| /* Check if PLL is busy*/ |
| if(LL_RCC_PLL_IsReady() != 0U) |
| { |
| /* PLL configuration cannot be modified */ |
| status = ERROR; |
| } |
| |
| return status; |
| } |
| |
| /** |
| * @brief Function to enable PLL and switch system clock to PLL |
| * @param SYSCLK_Frequency SYSCLK frequency |
| * @param UTILS_ClkInitStruct pointer to a @ref LL_UTILS_ClkInitTypeDef structure that contains |
| * the configuration information for the BUS prescalers. |
| * @retval An ErrorStatus enumeration value: |
| * - SUCCESS: No problem to switch system to PLL |
| * - ERROR: Problem to switch system to PLL |
| */ |
| static ErrorStatus UTILS_EnablePLLAndSwitchSystem(uint32_t SYSCLK_Frequency, LL_UTILS_ClkInitTypeDef *UTILS_ClkInitStruct) |
| { |
| ErrorStatus status = SUCCESS; |
| uint32_t hclk_frequency; |
| |
| assert_param(IS_LL_UTILS_SYSCLK_DIV(UTILS_ClkInitStruct->AHBCLKDivider)); |
| assert_param(IS_LL_UTILS_APB1_DIV(UTILS_ClkInitStruct->APB1CLKDivider)); |
| assert_param(IS_LL_UTILS_APB2_DIV(UTILS_ClkInitStruct->APB2CLKDivider)); |
| |
| /* Calculate HCLK frequency */ |
| hclk_frequency = __LL_RCC_CALC_HCLK_FREQ(SYSCLK_Frequency, UTILS_ClkInitStruct->AHBCLKDivider); |
| |
| /* Increasing the number of wait states because of higher CPU frequency */ |
| if(SystemCoreClock < hclk_frequency) |
| { |
| /* Set FLASH latency to highest latency */ |
| status = UTILS_SetFlashLatency(hclk_frequency); |
| } |
| |
| /* Update system clock configuration */ |
| if(status == SUCCESS) |
| { |
| /* Enable PLL */ |
| LL_RCC_PLL_Enable(); |
| LL_RCC_PLL_EnableDomain_SYS(); |
| while (LL_RCC_PLL_IsReady() != 1U) |
| { |
| /* Wait for PLL ready */ |
| } |
| |
| /* Sysclk activation on the main PLL */ |
| LL_RCC_SetAHBPrescaler(UTILS_ClkInitStruct->AHBCLKDivider); |
| LL_RCC_SetSysClkSource(LL_RCC_SYS_CLKSOURCE_PLL); |
| while (LL_RCC_GetSysClkSource() != LL_RCC_SYS_CLKSOURCE_STATUS_PLL) |
| { |
| /* Wait for system clock switch to PLL */ |
| } |
| |
| /* Set APB1 & APB2 prescaler*/ |
| LL_RCC_SetAPB1Prescaler(UTILS_ClkInitStruct->APB1CLKDivider); |
| LL_RCC_SetAPB2Prescaler(UTILS_ClkInitStruct->APB2CLKDivider); |
| } |
| |
| /* Decreasing the number of wait states because of lower CPU frequency */ |
| if(SystemCoreClock > hclk_frequency) |
| { |
| /* Set FLASH latency to lowest latency */ |
| status = UTILS_SetFlashLatency(hclk_frequency); |
| } |
| |
| /* Update SystemCoreClock variable */ |
| if(status == SUCCESS) |
| { |
| LL_SetSystemCoreClock(hclk_frequency); |
| } |
| |
| return status; |
| } |
| |
| /** |
| * @} |
| */ |
| |
| /** |
| * @} |
| */ |
| |
| /** |
| * @} |
| */ |
| |
| /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/ |
