RCC_ClockConfig
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Outline
Includes
#include "main.h"
Private variables
SwitchClock
Private function prototypes
main()
HAL_GPIO_EXTI_Callback(uint16_t)
SwitchSystemClock()
SystemClock_Config()
SystemClockHSEbypass_Config()
SystemClockHSI_Config()
Error_Handler()
Files
RCC_ClockConfig
Inc
Src
main.c
stm32f4xx_it.c
system_stm32f4xx.c
CMSIS
HAL
STM32F4xx_Nucleo_144
SourceVuSTM32 Libraries and SamplesRCC_ClockConfigSrc/main.c
 
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/** ****************************************************************************** * @file RCC/RCC_ClockConfig/Src/main.c * @author MCD Application Team * @brief This example describes how to use the RCC HAL API to configure the * system clock (SYSCLK) and modify the clock settings on run time. ****************************************************************************** * @attention * * Copyright (c) 2017 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 "main.h" /** @addtogroup STM32F4xx_HAL_Examples * @{ *//* ... */ /** @addtogroup RCC_ClockConfig * @{ *//* ... */ Includes /* Private typedef -----------------------------------------------------------*/ /* Private define ------------------------------------------------------------*/ /* Private macro -------------------------------------------------------------*/ /* Private variables ---------------------------------------------------------*/ __IO FlagStatus SwitchClock = RESET; Private variables /* Private function prototypes -----------------------------------------------*/ static void SystemClock_Config(void); static void SystemClockHSI_Config(void); static void SystemClockHSEbypass_Config(void); static void SwitchSystemClock(void); static void Error_Handler(void); Private function prototypes /* Private functions ---------------------------------------------------------*/ /** * @brief Main program * @param None * @retval None *//* ... */ int main(void) { /* STM32F4xx HAL library initialization: - Configure the Flash prefetch - Systick timer is configured by default as source of time base, but user can eventually implement his proper time base source (a general purpose timer for example or other time source), keeping in mind that Time base duration should be kept 1ms since PPP_TIMEOUT_VALUEs are defined and handled in milliseconds basis. - Set NVIC Group Priority to 4 - Low Level Initialization *//* ... */ HAL_Init(); /* Configure the system clock to 180 MHz */ SystemClock_Config(); /* Configure LED1, LED2 and LED3 */ BSP_LED_Init(LED1); BSP_LED_Init(LED2); BSP_LED_Init(LED3); /* Initialize User push-button, will be used to trigger an interrupt each time it's pressed.*/ BSP_PB_Init(BUTTON_USER, BUTTON_MODE_EXTI); /* Output SYSCLK / 1 on MCO1 pin(PA.08) */ HAL_RCC_MCOConfig(RCC_MCO1, RCC_MCO1SOURCE_PLLCLK, RCC_MCODIV_1); /* Toggle some leds in an infinite loop */ while (1) { /* check if user button has been pressed to switch clock config */ if(SwitchClock != RESET) { SwitchSystemClock(); }if (SwitchClock != RESET) { ... } /* Toggle LED1 */ BSP_LED_Toggle(LED1); HAL_Delay(100); }while (1) { ... } }{ ... } /** * @brief EXTI line detection callbacks. * @param GPIO_Pin: Specifies the pins connected EXTI line * @retval None *//* ... */ void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin) { if (GPIO_Pin == USER_BUTTON_PIN) { SwitchClock = SET; }if (GPIO_Pin == USER_BUTTON_PIN) { ... } }{ ... } /** * @brief switch in system clock out of ISR context. * @retval None *//* ... */ static void SwitchSystemClock(void) { if (__HAL_RCC_GET_PLL_OSCSOURCE() == RCC_PLLSOURCE_HSI) { /* PLL source is HSE oscillator */ /* Set SYSCLK frequency to 180000000 Hz, coming from the PLL which is clocked by HSE bypass */ SystemClockHSEbypass_Config(); }if (__HAL_RCC_GET_PLL_OSCSOURCE() == RCC_PLLSOURCE_HSI) { ... } else if (__HAL_RCC_GET_PLL_OSCSOURCE() == RCC_PLLSOURCE_HSE) { /* PLL source is HSE bypass oscillator */ /* Set SYSCLK frequency to 80000000 Hz, coming from the PLL which is clocked by HSI */ SystemClockHSI_Config(); }else if (__HAL_RCC_GET_PLL_OSCSOURCE() == RCC_PLLSOURCE_HSE) { ... } /* reset global variable */ SwitchClock = RESET; }{ ... } /** * @brief System Clock Configuration * The system Clock is configured as follow : * System Clock source = PLL (HSE) * SYSCLK(Hz) = 180000000 * HCLK(Hz) = 180000000 * AHB Prescaler = 1 * APB1 Prescaler = 4 * APB2 Prescaler = 2 * HSE Frequency(Hz) = 8000000 * PLL_M = 8 * PLL_N = 360 * PLL_P = 2 * PLL_Q = 7 * PLL_R = 2 * VDD(V) = 3.3 * Main regulator output voltage = Scale1 mode * Flash Latency(WS) = 5 * @param None * @retval None *//* ... */ static void SystemClock_Config(void) { RCC_ClkInitTypeDef RCC_ClkInitStruct; RCC_OscInitTypeDef RCC_OscInitStruct; HAL_StatusTypeDef ret = HAL_OK; /* Enable Power Control clock */ __HAL_RCC_PWR_CLK_ENABLE(); /* The voltage scaling allows optimizing the power consumption when the device is clocked below the maximum system frequency, to update the voltage scaling value regarding system frequency refer to product datasheet. *//* ... */ __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1); /* Enable HSE Oscillator and activate PLL with HSE as source */ RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE; RCC_OscInitStruct.HSEState = RCC_HSE_BYPASS; RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON; RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE; RCC_OscInitStruct.PLL.PLLM = 8; RCC_OscInitStruct.PLL.PLLN = 360; RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2; RCC_OscInitStruct.PLL.PLLQ = 7; RCC_OscInitStruct.PLL.PLLR = 2; ret = HAL_RCC_OscConfig(&RCC_OscInitStruct); if(ret != HAL_OK) { while(1) { ; } }if (ret != HAL_OK) { ... } /* Activate the OverDrive to reach the 180 MHz Frequency */ ret = HAL_PWREx_EnableOverDrive(); if(ret != HAL_OK) { while(1) { ; } }if (ret != HAL_OK) { ... } /* Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2 clocks dividers */ RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2); RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK; RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1; RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV4; RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2; ret = HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_5); if(ret != HAL_OK) { while(1) { ; } }if (ret != HAL_OK) { ... } }{ ... } /** * @brief Switch the PLL source from HSI to HSE bypass, and select the PLL as SYSCLK * source. * The system Clock is configured as follows : * System Clock source = PLL (HSE bypass) * SYSCLK(Hz) = 180000000 * HCLK(Hz) = 180000000 * AHB Prescaler = 1 * APB1 Prescaler = 4 * APB2 Prescaler = 2 * HSE Frequency(Hz) = 8000000 * PLL_M = 8 * PLL_N = 360 * PLL_P = 2 * PLL_Q = 7 * PLL_R = 2 * VDD(V) = 3.3 * HSE Frequency(Hz) = 8000000 * PLL_M = 8 * PLL_N = 200 * PLL_P = 2 * PLL_Q = 7 * PLL_R = 2 * VDD(V) = 3.3 * Flash Latency(WS) = 5 * @param None * @retval None *//* ... */ static void SystemClockHSEbypass_Config(void) { RCC_ClkInitTypeDef RCC_ClkInitStruct = {0}; RCC_OscInitTypeDef RCC_OscInitStruct = {0}; /* -1- Select HSI as system clock source to allow modification of the PLL configuration */ RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_SYSCLK; RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_HSI; if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_1) != HAL_OK) { /* Initialization Error */ Error_Handler(); }if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_1) != HAL_OK) { ... } /* -2- Enable HSE bypass Oscillator, select it as PLL source and finally activate the PLL */ RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE; RCC_OscInitStruct.HSEState = RCC_HSE_BYPASS; RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE; RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON; RCC_OscInitStruct.PLL.PLLM = 8; RCC_OscInitStruct.PLL.PLLN = 360; RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2; RCC_OscInitStruct.PLL.PLLQ = 7; RCC_OscInitStruct.PLL.PLLR = 2; if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) { /* Initialization Error */ Error_Handler(); }if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) { ... } /* -3- Select the PLL as system clock source and configure the HCLK, PCLK1 and PCLK2 clocks dividers */ RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2); RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK; RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1; RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV4; RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2; if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_5) != HAL_OK) { /* Initialization Error */ Error_Handler(); }if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_5) != HAL_OK) { ... } /* -4- Optional: Disable HSI Oscillator (if the HSI is no more needed by the application)*/ RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI; RCC_OscInitStruct.HSIState = RCC_HSI_OFF; RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE; if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) { /* Initialization Error */ Error_Handler(); }if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) { ... } }{ ... } /** * @brief Switch the PLL source from HSE bypass to HSI, and select the PLL as SYSCLK * source. * The system Clock is configured as follows : * System Clock source = PLL (HSI) * SYSCLK(Hz) = 80000000 * HCLK(Hz) = 80000000 * AHB Prescaler = 1 * APB1 Prescaler = 4 * APB2 Prescaler = 2 * HSI Frequency(Hz) = 16000000 * PLL_M = 16 * PLL_N = 320 * PLL_P = 2 * PLL_Q = 7 * PLL_R = 2 * VDD(V) = 3.3 * Flash Latency(WS) = 5 * @param None * @retval None *//* ... */ static void SystemClockHSI_Config(void) { RCC_ClkInitTypeDef RCC_ClkInitStruct = {0}; RCC_OscInitTypeDef RCC_OscInitStruct = {0}; /* -1- Select HSE bypass as system clock source to allow modification of the PLL configuration */ RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_SYSCLK; RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_HSE; if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_1) != HAL_OK) { /* Initialization Error */ Error_Handler(); }if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_1) != HAL_OK) { ... } /* -2- Enable HSI Oscillator, select it as PLL source and finally activate the PLL */ RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI; RCC_OscInitStruct.HSIState = RCC_HSI_ON; RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT; RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON; RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI; RCC_OscInitStruct.PLL.PLLM = 16; RCC_OscInitStruct.PLL.PLLN = 160; RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2; RCC_OscInitStruct.PLL.PLLQ = 7; RCC_OscInitStruct.PLL.PLLR = 2; if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) { /* Initialization Error */ Error_Handler(); }if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) { ... } /* Activate the OverDrive to reach the 180 MHz Frequency */ if(HAL_PWREx_EnableOverDrive() != HAL_OK) { Error_Handler(); }if (HAL_PWREx_EnableOverDrive() != HAL_OK) { ... } /* -3- Select the PLL as system clock source and configure the HCLK, PCLK1 and PCLK2 clocks dividers */ RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2); RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK; RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1; RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV4; RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2; if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_5) != HAL_OK) { /* Initialization Error */ Error_Handler(); }if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_5) != HAL_OK) { ... } /* -4- Optional: Disable HSE bypass Oscillator (if the HSE bypass is no more needed by the application) */ RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE; RCC_OscInitStruct.HSEState = RCC_HSE_OFF; RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE; if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) { /* Initialization Error */ Error_Handler(); }if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) { ... } }{ ... } /** * @brief This function is executed in case of error occurrence. * @param None * @retval None *//* ... */ static void Error_Handler(void) { /* Turn LED2 on */ BSP_LED_On(LED2); while (1) { }while (1) { ... } }{ ... } #ifdef USE_FULL_ASSERT /** * @brief Reports the name of the source file and the source line number * where the assert_param error has occurred. * @param file: pointer to the source file name * @param line: assert_param error line source number * @retval None *//* ... */ void assert_failed(uint8_t *file, uint32_t line) { /* User can add his own implementation to report the file name and line number, ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) *//* ... */ /* Infinite loop */ while (1) { }while (1) { ... } }assert_failed (uint8_t *file, uint32_t line) { ... } /* ... */#endif /** * @} *//* ... */ /** * @} *//* ... */
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