mirror of
https://github.com/STMicroelectronics/STM32CubeF0.git
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353 lines
12 KiB
C
353 lines
12 KiB
C
/**
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******************************************************************************
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* @file RCC/RCC_ClockConfig/Src/main.c
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* @author MCD Application Team
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* @brief This example describes how to use the RCC HAL API to configure the
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* system clock (SYSCLK) and modify the clock settings on run time.
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******************************************************************************
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* @attention
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*
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* <h2><center>© Copyright (c) 2016 STMicroelectronics.
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* All rights reserved.</center></h2>
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*
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* This software component is licensed by ST under BSD 3-Clause license,
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* the "License"; You may not use this file except in compliance with the
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* License. You may obtain a copy of the License at:
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* opensource.org/licenses/BSD-3-Clause
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*
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******************************************************************************
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*/
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/* Includes ------------------------------------------------------------------*/
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#include "main.h"
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/** @addtogroup STM32F0xx_HAL_Examples
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* @{
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*/
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/** @addtogroup RCC_ClockConfig
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* @{
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*/
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/* Private typedef -----------------------------------------------------------*/
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/* Private define ------------------------------------------------------------*/
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/* Private macro -------------------------------------------------------------*/
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/* Private variables ---------------------------------------------------------*/
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__IO FlagStatus SwitchClock = RESET;
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/* Private function prototypes -----------------------------------------------*/
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void SystemClock_Config(void);
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static void SystemClockHSI_Config(void);
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static void SystemClockHSEbypass_Config(void);
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static void SwitchSystemClock(void);
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static void Error_Handler(void);
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/* Private functions ---------------------------------------------------------*/
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/**
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* @brief Main program
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* @param None
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* @retval None
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*/
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int main(void)
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{
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/* STM32F0xx HAL library initialization:
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- Configure the Flash prefetch
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- Systick timer is configured by default as source of time base, but user
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can eventually implement his proper time base source (a general purpose
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timer for example or other time source), keeping in mind that Time base
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duration should be kept 1ms since PPP_TIMEOUT_VALUEs are defined and
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handled in milliseconds basis.
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- Low Level Initialization
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*/
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HAL_Init();
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/* Enable HSI oscillator and configure the PLL to reach the max system frequency (48 MHz)
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when using HSI oscillator as PLL clock source. */
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SystemClock_Config();
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/* Configure LED2 */
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BSP_LED_Init(LED2);
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/* Initialize User push-button, will be used to trigger an interrupt each time it's pressed.*/
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BSP_PB_Init(BUTTON_USER, BUTTON_MODE_EXTI);
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/* Output SYSCLK on MCO1 pin(PA.08) */
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HAL_RCC_MCOConfig(RCC_MCO1, RCC_MCO1SOURCE_SYSCLK, RCC_MCODIV_1);
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/* Toggle LED2 in an infinite loop */
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while (1)
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{
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/* check if User push-button has been pressed to switch clock config */
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if(SwitchClock != RESET)
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{
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SwitchSystemClock();
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}
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/* Toggle LED2 */
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BSP_LED_Toggle(LED2);
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HAL_Delay(100);
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}
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}
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/**
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* @brief EXTI line detection callbacks.
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* @param GPIO_Pin: Specifies the pins connected EXTI line
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* @retval None
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*/
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void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin)
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{
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if (GPIO_Pin == USER_BUTTON_PIN)
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{
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SwitchClock = SET;
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}
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}
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/**
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* @brief switch in system clock out of ISR context.
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* @retval None
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*/
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static void SwitchSystemClock(void)
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{
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if (__HAL_RCC_GET_PLL_OSCSOURCE() == RCC_PLLSOURCE_HSI)
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{
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/* PLL source is HSI oscillator */
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/* Set SYSCLK frequency to 48000000 Hz, coming from the PLL which is clocked by HSE bypass */
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SystemClockHSEbypass_Config();
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}
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else if (__HAL_RCC_GET_PLL_OSCSOURCE() == RCC_PLLSOURCE_HSE)
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{
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/* PLL source is HSE bypass oscillator */
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/* Set SYSCLK frequency to 48000000 Hz, coming from the PLL which is clocked by HSI */
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SystemClockHSI_Config();
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}
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/* reset global variable */
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SwitchClock = RESET;
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}
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/**
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* @brief System Clock Configuration
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* The system Clock is configured as follow :
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* System Clock source = PLL (HSI)
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* SYSCLK(Hz) = 48000000
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* HCLK(Hz) = 48000000
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* AHB Prescaler = 1
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* APB1 Prescaler = 1
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* HSI Frequency(Hz) = 8000000
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* PREDIV = 2
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* PLLMUL = 12
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* Flash Latency(WS) = 1
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* @param None
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* @retval None
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*/
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void SystemClock_Config(void)
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{
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RCC_ClkInitTypeDef RCC_ClkInitStruct;
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RCC_OscInitTypeDef RCC_OscInitStruct;
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/* No HSE Oscillator on Nucleo, Activate PLL with HSI as source */
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RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_NONE;
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RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
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RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI;
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RCC_OscInitStruct.PLL.PREDIV = RCC_PREDIV_DIV2;
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RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL12;
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if (HAL_RCC_OscConfig(&RCC_OscInitStruct)!= HAL_OK)
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{
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/* Initialization Error */
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while(1);
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}
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/* Select PLL as system clock source and configure the HCLK, PCLK1 clocks dividers */
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RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1);
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RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
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RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
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RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
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if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_1)!= HAL_OK)
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{
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/* Initialization Error */
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while(1);
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}
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}
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/**
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* @brief Switch the PLL source from HSI to HSE bypass, and select the PLL as SYSCLK
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* source.
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* The system Clock is configured as follows :
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* System Clock source = PLL (HSE bypass)
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* SYSCLK(Hz) = 48000000
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* HCLK(Hz) = 48000000
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* AHB Prescaler = 1
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* APB1 Prescaler = 1
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* HSE Frequency(Hz) = 8000000
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* PREDIV = 1
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* PLLMUL = 6
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* Flash Latency(WS) = 1
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* @param None
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* @retval None
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*/
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static void SystemClockHSEbypass_Config(void)
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{
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RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
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RCC_OscInitTypeDef RCC_OscInitStruct = {0};
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/* -1- Select HSI as system clock source to allow modification of the PLL configuration */
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RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_SYSCLK;
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RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_HSI;
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if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_1) != HAL_OK)
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{
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/* Initialization Error */
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Error_Handler();
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}
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/* -2- Enable HSE bypass Oscillator, select it as PLL source and finally activate the PLL */
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RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
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RCC_OscInitStruct.HSEState = RCC_HSE_BYPASS;
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RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
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RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
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RCC_OscInitStruct.PLL.PREDIV = RCC_PREDIV_DIV1;
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RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL6;
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if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
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{
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/* Initialization Error */
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Error_Handler();
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}
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/* -3- Select the PLL as system clock source and configure the HCLK and PCLK1 clocks dividers */
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RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1);
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RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
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RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
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RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
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if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_1) != HAL_OK)
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{
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/* Initialization Error */
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Error_Handler();
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}
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/* -4- Optional: Disable HSI Oscillator (if the HSI is no more needed by the application)*/
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RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
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RCC_OscInitStruct.HSIState = RCC_HSI_OFF;
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RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
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if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
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{
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/* Initialization Error */
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Error_Handler();
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}
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}
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/**
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* @brief Switch the PLL source from HSE bypass to HSI, and select the PLL as SYSCLK
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* source.
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* The system Clock is configured as follows :
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* System Clock source = PLL (HSI)
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* SYSCLK(Hz) = 48000000
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* HCLK(Hz) = 48000000
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* AHB Prescaler = 1
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* APB1 Prescaler = 1
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* HSI Frequency(Hz) = 8000000
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* PREDIV = 2
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* PLLMUL = 12
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* Flash Latency(WS) = 1
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* @param None
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* @retval None
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*/
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static void SystemClockHSI_Config(void)
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{
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RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
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RCC_OscInitTypeDef RCC_OscInitStruct = {0};
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/* -1- Select HSE bypass as system clock source to allow modification of the PLL configuration */
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RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_SYSCLK;
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RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_HSE;
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if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_1) != HAL_OK)
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{
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/* Initialization Error */
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Error_Handler();
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}
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/* -2- Enable HSI Oscillator, select it as PLL source and finally activate the PLL */
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RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
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RCC_OscInitStruct.HSIState = RCC_HSI_ON;
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RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
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RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
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RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI;
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/* PLL source is the HSI frequency multiplied by 12 */
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RCC_OscInitStruct.PLL.PREDIV = RCC_PREDIV_DIV2;
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RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL12;
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if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
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{
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/* Initialization Error */
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Error_Handler();
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}
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/* -3- Select the PLL as system clock source and configure the HCLK and PCLK1 clocks dividers */
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RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1);
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RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
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RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
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RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
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if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_1) != HAL_OK)
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{
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/* Initialization Error */
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Error_Handler();
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}
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/* -4- Optional: Disable HSE bypass Oscillator (if the HSE bypass is no more needed by the application) */
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RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
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RCC_OscInitStruct.HSEState = RCC_HSE_OFF;
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RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
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if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
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{
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/* Initialization Error */
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Error_Handler();
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}
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}
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/**
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* @brief This function is executed in case of error occurrence.
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* @param None
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* @retval None
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*/
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static void Error_Handler(void)
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{
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/* Turn LED2 on */
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BSP_LED_On(LED2);
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while (1)
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{
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}
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}
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#ifdef USE_FULL_ASSERT
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/**
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* @brief Reports the name of the source file and the source line number
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* where the assert_param error has occurred.
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* @param file: pointer to the source file name
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* @param line: assert_param error line source number
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* @retval None
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*/
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void assert_failed(uint8_t *file, uint32_t line)
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{
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/* User can add his own implementation to report the file name and line number,
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ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
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/* Infinite loop */
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while (1)
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{
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}
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}
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#endif
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/**
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* @}
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*/
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/**
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* @}
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*/
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/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
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