mirror of
https://github.com/STMicroelectronics/STM32CubeF4.git
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337 lines
12 KiB
C
337 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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* Copyright (c) 2017 STMicroelectronics.
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* All rights reserved.
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*
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* This software is licensed under terms that can be found in the LICENSE file
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* in the root directory of this software component.
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* If no LICENSE file comes with this software, it is provided AS-IS.
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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 STM32F4xx_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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static RCC_ClkInitTypeDef RCC_ClkInitStruct;
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static RCC_OscInitTypeDef RCC_OscInitStruct;
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/* Private function prototypes -----------------------------------------------*/
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static void SystemClockHSI_Config(void);
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static void SystemClockHSE_Config(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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/* STM32F4xx HAL library initialization:
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- Configure the Flash prefetch, instruction and Data caches
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- Configure the Systick to generate an interrupt each 1 msec
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- Set NVIC Group Priority to 4
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- Global MSP (MCU Support Package) initialization
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*/
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HAL_Init();
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/* Configure LED1, LED2, LED3 and LED4 */
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BSP_LED_Init(LED1);
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BSP_LED_Init(LED2);
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BSP_LED_Init(LED3);
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BSP_LED_Init(LED4);
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/* Configure Key Button, will be used to trigger an interrupt each time it's pressed.
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In the ISR the PLL source will be changed from HSE to HSI, and vice versa. */
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BSP_PB_Init(BUTTON_KEY, BUTTON_MODE_EXTI);
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/* Enable Power Control clock */
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__HAL_RCC_PWR_CLK_ENABLE();
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/* The voltage scaling allows optimizing the power consumption when the device is
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clocked below the maximum system frequency, to update the voltage scaling value
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regarding system frequency refer to product datasheet. */
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__HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
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/* Enable HSE oscillator and configure the PLL to reach the max system frequency (168MHz)
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when using HSE oscillator as PLL clock source. */
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RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
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RCC_OscInitStruct.HSEState = RCC_HSE_ON;
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RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
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RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
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RCC_OscInitStruct.PLL.PLLM = 25;
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RCC_OscInitStruct.PLL.PLLN = 336;
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RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
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RCC_OscInitStruct.PLL.PLLQ = 7;
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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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/* Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2 clocks dividers.
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The SysTick 1 msec interrupt is required for the HAL process (Timeout management); by default
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the configuration is done using the HAL_Init() API, and when the system clock configuration
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is updated the SysTick configuration will be adjusted by the HAL_RCC_ClockConfig() API. */
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RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
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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_DIV4;
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RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2;
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if(HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_5) != 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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/* STM32F405x/407x/415x/417x Revision Z and upper devices: prefetch is supported */
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if (HAL_GetREVID() >= 0x1001)
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{
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/* Enable the Flash prefetch */
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__HAL_FLASH_PREFETCH_BUFFER_ENABLE();
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}
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/* Output SYSCLK divided by 2 on MCO2 pin(PC9) */
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HAL_RCC_MCOConfig(RCC_MCO2, RCC_MCO2SOURCE_SYSCLK, RCC_MCODIV_2);
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/* Toggle some LEDs in an infinite loop */
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while (1)
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{
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/* Toggle LED1 */
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BSP_LED_Toggle(LED1);
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HAL_Delay(100);
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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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/* Toggle LED4 */
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BSP_LED_Toggle(LED4);
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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 == KEY_BUTTON_PIN)
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{
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if(__HAL_RCC_GET_PLL_OSCSOURCE() == RCC_PLLCFGR_PLLSRC_HSI)
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{
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/* Set SYSCLK frequency to 168 MHz, coming from the PLL which is clocked by the HSE */
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SystemClockHSE_Config();
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}
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else /* PLL source is HSE oscillator */
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{
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/* Set SYSCLK frequency to 168 MHz, coming from the PLL which is clocked by the HSI */
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SystemClockHSI_Config();
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}
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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, and select the PLL as SYSCLK
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* source.
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* The system Clock is configured as follow :
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* System Clock source = PLL (HSE)
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* SYSCLK(Hz) = 168000000
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* HCLK(Hz) = 168000000
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* AHB Prescaler = 1
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* APB1 Prescaler = 4
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* APB2 Prescaler = 2
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* HSE Frequency(Hz) = 25000000
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* PLL_M = 25
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* PLL_N = 336
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* PLL_P = 2
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* PLL_Q = 7
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* VDD(V) = 3.3
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* Main regulator output voltage = Scale1 mode
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* Flash Latency(WS) = 5
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* @param None
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* @retval None
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*/
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void SystemClockHSE_Config(void)
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{
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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 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_ON;
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RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
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RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
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RCC_OscInitStruct.PLL.PLLM = 25;
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RCC_OscInitStruct.PLL.PLLN = 336;
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RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
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RCC_OscInitStruct.PLL.PLLQ = 7;
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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, PCLK1 and PCLK2 clocks dividers */
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RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
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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_DIV4;
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RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2;
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if(HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_5) != 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 HSI to HSE, and select the PLL as SYSCLK
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* source.
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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) = 168000000
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* HCLK(Hz) = 168000000
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* AHB Prescaler = 1
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* APB1 Prescaler = 4
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* APB2 Prescaler = 2
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* HSI Frequency(Hz) = 16000000
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* PLL_M = 16
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* PLL_N = 336
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* PLL_P = 2
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* VDD(V) = 3.3
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* Main regulator output voltage = Scale1 mode
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* Flash Latency(WS) = 5
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* @param None
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* @retval None
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*/
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void SystemClockHSI_Config(void)
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{
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/* -1- Select HSE 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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RCC_OscInitStruct.PLL.PLLM = 16;
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RCC_OscInitStruct.PLL.PLLN = 336;
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RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
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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, PCLK1 and PCLK2 clocks dividers */
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RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
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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_DIV4;
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RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2;
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if(HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_5) != 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 Oscillator (if the HSE 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 LED3 on */
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BSP_LED_On(LED3);
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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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