mirror of
https://github.com/STMicroelectronics/STM32CubeF4.git
synced 2025-04-28 13:48:54 +08:00
344 lines
12 KiB
C
344 lines
12 KiB
C
/**
|
|
******************************************************************************
|
|
* @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
|
|
* @{
|
|
*/
|
|
|
|
/* Private typedef -----------------------------------------------------------*/
|
|
/* Private define ------------------------------------------------------------*/
|
|
/* Private macro -------------------------------------------------------------*/
|
|
/* Private variables ---------------------------------------------------------*/
|
|
static RCC_ClkInitTypeDef RCC_ClkInitStruct;
|
|
static RCC_OscInitTypeDef RCC_OscInitStruct;
|
|
|
|
/* Private function prototypes -----------------------------------------------*/
|
|
static void SystemClockHSI_Config(void);
|
|
static void SystemClockHSE_Config(void);
|
|
static void Error_Handler(void);
|
|
|
|
/* Private functions ---------------------------------------------------------*/
|
|
|
|
/**
|
|
* @brief Main program
|
|
* @param None
|
|
* @retval None
|
|
*/
|
|
int main(void)
|
|
{
|
|
/* STM32F4xx HAL library initialization:
|
|
- Configure the Flash prefetch, instruction and Data caches
|
|
- Configure the Systick to generate an interrupt each 1 msec
|
|
- Set NVIC Group Priority to 4
|
|
- Global MSP (MCU Support Package) initialization
|
|
*/
|
|
HAL_Init();
|
|
|
|
/* Configure LED2 */
|
|
BSP_LED_Init(LED2);
|
|
|
|
/* Configure USER Button used to trigger an interrupt each time it's pressed.
|
|
In the ISR the PLL source will be changed from HSI to HSE, and vice versa. */
|
|
BSP_PB_Init(BUTTON_KEY, BUTTON_MODE_EXTI);
|
|
|
|
/* 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 HSI oscillator and configure the PLL to reach the max system frequency (100MHz)
|
|
when using HSI oscillator as PLL clock source. */
|
|
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 = 400;
|
|
RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV4;
|
|
RCC_OscInitStruct.PLL.PLLQ = 7;
|
|
if(HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
|
|
{
|
|
/* Initialization Error */
|
|
Error_Handler();
|
|
}
|
|
|
|
/* Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2 clocks dividers.
|
|
The SysTick 1 msec interrupt is required for the HAL process (Timeout management); by default
|
|
the configuration is done using the HAL_Init() API, and when the system clock configuration
|
|
is updated the SysTick configuration will be adjusted by the HAL_RCC_ClockConfig() API. */
|
|
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_DIV2;
|
|
RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
|
|
if(HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_3) != HAL_OK)
|
|
{
|
|
/* Initialization Error */
|
|
Error_Handler();
|
|
}
|
|
|
|
/* Output SYSCLK divided by 2 on MCO2 pin(PC9) */
|
|
HAL_RCC_MCOConfig(RCC_MCO2, RCC_MCO2SOURCE_SYSCLK, RCC_MCODIV_2);
|
|
|
|
/* Infinite loop */
|
|
while (1)
|
|
{
|
|
/* Toggle LED2 */
|
|
BSP_LED_Toggle(LED2);
|
|
HAL_Delay(100);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @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 == KEY_BUTTON_PIN)
|
|
{
|
|
if(__HAL_RCC_GET_PLL_OSCSOURCE() == RCC_PLLSOURCE_HSI)
|
|
{
|
|
/* Set SYSCLK frequency to 100 MHz, coming from the PLL which is clocked by the HSE */
|
|
SystemClockHSE_Config();
|
|
}
|
|
else /* PLL source is HSE oscillator */
|
|
{
|
|
/* Set SYSCLK frequency to 100 MHz, coming from the PLL which is clocked by the HSI */
|
|
SystemClockHSI_Config();
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @brief System Clock Configuration
|
|
* The system Clock is configured as follow :
|
|
* System Clock source = PLL (HSE_CRYSTAL or HSE_BYPASS)
|
|
* SYSCLK(Hz) = 100000000
|
|
* HCLK(Hz) = 100000000
|
|
* AHB Prescaler = 1
|
|
* APB1 Prescaler = 2
|
|
* APB2 Prescaler = 1
|
|
* HSE Frequency(Hz) = 16000000
|
|
* PLL_M = 16
|
|
* PLL_N = 400
|
|
* PLL_P = 4
|
|
* PLL_Q = 7
|
|
* VDD(V) = 3.3
|
|
* Main regulator output voltage = Scale1 mode
|
|
* Flash Latency(WS) = 3
|
|
* @param None
|
|
* @retval None
|
|
*/
|
|
void SystemClockHSE_Config(void)
|
|
{
|
|
RCC_ClkInitTypeDef RCC_ClkInitStruct;
|
|
RCC_OscInitTypeDef RCC_OscInitStruct;
|
|
|
|
/* 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);
|
|
|
|
/* -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_3) != HAL_OK)
|
|
{
|
|
Error_Handler();
|
|
}
|
|
|
|
/* -2- Enable HSE Oscillator, select it as PLL source and finally activate the PLL */
|
|
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
|
|
|
|
#ifdef HSE_CRYSTAL
|
|
RCC_OscInitStruct.HSEState = RCC_HSE_ON;
|
|
#elif defined (HSE_BYPASS)
|
|
RCC_OscInitStruct.HSEState = RCC_HSE_BYPASS;
|
|
#endif /* HSE_CRYSTAL */
|
|
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
|
|
RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
|
|
RCC_OscInitStruct.PLL.PLLM = 8;
|
|
RCC_OscInitStruct.PLL.PLLN = 400;
|
|
RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV4;
|
|
RCC_OscInitStruct.PLL.PLLQ = 7;
|
|
if(HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
|
|
{
|
|
/* Initialization Error */
|
|
Error_Handler();
|
|
}
|
|
|
|
/* -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_DIV2;
|
|
RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
|
|
if(HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_3) != HAL_OK)
|
|
{
|
|
Error_Handler();
|
|
}
|
|
|
|
/* -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();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @brief System Clock Configuration
|
|
* The system Clock is configured as follow :
|
|
* System Clock source = PLL (HSI)
|
|
* SYSCLK(Hz) = 100000000
|
|
* HCLK(Hz) = 100000000
|
|
* AHB Prescaler = 1
|
|
* APB1 Prescaler = 2
|
|
* APB2 Prescaler = 1
|
|
* HSI Frequency(Hz) = 16000000
|
|
* PLL_M = 16
|
|
* PLL_N = 400
|
|
* PLL_P = 4
|
|
* PLL_Q = 7
|
|
* VDD(V) = 3.3
|
|
* Main regulator output voltage = Scale1 mode
|
|
* Flash Latency(WS) = 3
|
|
* @param None
|
|
* @retval None
|
|
*/
|
|
void SystemClockHSI_Config(void)
|
|
{
|
|
RCC_ClkInitTypeDef RCC_ClkInitStruct;
|
|
RCC_OscInitTypeDef RCC_OscInitStruct;
|
|
|
|
/* 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);
|
|
|
|
/* -1- Select HSE 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_3) != HAL_OK)
|
|
{
|
|
Error_Handler();
|
|
}
|
|
|
|
/* -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 = 0x10;
|
|
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
|
|
RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI;
|
|
RCC_OscInitStruct.PLL.PLLM = 16;
|
|
RCC_OscInitStruct.PLL.PLLN = 400;
|
|
RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV4;
|
|
RCC_OscInitStruct.PLL.PLLQ = 7;
|
|
if(HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
|
|
{
|
|
/* Initialization Error */
|
|
Error_Handler();
|
|
}
|
|
|
|
/* -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_DIV2;
|
|
RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
|
|
if(HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_3) != HAL_OK)
|
|
{
|
|
Error_Handler();
|
|
}
|
|
|
|
/* -4- Optional: Disable HSE Oscillator (if the HSE 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();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @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)
|
|
{
|
|
}
|
|
}
|
|
|
|
#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)
|
|
{
|
|
}
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* @}
|
|
*/
|
|
|
|
/**
|
|
* @}
|
|
*/
|