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/* USER CODE BEGIN Header */
/**
******************************************************************************
* @file RCC/RCC_CRS_Synchronization_Polling/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) 2019-2021 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.
*
******************************************************************************
*/
/* USER CODE END Header */
/* Includes ------------------------------------------------------------------*/
#include "main.h"
/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
/* USER CODE END Includes */
/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */
/* USER CODE END PTD */
/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */
/* USER CODE END PD */
/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */
/* USER CODE END PM */
/* Private variables ---------------------------------------------------------*/
/* USER CODE BEGIN PV */
/* USER CODE END PV */
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
/* USER CODE BEGIN PFP */
static void CRS_Init(void);
/* USER CODE END PFP */
/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */
/* USER CODE END 0 */
/**
* @brief The application entry point.
* @retval int
*/
int main(void)
{
/* USER CODE BEGIN 1 */
uint32_t status = RCC_CRS_TIMEOUT;
RCC_CRSSynchroInfoTypeDef syncinfo = {0};
RCC_CRSInitTypeDef crsinitstruct = {0};
/* USER CODE END 1 */
/* MCU Configuration--------------------------------------------------------*/
/* Reset of all peripherals, Initializes the Flash interface and the Systick. */
HAL_Init();
/* USER CODE BEGIN Init */
/* USER CODE END Init */
/* Configure the system clock */
SystemClock_Config();
/* USER CODE BEGIN SysInit */
/* USER CODE END SysInit */
/* Initialize all configured peripherals */
MX_GPIO_Init();
/* USER CODE BEGIN 2 */
/* Configure LED2 and LED3 */
BSP_LED_Init(LED2);
BSP_LED_Init(LED3);
/* CRS initialization (enable HSI48 and LSE oscillators and then enable CRS clock */
CRS_Init();
/* HSI48 Synchronization with LSE frequency */
crsinitstruct.Prescaler = RCC_CRS_SYNC_DIV1;
crsinitstruct.Source = RCC_CRS_SYNC_SOURCE_LSE;
crsinitstruct.Polarity = RCC_CRS_SYNC_POLARITY_FALLING;
/* F(LSE)=32.768kHz then Reload=(f(Target)/f(LSE))-1= 0x5B7*/
crsinitstruct.ReloadValue = __HAL_RCC_CRS_RELOADVALUE_CALCULATE(HSI48_VALUE, LSE_VALUE);
/* Felim value calculated like this FELIM = (fTARGET / fSYNC) * STEP[%] / 100% / 2 with STEP=0.14% then FELIM = 2 */
crsinitstruct.ErrorLimitValue = 2;
/* Change the HSI trimming value to see the automatic calibration performed by CRS */
crsinitstruct.HSI48CalibrationValue = 0x00;
/* Start automatic synchronization using polling mode */
HAL_RCCEx_CRSConfig(&crsinitstruct);
/* Wait for synchronization OK event */
do
{
/* Check status of CRS synchronization */
/* Timeout is based on F(LSE) then less than 1 ms*/
status = HAL_RCCEx_CRSWaitSynchronization(1);
if ((status & RCC_CRS_TIMEOUT) == RCC_CRS_TIMEOUT)
{
/* Timeout issue. May have a problem with synchronization frequency */
Error_Handler();
}
/* Adapt synchronization input parameters in case of SYNC error or SYNC miss event */
if (((status & RCC_CRS_SYNCERR) == RCC_CRS_SYNCERR) || ((status & RCC_CRS_SYNCMISS) == RCC_CRS_SYNCMISS))
{
HAL_RCCEx_CRSGetSynchronizationInfo(&syncinfo);
/* User can check different parameters returned in synchronization info structure*/
/* and restart a new synchronization in changing input parameters */
HAL_RCCEx_CRSConfig(&crsinitstruct);
}
}
while ((status & RCC_CRS_SYNCOK) != RCC_CRS_SYNCOK);
/* Power on LED2 */
BSP_LED_On(LED2);
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
}
/* USER CODE END 3 */
}
/**
* @brief System Clock Configuration
* @retval None
*/
void SystemClock_Config(void)
{
RCC_OscInitTypeDef RCC_OscInitStruct = {0};
RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
/** Configure the main internal regulator output voltage
*/
__HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
/** Initializes the RCC Oscillators according to the specified parameters
* in the RCC_OscInitTypeDef structure.
*/
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_MSI;
RCC_OscInitStruct.MSIState = RCC_MSI_ON;
RCC_OscInitStruct.MSICalibrationValue = RCC_MSICALIBRATION_DEFAULT;
RCC_OscInitStruct.MSIClockRange = RCC_MSIRANGE_6;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_MSI;
RCC_OscInitStruct.PLL.PLLM = RCC_PLLM_DIV1;
RCC_OscInitStruct.PLL.PLLN = 32;
RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV5;
RCC_OscInitStruct.PLL.PLLR = RCC_PLLR_DIV2;
RCC_OscInitStruct.PLL.PLLQ = RCC_PLLQ_DIV4;
if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
{
Error_Handler();
}
/** Configure the SYSCLKSource, HCLK, PCLK1 and PCLK2 clocks dividers
*/
RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK4|RCC_CLOCKTYPE_HCLK2
|RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
|RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
RCC_ClkInitStruct.AHBCLK2Divider = RCC_SYSCLK_DIV2;
RCC_ClkInitStruct.AHBCLK4Divider = RCC_SYSCLK_DIV1;
if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_3) != HAL_OK)
{
Error_Handler();
}
}
/**
* @brief GPIO Initialization Function
* @param None
* @retval None
*/
static void MX_GPIO_Init(void)
{
GPIO_InitTypeDef GPIO_InitStruct = {0};
/* GPIO Ports Clock Enable */
__HAL_RCC_GPIOA_CLK_ENABLE();
/*Configure GPIO pin : PA8 */
GPIO_InitStruct.Pin = GPIO_PIN_8;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
GPIO_InitStruct.Alternate = GPIO_AF0_MCO;
HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
}
/* USER CODE BEGIN 4 */
/**
* @brief This function initializes the clock configuration for CRS.
* @param None
* @retval None
*/
static void CRS_Init(void)
{
RCC_OscInitTypeDef RCC_OscInitStruct = {0};
HAL_RCC_GetOscConfig(&RCC_OscInitStruct);
if (RCC_OscInitStruct.HSI48State != RCC_HSI48_ON)
{
/* Enable HSI48 and LSE Oscillator*/
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI48 | RCC_OSCILLATORTYPE_LSE;
RCC_OscInitStruct.HSI48State = RCC_HSI48_ON;
RCC_OscInitStruct.LSEState = RCC_LSE_ON;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
{
Error_Handler();
}
}
/* Enable CRS clock*/
__HAL_RCC_CRS_CLK_ENABLE();
/* Output HSI48 MCO pin(PA8) */
HAL_RCC_MCOConfig(RCC_MCO1, RCC_MCO1SOURCE_HSI48, RCC_MCODIV_1);
}
/* USER CODE END 4 */
/**
* @brief This function is executed in case of error occurrence.
* @retval None
*/
void Error_Handler(void)
{
/* USER CODE BEGIN Error_Handler_Debug */
/* Turn LED3 on */
BSP_LED_On(LED3);
while (1)
{
}
/* USER CODE END Error_Handler_Debug */
}
#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 CODE BEGIN 6 */
/* 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)
{
}
/* USER CODE END 6 */
}
#endif /* USE_FULL_ASSERT */
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