main.c

/* USER CODE BEGIN Header */
/**
  ******************************************************************************
  * @file    Examples_LL/UTILS/UTILS_ConfigureSystemClock/Src/main.c
  * @author  MCD Application Team
  * @brief   This example describes how to configure system clock using PLL with
  *          HSI as source clock through the STM32G4xx UTILS LL API.
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; Copyright (c) 2019 STMicroelectronics.
  * All rights reserved.</center></h2>
  *
  * This software component is licensed by ST under BSD 3-Clause license,
  * the "License"; You may not use this file except in compliance with the
  * License. You may obtain a copy of the License at:
  *                        opensource.org/licenses/BSD-3-Clause
  *
  ******************************************************************************
  */
/* 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 */
/* Variable to store PLL parameters */
/* Configuration will allow to reach a SYSCLK frequency set to 170MHz:
   Syst freq = ((HSI_VALUE / PLLM) * PLLN)/ PLLP)
               ((16MHz /4) * 85)/ 2)             = 170MHz             */
LL_UTILS_PLLInitTypeDef sUTILS_PLLInitStruct = {LL_RCC_PLLM_DIV_4, 85, LL_RCC_PLLP_DIV_2};


/* Variable to store AHB and APB buses clock configuration */
/* Settings to have HCLK set to 170MHz, APB1 to 42.5MHz and APB2 to 85MHz */
LL_UTILS_ClkInitTypeDef sUTILS_ClkInitStruct = {LL_RCC_SYSCLK_DIV_1, LL_RCC_APB1_DIV_4, LL_RCC_APB2_DIV_2};


/* USER CODE END PV */

/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
/* USER CODE BEGIN PFP */
void     LED_Init(void);
void     MCO_ConfigGPIO(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 */

  /* USER CODE END 1 */


  /* MCU Configuration--------------------------------------------------------*/

  /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
  

  LL_APB2_GRP1_EnableClock(LL_APB2_GRP1_PERIPH_SYSCFG);
  LL_APB1_GRP1_EnableClock(LL_APB1_GRP1_PERIPH_PWR);

  NVIC_SetPriorityGrouping(NVIC_PRIORITYGROUP_4);

  /* System interrupt init*/

  /** Disable the internal Pull-Up in Dead Battery pins of UCPD peripheral 
  */
  LL_PWR_DisableDeadBatteryPD();

  /* USER CODE BEGIN Init */
  /* System started with default clock used after reset */
  /* USER CODE END Init */

  /* Configure the system clock */
  SystemClock_Config();

  /* USER CODE BEGIN SysInit */

  /* USER CODE END SysInit */

  /* Initialize all configured peripherals */
  /* USER CODE BEGIN 2 */

  /* Switch to PLL with HSI as clock source             */
  /*****************************************************************/
  /* Save the ErrorStatus returned by LL_PLL_ConfigSystemClock_HSI */
  /*****************************************************************/
  ErrorStatus status = LL_PLL_ConfigSystemClock_HSI(&sUTILS_PLLInitStruct, &sUTILS_ClkInitStruct);

  /*
     CMSIS variable automatically updated according to new configuration.
     SystemCoreClock should be equal to calculated HCLK frequency.
     FLASH latency is also tuned according to system constraints described
     in the reference manual.
  */

  /* Set Systick to 1ms in using frequency set to SystemCoreClock */
  LL_Init1msTick(SystemCoreClock);

  /* Initialize LED2 */
  LED_Init();

  /************************************************************************/
  /* If LL_PLL_ConfigSystemClock_HSI returned ERROR, blink the on board   */
  /* LED at a frequency of 5Hz. LL_PLL_ConfigSystemClock_HSI does actully */
  /* return ERROR so the LED will blink at 5Hz                            */
  /************************************************************************/
  if (status == ERROR)
  {
    while (1)
    {
      LL_GPIO_TogglePin(LED2_GPIO_PORT, LED2_PIN);
      LL_mDelay(100);
    }
  }

  /* Configure SYSCLK for MCO */
  MCO_ConfigGPIO();
  /* USER CODE END 2 */

  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
  {
    LL_GPIO_TogglePin(LED2_GPIO_PORT, LED2_PIN);
    LL_mDelay(1000);

    /* USER CODE END WHILE */

    /* USER CODE BEGIN 3 */
  }
  /* USER CODE END 3 */
}

/**
  * @brief System Clock Configuration
  * @retval None
  */
void SystemClock_Config(void)
{
  LL_FLASH_SetLatency(LL_FLASH_LATENCY_8);
  LL_PWR_EnableRange1BoostMode();
  LL_RCC_HSI_Enable();

   /* Wait till HSI is ready */
  while(LL_RCC_HSI_IsReady() != 1)
  {
    
  }
  LL_RCC_HSI_SetCalibTrimming(64);
  LL_RCC_PLL_ConfigDomain_SYS(LL_RCC_PLLSOURCE_HSI, LL_RCC_PLLM_DIV_4, 85, LL_RCC_PLLR_DIV_2);
  LL_RCC_PLL_EnableDomain_SYS();
  LL_RCC_PLL_Enable();

   /* Wait till PLL is ready */
  while(LL_RCC_PLL_IsReady() != 1)
  {
    
  }
  LL_RCC_SetSysClkSource(LL_RCC_SYS_CLKSOURCE_PLL);
  LL_RCC_SetAHBPrescaler(LL_RCC_SYSCLK_DIV_2);

   /* Wait till System clock is ready */
  while(LL_RCC_GetSysClkSource() != LL_RCC_SYS_CLKSOURCE_STATUS_PLL)
  {
  
  }
  /* Insure 1µs transition state at intermediate medium speed clock based on DWT */
  CoreDebug->DEMCR |= CoreDebug_DEMCR_TRCENA_Msk;
  DWT->CTRL |= DWT_CTRL_CYCCNTENA_Msk;
  DWT->CYCCNT = 0;
  while(DWT->CYCCNT < 100);
  /* Set AHB prescaler*/
  LL_RCC_SetAHBPrescaler(LL_RCC_SYSCLK_DIV_1);
  LL_RCC_SetAPB1Prescaler(LL_RCC_APB1_DIV_1);
  LL_RCC_SetAPB2Prescaler(LL_RCC_APB1_DIV_1);

  LL_Init1msTick(170000000);

  LL_SetSystemCoreClock(170000000);
}

/* USER CODE BEGIN 4 */

/**
  * @brief  Initialize LED2.
  * @param  None
  * @retval None
  */
void LED_Init(void)
{
  /* Enable the LED2 Clock */
  LED2_GPIO_CLK_ENABLE();

  /* Configure IO in output push-pull mode to drive external LED2 */
  LL_GPIO_SetPinMode(LED2_GPIO_PORT, LED2_PIN, LL_GPIO_MODE_OUTPUT);
  /* Reset value is LL_GPIO_OUTPUT_PUSHPULL */
  //LL_GPIO_SetPinOutputType(LED2_GPIO_PORT, LED2_PIN, LL_GPIO_OUTPUT_PUSHPULL);
  /* Reset value is LL_GPIO_SPEED_FREQ_LOW */
  //LL_GPIO_SetPinSpeed(LED2_GPIO_PORT, LED2_PIN, LL_GPIO_SPEED_FREQ_LOW);
  /* Reset value is LL_GPIO_PULL_NO */
  //LL_GPIO_SetPinPull(LED2_GPIO_PORT, LED2_PIN, LL_GPIO_PULL_NO);

  /* Select MCO clock source and prescaler */
  LL_RCC_ConfigMCO(LL_RCC_MCO1SOURCE_SYSCLK, LL_RCC_MCO1_DIV_1);
}

/**
  * @brief  Configure MCO pin (PA8).
  * @param  None
  * @retval None
  */
void MCO_ConfigGPIO(void)
{
  /* MCO Clock Enable */
  LL_AHB2_GRP1_EnableClock(LL_AHB2_GRP1_PERIPH_GPIOA);

  /* Configure the MCO pin in alternate function mode */
  LL_GPIO_SetPinMode(GPIOA, LL_GPIO_PIN_8, LL_GPIO_MODE_ALTERNATE);
  LL_GPIO_SetPinOutputType(GPIOA, LL_GPIO_PIN_8, LL_GPIO_OUTPUT_PUSHPULL);
  LL_GPIO_SetPinSpeed(GPIOA, LL_GPIO_PIN_8, LL_GPIO_SPEED_FREQ_VERY_HIGH);
  LL_GPIO_SetPinPull(GPIOA, LL_GPIO_PIN_8, LL_GPIO_PULL_NO);
  LL_GPIO_SetAFPin_8_15(GPIOA, LL_GPIO_PIN_8, LL_GPIO_AF_0);
}

/* 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 */
  /* User can add his own implementation to report the HAL error return state */

  /* 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", file, line) */

  /* Infinite loop */
  while (1)
  {
  }
  /* USER CODE END 6 */
}
#endif /* USE_FULL_ASSERT */

/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/