STM32CubeF1/Projects/STM32F103RB-Nucleo/Examples/PWR/PWR_STANDBY/Src/main.c

/**
  ******************************************************************************
  * @file    PWR/PWR_STANDBY/Src/main.c
  * @author  MCD Application Team
  * @brief   This sample code shows how to use STM32F1xx PWR HAL API to enter
  *          and exit the standby mode with a wakeup pin or external reset.
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; Copyright (c) 2016 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
  *
  ******************************************************************************
  */

/* Includes ------------------------------------------------------------------*/
#include "main.h"

/** @addtogroup STM32F1xx_HAL_Examples
  * @{
  */

/** @addtogroup PWR_STANDBY
  * @{
  */

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
static __IO uint32_t TimingDelay;

void SystemClock_Config(void);
/* Private function prototypes -----------------------------------------------*/
static void SystemPower_Config(void);

/* Private functions ---------------------------------------------------------*/

/**
  * @brief  Main program
  * @param  None
  * @retval None
  */
int main(void)
{
  /* STM32F103xB HAL library initialization:
       - Configure the Flash prefetch
       - Systick timer is configured by default as source of time base, but user 
         can eventually implement his proper time base source (a general purpose 
         timer for example or other time source), keeping in mind that Time base 
         duration should be kept 1ms since PPP_TIMEOUT_VALUEs are defined and 
         handled in milliseconds basis.
       - Set NVIC Group Priority to 4
       - Low Level Initialization
     */
  HAL_Init();

  /* Configure the system clock to 64 MHz */
  SystemClock_Config();

  /* Configure the system Power */
  SystemPower_Config();
  
  /* Check and handle if the system was resumed from Standby mode */ 
  if (__HAL_PWR_GET_FLAG(PWR_FLAG_SB) != RESET)
  {
    /* Clear Standby flag */
    __HAL_PWR_CLEAR_FLAG(PWR_FLAG_SB);
  }

  /* Insert 5 seconds delay */
  HAL_Delay(5000);

 /* The Following Wakeup sequence is highly recommended prior to each Standby mode entry
    mainly when using more than one wakeup source this is to not miss any wakeup event.
     - Disable all used wakeup sources,
     - Clear all related wakeup flags, 
     - Re-enable all used wakeup sources,
     - Enter the Standby mode.
  */

  /* Disable all used wakeup sources: PWR_WAKEUP_PIN1 */
  HAL_PWR_DisableWakeUpPin(PWR_WAKEUP_PIN1);

  /* Clear all related wakeup flags*/
  __HAL_PWR_CLEAR_FLAG(PWR_FLAG_WU);
  
  /* Enable WakeUp Pin PWR_WAKEUP_PIN1 connected to PA.00 */
  HAL_PWR_EnableWakeUpPin(PWR_WAKEUP_PIN1);

  /* Enter the Standby mode */
  HAL_PWR_EnterSTANDBYMode();

  /* This code will never be reached! */
  while (1)
  {
  }
}

/**
  * @brief  System Clock Configuration
  *         The system Clock is configured as follow : 
  *            System Clock source            = PLL (HSI)
  *            SYSCLK(Hz)                     = 64000000
  *            HCLK(Hz)                       = 64000000
  *            AHB Prescaler                  = 1
  *            APB1 Prescaler                 = 2
  *            APB2 Prescaler                 = 1
  *            PLLMUL                         = 16
  *            Flash Latency(WS)              = 2
  * @param  None
  * @retval None
  */
void SystemClock_Config(void)
{
  RCC_ClkInitTypeDef clkinitstruct = {0};
  RCC_OscInitTypeDef oscinitstruct = {0};
  
  /* Configure PLL ------------------------------------------------------*/
  /* PLL configuration: PLLCLK = (HSI / 2) * PLLMUL = (8 / 2) * 16 = 64 MHz */
  /* PREDIV1 configuration: PREDIV1CLK = PLLCLK / HSEPredivValue = 64 / 1 = 64 MHz */
  /* Enable HSI and activate PLL with HSi_DIV2 as source */
  oscinitstruct.OscillatorType  = RCC_OSCILLATORTYPE_HSI;
  oscinitstruct.HSEState        = RCC_HSE_OFF;
  oscinitstruct.LSEState        = RCC_LSE_OFF;
  oscinitstruct.HSIState        = RCC_HSI_ON;
  oscinitstruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
  oscinitstruct.HSEPredivValue    = RCC_HSE_PREDIV_DIV1;
  oscinitstruct.PLL.PLLState    = RCC_PLL_ON;
  oscinitstruct.PLL.PLLSource   = RCC_PLLSOURCE_HSI_DIV2;
  oscinitstruct.PLL.PLLMUL      = RCC_PLL_MUL16;
  if (HAL_RCC_OscConfig(&oscinitstruct)!= HAL_OK)
  {
    /* Initialization Error */
    while(1); 
  }

  /* Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2 
     clocks dividers */
  clkinitstruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
  clkinitstruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
  clkinitstruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
  clkinitstruct.APB2CLKDivider = RCC_HCLK_DIV1;
  clkinitstruct.APB1CLKDivider = RCC_HCLK_DIV2;  
  if (HAL_RCC_ClockConfig(&clkinitstruct, FLASH_LATENCY_2)!= HAL_OK)
  {
    /* Initialization Error */
    while(1); 
  }
}

/**
  * @brief  System Power Configuration
  *         The system Power is configured as follow : 
  *            + VREFINT OFF, with fast wakeup enabled
  *            + No IWDG
  *            + Wakeup using PWR_WAKEUP_PIN1
  * @param None
  * @retval None
  */
static void SystemPower_Config(void)
{
  /* Enable Power Control clock */
  __HAL_RCC_PWR_CLK_ENABLE();
}

/**
  * @brief SYSTICK callback
  * @param None
  * @retval None
  */
void HAL_SYSTICK_Callback(void)
{
  HAL_IncTick();
}
    

#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

/**
  * @}
  */

/**
  * @}
  */

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