/**
  ******************************************************************************
  * @file    PWR/PWR_STANDBY/Src/main.c
  * @author  MCD Application Team
  * @brief   This sample code shows how to use STM32F3xx 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 STM32F3xx_HAL_Examples
  * @{
  */

/** @addtogroup PWR_STANDBY
  * @{
  */

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
#define LED_TOGGLE_DELAY         100
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
static __IO uint32_t TimingDelay;
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);

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

/**
  * @brief  Main program
  * @param  None
  * @retval None
  */
int main(void)
{
  /* STM32F3xx HAL library initialization:
       - Configure the Flash prefetch
       - Configure the Systick to generate an interrupt each 1 msec
       - Set NVIC Group Priority to 4
       - Low Level Initialization
     */
  HAL_Init();

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

  /* Configure LED1, LED2 */
  BSP_LED_Init(LED1);
  BSP_LED_Init(LED2);

  /* Enable Power Clock */
  __HAL_RCC_PWR_CLK_ENABLE();
  
  /* Check 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);
      
    /* Wait that user release the User push-button */
    BSP_PB_Init(BUTTON_USER, BUTTON_MODE_GPIO);
    while(BSP_PB_GetState(BUTTON_USER) == GPIO_PIN_RESET){}
  }


  /* 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_PIN2 */
  HAL_PWR_DisableWakeUpPin(PWR_WAKEUP_PIN2);

  /* Clear all related wakeup flags*/
  __HAL_PWR_CLEAR_FLAG(PWR_FLAG_WU);
  
  /* Enable WakeUp Pin PWR_WAKEUP_PIN2 connected to PC.13 */
  HAL_PWR_EnableWakeUpPin(PWR_WAKEUP_PIN2);

  /* 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
  *            HSI Frequency(Hz)              = 8000000
  *            PREDIV                         = RCC_PREDIV_DIV2 (2)
  *            PLLMUL                         = RCC_PLL_MUL16 (16)
  *            Flash Latency(WS)              = 2
  * @param  None
  * @retval None
  */
void SystemClock_Config(void)
{
  RCC_ClkInitTypeDef RCC_ClkInitStruct;
  RCC_OscInitTypeDef RCC_OscInitStruct;
  
  /* HSI Oscillator already ON after system reset, activate PLL with HSI as source */
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_NONE;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI;
  RCC_OscInitStruct.PLL.PREDIV = RCC_PREDIV_DIV2;
  RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL16;
  RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
  if (HAL_RCC_OscConfig(&RCC_OscInitStruct)!= HAL_OK)
  {
    /* Initialization Error */
    while(1); 
  }

  /* Select 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_2)!= HAL_OK)
  {
    /* Initialization Error */
    while(1); 
  }
}

/**
  * @brief  This function is executed in case of error occurrence.
  * @param  None
  * @retval None
  */
void Error_Handler(void)
{
  /* Turn LED2 on */
  BSP_LED_On(LED2);
  while (1)
  {
  }
}


/**
  * @brief SYSTICK callback
  * @param None
  * @retval None
  */
void HAL_SYSTICK_Callback(void)
{
  HAL_IncTick();
  if (TimingDelay != 0)
  {
    TimingDelay--;
}
  else
  {
    /* Toggle LED1 */
    BSP_LED_Toggle(LED1);
    TimingDelay = LED_TOGGLE_DELAY;
  }
}

/**
  * @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 == USER_BUTTON_PIN)
  {    
    /* Wait that user release the User push-button */
    while(BSP_PB_GetState(BUTTON_USER) == GPIO_PIN_RESET){}
    
    /* Disable all used wakeup sources: WKUP pin */
    HAL_PWR_DisableWakeUpPin(PWR_WAKEUP_PIN2);
    

    /* Enable WKUP pin */
    HAL_PWR_EnableWakeUpPin(PWR_WAKEUP_PIN2);
 
    __HAL_PWR_CLEAR_FLAG(PWR_FLAG_WU);
    
    /* Request to enter STANDBY mode */
    HAL_PWR_EnterSTANDBYMode();
  }
}

#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****/