STM32CubeF0/Projects/STM32F072RB-Nucleo/Examples/PWR/PWR_PVD/Src/main.c

/**
  ******************************************************************************
  * @file    PWR/PWR_PVD/Src/main.c
  * @author  MCD Application Team
  * @brief   This sample code shows how to use STM32F0xx PWR HAL API to manage the
  *          Programmable Voltage Detector (PVD).
  ******************************************************************************
  * @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 STM32F0xx_HAL_Examples
  * @{
  */

/** @addtogroup PWR_PVD
  * @{
  */

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
PWR_PVDTypeDef sConfigPVD;
__IO uint32_t uwToggleOn = 1;

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

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

/**
  * @brief  Main program
  * @param  None
  * @retval None
  */
int main(void)
{
  /* STM32F0xx 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.
       - Low Level Initialization
     */
  HAL_Init();

  /* Configure LED */
  BSP_LED_Init(LED2); 

  /* Configure the system clock to 48 MHz */
  SystemClock_Config();

  /* Configure the PVD */
  PVD_Config();

  /* Infinite loop */ 
  while (1)
  {
    /* LED2 toggles when the voltage is above the target threshold */
    if (uwToggleOn)
    {
      BSP_LED_Toggle(LED2); 
      HAL_Delay(200);
    }
  }
}

/**
  * @brief  Configures the PVD resources.
  * @param  None
  * @retval None
  */
static void PVD_Config(void)
{
  /*##-1- Enable Power Clock #################################################*/
  __HAL_RCC_PWR_CLK_ENABLE();

  /*##-2- Configure the NVIC for PVD #########################################*/
  HAL_NVIC_SetPriority(PVD_VDDIO2_IRQn, 0, 0);
  HAL_NVIC_EnableIRQ(PVD_VDDIO2_IRQn);

  /* Configure the PVD Level to 3 and generate an interrupt on rising and falling
     edges(PVD detection level set to 2.5V, refer to the electrical characteristics
     of you device datasheet for more details) */
  sConfigPVD.PVDLevel = PWR_PVDLEVEL_3;
  sConfigPVD.Mode = PWR_PVD_MODE_IT_RISING_FALLING;
  HAL_PWR_ConfigPVD(&sConfigPVD);

  /* Enable the PVD Output */
  HAL_PWR_EnablePVD();
}

/**
  * @brief  System Clock Configuration
  *         The system Clock is configured as follow : 
  *            System Clock source            = PLL (HSI48)
  *            SYSCLK(Hz)                     = 48000000
  *            HCLK(Hz)                       = 48000000
  *            AHB Prescaler                  = 1
  *            APB1 Prescaler                 = 1
  *            HSI Frequency(Hz)              = 48000000
  *            PREDIV                         = 2
  *            PLLMUL                         = 2
  *            Flash Latency(WS)              = 1
  * @param  None
  * @retval None
  */
static void SystemClock_Config(void)
{
  RCC_ClkInitTypeDef RCC_ClkInitStruct;
  RCC_OscInitTypeDef RCC_OscInitStruct;
  
  /* Select HSI48 Oscillator as PLL source */
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI48;
  RCC_OscInitStruct.HSI48State = RCC_HSI48_ON;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI48;
  RCC_OscInitStruct.PLL.PREDIV = RCC_PREDIV_DIV2;
  RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL2;
  if (HAL_RCC_OscConfig(&RCC_OscInitStruct)!= HAL_OK)
  {
    Error_Handler();
  }

  /* Select PLL as system clock source and configure the HCLK and PCLK1 clocks dividers */
  RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1);
  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_1)!= HAL_OK)
  {
    Error_Handler();
  }
}



/**
  * @brief  This function is executed in case of error occurrence.
  * @param  None
  * @retval None
  */
static void Error_Handler(void)
{
  /* Error if LED2 is slowling blinking (1 sec. period)  */
  BSP_LED_On(LED2);
  while (1)
  {
    BSP_LED_Toggle(LED2); 
    HAL_Delay(1000);
  }
}

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

/**
  * @brief  PWR PVD interrupt callback
  * @param  none 
  * @retval none
  */
void HAL_PWR_PVDCallback(void)
{
  /* Set LED2 on */  
  BSP_LED_On(LED2); 
  /* update uwToggleOn global variable so that LED2 blinks when the
     voltage is above the target threshold */
  uwToggleOn = (uwToggleOn+1) % 2;
}

#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) */
  Error_Handler();

  /* Infinite loop */
  while (1)
  {
  }
}
#endif

/**
  * @}
  */

/**
  * @}
  */

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