STM32CubeF0/Projects/STM32F091RC-Nucleo/Examples/COMP/COMP_Interrupt/Src/main.c

/**
  ******************************************************************************
  * @file    COMP/COMP_Interrupt/Src/main.c
  * @author  MCD Application Team
  * @brief   This example provides a short description of how to use the COMP 
  *          peripheral Interrupt.
  ******************************************************************************
  * @attention
  *
  * Copyright (c) 2016 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.
  *
  ******************************************************************************
  */

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

/** @addtogroup STM32F0xx_HAL_Examples
  * @{
  */

/** @addtogroup COMP_Interrupt
  * @{
  */

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
COMP_HandleTypeDef  hcomp1;

/* Private function prototypes -----------------------------------------------*/
static void SystemClock_Config(void);
static void Error_Handler(void);
static void COMP_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 LED2 */
  BSP_LED_Init(LED2);

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

  /* Configure COMP */
  COMP_Config();
  
  /* Infinite loop */
  while (1)
  {
  }
}

static void COMP_Config(void)
{
  /*##-1- Configure the COMP peripheral ######################################*/  
  hcomp1.Instance = COMP1;
  
  hcomp1.Init.InvertingInput  = COMP_INVERTINGINPUT_VREFINT;
  hcomp1.Init.Output          = COMP_OUTPUT_NONE;
  hcomp1.Init.OutputPol       = COMP_OUTPUTPOL_NONINVERTED;
  hcomp1.Init.Mode            = COMP_MODE_LOWPOWER;
  hcomp1.Init.Hysteresis      = COMP_HYSTERESIS_NONE;
  hcomp1.Init.WindowMode      = COMP_WINDOWMODE_DISABLE;
  hcomp1.Init.TriggerMode     = COMP_TRIGGERMODE_IT_RISING_FALLING;

  if(HAL_COMP_Init(&hcomp1) != HAL_OK)
  {
    /* Initialization Error */
    Error_Handler();
  }

  /*##-2- Start the COMP1 and enable the interrupt ###########################*/  
  if(HAL_COMP_Start_IT(&hcomp1) != HAL_OK)
  {
    /* Initialization Error */
    Error_Handler();
  }
}

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

/**
  * @brief  COMP1 interrupt callback
  * @param  hcomp : COMP handle 
  * @retval none
  */
void HAL_COMP_TriggerCallback(COMP_HandleTypeDef *hcomp)
{
  /* Turn On LED2 */
  BSP_LED_Toggle(LED2);
}

/**
  * @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)
{

  while (1)
  {
    /* Toggle LED2 */
    BSP_LED_Toggle(LED2);
      
    /* Add a delay */
    HAL_Delay(100);
  }
}

#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

/**
  * @}
  */

/**
  * @}
  */