STM32CubeF1/Projects/STM32VL-Discovery/Examples/HAL/HAL_TimeBase_TIM/Src/main.c

/**
  ******************************************************************************
  * @file    HAL/HAL_TimeBase_TIM/Src/main.c 
  * @author  MCD Application Team
  * @brief   This example describes how to configure HAL time base using
  *          the STM32F1xx HAL API.
  ******************************************************************************
  * @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 STM32F1xx_HAL_Examples
  * @{
  */

/** @addtogroup HAL_TimeBase_TIM
  * @{
  */ 

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
uint32_t uwIncrementState = 0;
/* Private function prototypes -----------------------------------------------*/
static void SystemClock_Config(void);

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

/**
  * @brief  Main program
  * @param  None
  * @retval None
  */
int main(void)
{
 /* This sample code shows how to configure The HAL time base source base with a 
    dedicated  Tick interrupt priority.
    A general purpose timer (TIM2) is used instead of Systick as source of time base.  
    Time base duration is fixed to 1ms since PPP_TIMEOUT_VALUEs are defined and 
    handled in milliseconds basis.
    */

  /* STM32F1xx HAL library initialization:
       - Configure the Flash prefetch
       - Configure timer (TIM2) to generate an interrupt each 1 msec
       - Set NVIC Group Priority to 4
       - Low Level Initialization
     */
  HAL_Init();
  
  /* Configure the system clock to 24 MHz */
  SystemClock_Config();
  
  /* Configure LED3 */
  BSP_LED_Init(LED3);
  
  /* Configure User push-button */
  BSP_PB_Init(BUTTON_USER, BUTTON_MODE_EXTI);

  /* Insert a Delay of 1000 ms and toggle LED3, in an infinite loop */  
  while (1)
  {
    /* Insert a 1s delay */
    HAL_Delay(1000);
    
    /* Toggle LED3 */
    BSP_LED_Toggle(LED3);
    
  }
}

/**
  * @brief EXTI line detection callback.
  * @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)
  {
    if (uwIncrementState == 0)
    {
      /* Suspend tick increment */
      HAL_SuspendTick();
      
      /* Change the Push button state */
      uwIncrementState = 1;
    }
    else
    {
      /* Resume tick increment */
      HAL_ResumeTick();
      
      /* Change the Push button state */
      uwIncrementState = 0;
    }
  }  
}

/**
  * @brief  System Clock Configuration
  *         The system Clock is configured as follow : 
  *            System Clock source            = PLL (HSE)
  *            SYSCLK(Hz)                     = 24000000
  *            HCLK(Hz)                       = 24000000
  *            AHB Prescaler                  = 1
  *            APB1 Prescaler                 = 1
  *            APB2 Prescaler                 = 1
  *            HSE Frequency(Hz)              = 8000000
  *            HSE PREDIV1                    = 2
  *            PLLMUL                         = 6
  *            Flash Latency(WS)              = 0
  * @param  None
  * @retval None
  */
void SystemClock_Config(void)
{
  RCC_ClkInitTypeDef clkinitstruct = {0};
  RCC_OscInitTypeDef oscinitstruct = {0};
  
  /* Enable HSE Oscillator and activate PLL with HSE as source */
  oscinitstruct.OscillatorType  = RCC_OSCILLATORTYPE_HSE;
  oscinitstruct.HSEState        = RCC_HSE_ON;
  oscinitstruct.HSEPredivValue  = RCC_HSE_PREDIV_DIV2;
  oscinitstruct.PLL.PLLState    = RCC_PLL_ON;
  oscinitstruct.PLL.PLLSource   = RCC_PLLSOURCE_HSE;
  oscinitstruct.PLL.PLLMUL      = RCC_PLL_MUL6;
  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_DIV1;  
  if (HAL_RCC_ClockConfig(&clkinitstruct, FLASH_LATENCY_0)!= HAL_OK)
  {
    /* Initialization Error */
    while(1); 
  }
}

#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

/**
  * @}
  */ 

/**
  * @}
  */