演示了如何使用定时器中断以LED的形式展现实验

#include "main.h"

#include "stm32f1xx_hal.h"



TIM_HandleTypeDef htim2;



void SystemClock_Config(void);

static void MX_GPIO_Init(void);

static void MX_TIM2_Init(void);



int main(void)

{

  HAL_Init();

  SystemClock_Config();

  MX_GPIO_Init();

  MX_TIM2_Init();



  HAL_TIM_Base_Start_IT(&htim2);



  while (1)

  {

    // 主循环中可以执行其他任务

  }

}



void SystemClock_Config(void)

{

  RCC_OscInitTypeDef RCC_OscInitStruct = {0};

  RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};



  __HAL_RCC_PWR_CLK_ENABLE();

  __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);



  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;

  RCC_OscInitStruct.HSEState = RCC_HSE_ON;

  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;

  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;

  RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL9;

  if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)

  {

    Error_Handler();

  }



  RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_SYSCLK | 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)

  {

    Error_Handler();

  }

}



void MX_GPIO_Init(void)

{

  GPIO_InitTypeDef GPIO_InitStruct = {0};



  __HAL_RCC_GPIOC_CLK_ENABLE();



  HAL_GPIO_WritePin(GPIOC, GPIO_PIN_13, GPIO_PIN_RESET);



  GPIO_InitStruct.Pin = GPIO_PIN_13;

  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;

  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;

  HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);

}



void MX_TIM2_Init(void)

{

  __HAL_RCC_TIM2_CLK_ENABLE();



  htim2.Instance = TIM2;

  htim2.Init.Prescaler = 35999;

  htim2.Init.CounterMode = TIM_COUNTERMODE_UP;

  htim2.Init.Period = 999;

  htim2.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;

  htim2.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;

  if (HAL_TIM_Base_Init(&htim2) != HAL_OK)

  {

    Error_Handler();

  }



  HAL_NVIC_SetPriority(TIM2_IRQn, 0, 0);

  HAL_NVIC_EnableIRQ(TIM2_IRQn);

}



void TIM2_IRQHandler(void)

{

  HAL_TIM_IRQHandler(&htim2);

}



void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)

{

  if (htim->Instance == TIM2)

  {

    HAL_GPIO_TogglePin(GPIOC, GPIO_PIN_13); // 切换LED状态

  }

}



void Error_Handler(void)

{

  while (1)

  {

    // 发生错误时的处理代码

  }

}