[嵌入式]cubemx定时器中断与外部中断

定时器中断LED闪烁

定时器

1.定时功能：

? 时钟信号CK_PSC输入

? 预分频器PSC分频得到CK_CNT

? 计数器CNT对CK_CNT计数，到自动重装载数ARR时重复计数器减一，计数器0时出现更新事件UEV（递增、递减、中心 对齐）

配置

1.配置

设置时钟源：外部高速HSE，晶振时钟

选择HSE以及对应通路，设定AP1为72M，自动生成solution

HSE：外部高速时钟 
HSI：内部高速时钟
LSE: 外部低速时钟
LSI：内部低速时钟

外设挂载于哪个总线：查手册系统架构图

slave mode
	External Clock Mode1——外部时钟:使用外部时钟源作为定时器时钟
	Reset Mode——复位模式:什么都不设置
	Gated Mode——门控模式：由主定时器电平高低来控制是否工作
	TriggerMode——触发模式：由主定时器信号变化触发是否工作
与主从模式有关

2.中断设置

stm32f1xx_it.c

void TIM2_IRQHandler(void)
{
  HAL_TIM_IRQHandler(&htim2);
}

stm32f1xx_hal_tim.c

void HAL_TIM_IRQHandler(TIM_HandleTypeDef *htim)
{
  if (__HAL_TIM_GET_FLAG(htim, TIM_FLAG_UPDATE) != RESET)
  {
    if (__HAL_TIM_GET_IT_SOURCE(htim, TIM_IT_UPDATE) != RESET)
    {
      __HAL_TIM_CLEAR_IT(htim, TIM_IT_UPDATE);
#if (USE_HAL_TIM_REGISTER_CALLBACKS == 1)
      htim->PeriodElapsedCallback(htim);
#else
      HAL_TIM_PeriodElapsedCallback(htim);
#endif /* USE_HAL_TIM_REGISTER_CALLBACKS */
    }
  }
}

__weak void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
{
  /* Prevent unused argument(s) compilation warning */
  UNUSED(htim);

  /* NOTE : This function should not be modified, when the callback is needed,
            the HAL_TIM_PeriodElapsedCallback could be implemented in the user file
   */
}

3.修改callback函数

callback函数if之前翻转电平无效
这里也可以直接toggle

void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
{
  /* Prevent unused argument(s) compilation warning */
   static unsigned char ledState = 0;
    if (htim == (&htim2))
    {
        if (ledState == 0){
            HAL_GPIO_WritePin(LED1_GPIO_Port,LED1_Pin,GPIO_PIN_RESET);
            HAL_GPIO_WritePin(LED2_GPIO_Port,LED2_Pin,GPIO_PIN_SET);
        }
        else{
            HAL_GPIO_WritePin(LED1_GPIO_Port,LED1_Pin,GPIO_PIN_SET);
            HAL_GPIO_WritePin(LED2_GPIO_Port,LED2_Pin,GPIO_PIN_RESET);
        }
        ledState = !ledState;
    }
}

按键中断LED

1.GPIO设为中断模式，mode选择下降沿触发中断（中断和事件的区别：软硬件）

2.exit打开对应通道，选择优先级

查看stm32f1xx_it.c

void EXTI2_IRQHandler(void)
{
  /* USER CODE BEGIN EXTI2_IRQn 0 */

  /* USER CODE END EXTI2_IRQn 0 */
  HAL_GPIO_EXTI_IRQHandler(KEY2_Pin);
  /* USER CODE BEGIN EXTI2_IRQn 1 */

  /* USER CODE END EXTI2_IRQn 1 */
}

/**
  * @brief This function handles EXTI line3 interrupt.
  */
void EXTI3_IRQHandler(void)
{
  /* USER CODE BEGIN EXTI3_IRQn 0 */

  /* USER CODE END EXTI3_IRQn 0 */
  HAL_GPIO_EXTI_IRQHandler(KEY3_Pin);
  /* USER CODE BEGIN EXTI3_IRQn 1 */

  /* USER CODE END EXTI3_IRQn 1 */
}

/**
  * @brief This function handles EXTI line4 interrupt.
  */
void EXTI4_IRQHandler(void)
{
  /* USER CODE BEGIN EXTI4_IRQn 0 */

  /* USER CODE END EXTI4_IRQn 0 */
  HAL_GPIO_EXTI_IRQHandler(KEY4_Pin);
  /* USER CODE BEGIN EXTI4_IRQn 1 */

  /* USER CODE END EXTI4_IRQn 1 */
}

/**
  * @brief This function handles TIM2 global interrupt.
  */
void TIM2_IRQHandler(void)
{
  /* USER CODE BEGIN TIM2_IRQn 0 */

  /* USER CODE END TIM2_IRQn 0 */
  HAL_TIM_IRQHandler(&htim2);
  /* USER CODE BEGIN TIM2_IRQn 1 */

  /* USER CODE END TIM2_IRQn 1 */
}

/**
  * @brief This function handles EXTI line[15:10] interrupts.
  */
void EXTI15_10_IRQHandler(void)
{
  /* USER CODE BEGIN EXTI15_10_IRQn 0 */

  /* USER CODE END EXTI15_10_IRQn 0 */
  HAL_GPIO_EXTI_IRQHandler(KEY1_Pin);
  /* USER CODE BEGIN EXTI15_10_IRQn 1 */

  /* USER CODE END EXTI15_10_IRQn 1 */
}

stm32f1xx_hal_gpio.c

中断服务函数

void HAL_GPIO_EXTI_IRQHandler(uint16_t GPIO_Pin)
{
  /* EXTI line interrupt detected */
  if (__HAL_GPIO_EXTI_GET_IT(GPIO_Pin) != 0x00u)
  {
    __HAL_GPIO_EXTI_CLEAR_IT(GPIO_Pin);
    HAL_GPIO_EXTI_Callback(GPIO_Pin);
  }
}

__weak void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin)
{
  /* Prevent unused argument(s) compilation warning */
  UNUSED(GPIO_Pin);
  /* NOTE: This function Should not be modified, when the callback is needed,
           the HAL_GPIO_EXTI_Callback could be implemented in the user file
   */
}

修改自定义回调函数