10 定时器捕获中断入中断时间可能太长

发布于 2021-02-25 13:34:00 浏览：1355 订阅该版

现在我有个程序需要用到定时器捕获中断，捕获脉冲边沿时间，脉冲频率较高，边沿时间10us~40us左右不等，发现会出现入中断太滞后，入中断后读的时间可能已经是下个边沿捕获的时间了。

程序在Keil中之前也会出现，不过没那么频繁，而且可能是被串口中断抢占了，我把串口中断优先级将为1就不会再出现这种情况了。

但程序我移植到rt-thread后，将systick和串口中断优先级都调低了还是不行。

2 个回答

来一颗糖 2021-02-25

这家伙很懒，什么也没写！

定时器捕获用的是裸机的驱动？

yrw1985 2021-02-25

这家伙很懒，什么也没写！

在board.c下添加的定时器初始化及中断入口函数

else if(htim_base->Instance==TIM2)
  {
  /* USER CODE BEGIN TIM2_MspInit 0 */
  /* USER CODE END TIM2_MspInit 0 */
    /* Peripheral clock enable */
    __HAL_RCC_TIM2_CLK_ENABLE();
    __HAL_RCC_GPIOA_CLK_ENABLE();
    /**TIM2 GPIO Configuration
    PA0     ------> TIM2_CH1
    PA1     ------> TIM2_CH2
    */
    GPIO_InitStruct.Pin = GPIO_PIN_0|GPIO_PIN_1;
    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
    GPIO_InitStruct.Alternate = GPIO_AF1_TIM2;
    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
    /* TIM2 interrupt Init */
    HAL_NVIC_SetPriority(TIM2_IRQn, 0, 0);
    HAL_NVIC_EnableIRQ(TIM2_IRQn);
  /* USER CODE BEGIN TIM2_MspInit 1 */
  /* USER CODE END TIM2_MspInit 1 */
  }

void HAL_TIM_IC_CaptureCallback(TIM_HandleTypeDef *htim)
{
    /* USER CODE BEGIN Callback 1 */
    if (htim->Instance == TIM2 && htim->Channel == HAL_TIM_ACTIVE_CHANNEL_1) {
        // Get delta value
        TIM2_CH1_CaptureCallback(htim2.Instance->CCR1);
    }
}

yrw1985 2021-02-25

这家伙很懒，什么也没写！

static void MX_TIM2_Init(void)
{
  /* USER CODE BEGIN TIM2_Init 0 */
  /* USER CODE END TIM2_Init 0 */
  TIM_ClockConfigTypeDef sClockSourceConfig = {0};
  TIM_MasterConfigTypeDef sMasterConfig = {0};
  TIM_IC_InitTypeDef sConfigIC = {0};
  /* USER CODE BEGIN TIM2_Init 1 */
  /* USER CODE END TIM2_Init 1 */
  htim2.Instance = TIM2;
  htim2.Init.Prescaler = 0;
  htim2.Init.CounterMode = TIM_COUNTERMODE_UP;
  htim2.Init.Period = 4.294967295E9;
  htim2.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
  htim2.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;
  if (HAL_TIM_Base_Init(&htim2) != HAL_OK)
  {
    Error_Handler();
  }
  sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;
  if (HAL_TIM_ConfigClockSource(&htim2, &sClockSourceConfig) != HAL_OK)
  {
    Error_Handler();
  }
  if (HAL_TIM_IC_Init(&htim2) != HAL_OK)
  {
    Error_Handler();
  }
  sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;
  sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
  if (HAL_TIMEx_MasterConfigSynchronization(&htim2, &sMasterConfig) != HAL_OK)
  {
    Error_Handler();
  }
  sConfigIC.ICPolarity = TIM_INPUTCHANNELPOLARITY_RISING;
  sConfigIC.ICSelection = TIM_ICSELECTION_DIRECTTI;
  sConfigIC.ICPrescaler = TIM_ICPSC_DIV1;
  sConfigIC.ICFilter = 0;
  if (HAL_TIM_IC_ConfigChannel(&htim2, &sConfigIC, TIM_CHANNEL_1) != HAL_OK)
  {
    Error_Handler();
  }
  if (HAL_TIM_IC_ConfigChannel(&htim2, &sConfigIC, TIM_CHANNEL_2) != HAL_OK)
  {
    Error_Handler();
  }
  /* USER CODE BEGIN TIM2_Init 2 */
    HAL_TIM_IC_Start_IT(&htim2, TIM_CHANNEL_1);
    HAL_TIM_IC_Start(&htim2, TIM_CHANNEL_2);
  /* USER CODE END TIM2_Init 2 */
}