STM32

关于stm32f4上的Timer1的问题

2019-07-14 18:02发布

站内问答 / STM32/STM8
6413 8 1440
我在avr上进行了长时间的编程后尝试了STM32，我想使用计时器来处理冻结：
  1. <font size="4">HAL_tiM_Base_Start_IT(&htim1);
  2. while ((GPIOA->IDR  & GPIO_PIN_3) == 0x08)
  3. {
  4.         Clk_h
  5.     DWT_Delay(200);
  6.     Clk_l
  7.     DWT_Delay(200);
  8. }
  9. HAL_TIM_Base_Stop_IT(&htim1);</font>
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在上面的代码我等待GPIO_PIN_3将变为低状态。事情是它可能会永远保持高状态，所以我想启动timer1并在500ms之后启动触发中断。问题是while循环捕获0需要大约100us，而我的计时器配置为：


  1. static void MX_TIM1_Init(void)
  2. {

  4.   TIM_ClockConfigTypeDef sClockSourceConfig;
  5.   TIM_MasterConfigTypeDef sMasterConfig;

  7.   htim1.Instance = TIM1;
  8.   htim1.Init.Prescaler = 16799;
  9.   htim1.Init.CounterMode = TIM_COUNTERMODE_UP;
  10.   htim1.Init.Period = 4999;
  11.   htim1.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
  12.   htim1.Init.RepetitionCounter = 0;
  13.   if (HAL_TIM_Base_Init(&htim1) != HAL_OK)
  14.   {
  15.     _Error_Handler(__FILE__, __LINE__);
  16.   }

  18.   sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;
  19.   if (HAL_TIM_ConfigClockSource(&htim1, &sClockSourceConfig) != HAL_OK)
  20.   {
  21.     _Error_Handler(__FILE__, __LINE__);
  22.   }

  24.   sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;
  25.   sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
  26.   if (HAL_TIMEx_MasterConfigSynchronization(&htim1, &sMasterConfig) != HAL_OK)
  27.   {
  28.     _Error_Handler(__FILE__, __LINE__);
  29.   }

  31. }
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所以它远远超过100us，不知道为什么。正如我理解计时器，启动它后，它应该开始计数，当达到该值时，它将触发中断。但即使我立即开始和停止计时器，这里：
  1. HAL_TIM_Base_Start_IT(&htim1);
  2. HAL_TIM_Base_Stop_IT(&htim1);
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无论如何它会触发一次。我只需要在计数寄存器溢出时触发中断功能。这是我的溢出函数，它位于stm32f4xx_it.c：
  1. void TIM1_UP_TIM10_IRQHandler(void)
  2. {
  3.   /* USER CODE BEGIN TIM1_UP_TIM10_IRQn 0 */

  5.   /* USER CODE END TIM1_UP_TIM10_IRQn 0 */
  6.   HAL_TIM_IRQHandler(&htim1);
  7.   /* USER CODE BEGIN TIM1_UP_TIM10_IRQn 1 */
  8.     sprintf(str123,"<<FAIL>>");
  9.     CDC_Transmit_FS((uint8_t*)str123,strlen(str123));
  10.   /* USER CODE END TIM1_UP_TIM10_IRQn 1 */
  11. }
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8条回答
uvysdfydad
2019-07-15 12:55
我不太习惯用HAL，所以这里是如何通过直接访问定时器外设来做你想做的事情：
// SETUP STUFF:

// Enable the timer clock. I use the HAL for this
// as it adds the required startup delay. The code
// is pretty simple though.
__HAL_RCC_TIM1_CLK_ENABLE();

// Reset the control register. This gives us the
// default operation which is counting up with no
// divider.
TIM1->CR1 = 0;

// Set prescaler
TIM1->PSC = 16799;

// Will generate interrupt when this value is reached
TIM1->ARR = 4999;

// The PSC and ARR values are currently in the preload
// registers. To load them into the active registers we
// need an update event. We can do this manually as
// follows (or we could wait for the timer to expire).
TIM1->EGR |= TIM_EGR_UG;

// Timer is now ready to use.

// POLLING OPERATION:

// Next we setup the interrupts. We should first clear
// the update interrupt flag in case it has already been
// set.
TIM1->SR = ~TIM_SR_UIF;

// Then we can enable the update interrupt source
TIM1->DIER |= TIM_DIER_UIE;

// Note: we also need to setup the interrupt channel on
// the NVIC. Once that is done the isr will fire
// when the timer reaches 5000.

// We can now start the timer running...
TIM1->CR1 |= TIM_CR_CEN;

while ((GPIOA->IDR  & GPIO_PIN_3) == 0x08)
{
    Clk_h
    DWT_Delay(200);
    Clk_l
    DWT_Delay(200);
}

// ...and stop the timer when we're done
TIM1->CR1 &= ~TIM_CR_CEN;

// Note if we want to repeat the polling loop again we should
// issue another TIM1->EGR |= TIM_EGR_UG event as this
// resets the timer to zero.

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