测试发现STM32H7的LPTIM1的中断可以唤醒停机模式，其它几个LPTIM2-5无法唤醒，邪门

只看该作者 · 2018-8-1 19:06

对于LPTIM1，各种中断方式都可以唤醒停机模式，比如PWM中断，超时中断等（含软件触发和外部触发）。

而LPTIM2-LPTIM5的各种中断方式却都无法唤醒停机模式，但不做唤醒使用，也都正常，邪门了，看勘误手册也没有这种bug。

邪门，备份下这个问题吧。

停机模式下使用的LSE或者LSI为LPTIM提供时钟。

LPTIM1软件触发超时中断方式。

程序里面配置了8分频，4秒后唤醒。

LPTIM_HandleTypeDef          LptimHandle = {0};
void bsp_InitLPTIM2(void)
{
      GPIO_InitTypeDef GPIO_InitStruct = {0};
      RCC_OscInitTypeDef RCC_OscInitStruct = {0};

      /* ## - 1 - Enable LPTIM clock ############################################ */
      __HAL_RCC_LPTIM1_CLK_ENABLE();
      __HAL_RCC_LPTIM2_CLK_ENABLE();

      __HAL_RCC_GPIOE_CLK_ENABLE();

      GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
      GPIO_InitStruct.Pull = GPIO_PULLUP;
      GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
      GPIO_InitStruct.Alternate = GPIO_AF1_LPTIM1;
      GPIO_InitStruct.Pin = GPIO_PIN_0;
      HAL_GPIO_Init(GPIOE, &GPIO_InitStruct);

      RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSE;
      RCC_OscInitStruct.LSEState = RCC_LSE_ON;
      RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;

      if (HAL_RCC_OscConfig(&RCC_OscInitStruct)!= HAL_OK)
      {
      Error_Handler(__FILE__, __LINE__);
      }

      RCC_PeriphCLKInitStruct.PeriphClockSelection = RCC_PERIPHCLK_LPTIM1;
      RCC_PeriphCLKInitStruct.Lptim1ClockSelection = RCC_LPTIM1CLKSOURCE_LSE;
      HAL_RCCEx_PeriphCLKConfig(&RCC_PeriphCLKInitStruct);

      /* ### - 2 - Initialize the LPTIM peripheral ############################## */
      LptimHandle.Instance = LPTIM1;

      LptimHandle.Init.Clock.Source = LPTIM_CLOCKSOURCE_APBCLOCK_LPOSC;
      LptimHandle.Init.Clock.Prescaler = LPTIM_PRESCALER_DIV8;
      LptimHandle.Init.CounterSource = LPTIM_COUNTERSOURCE_INTERNAL;
      LptimHandle.Init.Trigger.Source  = LPTIM_TRIGSOURCE_SOFTWARE;
//       LptimHandle.Init.Trigger.Source    = LPTIM_TRIGSOURCE_0;
//       LptimHandle.Init.Trigger.ActiveEdge = LPTIM_ACTIVEEDGE_FALLING;
      LptimHandle.Init.OutputPolarity  = LPTIM_OUTPUTPOLARITY_HIGH;
      LptimHandle.Init.UpdateMode    = LPTIM_UPDATE_IMMEDIATE;
      LptimHandle.Init.Input1Source = LPTIM_INPUT1SOURCE_GPIO;
      LptimHandle.Init.Input2Source = LPTIM_INPUT2SOURCE_GPIO;

      /* Initialize LPTIM peripheral according to the passed parameters */
      if (HAL_LPTIM_Init(&LptimHandle) != HAL_OK)
      {
      Error_Handler(__FILE__, __LINE__);
      }

      /* Enable and set LPTIM Interrupt to the highest priority */
      HAL_NVIC_SetPriority(LPTIM1_IRQn, 1, 0);
      HAL_NVIC_EnableIRQ(LPTIM1_IRQn);

      /* ### - 3 - Start counting in interrupt mode ############################# */
      if (HAL_LPTIM_TimeOut_Start_IT(&LptimHandle, 32768, 32768/2) != HAL_OK)
      {
      Error_Handler(__FILE__, __LINE__);
      }

//       if (HAL_LPTIM_PWM_Start_IT(&LptimHandle, 32768, 32768/2) != HAL_OK)
//       {
//    Error_Handler(__FILE__, __LINE__);
//       }

      /* ### - 4 - Enter in Stop mode ########################################### */
      HAL_PWR_EnterSTOPMode(PWR_LOWPOWERREGULATOR_ON, PWR_STOPENTRY_WFI);

      SystemClock_Config();
}

void LPTIM1_IRQHandler(void)
{
      HAL_LPTIM_IRQHandler(&LptimHandle);
      bsp_LedToggle(4);
}

测试发现STM32H7的LPTIM1的中断可以唤醒停机模式，其它几个LPTIM2-5无法唤醒，邪门

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