LPTIM

cj2333 提问时间：2021-6-8 22:33 / 未解决

问答
是否解决:	未解决

我这边要在stop模式下让LPTIM1和LPTIM2输出两路相同的PWM，不管是用LSI还是LSE都会有200us的相位差,

但是不在stop模式下用内部主频的4Mhz的时钟源，就没有200us相位差，有人知道这是啥问题吗，谢谢
代码附上：
while (1)
  {

      HAL_LPTIM_PWM_Start(&hlptim1,32-1,16-1);
      HAL_LPTIM_PWM_Start(&hlptim2,32-1,16-1);
      HAL_Delay (2500);
      HAL_PWR_EnterSTOPMode(PWR_LOWPOWERREGULATOR_ON,PWR_STOPENTRY_WFI);  //直接进入停止模式，中断唤醒。然后时间到了就会唤醒

/* USER CODE END WHILE */

/* USER CODE BEGIN 3 */
  }

  PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_RTC|RCC_PERIPHCLK_LPTIM1
                           |RCC_PERIPHCLK_LPTIM2;
  PeriphClkInit.Lptim1ClockSelection = RCC_LPTIM1CLKSOURCE_LSE;
  PeriphClkInit.Lptim2ClockSelection = RCC_LPTIM2CLKSOURCE_LSE;
  PeriphClkInit.RTCClockSelection = RCC_RTCCLKSOURCE_LSE;

void MX_LPTIM1_Init(void)
{

  /* USER CODE BEGIN LPTIM1_Init 0 */

  /* USER CODE END LPTIM1_Init 0 */

  /* USER CODE BEGIN LPTIM1_Init 1 */

  /* USER CODE END LPTIM1_Init 1 */
  hlptim1.Instance = LPTIM1;
  hlptim1.Init.Clock.Source = LPTIM_CLOCKSOURCE_APBCLOCK_LPOSC;
  hlptim1.Init.Clock.Prescaler = LPTIM_PRESCALER_DIV1;
  hlptim1.Init.Trigger.Source = LPTIM_TRIGSOURCE_SOFTWARE;
  hlptim1.Init.OutputPolarity = LPTIM_OUTPUTPOLARITY_LOW;
  hlptim1.Init.UpdateMode = LPTIM_UPDATE_IMMEDIATE;
  hlptim1.Init.CounterSource = LPTIM_COUNTERSOURCE_INTERNAL;
  hlptim1.Init.Input1Source = LPTIM_INPUT1SOURCE_GPIO;
  hlptim1.Init.Input2Source = LPTIM_INPUT2SOURCE_GPIO;
  if (HAL_LPTIM_Init(&hlptim1) != HAL_OK)
  {
Error_Handler();
  }
  /* USER CODE BEGIN LPTIM1_Init 2 */

  /* USER CODE END LPTIM1_Init 2 */

}