求助，stop模式下使用定时器超时事件唤醒

kun0226 · 发表于 2016-7-23 15:27:23

最近在搞低功耗实验，想要通过定时器超时产生一个超时事件来唤醒进入stop模式的机器，我用的是stm32l051这款低功耗芯片，里面有个LPTIM
[mw_shl_code=c,true]/* Configure the System clock to have a frequency of 2 MHz (Up to 32MHZ possible) */
  SystemClock_Config();

   /* Enable the LSI source */
  LSI_ClockEnable();

  /* Add your application code here*/
/* ### - 1 - Re-target the LSI to Clock the LPTIM Counter ################# */
  /* Select the LSI clock as LPTIM peripheral clock */
  RCC_PeriphCLKInitStruct.PeriphClockSelection = RCC_PERIPHCLK_LPTIM1;
  RCC_PeriphCLKInitStruct.LptimClockSelection = RCC_LPTIM1CLKSOURCE_LSI;
  HAL_RCCEx_PeriphCLKConfig(&RCC_PeriphCLKInitStruct);

/* ### - 2 - Initialize LPTIM peripheral ################################## */
  /*
*  Instance       = LPTIM1.
*  Clock Source = APB or LowPowerOSCillator (in this example LSI is
*                   already selected from the RCC level).
*  Counter source  = Internal event.
*  Clock prescaler = 1 (No division).
*  Counter Trigger = Trigger1: PC3 or PB6 (PB6 in this example).
*  Active Edge    = Rising edge.
*/

  LptimHandle.Instance = LPTIM1;

  LptimHandle.Init.Clock.Source    = LPTIM_CLOCKSOURCE_APBCLOCK_LPOSC;
  LptimHandle.Init.Clock.Prescaler = LPTIM_PRESCALER_DIV1;
  //LptimHandle.Init.Trigger.Source    = LPTIM_TRIGSOURCE_0;
  //LptimHandle.Init.Trigger.ActiveEdge = LPTIM_ACTIVEEDGE_RISING;
  LptimHandle.Init.CounterSource    = LPTIM_COUNTERSOURCE_INTERNAL;

/* Initialize LPTIM peripheral according to the passed parameters */
  HAL_LPTIM_Init(&LptimHandle);

EXTI->EMR|=(0x1<<29);
EXTI->IMR|=(0x1<<29);

LPTIM1->CFGR |= 0x00080000;
LPTIM1->IER |=0x1;
LPTIM1->ARR =65535;
LPTIM1->CMP =37000;
LPTIM1->CR |=  0x00000004;
LPTIM1->CR |=  0x00000001;

HAL_Delay(1000);
HAL_Delay(1000);
HAL_Delay(1000);
HAL_Delay(1000);
HAL_Delay(1000);
HAL_Delay(1000);
HAL_Delay(1000);
HAL_Delay(1000);
HAL_Delay(1000);

__HAL_PWR_CLEAR_FLAG(PWR_FLAG_WU);
HAL_PWR_EnterSTOPMode(PWR_MAINREGULATOR_ON, PWR_STOPENTRY_WFE);

   SystemClock_Config();

   /* Enable the LSI source */
  LSI_ClockEnable();
[/mw_shl_code]