NUCLEO-L053R8：低功耗待机模式standby/RTC唤醒（例程分享）

3万 · 2019-1-25 17:02

本帖最后由 mmuuss586 于 2019-1-25 17:04 编辑

NUCLEO-L053R8：低功耗待机模式standby/RTC唤醒（例程分享）

待机模式唤醒后等同复位

基于ST官方NUCLEO-L053R8开发板

用RTC唤醒，实际效果是LED一直在闪

代码下载：见附件

standby mode with RTC：0.85uA VDD=3.0V

/**
* @brief  Main program
* @param  None
* @retval None
*/
int main(void)
{
  /* STM32L0xx HAL library initialization:
   - Configure the Flash prefetch, Flash preread and Buffer caches
   - Systick timer is configured by default as source of time base, but user
         can eventually implement his proper time base source (a general purpose
         timer for example or other time source), keeping in mind that Time base
         duration should be kept 1ms since PPP_TIMEOUT_VALUEs are defined and
         handled in milliseconds basis.
   - Low Level Initialization
   */
  HAL_Init();
  /* Configure LED2 */
  BSP_LED_Init(LED2);
  /* Configure the system clock to 2 MHz */
  SystemClock_Config();

  /* Check and handle if the system was resumed from Standby mode */
  if(__HAL_PWR_GET_FLAG(PWR_FLAG_SB) != RESET)
  {
/* Clear Standby flag */
__HAL_PWR_CLEAR_FLAG(PWR_FLAG_SB);
//如果是唤醒状态，则LED亮3秒
HAL_GPIO_WritePin(GPIOA, GPIO_PIN_5, GPIO_PIN_SET);       //点亮LED,延时3S，再灭LED
HAL_Delay(3000);
HAL_GPIO_WritePin(GPIOA, GPIO_PIN_5, GPIO_PIN_RESET);
  }
else;

/* Configure the system Power */
  SystemPower_Config();

  /* Insert 1 seconds delay */
  HAL_Delay(1000);
/*The Following Wakeup sequence is highly recommended prior to each Standby mode entry
   mainly  when using more than one wakeup source this is to not miss any wakeup event.
   - Disable all used wakeup sources,
   - Clear all related wakeup flags,
   - Re-enable all used wakeup sources,
   - Enter the Standby mode.
   */
  /*Disable all used wakeup sources: Pin1(PA.0)*/
  HAL_PWR_DisableWakeUpPin(PWR_WAKEUP_PIN1);

  /*Clear all related wakeup flags*/
  __HAL_PWR_CLEAR_FLAG(PWR_FLAG_WU);

  /*Re-enable all used wakeup sources: Pin1(PA.0)*/
  HAL_PWR_EnableWakeUpPin(PWR_WAKEUP_PIN1);

  /*Enter the Standby mode*/
  HAL_PWR_EnterSTANDBYMode();

  while (1)
  {
  }
}