NUCLEO-L053R8：低功耗待机模式standby/PA0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PA0引脚唤醒（用杜邦线接高电平唤醒）

代码下载：见附件

standby mode without RTC：0.29uA 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)
  {
  }
}