TOPCB 发表于 2019-1-10 10:18
唤醒方式在手册里面写了。

可以的。en.DM00355687这个文件里有提到可以到stop下唤醒。且en.stm32cubel0的例程里有UART_WakeUpFromStop的代码。我是直接跑的，但就是唤醒不了！！不知道错在哪里！！


以下是官方的例程：
   /* make sure that no UART transfer is on-going */
   while(__HAL_UART_GET_FLAG(&UartHandle, USART_ISR_BUSY) == SET);
   /* make sure that UART is ready to receive
   * (test carried out again later in HAL_UARTEx_StopModeWakeUpSourceConfig) */   
   while(__HAL_UART_GET_FLAG(&UartHandle, USART_ISR_REACK) == RESET);

  /* set the wake-up event:
   * specify wake-up on RXNE flag */
  WakeUpSelection.WakeUpEvent = UART_WAKEUP_ON_READDATA_NONEMPTY;
  if (HAL_UARTEx_StopModeWakeUpSourceConfig(&UartHandle, WakeUpSelection)!= HAL_OK)
  {
    Error_Handler();
  }

  /* Enable the UART Wake UP from stop mode Interrupt */
  __HAL_UART_ENABLE_IT(&UartHandle, UART_IT_WUF);

  /* about to enter stop mode: switch off LED */
  __HAL_RCC_PWR_CLK_ENABLE();
  /* enable MCU wake-up by UART */
  HAL_UARTEx_EnableStopMode(&UartHandle);
  /* enter stop mode */
        BSP_LED_Off(LED3);
  HAL_PWR_EnterSTOPMode(PWR_LOWPOWERREGULATOR_ON, PWR_STOPENTRY_WFI);

  /* ... STOP mode ... */  

  SystemClock_Config();
  /* at that point, MCU has been awoken: the LED has been turned back on */
  /* Wake Up based on RXNE flag successful */
        BSP_LED_On(LED3);
  HAL_UARTEx_DisableStopMode(&UartHandle);

  /* wait for some delay */
  HAL_Delay(1000);
  /* Inform other board that wake up is successful */
  if (HAL_UART_Transmit(&UartHandle, (uint8_t*)aTxBuffer1, COUNTOF(aTxBuffer1)-1, 5000)!= HAL_OK)  
  {
    Error_Handler();
  }  
        HAL_Delay(1000);
  BSP_LED_Off(LED3);
  /*##-2- Wake Up second step  ###############################################*/
  /* make sure that no UART transfer is on-going */
  while(__HAL_UART_GET_FLAG(&UartHandle, USART_ISR_BUSY) == SET);
  /* make sure that UART is ready to receive
   * (test carried out again later in HAL_UARTEx_StopModeWakeUpSourceConfig) */   
  while(__HAL_UART_GET_FLAG(&UartHandle, USART_ISR_REACK) == RESET);

  /* set the wake-up event:
   * specify wake-up on start-bit detection */
  WakeUpSelection.WakeUpEvent = UART_WAKEUP_ON_STARTBIT;
  if (HAL_UARTEx_StopModeWakeUpSourceConfig(&UartHandle, WakeUpSelection)!= HAL_OK)
  {
    Error_Handler();
  }

  /* Enable the UART Wake UP from stop mode Interrupt */
  __HAL_UART_ENABLE_IT(&UartHandle, UART_IT_WUF);

  /* about to enter stop mode: switch off LED */
  BSP_LED_Off(LED3);
  /* enable MCU wake-up by UART */
  HAL_UARTEx_EnableStopMode(&UartHandle);
  /* enter stop mode */
  HAL_PWR_EnterSTOPMode(PWR_LOWPOWERREGULATOR_ON, PWR_STOPENTRY_WFI);

  /* ... STOP mode ... */

  /* at that point, MCU has been awoken: the LED has been turned back on */
  /* Wake Up on start bit detection successful */
  HAL_UARTEx_DisableStopMode(&UartHandle);
  /* wait for some delay */
  HAL_Delay(100);
  /* Inform other board that wake up is successful */
  if (HAL_UART_Transmit(&UartHandle, (uint8_t*)aTxBuffer2, COUNTOF(aTxBuffer2)-1, 5000)!= HAL_OK)  
  {
    Error_Handler();
  }