STM32超低功耗入门之睡眠模式

 /**

  * [url=home.php?mod=space&uid=247401]@brief[/url] Enter Sleep or Low-power Sleep mode.

  * [url=home.php?mod=space&uid=536309]@NOTE[/url]  In Sleep/Low-power Sleep mode, all I/O pins keep the same state as in Run mode.

  * @param Regulator: Specifies the regulator state in Sleep/Low-power Sleep mode.

  *          This parameter can be one of the following values:

  *            [url=home.php?mod=space&uid=2817080]@ARG[/url] [url=home.php?mod=space&uid=144993]@ref[/url] PWR_MAINREGULATOR_ON Sleep mode (regulator in main mode)

  *            @arg @ref PWR_LOWPOWERREGULATOR_ON Low-power Sleep mode (regulator in low-power mode)

  * @note  Low-power Sleep mode is entered from Low-power Run mode. Therefore, if not yet

  *        in Low-power Run mode before calling HAL_PWR_EnterSLEEPMode() with Regulator set

  *        to PWR_LOWPOWERREGULATOR_ON, the user can optionally configure the

  *        Flash in power-down monde in setting the SLEEP_PD bit in FLASH_ACR register.

  *        Additionally, the clock frequency must be reduced below 2 MHz.

  *        Setting SLEEP_PD in FLASH_ACR then appropriately reducing the clock frequency must

  *        be done before calling HAL_PWR_EnterSLEEPMode() API.

  * @note  When exiting Low-power Sleep mode, the MCU is in Low-power Run mode. To move in

  *        Run mode, the user must resort to HAL_PWREx_DisableLowPowerRunMode() API.

  * @param SLEEPEntry: Specifies if Sleep mode is entered with WFI or WFE instruction.

  *           This parameter can be one of the following values:

  *            @arg @ref PWR_SLEEPENTRY_WFI enter Sleep or Low-power Sleep mode with WFI instruction

  *            @arg @ref PWR_SLEEPENTRY_WFE enter Sleep or Low-power Sleep mode with WFE instruction

  * @note  When WFI entry is used, tick interrupt have to be disabled if not desired as

  *        the interrupt wake up source.

  * @retval None

  */

int main(void)

{

  HAL_Init();



  SystemClock_Config();

  MX_GPIO_Init();



  HAL_Delay(500); // 上电之后延时一会再进入睡眠模式，这样可以保证复位之后可以立即下载程序

  

  HAL_SuspendTick(); // 关闭 tick 中断，防止唤醒睡眠状态的 MCU

  HAL_PWR_EnterSLEEPMode(PWR_MAINREGULATOR_ON, PWR_SLEEPENTRY_WFI);

  HAL_ResumeTick();



  while (1)

  {

      HAL_GPIO_TogglePin(GPIOB, GPIO_PIN_13);

      HAL_Delay(500);

  }

}