停止模式

1万 · 2020-5-27 22:13

进入停止模式之前调用了：
SystemPower_Config()函数
static void SystemPower_Config(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;

  /* Enable Ultra low power mode */
  HAL_PWREx_EnableUltraLowPower();

  /* Enable the fast wake up from Ultra low power mode */
  HAL_PWREx_EnableFastWakeUp();

  /* Select HSI as system clock source after Wake Up from Stop mode */
  __HAL_RCC_WAKEUPSTOP_CLK_CONFIG(RCC_STOP_WAKEUPCLOCK_HSI);

  /* Enable GPIOs clock */
  __HAL_RCC_GPIOA_CLK_ENABLE();
  __HAL_RCC_GPIOB_CLK_ENABLE();
  __HAL_RCC_GPIOC_CLK_ENABLE();
  __HAL_RCC_GPIOD_CLK_ENABLE();
  __HAL_RCC_GPIOH_CLK_ENABLE();

  /* Configure all GPIO port pins in Analog Input mode (floating input trigger OFF) */
  GPIO_InitStructure.Pin = GPIO_PIN_All;
  GPIO_InitStructure.Mode = GPIO_MODE_ANALOG;
  GPIO_InitStructure.Pull = GPIO_NOPULL;
  HAL_GPIO_Init(GPIOA, &GPIO_InitStructure);
  HAL_GPIO_Init(GPIOB, &GPIO_InitStructure);
  HAL_GPIO_Init(GPIOC, &GPIO_InitStructure);
  HAL_GPIO_Init(GPIOD, &GPIO_InitStructure);
  HAL_GPIO_Init(GPIOH, &GPIO_InitStructure);

  /* Disable GPIOs clock */
  __HAL_RCC_GPIOA_CLK_DISABLE();
  __HAL_RCC_GPIOB_CLK_DISABLE();
  __HAL_RCC_GPIOC_CLK_DISABLE();
  __HAL_RCC_GPIOD_CLK_DISABLE();
  __HAL_RCC_GPIOH_CLK_DISABLE();

}

然后进入： HAL_PWR_EnterSTOPMode(PWR_LOWPOWERREGULATOR_ON, PWR_STOPENTRY_WFI);
SystemClockConfig_STOP();

唤醒正常，但是重新初始化串口（串口里面初始化了GPIO和CLK），却无法打印，这是为什么？

2万 · 2020-5-27 22:16

你可以参考一下。官方的低功耗的串口的使用方法

2万 · 2020-5-27 22:20

__HAL_RCC_GPIOA_CLK_DISABLE();
  __HAL_RCC_GPIOB_CLK_DISABLE();
  __HAL_RCC_GPIOC_CLK_DISABLE();
  __HAL_RCC_GPIOD_CLK_DISABLE();
  __HAL_RCC_GPIOH_CLK_DISABLE();
都搞死了  怎么能用！