PB14如何唤醒STM32F030?

1万 · 2021-8-8 18:06

之前我用PB0口作唤醒键可以成功唤醒休眠后的STM32F030，因为项目需求，要改成用PB14来唤醒，但我将程序改成PB14后就唤不醒STM32F030，不知道为什么，请各位大侠指点一下

1万 · 2021-8-8 18:10

楼主程序可以公开吗？贴程序看下吧，这么说看不出什么原因

1万 · 2021-8-8 18:16

void MCU_EnterSTOPMode(void)                                                                                              //MCU进入停机模式
{
      uint8_t temp;
NVIC_InitTypeDef NVIC_InitStructure;
      EXTI_InitTypeDef EXTI_InitStruct;

      GPIO_SetBits(GPIOB,GPIO_Pin_13);                                                                               //熄灭工作指示灯

      //================================== TIM16 OFF ===========================================
      TIM_ITConfig(TIM16, TIM_IT_Update, DISABLE);
      TIM_ClearITPendingBit(TIM16, TIM_IT_Update);
      NVIC_InitStructure.NVIC_IRQChannel = TIM16_IRQn;
      NVIC_InitStructure.NVIC_IRQChannelPriority = 1;
      NVIC_InitStructure.NVIC_IRQChannelCmd = DISABLE;
      NVIC_Init(&NVIC_InitStructure);
      TIM_ClearITPendingBit(TIM16, TIM_IT_Update);
      TIM_DeInit(TIM16);

      //Select HSI as system clock source
      RCC->CFGR &= (uint32_t)((uint32_t)~(RCC_CFGR_SW));
      RCC->CFGR |= (uint32_t)RCC_CFGR_SW_HSI;

      //Wait till HSI is used as system clock source
      while ((RCC->CFGR & (uint32_t)RCC_CFGR_SWS) != (uint32_t)RCC_CFGR_SWS_HSI)
      {
      }

      //Disable PLL
      RCC->CR &= ~RCC_CR_PLLON;

      //Wait till PLL off
      while((RCC->CR & RCC_CR_PLLRDY) != 0)
      {
      }

      //Enable SYSCFG clock
      RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);

      EXTI_ClearITPendingBit(EXTI_Line14);

      SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOB, EXTI_PinSource14);
      EXTI_InitStruct.EXTI_Line = EXTI_Line14;
      EXTI_InitStruct.EXTI_Mode = EXTI_Mode_Interrupt;
      EXTI_InitStruct.EXTI_Trigger = EXTI_Trigger_Rising_Falling;                //上升沿下降沿中断
      EXTI_InitStruct.EXTI_LineCmd = ENABLE;
      EXTI_Init(&EXTI_InitStruct);

      NVIC_InitStructure.NVIC_IRQChannel = EXTI4_15_IRQn;
      NVIC_InitStructure.NVIC_IRQChannelPriority = 0x00;
      NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
      NVIC_Init(&NVIC_InitStructure);

      RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE);                      //开电源管理时钟
      // Request to enter STOP mode with regulator in low power mode
      PWR_EnterSTOPMode(PWR_Regulator_LowPower,PWR_STOPEntry_WFI);
////////////////////////////////////////////////////////////////////////////////////
      for( temp = 10; temp != 0; temp-- );

      SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOB, EXTI_PinSource14);
      EXTI_InitStruct.EXTI_Line = EXTI_Line14;
      EXTI_InitStruct.EXTI_Mode = EXTI_Mode_Interrupt;
      EXTI_InitStruct.EXTI_Trigger = EXTI_Trigger_Rising_Falling;                //上升沿下降沿中断
      EXTI_InitStruct.EXTI_LineCmd = DISABLE;
      EXTI_Init(&EXTI_InitStruct);

      NVIC_InitStructure.NVIC_IRQChannel = EXTI4_15_IRQn;
      NVIC_InitStructure.NVIC_IRQChannelPriority = 0x00;
      NVIC_InitStructure.NVIC_IRQChannelCmd = DISABLE;
      NVIC_Init(&NVIC_InitStructure);

EXTI_ClearITPendingBit(EXTI_Line14);

      GPIO_ResetBits(GPIOB,GPIO_Pin_13);                                                                      //点亮工作指示灯
}

1万 · 2021-8-8 18:19

PB0和PB14是设成内部上拉输入的
      RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOB, ENABLE);
      GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_14;
      GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;
      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
      GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
      GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
      GPIO_Init(GPIOB, &GPIO_InitStructure);

1万 · 2021-8-8 18:20

STM32F030休眠后按下PB14对GND按键，PB13指示灯没有被点亮

1万 · 2021-8-8 18:25

PA2和PB2

1万 · 2021-8-8 18:28

不能唤醒

1万 · 2021-8-8 18:30

只有A0或A1, B0或B1能唤醒，不知道为什么/

1万 · 2021-8-8 18:31

找到原因了，是我在中断中写错语句了，没有清到中断标志，所以PB14唤醒后就一直进出EXTI中断，无法执行正常程序。
void EXTI4_15_IRQHandler(void)
{
  if(EXTI_GetITStatus(EXTI_Line0|EXTI_Line1) != RESET)
  {
/* Clear the EXTI line 0 pending bit */
EXTI_ClearITPendingBit(EXTI_Line14);
  }
}
void EXTI4_15_IRQHandler(void)
{
  if(EXTI_GetITStatus(EXTI_Line0|EXTI_Line1) != RESET)
  {
/* Clear the EXTI line 0 pending bit */
EXTI_ClearITPendingBit(EXTI_Line14);
  }
}
更正为：
void EXTI4_15_IRQHandler(void)
{
  if(EXTI_GetITStatus(EXTI_Line14) != RESET)
  {
/* Clear the EXTI line 0 pending bit */
EXTI_ClearITPendingBit(EXTI_Line14);
  }
}

1万 · 2021-8-8 18:34

外部中断应该可以啊

1万 · 2021-8-8 18:37

可以通过不同的方式进行唤醒看楼主如何进行配置了

1万 · 2021-8-8 18:40

楼主把pb14配置成什么模式了啊

1万 · 2021-8-8 18:42

用中断进行唤醒

1万 · 2021-8-8 18:44

唉，还是没有什么结果，算了，多谢大家啦

只看该作者 · 2021-9-6 09:00

这个引脚有什么其他用处吗

1万 · 2021-9-6 09:01

能进入中断吗

只看该作者 · 2021-9-6 09:08

是不是不小心复用了啊

只看该作者 · 2021-9-6 09:10

再换一个引脚试试看

1万 · 2021-9-7 14:35

是什么低功耗模式啊

1万 · 2021-9-7 14:39

引脚初始化那边别忘了做