PB14如何唤醒STM32F030?

只看该作者 · 2019-8-14 18:55

各位大侠，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，十分感谢！
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
}

只看该作者 · 2019-8-14 18:57

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);

只看该作者 · 2019-8-14 19:00

STM32F030休眠后按下PB14对GND按键，PB13指示灯没有被点亮

只看该作者 · 2019-8-14 19:29

我还试了PA2和PB2，也不能唤醒，只有A0或A1, B0或B1能唤醒，不知道为什么/

只看该作者 · 2019-8-14 19:51

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);
  }
}