STM32外部中断不断触发

Question

我想使用一个旋转编码器和按钮与STM32F103和FreeRTOS。 pin0和pin1的外部中断工作正常，但该按钮连接到Pin13（EXTI15_10_IRQHandler），该引脚保持无故触发。 当然，我可以使用pin2（EXTI2_IRQHandler）4或轮询按钮引脚而不中断，但我想知道原因。 我在这里错过了什么？

// button 
#define ROEN_BUTTON_GPIO  GPIOC 
#define ROEN_BUTTON_PIN   GPIO_Pin_13 

    // init method 

    NVIC_InitTypeDef NVIC_InitStruct; 
    EXTI_InitTypeDef EXTI_InitStruct; 
    GPIO_InitTypeDef GPIO_InitStructure; 
    GPIO_StructInit(&GPIO_InitStructure); 

    /** 
    * GPIO configuration 
    * Configure pins as input w/ pullup 
    */ 
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU; 
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; 
    GPIO_InitStructure.GPIO_Pin = ROEN_BUTTON_PIN;  // Button 
    GPIO_Init(ROEN_BUTTON_GPIO, &GPIO_InitStructure); 

    /* Tell system that you will use PC13 for EXTI_Line13 */ 
    GPIO_EXTILineConfig(GPIO_PortSourceGPIOC, EXTI_Line13); 

    /* Enable interrupt */ 
    EXTI_InitStruct.EXTI_LineCmd = ENABLE; 
    /* Interrupt mode */ 
    EXTI_InitStruct.EXTI_Mode = EXTI_Mode_Interrupt; 
    /* Triggers on rising and falling edge */ 
    EXTI_InitStruct.EXTI_Trigger = EXTI_Trigger_Falling; 
    /* PC13 is connected to EXTI_Line13 */ 
    EXTI_InitStruct.EXTI_Line = EXTI_Line13; 
    EXTI_Init(&EXTI_InitStruct); 


    /* Enable interrupt */ 
    NVIC_InitStruct.NVIC_IRQChannelCmd = ENABLE; 
    NVIC_InitStruct.NVIC_IRQChannel = EXTI15_10_IRQn; 
    /* Set priority */ 
    NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority = 0x03; 
    /* Add to NVIC */ 
    NVIC_Init(&NVIC_InitStruct); 


/* Handle PC13 interrupt */ 
void EXTI15_10_IRQHandler(void) { 
    /* Make sure that interrupt flag is set */ 
    if (EXTI_GetITStatus(EXTI_Line13) != RESET) { 
     /* Clear interrupt flag */ 
     EXTI_ClearITPendingBit(EXTI_Line13); 
    } 
} 

Answer 1

我发现错误与额外的编译器警告：

void GPIO_EXTILineConfig(uint8_t GPIO_PortSource, uint8_t GPIO_PinSource); 

我使用了错误的宏GPIO_PinSource，它必须是

GPIO_EXTILineConfig(GPIO_PortSourceGPIOC, GPIO_PinSource13);