为什么在做外部中断的时候只有用PA口才能触发中断呢？

只看该作者 · 2015-9-4 23:07

本帖最后由 kangbin334 于 2015-9-4 23:14 编辑

#include "stm32f10x.h"
#include "led.h"
#include "delay.h"
#include "stm32f10x_exti.h"
#include "stm32f10x_it.h"

int main(void)

{

      led_init();
      delay_init();


      RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO|RCC_APB2Periph_GPIOC,ENABLE);

      GPIO_EventOutputConfig(GPIO_PortSourceGPIOC,GPIO_PinSource0);

  NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);


      EXTI_InitTypeDef aaa;
      aaa.EXTI_Line=EXTI_Line0;
      aaa.EXTI_LineCmd=ENABLE;
      aaa.EXTI_Mode=EXTI_Mode_Interrupt;
      aaa.EXTI_Trigger=EXTI_Trigger_Falling;
      EXTI_Init(&aaa);


      NVIC_InitTypeDef bbb;
      bbb.NVIC_IRQChannel=EXTI0_IRQn;
      bbb.NVIC_IRQChannelCmd=ENABLE;
      bbb.NVIC_IRQChannelPreemptionPriority=0;
      bbb.NVIC_IRQChannelSubPriority=0;
      NVIC_Init(&bbb);

      EXTI_ClearITPendingBit(EXTI_Line0);

      while(1);
}

void EXTI0_IRQHandler(void)

{

      GPIOF->ODR=0xfffd;

  EXTI_ClearFlag(EXTI_Line0);
      EXTI_ClearITPendingBit(EXTI_Line0);
}

这个程序什么都不用改，只要把中断口PC0换成PA0就能进中断，而且现在是只有PA0能进中断。