今天搞了一下stm32的外部中断，stm32的外部中断是分组的，PA0，PB0，PC0等为一组，PA1，PB1，PC1等为一组 ，组0，1，2，3，4为独立组，各自可以独立产生中断（同时只能一路进入中断），5-9为一组共用一个中断入口，10-15为一组共用一个中断入口，下面的为按下GPIO_Pin_1|GPIO_Pin_2|GPIO_Pin_3|GPIO_Pin_4对应的按钮，那么对应的GPIO_Pin_0|GPIO_Pin_1|GPIO_Pin_2|GPIO_Pin_3就会实现电平翻转。
关键词以标出
#include"stm32f10x.h"
EXTI_InitTypeDef EXTI_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
int main()
{
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_GPIOC,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE);//复用
GPIO_InitStructure.GPIO_Pin =GPIO_Pin_1|GPIO_Pin_2|GPIO_Pin_3|GPIO_Pin_4;
GPIO_InitStructure.GPIO_Mode =GPIO_Mode_IPU;//上拉
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin =GPIO_Pin_0|GPIO_Pin_1|GPIO_Pin_2|GPIO_Pin_3;
GPIO_InitStructure.GPIO_Mode =GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed=GPIO_Speed_2MHz;
GPIO_Init(GPIOC, &GPIO_InitStructure);
GPIO_EXTILineConfig(GPIO_PortSourceGPIOA, GPIO_PinSource1|GPIO_PinSource2|GPIO_PinSource3|GPIO_PinSource4);
EXTI_InitStructure.EXTI_Line =EXTI_Line1|EXTI_Line2|EXTI_Line3|EXTI_Line4;
EXTI_InitStructure.EXTI_Mode =EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger =EXTI_Trigger_Falling；//下降沿
EXTI_InitStructure.EXTI_LineCmd = ENABLE;
EXTI_Init(&EXTI_InitStructure);
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);//配置为 1组。
NVIC_InitStructure.NVIC_IRQChannel =EXTI1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority =0;//先占优先级越小越高
NVIC_InitStructure.NVIC_IRQChannelSubPriority =0;//从优先级
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;//
NVIC_Init(&NVIC_InitStructure);
NVIC_InitStructure.NVIC_IRQChannel =EXTI2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority =1;
NVIC_InitStructure.NVIC_IRQChannelCmd =ENABLE;
NVIC_Init(&NVIC_InitStructure);
NVIC_InitStructure.NVIC_IRQChannel =EXTI3_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority =0;
NVIC_InitStructure.NVIC_IRQChannelCmd =ENABLE;
NVIC_Init(&NVIC_InitStructure);
NVIC_InitStructure.NVIC_IRQChannel =EXTI4_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority =1;
NVIC_InitStructure.NVIC_IRQChannelCmd =ENABLE;
NVIC_Init(&NVIC_InitStructure);
GPIO_SetBits(GPIOC,GPIO_Pin_2|GPIO_Pin_0|GPIO_Pin_1|GPIO_Pin_3);
while(1)
{
}
}
void EXTI1_IRQHandler(void)
{
if(EXTI_GetITStatus(EXTI_Line1) != RESET)
{
GPIO_WriteBit(GPIOC,GPIO_Pin_0,1-GPIO_ReadOutputDataBit(GPIOC,GPIO_Pin_0));//电平翻转
}
EXTI_ClearFlag(EXTI_Line1);//清标志位
}
void EXTI4_IRQHandler(void)
{
if(EXTI_GetITStatus(EXTI_Line4) != RESET)
{
GPIO_WriteBit(GPIOC,GPIO_Pin_3,1-GPIO_ReadOutputDataBit(GPIOC,GPIO_Pin_3));
}
EXTI_ClearFlag(EXTI_Line4);
}void EXTI2_IRQHandler(void)
{
if(EXTI_GetITStatus(EXTI_Line2) != RESET)
{
GPIO_WriteBit(GPIOC,GPIO_Pin_1,1-GPIO_ReadOutputDataBit(GPIOC,GPIO_Pin_1));
}
EXTI_ClearFlag(EXTI_Line2);
}void EXTI3_IRQHandler(void)
{
if(EXTI_GetITStatus(EXTI_Line3) != RESET)
{
GPIO_WriteBit(GPIOC,GPIO_Pin_2,1-GPIO_ReadOutputDataBit(GPIOC,GPIO_Pin_2));
}
EXTI_ClearFlag(EXTI_Line3);
}
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