#include "stm32f10x.h"
u8 i,j=0;
void delay_ms(uint32_t ms)
{
uint32_t i_cnt,j_cnt;
for(i_cnt=0;i_cnt<3000;i_cnt++);
for(j_cnt=0;j_cnt<ms;j_cnt++);
}
int main(){
//GPIOA2配置
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_GPIOC,ENABLE);
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Pin=GPIO_Pin_2;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_IPU;
GPIO_Init(GPIOA,&GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin=GPIO_Pin_0|GPIO_Pin_1|GPIO_Pin_2|GPIO_Pin_3|GPIO_Pin_4|GPIO_Pin_5|GPIO_Pin_6|GPIO_Pin_7;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_Init(GPIOC,&GPIO_InitStructure);
//中断配置
//打开AFIO复用时钟
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE);
//关联中断线
GPIO_EXTILineConfig(GPIO_PortSourceGPIOA,GPIO_PinSource2);
//配置EXTI
EXTI_InitTypeDef EXTI_InitStructure;
EXTI_InitStructure.EXTI_Line=EXTI_Line2;
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;
EXTI_InitStructure.EXTI_LineCmd = ENABLE;
EXTI_Init(&EXTI_InitStructure);
//配置NVIC
NVIC_InitTypeDef NVIC_InitStructure;
NVIC_InitStructure.NVIC_IRQChannel = EXTI2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x02;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x02;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
GPIOC->BSRR=0xff;
while(1)
{
for(i=0;i<j;i++)
{
GPIOC->BRR=(1<<i);
}
}
}
void EXTI2_IRQHandler(void){
if(EXTI_GetITStatus(EXTI_Line2)!=RESET)
{
j++;
EXTI_ClearITPendingBit(EXTI_Line2);
}
} |
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