raspberrypi/gpio/key_light-interrupt.c
2020-09-10 13:23:23 +08:00

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/*
* raspberrypi GPIO key light
* 功能key等于1时亮的灯灭、灭的灯亮
*/
#include <wiringPi.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#define LIGHT 3 // 灯PIN引脚
#define KEY 4 // 按键PIN引脚
void buttonpressed(void);
int main()
{
if (-1 == wiringPiSetup()) {
exit(-1);
}
daemon(1, 1);
pinMode(LIGHT, OUTPUT); // 灯PIN输出模式
pinMode(KEY, INPUT); // 按键PIN输入模式
pullUpDnControl(KEY, PUD_DOWN); // 按键启用下拉电阻引脚电平拉到GND
//注册中断处理函数, INT_EDGE_RISING是高电平触发
if (0 > wiringPiISR(KEY, INT_EDGE_RISING, buttonpressed)) {
exit(-1);
}
while (1) ;
return 0;
}
//中断处理函数反转LED的电平
void buttonpressed(void)
{
//printf("%d\n", digitalRead(KEY));
delay(250); // 模拟人手按下开关的时间
int light_status = digitalRead(LIGHT); // 灯状态
int key_status = digitalRead(KEY); // 按键状态
if (key_status == 1) {
if (light_status == 0) {
digitalWrite(LIGHT, HIGH); // 开灯
return ;
}
if (light_status == 1) {
digitalWrite(LIGHT, LOW); // 关灯
return ;
}
}
}