树莓派的helloworld

#include <stdio.h>
#include <wiringPi.h>  
int main(int argc, char **argv) {
    //初始化wiringPi
    wiringPiSetup();
    
    //设置IO口模式
    //输入:INPUT
    //输出:OUTPUT
    pinMode(0, OUTPUT);
    //读IO口
    //digitalRead(io)
    //写IO口
    //digitalWrite(io, flag)
    //flag
    //高电平:HIGH
    //低电平:LOW
    //闪烁
    int i = HIGH;
    for(;;) {
        i = (i == HIGH) ? LOW : HIGH;
        //置引脚电平
        digitalWrite(0, i);
        //延时
        delay(500);
    }
    return 0;
}

gcc test.c -o test -lwiringPi