树梅派学习 8. 轻触按键试验

原理图：

接线图：

实体接线图：

代码：

#include <wiringPi.h>
#include <stdio.h>

#define BtnPin      0
#define Gpin        1
#define Rpin        2

void LED(char* color)
{
    pinMode(Gpin, OUTPUT);
    pinMode(Rpin, OUTPUT);
    if (color == "RED")
    {
        digitalWrite(Rpin, HIGH);
        digitalWrite(Gpin, LOW);
    }
    else if (color == "GREEN")
    {
        digitalWrite(Rpin, LOW);
        digitalWrite(Gpin, HIGH);
    }
    else
        printf("LED Error");
}

int main(void)
{
    if(wiringPiSetup() == -1){ //when initialize wiring failed,print messageto screen
        printf("setup wiringPi failed !");
        return 1; 
    }

    pinMode(BtnPin, INPUT);
    LED("GREEN");

    while(1){
        if(0 == digitalRead(BtnPin)){
            delay(10);
            if(0 == digitalRead(BtnPin)){
                LED("RED"); 
                printf("Button is pressed\n");  
            }
        }
        else if(1 == digitalRead(BtnPin)){
            delay(10);
            if(1 == digitalRead(BtnPin)){
                while(!digitalRead(BtnPin));
                LED("GREEN");
            }
        }
    }
    return 0;
}

编译运行：

gcc button.c -o button -lwiringPi -lpthread
./button