wiringpi-test.c

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

#define BUTTON1 2
#define BUTTON2 3
#define BUTTON3 4

int main(void) {
  
  if (wiringPiSetupGpio() == -1) return 1;

  pinMode(BUTTON1,INPUT);
  pinMode(BUTTON2,INPUT);
  pinMode(BUTTON3,INPUT);
  while(1) {
    if (digitalRead(BUTTON1) == 0) {
      printf("%s\n", "BUTTON1");
    }
    if (digitalRead(BUTTON2) == 0) {
      printf("%s\n", "BUTTON2");
    }
    if (digitalRead(BUTTON3) == 0) {
      printf("%s\n", "BUTTON3");
    }
    delay(100);
  }
  return 0;
}