l_tika.c

# command

# pi, gpio, wiringPi mapping confirm
# $ gpio readall

# use wiringPi pin number
# $ gpio mode [pin no] out
# $ gpio write [pin no] 1
# $ gpio write [pin no] 0

# use pi pin number
# $ gpio mode -1 [pin no] out
# $ gpio write -1 [pin no] 1
# $ gpio write -1 [pin no] 0

# use gpio -g pin number
# $ gpio mode -g [pin no] out
# $ gpio write -g [pin no] 1
# $ gpio write -g [pin no] out

# https://tool-lab.com/make/raspberrypi-startup-24/


####################################################
# program


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

#define WRITE_PIN 8

void main()
{
  if(wiringPiSetup() == -1){
    printf("error wiringPi setup\n");
    return;
  }

  pinMode(WRITE_PIN, OUTPUT);

  while(1) {
    digitalWrite(WRITE_PIN, 0);  //LED off
    delay(1000);    //wait 1000ms

    digitalWrite(WRITE_PIN, 1);  //LED on
    delay(1000);    //wait 1000ms
  }

  return;
}