#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/stat.h>
#include <string.h>
#define SW_DIR_PATH      "/sys/class/gpio/gpio248/direction"

int configure_pins();
int pinunexport();
int iniciar0();
int iniciar1();
void close_fd(int);
int ok;

int main(int argc, char *argv[]){
    int fd;
    configure_pins();
    printf("Pinos configurados como Saida\n");
    iniciar0();
    usleep(10000);

    do{

      iniciar1();

        }while(ok = 1);

        if (ok = 0){

        pinunexport();
        printf("Pinos configurados como inutilizavél no momento, encerrar programa\n");
        return EXIT_FAILURE;
}
        ok = 0;
        return EXIT_SUCCESS;
    }



int configure_pins(){
    int fd;
    int ok;

    fd = open("/sys/class/gpio/export", O_WRONLY);
    write(fd, "250", 3);
    close(fd);

    fd = open("/sys/class/gpio/gpio250/direction", O_WRONLY);
    write(fd, "out", 3);
    close(fd);

    fd = open("/sys/class/gpio/export", O_WRONLY);
    write(fd, "248", 3);
    close(fd);

    fd = open("/sys/class/gpio/gpio248/direction", O_WRONLY);
    write(fd, "out", 3);
    close(fd);

    fd = open("/sys/class/gpio/export", O_WRONLY);
    write(fd, "173", 3);
    close(fd);

    fd = open("/sys/class/gpio/gpio173/direction", O_WRONLY);
    write(fd, "out", 3);
    close(fd);

    fd = open("/sys/class/gpio/export", O_WRONLY);
    write(fd, "172", 3);
    close(fd);

    fd = open("/sys/class/gpio/gpio172/direction", O_WRONLY);
    write(fd, "out", 3);
    close(fd);

    ok = 1;

    return EXIT_SUCCESS;

}

int pinunexport(){
int fd;
   if(fd = open(SW_DIR_PATH, O_WRONLY) <=0){
        perror("Não é possível abrir o arquivo de direção para o PIN \n");
        ok = 0;
        return EXIT_FAILURE;
    }

        else {
fd = open("/sys/class/gpio/unexport", O_WRONLY);
    write(fd, "250", 3);
    close(fd);

fd = open("/sys/class/gpio/unexport", O_WRONLY);
    write(fd, "248", 3);
    close(fd);

fd = open("/sys/class/gpio/unexport", O_WRONLY);
    write(fd, "173", 3);
    close(fd);

fd = open("/sys/class/gpio/unexport", O_WRONLY);
    write(fd, "172", 3);
    close(fd);
  }
    return 0;
}

int iniciar0(){
    int fd;
        fd = open("/sys/class/gpio/gpio250/value", O_WRONLY | O_SYNC);
        write(fd, "0", 1);
        close(fd);
        fd = open("/sys/class/gpio/gpio248/value", O_WRONLY | O_SYNC);
        write(fd, "0", 1);
        close(fd);
        fd = open("/sys/class/gpio/gpio173/value", O_WRONLY | O_SYNC);
        write(fd, "0", 1);
        close(fd);
        fd = open("/sys/class/gpio/gpio172/value", O_WRONLY | O_SYNC);
        write(fd, "0", 1);
        close(fd);
}

int iniciar1(){
    int fd;
        fd = open("/sys/class/gpio/gpio250/value", O_WRONLY | O_SYNC);
        write(fd, "1", 1);
        close(fd);
        fd = open("/sys/class/gpio/gpio248/value", O_WRONLY | O_SYNC);
        write(fd, "1", 1);
        close(fd);
        fd = open("/sys/class/gpio/gpio173/value", O_WRONLY | O_SYNC);
        write(fd, "1", 1);
        close(fd);
        fd = open("/sys/class/gpio/gpio172/value", O_WRONLY | O_SYNC);
        write(fd, "1", 1);
        close(fd);
}