SetGpioAsOutput.c

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#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>

#include "../Sysfs/Sysfs.h"
#include "../config.h"

int SetGpioAsOutput(int Pin)
 {
 int fd;
 
 snprintf(path, DIRECTION_MAX, "/sys/class/gpio/gpio%d/direction", Pin);
 fd = open(path, O_WRONLY);
 if (fd == -1 ) 
  {
  fprintf(stderr, "201309231650 Failed to open gpio direction for writing, are you root?\n");
  return(-1);
  }

 if ( write(fd, "out", 3) == -1 )
  {
  fprintf(stderr, "201309210050 Failed to set direction, are you root?\n");
  return(-1);
  }

 close(fd);
 return(0);
 }