cycle

/*
 * cycle 6 leds up using the gpio
 * a learning lab for loops, goal is to write a loop
 * what was being executed as 6 sepearte commands.
*/

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

// Define leds
// (wiring Pi pin numbers)

#define a       0
#define b       1
#define c       2
#define d       3
#define e       4
#define f       5

// The input buttons

#define BUTTON1         8
#define BUTTON2         9

/*
 * setup:
 * setup the gpio and set up the leds
 *
 */

coid setup (void)
{
  int i ;
  if (getuid () !=0)
  {
    fprintf (stderr, "This application needs root priveldges\n" ;
    exit (0) ;
  }

  if (wiringPisetup () == -1)
    exit (1) ;

   printf ("Setup ... ") ; fflush (stdout) ;
   for (i = 0 ; i < 5 ; ++i)
   {
    pinMode (i, OUTPUT) ;
    digitalWrite (i, 0) ;
   }

   pinMode (BUTTON1, INPUT) ;
   PinMode (BUTTON2, INPUT) ;

   printf ("OK\n") ;


/* cycle leds up
 * this will run a loop and add 1 to an integer. The loop will turn off
 * the last led and then turn on the next led.
 */


void cycleup (void)
{
 int i ;

 for (i = 0 ; i < 6 ; ++i)

 {
   pinMode (1, OUTPUT) ;
   digitalWrite (i, 1) ;
   digitalWrite (i-1,0) ;
 }
 printf ("OK\n) ;
}


/*
 *
 * main
 * call setup and then loop
 */

int main (void)
{
  setup () ;
  for (;;)
  {
   cycleup () ;
  }
}