blob: 02f0b2274b17697ca9ac84aa3d16b1d6c8b9ae9f [file] [log] [blame]
/*
* okLed:
* Make the OK LED on the Pi Pulsate...
* Copyright (c) 2012 gordon Henderson, but please Share and Enjoy!
*
* Originally posted to the Raspberry Pi forums:
* http://www.raspberrypi.org/phpBB3/viewtopic.php?p=162581#p162581
*
* Compile this and store it somewhere, then kick it off at boot time
* e.g. by putting it in /etc/rc.local and running it in the
* background &
*
*/
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include <math.h>
#include <wiringPi.h>
#include <softPwm.h>
#define OK_LED 16
int main ()
{
int fd, i ;
if ((fd = open ("/sys/class/leds/led0/trigger", O_RDWR)) < 0)
{
fprintf (stderr, "Unable to change LED trigger: %s\n", strerror (errno)) ;
return 1 ;
}
write (fd, "none\n", 5) ;
close (fd) ;
if (wiringPiSetupGpio () < 0)
{
fprintf (stderr, "Unable to setup GPIO: %s\n", strerror (errno)) ;
return 1 ;
}
softPwmCreate (OK_LED, 0, 100) ;
for (;;)
{
for (i = 0 ; i <= 100 ; ++i)
{
softPwmWrite (OK_LED, i) ;
delay (10) ;
}
delay (50) ;
for (i = 100 ; i >= 0 ; --i)
{
softPwmWrite (OK_LED, i) ;
delay (10) ;
}
delay (10) ;
}
return 0 ;
}