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