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- /*
- * 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 <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 ;
- }
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