/* * okLed.c: * Make the OK LED on the Pi Pulsate... * * 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 & * * Copyright (c) 2012-2013 Gordon Henderson. *********************************************************************** * This file is part of wiringPi: * https://projects.drogon.net/raspberry-pi/wiringpi/ * * wiringPi is free software: you can redistribute it and/or modify * it under the terms of the GNU Lesser General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * wiringPi is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public License * along with wiringPi. If not, see . *********************************************************************** */ #include #include #include #include #include #include #include #include #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 ; }