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82 lines
2.1 KiB
82 lines
2.1 KiB
/* |
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* okLed.c: |
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* Make the OK LED on the Pi Pulsate... |
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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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* Copyright (c) 2012-2013 Gordon Henderson. <projects@drogon.net> |
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*********************************************************************** |
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* This file is part of wiringPi: |
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* https://projects.drogon.net/raspberry-pi/wiringpi/ |
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* |
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* wiringPi is free software: you can redistribute it and/or modify |
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* it under the terms of the GNU Lesser General Public License as published by |
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* the Free Software Foundation, either version 3 of the License, or |
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* (at your option) any later version. |
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* |
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* wiringPi is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public License |
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* along with wiringPi. If not, see <http://www.gnu.org/licenses/>. |
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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 <math.h> |
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#include <wiringPi.h> |
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#include <softPwm.h> |
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// The OK/Act LED is connected to BCM_GPIO pin 16 |
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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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wiringPiSetupGpio () ; |
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// Change the trigger on the OK/Act LED to "none" |
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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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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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