3 * This tests the hardware PWM channel.
5 * Copyright (c) 2012-2013 Gordon Henderson. <projects@drogon.net>
6 ***********************************************************************
7 * This file is part of wiringPi:
8 * https://projects.drogon.net/raspberry-pi/wiringpi/
10 * wiringPi is free software: you can redistribute it and/or modify
11 * it under the terms of the GNU Lesser General Public License as published by
12 * the Free Software Foundation, either version 3 of the License, or
13 * (at your option) any later version.
15 * wiringPi is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU Lesser General Public License for more details.
20 * You should have received a copy of the GNU Lesser General Public License
21 * along with wiringPi. If not, see <http://www.gnu.org/licenses/>.
22 ***********************************************************************
35 printf ("Raspberry Pi wiringPi PWM test program\n") ;
37 if (wiringPiSetup () == -1)
40 pinMode (1, PWM_OUTPUT) ;
44 for (bright = 0 ; bright < 1024 ; ++bright)
46 pwmWrite (1, bright) ;
50 for (bright = 1023 ; bright >= 0 ; --bright)
52 pwmWrite (1, bright) ;