Statistics
| Branch: | Revision:

ddr4s / fw / wiringPi / examples / pwm.c @ 32:cadb9025f1e0

History | View | Annotate | Download (1.51 KB)

1
/*
2
 * pwm.c:
3
 *        This tests the hardware PWM channel.
4
 *
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/
9
 *
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.
14
 *
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.
19
 *
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
 ***********************************************************************
23
 */
24

    
25
#include <wiringPi.h>
26

    
27
#include <stdio.h>
28
#include <stdlib.h>
29
#include <stdint.h>
30

    
31
int main (void)
32
{
33
  int bright ;
34

    
35
  printf ("Raspberry Pi wiringPi PWM test program\n") ;
36

    
37
  if (wiringPiSetup () == -1)
38
    exit (1) ;
39

    
40
  pinMode (1, PWM_OUTPUT) ;
41

    
42
  for (;;)
43
  {
44
    for (bright = 0 ; bright < 1024 ; ++bright)
45
    {
46
      pwmWrite (1, bright) ;
47
      delay (1) ;
48
    }
49

    
50
    for (bright = 1023 ; bright >= 0 ; --bright)
51
    {
52
      pwmWrite (1, bright) ;
53
      delay (1) ;
54
    }
55
  }
56

    
57
  return 0 ;
58
}