Statistics
| Branch: | Revision:

ddr4s / fw / wiringPi / examples / q2w / button.c @ 32:cadb9025f1e0

History | View | Annotate | Download (1.75 KB)

1
/*
2
 * button.c:
3
 *        Simple button test for the Quick2Wire interface board.
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 <stdio.h>
26
#include <wiringPi.h>
27

    
28
#define        BUTTON        0
29
#define        LED1        1
30
#define        LED2        7
31

    
32
int main (void)
33
{
34

    
35
// Enable the on-goard GPIO
36

    
37
  wiringPiSetup () ;
38

    
39
  printf ("Raspberry Pi - Quick2Wire Mainboard Button & LED Test\n") ;
40

    
41
  pinMode (BUTTON, INPUT) ;
42
  pinMode (LED1, OUTPUT) ;
43
  pinMode (LED2, OUTPUT) ;
44

    
45
  digitalWrite (LED1, HIGH) ;                // On-board LED on
46
  digitalWrite (LED2, LOW) ;                // 2nd LED off
47

    
48
  for (;;)
49
  {
50
    if (digitalRead (BUTTON) == HIGH)        // Swap LED states
51
    {
52
      digitalWrite (LED1, LOW) ;
53
      digitalWrite (LED2, HIGH) ;
54
      while (digitalRead (BUTTON) == HIGH)
55
        delay (1) ;
56
      digitalWrite (LED1, HIGH) ;
57
      digitalWrite (LED2, LOW) ;
58
    }
59
    delay (1) ;
60
  }
61

    
62
  return 0 ;
63
}