Bela
Real-time, ultra-low-latency audio and sensor processing system for BeagleBone Black
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GPIOcontrol.h
1/*
2 * SimpleGPIO.h
3 *
4 * Copyright Derek Molloy, School of Electronic Engineering, Dublin City University
5 * www.derekmolloy.ie
6 *
7 * Based on Software by RidgeRun
8 * Copyright (c) 2011, RidgeRun
9 * All rights reserved.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed by the RidgeRun.
21 * 4. Neither the name of the RidgeRun nor the
22 * names of its contributors may be used to endorse or promote products
23 * derived from this software without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY RIDGERUN ''AS IS'' AND ANY
26 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
27 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
28 * DISCLAIMED. IN NO EVENT SHALL RIDGERUN BE LIABLE FOR ANY
29 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
30 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
31 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
32 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
33 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
34 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
35 */
36
37#ifndef SIMPLEGPIO_H_
38#define SIMPLEGPIO_H_
39
40#ifdef __cplusplus
41extern "C"
42{
43#endif
44 /****************************************************************
45 * Constants
46 ****************************************************************/
47
48#define SYSFS_GPIO_DIR "/sys/class/gpio"
49#define SYSFS_LED_DIR "/sys/class/leds"
50#define POLL_TIMEOUT (3 * 1000) /* 3 seconds */
51#define MAX_BUF 128
52
53enum PIN_DIRECTION{
54 INPUT_PIN=0,
55 OUTPUT_PIN=1
56};
57
58enum PIN_VALUE{
59 LOW=0,
60 HIGH=1
61};
62
63/****************************************************************
64 * gpio_functions
65 ****************************************************************/
66int gpio_setup(unsigned int gpio, int out_flag);
67int gpio_export(unsigned int gpio);
68int gpio_unexport(unsigned int gpio);
69int gpio_set_dir(unsigned int gpio, int out_flag);
70int gpio_set_value(unsigned int gpio, int value);
71int gpio_get_value(unsigned int gpio, unsigned int *value);
72int gpio_set_edge(unsigned int gpio, char *edge);
73int gpio_fd_open(unsigned int gpio, int writeFlag);
74int gpio_fd_close(int fd);
75int gpio_write(int fd, int value);
76int gpio_read(int fd, unsigned int *value);
77int gpio_dismiss(int fd, unsigned int gpio);
78
79int led_set_trigger(unsigned int lednum, const char *trigger);
80
81#ifdef __cplusplus
82}
83#endif
84
85#endif /* SIMPLEGPIO_H_ */
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