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
41 extern "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 
53 enum PIN_DIRECTION{
54  INPUT_PIN=0,
55  OUTPUT_PIN=1
56 };
57 
58 enum PIN_VALUE{
59  LOW=0,
60  HIGH=1
61 };
62 
63 /****************************************************************
64  * gpio_functions
65  ****************************************************************/
66 int gpio_setup(unsigned int gpio, int out_flag);
67 int gpio_export(unsigned int gpio);
68 int gpio_unexport(unsigned int gpio);
69 int gpio_set_dir(unsigned int gpio, int out_flag);
70 int gpio_set_value(unsigned int gpio, int value);
71 int gpio_get_value(unsigned int gpio, unsigned int *value);
72 int gpio_set_edge(unsigned int gpio, char *edge);
73 int gpio_fd_open(unsigned int gpio, int writeFlag);
74 int gpio_fd_close(int fd);
75 int gpio_write(int fd, int value);
76 int gpio_read(int fd, unsigned int *value);
77 int gpio_dismiss(int fd, unsigned int gpio);
78 
79 int led_set_trigger(unsigned int lednum, const char *trigger);
80 
81 #ifdef __cplusplus
82 }
83 #endif
84 
85 #endif /* SIMPLEGPIO_H_ */