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