1 /*
2 * Copyright (C) 2015 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 /*
18 * This is an example to flash a number of LED lights in a pattern.
19 * Connect your LEDs to appropriate GPIOs (as many as you like)
20 * then modify gpio[] and m_gpio[] to specify the pins.
21 */
22 #include <unistd.h>
23 #include <stdio.h>
24
25 #include <mraa.h>
26
main(int argc,char * argv[])27 int main(int argc, char* argv[]) {
28 const unsigned gpio[] = {0, 1, 2};
29 const int gpio_count = sizeof(gpio)/sizeof(*gpio);
30 mraa_gpio_context m_gpio[] = {NULL, NULL, NULL};
31
32 mraa_init();
33 for (int i = 0; i < gpio_count; i++) {
34 m_gpio[i] = mraa_gpio_init(gpio[i]);
35 if (!m_gpio[i]) {
36 fprintf(stderr, "Unable to initialize GPIO %d, invalid pin number?\n",
37 gpio[i]);
38 return 1;
39 }
40 mraa_gpio_dir(m_gpio[i], MRAA_GPIO_OUT);
41 }
42
43 for (int iterations = 0; iterations < 3; iterations++) {
44 for (int i = 0; i < gpio_count; i++) {
45 mraa_gpio_write(m_gpio[i], 1);
46 sleep(1);
47 }
48 for (int i = gpio_count-1; i >= 0; i--) {
49 mraa_gpio_write(m_gpio[i], 0);
50 sleep(1);
51 }
52 }
53
54 for (int i = 0; i < gpio_count; i++)
55 mraa_gpio_close(m_gpio[i]);
56 return 0;
57 }
58