1 /*
2 * Author: Thomas Ingleby <thomas.c.ingleby@intel.com>
3 * Copyright (c) 2014 Intel Corporation.
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining
6 * a copy of this software and associated documentation files (the
7 * "Software"), to deal in the Software without restriction, including
8 * without limitation the rights to use, copy, modify, merge, publish,
9 * distribute, sublicense, and/or sell copies of the Software, and to
10 * permit persons to whom the Software is furnished to do so, subject to
11 * the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be
14 * included in all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
17 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
18 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
19 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
20 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
21 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
22 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
23 */
24
25 #include "mraa.h"
26 #include <unistd.h>
27 #include <stdint.h>
28
29 int
main(int argc,char ** argv)30 main(int argc, char** argv)
31 {
32 mraa_init();
33 //! [Interesting]
34 mraa_spi_context spi;
35 spi = mraa_spi_init(0);
36 unsigned int response = 0;
37 printf("Hello, SPI initialised\n");
38 uint8_t data[] = { 0x00, 100 };
39 uint8_t* recv;
40 while (1) {
41 int i;
42 for (i = 90; i < 130; i++) {
43 data[1] = i;
44 recv = mraa_spi_write_buf(spi, data, 2);
45 printf("Writing -%i", i);
46 printf("RECIVED-%i-%i\n", recv[0], recv[1]);
47 usleep(100000);
48 }
49 for (i = 130; i > 90; i--) {
50 data[1] = i;
51 recv = mraa_spi_write_buf(spi, data, 2);
52 printf("Writing -%i", i);
53 printf("RECIVED-%i-%i\n", recv[0], recv[1]);
54 usleep(100000);
55 }
56 }
57 //! [Interesting]
58 }
59