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