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      1 /*
      2  * Author: Thomas Ingleby <thomas.c.ingleby (at) 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 <unistd.h>
     26 #include <signal.h>
     27 #include <stdint.h>
     28 
     29 #include "mraa.hpp"
     30 
     31 int running = 0;
     32 
     33 void
     34 sig_handler(int signo)
     35 {
     36     if (signo == SIGINT) {
     37         printf("closing spi nicely\n");
     38         running = -1;
     39     }
     40 }
     41 
     42 int
     43 main()
     44 {
     45     signal(SIGINT, sig_handler);
     46 
     47     //! [Interesting]
     48     mraa::Spi* spi;
     49 
     50     spi = new mraa::Spi(0);
     51 
     52     uint8_t data[] = { 0x00, 100 };
     53     uint8_t rxBuf[2];
     54     uint8_t* recv;
     55     while (running == 0) {
     56         int i;
     57         for (i = 90; i < 130; i++) {
     58             data[1] = i;
     59             recv = spi->write(data, 2);
     60             printf("Writing -%i", i);
     61             if (recv) {
     62                 printf("RECIVED-%i-%i\n", recv[0], recv[1]);
     63                 free(recv);
     64             }
     65             usleep(100000);
     66         }
     67         for (i = 130; i > 90; i--) {
     68             data[1] = i;
     69             if (spi->transfer(data, rxBuf, 2) == mraa::SUCCESS) {
     70                 printf("Writing -%i", i);
     71                 printf("RECIVED-%i-%i\n", rxBuf[0], rxBuf[1]);
     72             }
     73             usleep(100000);
     74         }
     75     }
     76     delete spi;
     77     //! [Interesting]
     78 
     79     return mraa::SUCCESS;
     80 }
     81