Home | History | Annotate | Download | only in examples 
      1 /*
      2  * Author: Brendan Le Foll <brendan.le.foll (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 <stdio.h>
     26 #include <string.h>
     27 #include <unistd.h>
     28 
     29 #include "mraa/gpio.h"
     30 
     31 int
     32 main(int argc, char** argv)
     33 {
     34     mraa_platform_t platform = mraa_get_platform_type();
     35     mraa_gpio_context gpio, gpio_in = NULL;
     36     const char* board_name = mraa_get_platform_name();
     37     int ledstate = 0;
     38 
     39     switch (platform) {
     40         case MRAA_INTEL_GALILEO_GEN1:
     41             gpio = mraa_gpio_init_raw(3);
     42             break;
     43         case MRAA_INTEL_MINNOWBOARD_MAX:
     44             // there is no onboard LED that we can flash on the minnowboard max
     45             // but on the calamari lure pin 21 is an LED. If you don't have the
     46             // lure put an LED on pin 21
     47             gpio = mraa_gpio_init(21);
     48             break;
     49         default:
     50             gpio = mraa_gpio_init(13);
     51     }
     52 
     53     fprintf(stdout, "Welcome to libmraa\n Version: %s\n Running on %s\n", mraa_get_version(), board_name);
     54 
     55 
     56     if (gpio == NULL) {
     57         fprintf(stdout, "Could not initilaize gpio\n");
     58         return 1;
     59     }
     60 
     61     // on platforms with physical button use gpio_in
     62     if (platform == MRAA_INTEL_MINNOWBOARD_MAX) {
     63         gpio_in = mraa_gpio_init(14);
     64         if (gpio_in != NULL) {
     65             mraa_gpio_dir(gpio_in, MRAA_GPIO_IN);
     66             // S1 on minnowboardmax's calamari lure maps to pin 14, SW1 != S1
     67             fprintf(stdout, "Press and hold S1 to stop, Press SW1 to shutdown!\n");
     68         }
     69     }
     70 
     71     mraa_gpio_dir(gpio, MRAA_GPIO_OUT);
     72 
     73     for (;;) {
     74         if (gpio_in != NULL && mraa_gpio_read(gpio_in) == 0) {
     75             return 0;
     76         }
     77         ledstate = !ledstate;
     78         mraa_gpio_write(gpio, !ledstate);
     79         sleep(1);
     80     }
     81 
     82     return 0;
     83 }
     84