1 /* 2 * Author: Brendan Le Foll 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 27 #include "mraa.h" 28 29 static volatile int counter = 0; 30 static volatile int oldcounter = 0; 31 32 void 33 interrupt(void* args) 34 { 35 ++counter; 36 } 37 38 int 39 main() 40 { 41 mraa_init(); 42 mraa_gpio_context x; 43 44 x = mraa_gpio_init(6); 45 if (x == NULL) { 46 return 1; 47 } 48 49 mraa_gpio_dir(x, MRAA_GPIO_IN); 50 51 mraa_gpio_edge_t edge = MRAA_GPIO_EDGE_BOTH; 52 53 mraa_gpio_isr(x, edge, &interrupt, NULL); 54 55 for (;;) { 56 if (counter != oldcounter) { 57 fprintf(stdout, "timeout counter == %d\n", counter); 58 oldcounter = counter; 59 } 60 // got to relieve our poor CPU! 61 sleep(1); 62 } 63 64 mraa_gpio_close(x); 65 66 return MRAA_SUCCESS; 67 } 68
