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 <unistd.h> 26#include <signal.h> 27 28#include "mraa.hpp" 29 30int running = 0; 31 32void 33sig_handler(int signo) 34{ 35 if (signo == SIGINT) { 36 printf("closing PWM nicely\n"); 37 running = -1; 38 } 39} 40 41int 42main() 43{ 44 signal(SIGINT, sig_handler); 45 //! [Interesting] 46 mraa::Pwm* pwm; 47 48 pwm = new mraa::Pwm(3); 49 if (pwm == NULL) { 50 return MRAA_ERROR_UNSPECIFIED; 51 } 52 fprintf(stdout, "Cycling PWM on IO3 (pwm3) \n"); 53 pwm->enable(true); 54 55 float value = 0.0f; 56 while (running == 0) { 57 value = value + 0.01f; 58 pwm->write(value); 59 usleep(50000); 60 if (value >= 1.0f) { 61 value = 0.0f; 62 } 63 } 64 delete pwm; 65 //! [Interesting] 66 67 return MRAA_SUCCESS; 68} 69