87 lines
2.5 KiB
C++
87 lines
2.5 KiB
C++
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/*
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* Author: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
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* Copyright (c) 2018, Linaro Ltd.
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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* Example usage: Reads maximum brightness value for user led and turns it
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* on/off depending on current state. Then sets led trigger
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* to heartbeat.
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*
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*/
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/* standard headers */
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#include <iostream>
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#include <stdlib.h>
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#include <unistd.h>
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/* mraa headers */
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#include "mraa/common.hpp"
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#include "mraa/led.hpp"
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/* LED name */
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#define USER_LED "user1"
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/* trigger type */
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#define LED_TRIGGER "heartbeat"
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int
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main(void)
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{
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mraa::Result status;
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int val;
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//! [Interesting]
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/* initialize user1 led */
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mraa::Led led(USER_LED);
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/* read maximum brightness */
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val = led.readMaxBrightness();
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std::cout << "maximum brightness value for user1 led is: %d" << val << std::endl;
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if (val >= 1) {
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val = 0;
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} else {
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/* never reached mostly */
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val = 1;
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}
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/* turn led on/off depending on max_brightness value */
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status = led.setBrightness(val);
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if (status != mraa::SUCCESS) {
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printError(status);
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return EXIT_FAILURE;
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}
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/* sleep for 5 seconds */
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usleep(5000000);
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/* set led trigger to heartbeat */
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status = led.trigger(LED_TRIGGER);
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if (status != mraa::SUCCESS) {
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printError(status);
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return EXIT_FAILURE;
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}
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std::cout << "led trigger set to: heartbeat" << std::endl;
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//! [Interesting]
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return EXIT_SUCCESS;
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}
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