806c17f664
Since the LEDs are initialized based on index, modify the USER_LED to index 0. Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
109 lines
3.1 KiB
C
109 lines
3.1 KiB
C
/*
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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 <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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/* mraa header */
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#include "mraa/led.h"
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/* LED name */
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#define USER_LED 0
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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_t status = MRAA_SUCCESS;
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mraa_led_context led;
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int val;
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/* initialize mraa for the platform (not needed most of the time) */
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mraa_init();
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//! [Interesting]
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/* initialize LED */
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led = mraa_led_init(USER_LED);
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if (led == NULL) {
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fprintf(stderr, "Failed to initialize LED\n");
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mraa_deinit();
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return EXIT_FAILURE;
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}
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/* read maximum brightness */
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val = mraa_led_read_max_brightness(led);
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fprintf(stdout, "maximum brightness value for LED is: %d\n", val);
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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 = mraa_led_set_brightness(led, val);
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if (status != MRAA_SUCCESS) {
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fprintf(stderr, "unable to set LED brightness\n");
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goto err_exit;
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}
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/* sleep for 5 seconds */
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sleep(5);
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/* set LED trigger to heartbeat */
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status = mraa_led_set_trigger(led, LED_TRIGGER);
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if (status != MRAA_SUCCESS) {
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fprintf(stderr, "unable to set LED trigger to: heartbeat\n");
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goto err_exit;
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}
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fprintf(stdout, "LED trigger set to: heartbeat\n");
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/* close LED */
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mraa_led_close(led);
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//! [Interesting]
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/* deinitialize mraa for the platform (not needed most of the times) */
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mraa_deinit();
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return EXIT_SUCCESS;
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err_exit:
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mraa_result_print(status);
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/* deinitialize mraa for the platform (not needed most of the times) */
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mraa_deinit();
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return EXIT_FAILURE;
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}
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