95 lines
2.7 KiB
C
95 lines
2.7 KiB
C
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/*
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* Author: Brendan Le Foll
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* Contributors: Alex Tereschenko <alext.mkrs@gmail.com>
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* Contributors: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
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* Copyright (c) 2014 Intel Corporation.
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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: Configures GPIO pin for interrupt and waits 30 seconds for the isr to trigger
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*
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*/
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/* standard headers */
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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/gpio.h"
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#define GPIO_PIN 6
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void
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int_handler(void* args)
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{
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fprintf(stdout, "ISR triggered\n");
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}
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int
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main()
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{
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mraa_result_t status = MRAA_SUCCESS;
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mraa_gpio_context gpio;
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/* initialize mraa for the platform (not needed most of the times) */
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mraa_init();
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//! [Interesting]
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/* initialize GPIO pin */
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gpio = mraa_gpio_init(GPIO_PIN);
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if (gpio == NULL) {
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fprintf(stderr, "Failed to initialize GPIO %d\n", GPIO_PIN);
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mraa_deinit();
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return EXIT_FAILURE;
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}
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/* set GPIO to input */
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status = mraa_gpio_dir(gpio, MRAA_GPIO_IN);
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if (status != MRAA_SUCCESS) {
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goto err_exit;
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}
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/* configure ISR for GPIO */
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status = mraa_gpio_isr(gpio, MRAA_GPIO_EDGE_BOTH, &int_handler, NULL);
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if (status != MRAA_SUCCESS) {
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goto err_exit;
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}
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/* wait 30 seconds isr trigger */
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sleep(30);
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/* close GPIO */
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mraa_gpio_close(gpio);
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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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