170bdd104f
Large change that removes the duplicated MIT notice withe a spdx tag Signed-off-by: Thomas Ingleby <thomas.ingleby@intel.com>
131 lines
2.8 KiB
C
131 lines
2.8 KiB
C
/*
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* Author: Thomas Ingleby <thomas.c.ingleby@intel.com>
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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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* SPDX-License-Identifier: MIT
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*
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* Example usage: Toggles GPIO's 23 and 24 recursively. Press Ctrl+C to exit
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*
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*/
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/* standard headers */
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#include <signal.h>
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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/gpio.h"
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/* gpio declaration */
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#define GPIO_PIN_1 23
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#define GPIO_PIN_2 24
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volatile sig_atomic_t flag = 1;
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void
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sig_handler(int signum)
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{
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if (signum == SIGINT) {
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fprintf(stdout, "Exiting...\n");
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flag = 0;
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}
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}
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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_gpio_context gpio_1, gpio_2;
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/* install signal handler */
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signal(SIGINT, sig_handler);
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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_1 = mraa_gpio_init(GPIO_PIN_1);
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if (gpio_1 == NULL) {
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fprintf(stderr, "Failed to initialize GPIO %d\n", GPIO_PIN_1);
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mraa_deinit();
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return EXIT_FAILURE;
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}
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/* initialize GPIO pin */
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gpio_2 = mraa_gpio_init(GPIO_PIN_2);
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if (gpio_2 == NULL) {
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fprintf(stderr, "Failed to initialize GPIO %d\n", GPIO_PIN_2);
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mraa_deinit();
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return EXIT_FAILURE;
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}
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/* set GPIO to output */
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status = mraa_gpio_dir(gpio_1, MRAA_GPIO_OUT);
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if (status != MRAA_SUCCESS) {
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goto err_exit;
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}
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/* set GPIO to output */
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status = mraa_gpio_dir(gpio_2, MRAA_GPIO_OUT);
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if (status != MRAA_SUCCESS) {
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goto err_exit;
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}
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/* toggle both GPIO's */
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while (flag) {
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status = mraa_gpio_write(gpio_1, 1);
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if (status != MRAA_SUCCESS) {
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goto err_exit;
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}
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status = mraa_gpio_write(gpio_2, 0);
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if (status != MRAA_SUCCESS) {
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goto err_exit;
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}
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sleep(1);
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status = mraa_gpio_write(gpio_1, 0);
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if (status != MRAA_SUCCESS) {
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goto err_exit;
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}
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status = mraa_gpio_write(gpio_2, 1);
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if (status != MRAA_SUCCESS) {
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goto err_exit;
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}
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sleep(1);
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}
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/* release gpio's */
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status = mraa_gpio_close(gpio_1);
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if (status != MRAA_SUCCESS) {
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goto err_exit;
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}
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/* close GPIO */
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status = mraa_gpio_close(gpio_2);
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if (status != MRAA_SUCCESS) {
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goto err_exit;
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}
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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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