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https://git.kernel.org/pub/scm/libs/libgpiod/libgpiod.git
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4254100d89
Add examples for use cases drawn from the tools. Signed-off-by: Kent Gibson <warthog618@gmail.com> Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
41 lines
978 B
C
41 lines
978 B
C
// SPDX-License-Identifier: GPL-2.0-or-later
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// SPDX-FileCopyrightText: 2023 Kent Gibson <warthog618@gmail.com>
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/* Minimal example of reading the info for a chip. */
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#include <errno.h>
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#include <gpiod.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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int main(void)
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{
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/* Example configuration - customize to suit your situation. */
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static const char *const chip_path = "/dev/gpiochip0";
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struct gpiod_chip_info *info;
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struct gpiod_chip *chip;
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chip = gpiod_chip_open(chip_path);
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if (!chip) {
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fprintf(stderr, "failed to open chip: %s\n", strerror(errno));
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return EXIT_FAILURE;
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}
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info = gpiod_chip_get_info(chip);
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if (!info) {
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fprintf(stderr, "failed to read info: %s\n", strerror(errno));
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return EXIT_FAILURE;
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}
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printf("%s [%s] (%zu lines)\n", gpiod_chip_info_get_name(info),
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gpiod_chip_info_get_label(info),
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gpiod_chip_info_get_num_lines(info));
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gpiod_chip_info_free(info);
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gpiod_chip_close(chip);
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return EXIT_SUCCESS;
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}
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