obsidian-vault-/Linux/Programm/GPIO Kernel control.md

#include <libgpiod>

void main() {
    struct gpiod_chip *chip;
    struct gpiod_line *line;
    int req, value;

    chip = gpiod_chip_open("/dev/gpiochip0");
    if (!chip)
        return -1;

    line = gpiod_chip_get_line(chip, 3);
    if (!line) {
        gpiod_chip_close(chip);
        return -1;
    }

    req = gpiod_line_request_input(line, "gpio_state");
    if (req) {
        gpiod_chip_close(chip);
        return -1;
    }

    value = gpiod_line_get_value(line);

    printf("GPIO value is: %d\n", value);

    gpiod_chip_close(chip);
}