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

#include

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);

}