demoLibgpiod.c

#include <stdio.h>
#include <unistd.h>
#include <gpiod.h>

int main(int argc, char *argv[])
{
	struct gpiod_chip *output_chip;
	struct gpiod_line *output_line;
	int line_value;

	/* open /dev/gpiochip0 */
	output_chip = gpiod_chip_open_by_number(0);
	
	/* find BLUE_LED pin */
	output_line = gpiod_chip_find_line(output_chip, "BLUE_LED");

	/* config as output and set a description */
	gpiod_line_request_output(output_line, "embarcadosDemo",
				  GPIOD_LINE_ACTIVE_STATE_HIGH);

	while (1) {
		line_value = !line_value;
		gpiod_line_set_value(output_line, line_value);
		sleep(1);
	}
	
	return 0;
}