led_toggle.c

#include <asf.h>

static void config_led(void)
{
	struct port_config pin_conf;
	port_get_config_defaults(&pin_conf);
	
	//BUTTON
	pin_conf.direction = PORT_PIN_DIR_INPUT;
	pin_conf.input_pull = PORT_PIN_PULL_UP;
	port_pin_set_config(BUTTON_0_PIN, &pin_conf);
	
	//LED
	pin_conf.direction  = PORT_PIN_DIR_OUTPUT;
	port_pin_set_config(LED_0_PIN, &pin_conf);
	// TURN OFF
	port_pin_set_output_level(LED_0_PIN, LED_0_INACTIVE);
}

int main(void)
{
	system_init();
	config_led();

	while(true)
	{
		bool button_state = port_pin_get_input_level(BUTTON_0_PIN);
		port_pin_set_output_level(LED_0_PIN, !button_state);
	}
}