counter.c

#include "contiki.h"
#include "dev/button-sensor.h"
#include <stdio.h>

PROCESS(blink_process, "Blink");
AUTOSTART_PROCESSES(&blink_process);

PROCESS_THREAD(blink_process,ev,data){
	PROCESS_BEGIN();
	SENSORS_ACTIVATE(button_sensor);

	static int value = 0;

	while(1){
		PROCESS_WAIT_EVENT();
		if(ev == sensors_event && data == &button_sensor){
			printf("Button press event :\n");
			value = value +1;
		}
		printf("after an event \n");
		printf("value=%d\n", value);
	}
	PROCESS_END();
}