//Causes Arduino.h to be disabled when compiling from Arduino IDE
#define Skip_Arduino

#ifdef Skip_Arduino
#define Arduino_h
/*  Arduino.h is always automaticaly included if omited, but if we include 
 *  it manualy after Arduino_h is defined it will be disabled.
 */
#include <Arduino.h>
#endif

#include <stdint.h>
#include <avr/io.h>

#include "IOBitAccess.h"

#define SNSK B2
#define SNS B3

int main() {
	while (true) {
		//discharge reference and sense capacitors
		DDR(SNSK) = 1;
		DDR(SNS) = 1;
		__builtin_avr_delay_cycles(20);
	
		while (PIN(SNSK) == 0) {
			//disconnect reference capacitor
			DDR(SNS) = 0;

			//charge sense capacitor, then disconnect
			PORT(SNSK) = 1;
			DDR(SNSK) = 1;
			__builtin_avr_delay_cycles(20);
			DDR(SNSK) = 0;
			PORT(SNSK) = 0;

			//allow current to flow from sense to reference capacitor
			DDR(SNS) = 1;
			__builtin_avr_delay_cycles(20);
		}
	}
}