/*
	Copyright (c) 2016 CurlyMo <curlymoo1@gmail.com>

  This Source Code Form is subject to the terms of the Mozilla Public
  License, v. 2.0. If a copy of the MPL was not distributed with this
  file, You can obtain one at http://mozilla.org/MPL/2.0/.
*/

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <unistd.h>

#include "wiringx.h"

int main() {

	if(wiringXSetup("raspberrypi3", NULL) == -1) {
		wiringXGC();
		return -1;
	}

	pinMode(9, PINMODE_OUTPUT);
	digitalWrite(9, HIGH);
	pinMode(9, PINMODE_INPUT);
	pinMode(8, PINMODE_OUTPUT);

	while(1) {
		// start bit
		digitalWrite(8, HIGH);
		usleep(18000);
		digitalWrite(8, LOW);
		long int cycles = 0;
		int last_state = digitalRead(9);
		// ignore 2 bits: reaction on command + "official" start bit
		int bit = -2;
		char data[5];
		memset(&data[0], 0, 5);
		while (cycles < 100000) {
			cycles++;
			if (last_state == digitalRead(9))
				continue;
			if (last_state == 1) {
				if (bit >= 0) {
					if (cycles>400) {
						printf("1");
						data[bit / 8] |= 1 << 7 - (bit % 8);
					} else
						printf("0");
					if ((bit+1) % 8 == 0)
						printf(" ");
				}
				bit++;
			}
			cycles = 0;
			last_state = 1-last_state;
		}
		if ((bit == 40) && ((data[0]+data[1]+data[2]+data[3]-data[4]) % 255 == 0))
			printf(" %f %f", data[0] + data[1]/256., data[2] + data[3]/256.);
		printf("\n\n");
		sleep(2);
	}
}