#include <EEPROM.h>

// decode_bpsk_data
// INPUT/OUTPUT VALUES
// RAW DATA (DEC)             248, 84, 254, 82, 38,  194
// MIRRORED RAW DATA (DEC)    31,  42, 127, 74, 100, 67 
// OUTPUT DATA BYTES         [11,  2,  20,  26, 0,   59]   key = 20 

unsigned char b0 = 248;   // raw data bytes
unsigned char b1 = 84;
unsigned char b2 = 254;
unsigned char b3 = 82;
unsigned char b4 = 38;
unsigned char b5 = 194;

unsigned char bm0;        // mirror raw data bytes
unsigned char bm1;
unsigned char bm2;
unsigned char bm3;
unsigned char bm4;
unsigned char bm5;

unsigned char out0;       // ??
unsigned char out1;       // command  (should be 2)
unsigned char out2;       // key
unsigned char out3;       // sekce 
unsigned char out4;       // checksum
unsigned char out5;       // append???

unsigned char sekce;
unsigned char command;

unsigned char master_key = 107;   //master key
unsigned char key;                // vypocitany key po mirroru b2

int s1 = 8;                // port zapnuti sekce 
int in = 0;                 // cteni hodnot
int address = 0;          // adresa v eeprom kde je ulozeno cislo sekce
byte value = 26;                 // hodnota eeprom
int val;


void setup() 
{
Serial.begin(9600);
pinMode(8, OUTPUT);  
attachInterrupt(0, hrana, RISING);                  //

/*byte value = EEPROM.read(address);
Serial.print("Hodnota na adrese ");
  Serial.print(address);
  Serial.print(": ");
  Serial.println(value);
//digitalWrite(s1, HIGH);*/

}

void loop() 
{
bm0 = (b0 * 0x0202020202ULL & 0x010884422010ULL) % 1023; 
bm1 = (b1 * 0x0202020202ULL & 0x010884422010ULL) % 1023; 
bm2 = (b2 * 0x0202020202ULL & 0x010884422010ULL) % 1023; 
bm3 = (b3 * 0x0202020202ULL & 0x010884422010ULL) % 1023; 
bm4 = (b4 * 0x0202020202ULL & 0x010884422010ULL) % 1023; 
bm5 = (b5 * 0x0202020202ULL & 0x010884422010ULL) % 1023; 

key = bm2 ^ 107;    // vypocet key   (mirror byte2 XOR master_key)

// god know what
out0 = bm0 ^ (key);
Serial.print("GKW = ");
Serial.print(out0);
Serial.println();



// cpmmand
out1 = bm1 ^ (2*key);
Serial.print("command = ");
Serial.print(out1);
Serial.println();

// key
Serial.print("key = ");
Serial.print(key);
Serial.println();

// sekce
out3 = bm3 ^ (4*key);
Serial.print("sekce = ");
Serial.print(out3);
Serial.println();

if (out3 == value) 
{ // tests if x is equal to y
digitalWrite(s1, HIGH);  
}


//checksum
out4 = bm4 ^ (5*key);
Serial.print("checksum = ");
Serial.print(out4);
Serial.println();

//append
out5 = bm5 ^ (6*key);
Serial.print("append = ");
Serial.print(out5);
Serial.println();

Serial.println();
Serial.println();

for (;;) { /* empty */ }      //infinte loop

delay(1000);

}

void hrana() 
{
delay(400);
val = digitalRead(in);
Serial.print(val);

}