pokemon_gbc_cable_link_arduino.pde

// Link Cable     Arduino      Desc
// 6              GND          GND
// 5              2            SC
// 2              3            SI
// 3              4            SO
#define delayMs 20

unsigned char DATA_BLOCK[415] = {0x87,0x80,0x82,0x8A,0x84,0x91,0x50,0x00,0x00,0x00,0x00,0x1,0x4A,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0x4A,0x1,0x2c,0x4a,0x00,0x14,0x08,0x1F,0x7E,0x38,0x09,0x19,0x4,0xd2,0x3,0xd,0x40,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xc0,0xc0,0xc0,0xc0,0x4a,0x1,0x2c,0x0,0x96,0x0,0x97,0x0,0x98,0x0,0x99,0x4A,0x1,0x2c,0x4a,0x00,0x14,0x08,0x1F,0x7E,0x38,0x09,0x19,0x4,0xd2,0x3,0xd,0x40,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xc0,0xc0,0xc0,0xc0,0x4a,0x1,0x2c,0x0,0x96,0x0,0x97,0x0,0x98,0x0,0x99,0x4A,0x1,0x2c,0x4a,0x00,0x14,0x08,0x1F,0x7E,0x38,0x09,0x19,0x4,0xd2,0x3,0xd,0x40,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xc0,0xc0,0xc0,0xc0,0x4a,0x1,0x2c,0x0,0x96,0x0,0x97,0x0,0x98,0x0,0x99,0x4A,0x1,0x2c,0x4a,0x00,0x14,0x08,0x1F,0x7E,0x38,0x09,0x19,0x4,0xd2,0x3,0xd,0x40,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xc0,0xc0,0xc0,0xc0,0x4a,0x1,0x2c,0x0,0x96,0x0,0x97,0x0,0x98,0x0,0x99,0x4A,0x1,0x2c,0x4a,0x00,0x14,0x08,0x1F,0x7E,0x38,0x09,0x19,0x4,0xd2,0x3,0xd,0x40,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xc0,0xc0,0xc0,0xc0,0x4a,0x1,0x2c,0x0,0x96,0x0,0x97,0x0,0x98,0x0,0x99,0x4A,0x1,0x2c,0x4a,0x00,0x14,0x08,0x1F,0x7E,0x38,0x09,0x19,0x4,0xd2,0x3,0xd,0x40,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xc0,0xc0,0xc0,0xc0,0x4a,0x1,0x2c,0x0,0x96,0x0,0x97,0x0,0x98,0x0,0x99,0x81,0x8E,0x81,0x81,0x8E,0x50,0x00,0x00,0x00,0x00,0x00,0x81,0x8E,0x81,0x81,0x8E,0x50,0x00,0x00,0x00,0x00,0x00,0x81,0x8E,0x81,0x81,0x8E,0x50,0x00,0x00,0x00,0x00,0x00,0x81,0x8E,0x81,0x81,0x8E,0x50,0x00,0x00,0x00,0x00,0x00,0x81,0x8E,0x81,0x81,0x8E,0x50,0x00,0x00,0x00,0x00,0x00,0x81,0x8E,0x81,0x81,0x8E,0x50,0x00,0x00,0x00,0x00,0x00,0x80,0xAB,0xA2,0xA7,0xA4,0xAC,0xB8,0x50,0x50,0x50,0x50,0x80,0xAB,0xA2,0xA7,0xA4,0xAC,0xB8,0x50,0x50,0x50,0x50,0x80,0xAB,0xA2,0xA7,0xA4,0xAC,0xB8,0x50,0x50,0x50,0x50,0x80,0xAB,0xA2,0xA7,0xA4,0xAC,0xB8,0x50,0x50,0x50,0x50,0x80,0xAB,0xA2,0xA7,0xA4,0xAC,0xB8,0x50,0x50,0x50,0x50,0x80,0xAB,0xA2,0xA7,0xA4,0xAC,0xB8,0x50,0x50,0x50,0x50};


int volatile CLOCK_PIN = 2;
int volatile SO_PIN = 4;
int volatile SI_PIN = 3;
int volatile data = 0;
int volatile counter = 0;
int volatile val = 0;

unsigned volatile long lastReceive = 0;


volatile byte outputBuffer = 0x01;


void setup() {
  pinMode(SI_PIN, INPUT);
  digitalWrite( SI_PIN, HIGH);  
  pinMode(SO_PIN, OUTPUT);
  pinMode(CLOCK_PIN, OUTPUT);
  Serial.begin(9600);
  attachInterrupt( 0, clock, RISING );
}

void clock()
{
  unsigned long t = 0;
  byte in;
  if ( lastReceive > 0 )
  {
    if ( micros() - lastReceive > 120 )  // too long, must be a new sequence (takes about 120 microsecs for a bit)
    {
      counter = 0;
      val = 0;
      in = 0x00;
    }
  }
       
  data = digitalRead(SI_PIN);
  
  if ( data == HIGH ){
    val |= ( 1 << (7-counter) );
    in |= ( 1 << (7-counter) );
  }
  if ( counter == 7 )
  {
    Serial.print("<< ");
    Serial.println( val, DEC );
    Serial.println( val, HEX );
    val = 0;
    in = 0x00;
    counter = -1;
  }
    
  counter++;
  lastReceive = micros();
}


// 8 clock intervals (8bits per packet)
void GBSerialOut(uint8_t command) {
  //uint8_t gbReplyy=0;
  for (uint8_t clock=0;  clock<8;  ++clock) {
    digitalWrite(CLOCK_PIN, 0);           // Send clock signal
    if((command << clock) & 0x80){
      digitalWrite(SO_PIN, 1); // Write out to printer
    }
    else{ 
      digitalWrite(SO_PIN, 0);
    }
    delayMicroseconds(delayMs);		// Wait 20-60us
    digitalWrite(CLOCK_PIN, 1);            // End clock
  }
  delayMicroseconds(delayMs);		// Wait 20-60us
}

uint8_t cmd;
boolean discover = true;
void loop() { 
 cmd = Serial.read();
 if (cmd == 's') {
   GBSerialOut(0x01);
   delay(8000);
   GBSerialOut(0x60);
   delay(1000);
   GBSerialOut(0x7F);
   delay(1000);
   GBSerialOut(0xD4);
   delay(1000);
   GBSerialOut(0xD0);
   // INIT SENT DATA
 }
}