Interacting with a Gameboy Printer

Projects Discussion and Showcase Device Hacking
1

Hello Arduino communuty,
for long I've had two old Gameboy Printers laying around in my House and wanted to use them to Print by PC and maybe also even via a standalone Arduino (Like printing weather data, etc. possiblilites are existing :smiley: )
Now (not actually, I've seen this long before, but never had any microcontrollers back then) I've stumbled accross furrtek.fr again (they were featured on hackaday) and I've downloaded the code written in C

/*
GBLink/PC interface v1.1
CC BY furrtek 2010
http://www.furrtek.org
Attiny45 @ 8Mhz
*/

#define F_CPU 8000000UL

#include <avr/io.h>
#include <util/delay.h>
#include <inttypes.h>

// Pin defs relative to gb (master) serial port:
#define		SCK	0
#define		SOUT	1
#define		SIN	2

/*
    __ __
  +|     |+
RX | t45 |SIN
TX |     |SOUT
GND|_____|SCK

*/

#define		RX	_BV(PB3)
#define		TX	_BV(PB4)

// Super UART software à 57600bps
void SerialPut(uint8_t byte) {
	PORTB &= ~TX;		// Start
	_delay_us(13);
	for (uint8_t bit=0x00;bit<8;bit++) {
		if ((byte >> bit) & 1)
			PORTB |= TX;
		else
			PORTB &= ~TX;
		_delay_us(14);
	}
	PORTB |= TX;		// Stop
}

uint8_t SerialGet(void) {
	uint8_t rreply=0;
	while(bit_is_set(PINB,3)) {}
	_delay_us(18);
	for (uint8_t bit=0x00;bit<8;bit++) {
		rreply = rreply>>1;
		if (bit_is_set(PINB,3)) rreply |= 0x80;
		_delay_us(18);
	}
	return rreply;
}

uint8_t GBSerialOut(uint8_t command) {
	uint8_t clock,reply=0;
	for (clock=0;clock<8;clock++) {
		reply = reply << 1;			// Shifte la réponse
		PORTB &= ~_BV(SCK);
		if ((command << clock) & 0x80) {
			PORTB |= _BV(SOUT);
		} else {
			PORTB &= ~_BV(SOUT);
		}
		_delay_us(20);				// Overclocked, 60
		PORTB |= _BV(SCK);
		if (bit_is_set(PINB,SIN)) reply |= 1;
		_delay_us(20);				// Overclocked, 60
	}
	_delay_us(20);
	return reply;
}

int main(void) {
	uint8_t c,b,cmd,repl,buffer[64];
	uint16_t CRC;

	WDTCR = (1<<WDCE) | (1<<WDE);	// Kick doggie
	WDTCR = 0x00;

	DDRB = 0b00010011;				// TX, SCK et SOUT en outputs
	PORTB = 0b00010000;				// Pull-Up sur TX

	while(1) {
		cmd = SerialGet();

		if (cmd == '?') {
			GBSerialOut(0x88);
			GBSerialOut(0x33);
			GBSerialOut(0x01);
			GBSerialOut(0x00);
			GBSerialOut(0x00);
			GBSerialOut(0x00);
			GBSerialOut(0x01);
			GBSerialOut(0x00);
			repl = GBSerialOut(0);
			GBSerialOut(0);
			if (repl == 129) {
				SerialPut('1');
			} else {
				SerialPut('0');
			}
		}

		if (cmd == '!') {
			GBSerialOut(0x88);
			GBSerialOut(0x33);
			GBSerialOut(0x01);
			GBSerialOut(0x00);
			GBSerialOut(0x00);
			GBSerialOut(0x00);
			GBSerialOut(0x01);
			GBSerialOut(0x00);
			repl = GBSerialOut(0);
			//SerialPut(repl);
			repl = GBSerialOut(0);
			//SerialPut(repl);

			GBSerialOut(0x88);
			GBSerialOut(0x33);
			GBSerialOut(0x04);
			GBSerialOut(0x00);
			GBSerialOut(0x80);
			GBSerialOut(0x02);
			CRC = 0x86;

			for (b=0;b<10;b++) {
				SerialPut('a');

				for (c=0;c<64;c++) {
					buffer[c] = SerialGet();
				}

				for (c=0;c<64;c++) {
					cmd = buffer[c];
					GBSerialOut(cmd);
					CRC += cmd;
				}
			}

			GBSerialOut((uint8_t)CRC & 0xFF);			// CRC Low
			GBSerialOut((CRC & 0xFF00)>>8);				// CRC High
			repl = GBSerialOut(0);
			//SerialPut(repl);
			repl = GBSerialOut(0);
			//SerialPut(repl);



			_delay_ms(10); 		// 131: répond 4 au lieu de 8, 265 timeout (0)

			GBSerialOut(0x88);	// Data vide
			GBSerialOut(0x33);
			GBSerialOut(0x04);
			GBSerialOut(0x00);
			GBSerialOut(0x00);
			GBSerialOut(0x00);
			GBSerialOut(0x04);
			GBSerialOut(0x00);
			repl = GBSerialOut(0);
			//SerialPut(repl);
			repl = GBSerialOut(0);
			//SerialPut(repl);

			GBSerialOut(0x88);	// Print
			GBSerialOut(0x33);
			GBSerialOut(0x02);
			GBSerialOut(0x00);
			GBSerialOut(0x04);
			GBSerialOut(0x00);

			CRC = 6;
			SerialPut('1');
			for (c=0;c<4;c++) {
				buffer[c] = SerialGet();
			}

			for (c=0;c<4;c++) {
				cmd = buffer[c];
				GBSerialOut(cmd);
				CRC += cmd;
			}

			GBSerialOut((uint8_t)CRC & 0xFF);			// CRC Low
			GBSerialOut((CRC & 0xFF00)>>8);				// CRC High

			repl = GBSerialOut(0);
			//SerialPut(repl);
			repl = GBSerialOut(0);
			//SerialPut(repl);

			while(1) {
				GBSerialOut(0x88);	// Status
				GBSerialOut(0x33);
				GBSerialOut(0x0F);
				GBSerialOut(0x00);
				GBSerialOut(0x00);
				GBSerialOut(0x00);
				GBSerialOut(0x0F);
				GBSerialOut(0x00);
				GBSerialOut(0);
				if (GBSerialOut(0) & 2) break;
				_delay_ms(100);
			}
			SerialPut('P');

			while(1) {
				GBSerialOut(0x88);	// Status
				GBSerialOut(0x33);
				GBSerialOut(0x0F);
				GBSerialOut(0x00);
				GBSerialOut(0x00);
				GBSerialOut(0x00);
				GBSerialOut(0x0F);
				GBSerialOut(0x00);
				GBSerialOut(0);
				if (!(GBSerialOut(0) & 2)) break;
				_delay_ms(100);
			}
			SerialPut('O');

		}

	}

    return 0;
}

but my skills are not that high, that I would know how to port that for an arduino and I now wanted to ask if anyone of you could do this and maybe also explain how you did this :slight_smile:

greetings from germany :stuck_out_tongue:

EDIT:

I have now, after going deeper in search found a port of furrteks Code by milesburton, here it is :
http://www.milesburton.com/Gameboy_Printer_with_Arduino

thread can be closed i think