The nRF24 is a packet based system so there is no way for us to send and receive data at the same time. On a closer look, it looks like data is exchanged on each clock cycle for serial in and out which isn’t good news for us. Once both players are racing together, we can see some data being exchanged. F1 Race now waits on the screen like we are waiting for other players.
When the other side is plugged in, we can see the SIN goes low. The F1 Race game shows that you are the only player in the game and you can continue on to the race. We can see the clock is slow (120us per cycle) and that the serial in is high, serial out is low so it doesn’t seem to be sending anything.
Out comes the logic analyser to take a look at the signals, the game I was trying the multiplayer on was F1 Race and with just 1 end of the cable connected. We have 5V, serial out, serial in, clock out and ground, seems easy enough. Let’s take a look at the link cable pinout. The GBA connector won’t fit in the Gameboy but the Gameboy connector will fit into the GBA. I ordered both but only the Gameboy link cable had all the pins on the connector where as the GBA only had the ones it needed. There are different link cables – one for the Gameboy and another for the GBA. Since making the the Wireless Gameboy Controller, there were some ideas thrown around about making other devices of it wireless, one of them was the Gameboy Link Cable which we’re going to look at today.
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