[Steve] wanted to do some ARM development and set his sights on the Game Boy Advance as a development package. In order to get his code onto the device he build an Arduino-based communications cable. It is necessary to have a microcontroller involved because the GBA uses a peculiar 16-bit serial communications protocol. This cable is an adaptation from the 8051-based cable developed by [Matt Evans] several years ago. [Steve's] got it working by porting the 8051 assembler over for the Arduino, but we’d recommend adding a level converter to his hardware setup to step down from the Arduino’s 5v logic to the 3.3v logic the GBA expects.
He didn’t make up a wiring diagram, but in the code comments [Steve's] laid out the connections as follows:
Arduino 8 to GBA SO
Arduino 9 to GBA SI
Arduino 10 to GBA SD
Arduino 11 to GBA SCThat’s it, follow the README in his source code package and you’re on your way to some ARM development.