The various tools for developing the firmware were installed on the mac, and a very simple basic program was coded to achieve the simplest test of being able to upload source code onto the device.
The prototype was successfully programmed to simply flash through the colors of the left hand side LED.
The flashing LED shows that the development tool, the compiler, and the programming dongle are working.
An error was found and fixed with two fine copper ‘bodge’ wires. The analog voltage supply and ground was left off. A future revision of the PCB would include these connections and remove the need for the manual addition of the two small fince copper bodge wires.