Reverse Engineering the Out-of-stock GreenPAK Serial Debugger (and make the DIY one!).

I've been away for a while (that's 3 months!). Been busy with ABU Robocon 2023 competition lately. Back in late March. I bought yet another "programmable logic device" from Element 14. This time is not the Lattice FPGA, but rather the less popular FPGA Programmable Mixed-Signal Matrix called GreenPAK. GreenPAK was a product of now …