Received two prototype (populated) boards in post. Preliminary test went well, everything appear correct, including the code for the new 6 x 17 matrix layout as opposed to the 10 x10 matrix used in my original Blackpill keyboard.

I failed to notice that QMK supports 25xx-series for SPI (and 24xx-series for IC2) so the current test EEPROM footprint needs changing.

As noted earlier, the new dev board are designed to use a 6 x 17 matrix and the QMK keyboard files require updates to reflect this. After updates to the code, the keyboard generate the correct codes but the layout in usevia.app needs a little work, the Enter key is not in the correct position ++

Update: 21, December

Corrected STM32F411 code, now all key in the correct place, ISO/ANSI switching works, everything else works with usevia including settings RGB... but awaiting expaned board to test RGB.

Added RP2040 version (awaiting boards from PCBWay)... are we there yet?

Added Expander Board (awaiting boards from JLCPCB)... Arerived, perfect...