Keyball61 on rp2040

[idank]

Hi,

I previously had success with Keyball44 conversion to rp2040, and now I tried to convert Keyball61 and run into some issues. I tried to disable all features and just test the keyboard matrix and got stuck there where no key presses are registered. I noticed Keyball61 uses custom matrix scanning code called "duplexmatrix" and this is my first suspect where the compatibility issue might be. @koron I see you write this code, any idea why this wouldn't work on rp2040? To rule out soldering issue, I tested the keyboard with pro micro and it is working.

Here are the changes I made to the firmware to compile it for rp2040: idank/qmk_firmware@ef9a3dc

The same repo has working rp2040 Keyball44 firmware.

[idank]

I managed to solve it by modernizing the matrix scanning code, see idank/qmk_firmware@c78580f.

[carlos-gtz]

@idank , what are the changes needed for the keyball44 to work with rp2040?

[idank]

You can find a working firmware on my clone https://github.com/idank/qmk_firmware/tree/dev-rp2040/keyboards/keyball