deskthority

I'm using QMK to make my layout for a typewriter conversion. The problem is, since I'm building the firmware as if it were for a Pro Micro, and then converting it to a Proton C layout (using CTPC=yes), I'm still limited to the available 18 pins on the Pro Micro and can't use the full 23 available pins of the Proton C. Can someone help me out here? I don't know how to write it natively for the Proton C, so I don't know how to use the extra pins. I've read through the QMK docs and it doesn't seem to answer my question. i'd really appreciate any help.

Maybe the extra pins are not supported that way?

I would start with the code in "qmk_firmware/keyboards/proton_c".
In "config.h", define MATRIX_ROWS and MATRIX_COLS to the dimensions of the key matrix.
Define MATRIX_ROW_PINS and MATRIX_COL_PINS as arrays of the pins to use.

Other than those two things, is it the same process as writing the code for an AVR based firmware? I've heard that they have to be written differently.