rp2040-macropad

Turn your dummy usb numeric keypad into a fully hackable macropad.

What you need:

1. A Waveshare RP2040-Zero clone.
2. An usb socket/cable
3. An usb numeric keyboard

Why?

Because I needed to run some macros and I already have a dummy nice usb keypad. For 5$ and some soldering I now have a macropad :)

How?

The Pico is configured as a dual role usb host/device. It receives hid reports from the host port (gp0[d+] & gp1[d-]) and emits hid reports based on the current layer.

There's a numeric mode that reports key events as they arrived, with the exception of Bloq num, which is used to switch between layers.

Notes

1. This is sample code. I'm sharing it here because I didn't find related projects online.
2. This project has a few layers as an example. Please look at them and adapt them to your needs. But please do not submit PRs or open tickets for specific layers.
3. I'm mostly done with this project :). It does exactly what I need and I already run it in production. Do not expect many changes. Patches are welcome as long as they fit the scope of the project: sample code to turn a dummy keypad into a macropad.

Compile time options:

In CMakeLists.txt:

USE_RGB_LED: drives a rgb led on gpio16.

USE_CDC_DEVICE: enables a composite CDC/HID device instead of a single HID device. Allows to reboot the rp-2040 board to program mode by typing dfu on the serial interface (i.e: echo "dfu" > /dev/ttyACM0 on Linux)

USE_EXTRA_KEYS_EPOMAKER_TH21: Bloq Num toggles between numeric mode and last macro layer. Tab and Backspace are used while in macro mode to switch to previous/next layer.

Credits

• @hathach for TinyUSB project
• @sekigon-gonnoc for Pico-PIO-USB
• The Pi foundation for such an awesome microcontroller and related documentation :)