USB2BTLE

Convert boot-protocol from USB to Bluetooth LE.

Board support.

The code is divided into a USB controller (in the samd directory) and a Bluetooth LE controller (in nrf52).

The USB controller acts as an I²C master sending to the BTLE controller.

USB Controller (samd)

• Adafruit Trinket M0
• Adafruit Feather M4

BTLE Controller (nrf52)

• Adafruit Feather 52832
• Adafruit Feather 52840

Wiring

Compiling/Flashing

This is only tested on Linux. You will need to make changes for other platforms.

Edit the Makefile in nrf52 and samd to select the appropriate include for your board. You may also need to edit Makefile.common in the root to specify paths to gcc-arm and various Arduino bits.

You should follow the arduino setup instructions for your boards. While we’re not using the Arduino IDE, we do rely on board support packages being installed.

You will also need the SimplyAtomic library, available here.

Some keyboards require the USB_Host_Library_SAMD to probe properly. Try installing it if you’re having issues.

Once everything’s set up, you’ll need to build and flash the images to your board. The instructions are the same for both:

Bluetooth controller:

1. cd nrf52
2. make all flash

USB controller:

1. cd samd
2. make all flash

TODO

• samd/nrf directory names should be changed.

• Makefile dependencies fixed so make all doesn’t require a clean when a non-ino file is changed.

• find-serial-port is Linux-only.

• bossac tool path isn’t conditionalized sanely.

• Consumer key support.

• Report protocol support.