passkey_fw/examples/device/cdc_uac2

Composite CDC + UAC2 on Pico

This example provides a composite CDC + UAC2 device on top of a Raspberry Pi Pico board.

Use Cases

• The CDC + UAC2 composite device happens to be important, especially in the amateur radio community.

  Modern radios (rigs) like Icom IC-7300 + IC-705 expose a sound card and a serial device (composite device) to the computer over a single USB cable. This allows for Audio I/O and CAT control over a single USB cable which is very convenient.

  By including and maintaining this example in TinyUSB repository, we enable the amateur radio community to build (homebrew) radios with similar functionality as the (expensive) commercial rigs.

  This PR is important in bridging this specific gap between the commercial rigs and homebrew equipment.

• https://digirig.net/digirig-mobile-rev-1-9/ is a digital interface for interfacing radios (that lack an inbuilt digital interface) with computers. Digirig Mobile works brilliantly (is OSS!) and is a big improvement over traditional digital interfaces (like the SignaLink USB Interface). By using a Raspberry Pi Pico powered CDC + UAC2 composite device, we can simplify the Digirig Mobile schematic, drastically reduce the manufacturing cost, and (again) enable the homebrewers community to homebrew a modern digital interface with ease themselves.

Build Steps

cd examples/device/cdc_uac2

export PICO_SDK_PATH=$HOME/pico-sdk

cmake -DFAMILY=rp2040 pico .

cmake -DFAMILY=rp2040 -DCMAKE_BUILD_TYPE=Debug # use this for debugging

make BOARD=raspberry_pi_pico all

Development Notes

Please try to keep this code synchronized with the uac2_headset example included in this repository.