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#### 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.
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