- Refactor PHY to be higher-level with a field focus (controller/peripheral address,
control byte, etc)
- Phy layer is now device address aware (ACK's automatically) (Hardens
previously ~implicit design to only support emulating one AVCLAN
unit per mockingboard build)
- Redesign `phy_active` => `phy_frame_pending` (to allow
asynchronous/buffered frame reads on pico) and embed within
Peripheral::read
- Add `deafen` function: like mute, but also ignore incoming messages (i.e.
don't receive/process at all). Makes `Bus::is_active` always return
`false`.
- Add debug bus driving functions
Assisted-by: Claude Code (Opus 5)
Allen Hill