WebUSB Support#114
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- Make CanAdapter::send/recv async so async-only transports (WebUSB) and blocking ones (rusb/SocketCAN) share one trait. AsyncCanAdapter drives adapters on a dedicated thread (block_on) natively and via spawn_local on wasm. - Add a generic UsbBackend trait with RusbBackend (native) and WebUsbBackend (wasm) impls; port the panda onto it (Panda<B>). - Decouple USB transport from adapter: rusb-backend / webusb backend features, independent of adapters. panda implies rusb-backend so --features panda is unchanged; panda-over-WebUSB is --features panda,webusb. rusb is a not(wasm) target dependency. isotp/uds gated out of the wasm build. Adds a Trunk demo. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Port the PEAK PCAN-USB FD adapter onto the UsbBackend trait (Peak<B>) so it works over WebUSB in the browser as well as rusb natively. Generalizes the trait: control transfers take a request type + recipient (PEAK uses Vendor/Other), write_bulk returns the written byte count (short-write requeue), and read_bulk reports a timeout as an empty read so adapters stay backend-agnostic. RusbBackend auto-detaches the kernel driver on open. The web demo gains a second button to connect to a PEAK adapter, and scripts/release_peak_usb.sh unbinds the in-kernel peak_usb driver (WebUSB cannot detach kernel drivers) so a browser can claim the device on Linux. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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