First RP2040 board and third MCU family (after ESP32-S3 and nRF52840).
Hardware: RP2040 + SX1262 radio, 850-930 MHz HF, PE4259 antenna switch,
LED on GPIO25, no OLED, USB-C via FPC ribbon cable to adapter board.
New files:
- src/hal/rp2040.rs: MCU primitives (SPI bus, USB driver, flash unique ID MAC)
- src/board/waveshare_rp2040_lora.rs: board implementation
- ld/rp2040-memory.x: linker memory layout
Also fixes cortex-m-rt/set-vtor (moved from global dep to per-board feature,
since Cortex-M0+ has no VTOR register) and makes build.rs memory.x selection
target-aware.
- Set disconnected flag on DisplayCommand::Reset to block stale radio
status updates from re-rendering dashboard over splash screen
- Send StopRx to radio when USB DTR drops so radio stops generating
packets after host disconnects
- Use try_send for unsolicited responses (RxPacket, error recovery,
StopRx Ok) to prevent radio task deadlock on full response channel
- Fall back to LED-only event loop when display init fails instead of
returning early and orphaning the LED
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
swaits
