swaits
42a6b1142d
Splash holds bright for 10 s on (re-)entry, then drops to dim while LearnMore/Info keep alternating. The dashboard stays bright for 3 s after the last packet or mode change, then dims in place without disturbing the Listening/Transmitting state or the 1 s sparkline timer. Cross-leaf TX↔RX hops stay bright throughout — `set_dim` is fired by the 3 s timer handler as an action rather than as a sibling `exit:` action, so mode-change leaf-crossings no longer flash dim→bright on every swap. Two driver families (`ssd1306::Ssd1306Async` and the in-tree `Sh1106`) wrapped behind a single `DisplayBrightness` trait in `src/driver/mod.rs`; the board trait's `DisplayDriver` associated type now requires it. Dim/bright contrast values centralized as `CONTRAST_BRIGHT` / `CONTRAST_DIM` constants — tune in one place. `On.on(CmdReset)` now targets `LearnMore` directly rather than the ancestor `Splash`. Under hsmc 0.2 up-transition semantics, targeting an already-active ancestor unwinds only below it without re-descent; the USB-disconnect reset path was previously relying on the old re-enter-and-descend behavior and would have parked at `Splash` with a dead alternation timer. Bumps `hsmc` 0.1.0 → 0.2 for the up-transition semantic fix.
DongLoRa Firmware
Embedded Rust firmware for DongLoRa boards. Exposes the LoRa radio over USB CDC-ACM using a COBS-framed binary protocol.
Building
just setup # one-time toolchain install
just build heltec_v4 # build for a specific board
just flash heltec_v4 # build + flash
just check-all # compile-check all boards
just clippy heltec_v4 # lint
just test # host-side protocol unit tests
All commands are run from the firmware/ directory.
Supported Boards
| Board | Feature | MCU | Radio | USB | Target |
|---|---|---|---|---|---|
| Heltec V3 | heltec_v3 |
ESP32-S3 | SX1262 | Native CDC-ACM | xtensa-esp32s3-none-elf |
| Heltec V3 (UART) | heltec_v3_uart |
ESP32-S3 | SX1262 | CP2102 bridge | xtensa-esp32s3-none-elf |
| Heltec V4 | heltec_v4 |
ESP32-S3 | SX1262 | Native CDC-ACM | xtensa-esp32s3-none-elf |
| ELECROW ThinkNode-M2 | elecrow_thinknode_m2 |
ESP32-S3 | SX1262 | CP2102 bridge | xtensa-esp32s3-none-elf |
| RAK WisBlock 4631 | rak_wisblock_4631 |
nRF52840 | SX1262 | Native CDC-ACM | thumbv7em-none-eabihf |
| Waveshare RP2040-LoRa | waveshare_rp2040_lora |
RP2040 | SX1262 | Native CDC-ACM | thumbv6m-none-eabi |
| Wio Tracker L1 | wio_tracker_l1 |
nRF52840 | SX1262 | Native CDC-ACM | thumbv7em-none-eabihf |
Heltec V3 USB Note
The default heltec_v3 build uses native USB CDC-ACM, which requires a
hardware modification to your board. Stock Heltec V3 boards route USB through a
CP2102 bridge chip to UART — the ESP32-S3's native USB pins (GPIO19/GPIO20) are
routed to header pins but not connected to the USB connector.
To enable native USB on a Heltec V3:
- Solder 0-ohm (or 22-ohm) resistors at pads R29 (D+) and R3 (D-)
- Disconnect the CP2102 from the USB connector's D+/D- lines (cut traces or remove the CP2102 bridge resistors)
After this mod, the board appears as /dev/ttyACM0 with the DongLoRa VID:PID
(1209:5741), just like the V4 and nRF boards.
If you have a stock (unmodified) V3, use heltec_v3_uart instead:
just build heltec_v3_uart
just flash heltec_v3_uart
This builds firmware that communicates via the CP2102 bridge (appears as
/dev/ttyUSB0).
Adding a Board
See src/board/PORTING.md.
Protocol
See PROTOCOL.md for the complete wire format specification.