Adds nRF52840 + SX1262 + 1.14" 240×135 ST7789 color TFT support. First
color display board in the project; introduces a BoardDisplay trait so
each board renders to its native pixel format and resolution without
aliasing or color-quantization round-trips.
Architecture:
- New BoardDisplay trait (src/display.rs) bundles render_*, present(),
set_bright/set_dim. Replaces the old DrawTarget<Color=BinaryColor>
+ DisplayBrightness combo as the LoRaBoard::DisplayDriver bound.
- Mono OLED drivers (Sh1106, Ssd1306Async) get adapter impls that
delegate to the existing display::render module — no behavior change
for any existing board.
- T114 ST7789 driver (src/driver/st7789.rs) wraps lcd-async (async fork
of mipidsi) with a 64,800-byte raw byte framebuffer in .bss. Renders
via lcd_async::raw_framebuf::RawFrameBuf<Rgb565, _>, presents via a
single async DMA blit (panel.show_raw_data(...).await) — the await
yields the executor for the ~65 ms SPI transfer so the radio task
isn't starved during repaints.
- PWM backlight on PWM0 / P0.15 (active-LOW, inverted polarity) for
smooth dim/bright transitions instead of GPIO toggle.
- Native 240×135 Rgb565 renderer (src/display/render_color.rs) with
splash + dashboard + sparkline.
- Shared QR-code blit (src/display/qr.rs), generic over PixelColor,
re-centers the 64×64 bitmap which has cells in cols 0..50 and ~14 px
of right-side padding — both mono and color splash now show the QR
with 7 px quiet zones on all four sides (was visibly left-shifted).
- Shared content types (BoardInfo, DashboardCtx) decouple what to draw
from how each board renders it.
- create_display() now takes the board's full DisplayParts bundle
(was just the I2C bus) so non-I2C displays can carry SPI + control
pins through.
Hardware:
- VEXT_ENABLE on P0.21 driven HIGH at boot — powers the SX1262 + TFT
rail. Without this, lora-phy init succeeds at the SPI level but
TX_DONE never fires.
- VTFT_CTRL on P0.03, active LOW; backlight on P0.15, active LOW.
- TFT SPI2 (SCK P1.08 / MOSI P1.09) at 8 MHz over EasyDMA. Async
ExclusiveDevice from embedded-hal-bus (with the 'async' feature).
- lcd-async builder at display_size(135, 240), display_offset(52, 40),
Deg90 rotation, ColorInversion::Inverted — standard 1.14" ST7789
die mapping.
- Linker: shared ld/nrf52840-memory.x (S140 SoftDevice preserved at
0x01000-0x26000 per project policy).
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.
swaits