@geastack/targets

Native embedded build targets for GeaStack. The package ships the ESP32 and RP2350 board sources, board catalog, BLE/WiFi OTA clients, and build/flash adapter used by the gea CLI.

Applications normally install @geastack/cli, which brings this package and the required compiler, runtime, host, engine, elements, and chip packages with it:

npm install @geastack/cli
npx gea setup
npx gea build --board amoled
npx gea flash --board amoled --monitor

The CLI resolves every native package from npm. Generated C++, CMake state, sdkconfig, and firmware images are written to the application’s .gea/build/<target>/ directory.

Every board workflow is a gea command; this package contains no scripts of its own. targets.json at the package root is the target catalog the CLI reads (npx gea targets list), and each targets/<id>/ directory is the matching ESP-IDF or Pico SDK project.

Board aliases (which physical unit answers to --board amoled, its USB serial, its IP) are machine-local configuration and are not part of this package: the CLI reads ~/.geastack/boards.json for every board on the machine and the application's .gea/boards.json for project overrides. npx gea boards add registers a board, npx gea boards discover identifies the ones plugged in, and npx gea boards list shows what resolves.

App-local custom targets

An application can compose a custom target from a supported native base. The board alias points to a target definition relative to .gea/boards.json:

{
  "my-board": {
    "target": "my-board",
    "targetDefinition": "targets/my-board.json",
    "appPlatform": "esp32"
  }
}

The definition names its extends base, reusable chip drivers, buses, and GPIO pins. gea chips list, gea chips info, gea chips add, and gea chips remove edit those selections from the installed @geastack/chips/catalog.json. During CMake configuration this package checks the definition against that same catalog, generates board.h, rejects GPIO collisions, and includes only the selected portable sources and ESP-IDF bindings. The first composable platform base is esp32-s3; its complete display and touch stack is CO5300, FT3168, AXP2101, QMI8658, and ES8311. Controllers without an ESP32-S3 binding fail before compilation.

Every chip role is optional, so a bare module composes too. Omit chips.display and the board is headless: display_headless.cpp gives it the same canvas-backed Display every target has, rasterizing into PSRAM and flushing to memory rather than a panel. The native test host runs the framework the same way. Omit chips.touch and it takes the no-op Touchscreen. A definition also carries its own flashSize and partitions, because those are the module's geometry and not the base's.

See the tutorials repository's embedded-tutorials/02-custom-board-composition course for a complete target definition and firmware build.

ES8311 audio duplex mode

The ESP32 ES8311 binding defaults to half duplex. Applications can opt into simultaneous capture and playback with "GEA_AUDIO_FULL_DUPLEX=1" in their gea.defines array. Removing the define restores the default; it is not a board-wide setting. On the AMOLED 2.06, capture uses its separate ES7210 ADC.

In full duplex, opening either direction preserves the other. RX uses 20 ms blocks and does not hold the TX write lock while waiting for samples. Both directions must use the same sample rate because they share I2S clocks; a conflicting open fails without closing the existing stream. Capture is 16 kHz, so simultaneous playback must also be 16 kHz. Closing playback leaves capture running, and audio resources are released once neither direction uses them.

The driver exposes raw microphone audio; this option does not add acoustic echo cancellation. Applications using a loudspeaker must provide their own echo processing if required. Default half-duplex capture keeps its existing 2048-sample blocks and playback arbitration.

node targets/esp32/test/audio-full-duplex.test.mjs compiles the production open/capture methods in both modes, checks clock conflicts, and verifies that a blocked RX read permits TX progress only in the opted-in mode. Its executable uses the board's existing ignored build/ directory.

With GEA_AUDIO_ECHO_CANCELLATION=1, applications can scale the board's calibrated post-AEC gain with GEA_AUDIO_AEC_OUTPUT_GAIN_SCALE. Its default is 1.0f; 0.501187234f reduces gain by 6 dB. Scaling happens before int16 clipping, without changing ADC gain or the echo reference. Valid scales are 0 through 64. node targets/esp32/test/audio-aec-output-gain.test.mjs verifies both AMOLED calibrations and rejects invalid scales without creating build artifacts.

License

This repo is the GeaStack embedded board support (ESP32, RP2350) and is licensed GPL-3.0-only (see LICENSE). The GeaStack framework, compiler and desktop/mobile targets are Apache-2.0; the embedded targets are where the GPL applies. In practice:

• Open-source firmware: free.
• Evaluation, prototypes, internal devices: free. The GPL's conditions apply when you distribute, not when you use.
• Closed-source firmware shipped through this target: needs a commercial license. Contact contact@geastack.com for commercial terms.