Add hw---gdk support for the Game Designer's Kit#7600
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Introduce hw---gdk for the Game Designer's Kit: direct GPIO arcade buttons, ST7735 SPI display, active-low backlight fix, and single-shot SAADC for the on-board battery divider and low-battery LED.
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The in-editor hardware chooser already lists Game Designer's Kit from libs/hw---gdk/pxt.json; targetconfig hardwareOptions added a second card with the same name.
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Summary
Adds
hw---gdkfor the Game Designer's Kit: a micro:bit V2 shield with a direct ST7735 SPI display and GPIO arcade buttons (compileServiceVariant:nrf52833).Product: Hadron RoboLabs (brand), Deltabotix (registered company). Pilot / pre-production hardware; product documentation is in the linked repository (PCB design files are not published).
Why not
hw---n3?hw---n3targets shift-register buttons and smart-display type 4242. This board uses:A separate variant is required so pin maps and drivers match the physical board.
Board-specific behavior
init.tsdrives P10 active-LOW and re-applies via a 1 Hz watchdog (CODAL ST7735 init does not match this FET wiring)gdk.readP0Adc()single-shot read inanalog.cppbatteryled.ts(does not alter PPI/timers)Files changed
libs/hw---gdk/—config.ts,init.ts,batteryled.ts,analog.cpp, shims,pxt.jsoncardpxtarget.json(bundleddirs+staticpkgdirs.base)docs/hardware.md,docs/arcade-devices.md,docs/static/hardware/game-designers-kit.jpgtargetconfig.jsonhardwareOptionsentry (that duplicated the hardware picker card; removed in commit68df5f19)Test plan
pxt buildinlibs/hw---gdksucceeds (cloud C++ compile) — verified on prior branch iterationhw---n3shields (separate variant)pxt cion this runner — not run here (pxtCLI not installed in local environment; upstream workflowpxt-buildpushrequires maintainer approval for fork PRs)Review notes