0xrsydn/gameboy-rust
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feat(input): implement KEYCNT keypad interrupt control

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Add a dependency-free keypad state machine in gba-core, map KEYCNT, latch IF bit 12, and wake HALT through the existing interrupt gates. Sample complete CPU/DMA control writes once so transient byte values cannot create false requests.

Document the mGBA-style polling policy and its unverified hardware retrigger limits. Cover every button-state/selection pair, register masks, repeated requests, byte/word writes, failed-store isolation, DMA priority, ARM/Thumb IRQ return, BIOS IntrWait, and retained BIOS reset state.

Follow the restructured workspace and modular documentation. Validated on Darwin arm64: workspace and core/demo tests pass in debug and release, with Clippy, rustdoc, ten native window smoke tests, and terminal demos passing.
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0xrsydn 2026-10-05 18:00:46 +07:00
commit 597b02881b
14 changed files with 710 additions and 21 deletions
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docs/testing.md
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@ -148,6 +148,10 @@ Frame tests verify consecutive VBlank events, step limits, error handling, and i
Graphics tests check CPU-generated pixels, movement, edge clamping, opposite directions, colors, and reset behavior.
Video tests cover mirrors, byte-write rules, RGB555 layout, backdrop, forced blank, green swap, and unsupported modes.
Input tests cover all 1,024 button combinations, read-only KEYINPUT behavior, keyboard mapping, and focus loss.
Keypad tests compare every button-state/selection pair with independent per-button OR/AND logic.
They check all KEYCNT values, byte merging, complete-word sampling, empty masks, and repeated request behavior.
Integration tests cover CPU/DMA writes, interrupt masks, HALT wake-up, ARM/Thumb IRQ return, and original BIOS IntrWait.
Failed-store tests check register, IRQ-history, CPU, and clock preservation. BIOS reset tests verify retained KEYCNT state.
The bounded graphics frame runner is checked for instruction errors and timeouts.
Timing tests cover every ROM wait-state setting, access width, ROM window, and 128 KiB boundary handling.
Instruction timing tests cover arithmetic, shifts, branches, transfers, block operations, multiply, and exception returns.