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.
This commit is contained in:
0xrsydn 2026-10-05 18:00:46 +07:00
commit 597b02881b
14 changed files with 710 additions and 21 deletions
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5
crates/gba-core/tests/graphics.rs
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@ -279,10 +279,7 @@ fn keyinput_exposes_all_ten_buttons_active_low_and_ignores_writes() {
memory.set_buttons(Buttons::default());
assert_eq!(memory.read16(KEYINPUT).unwrap(), 0x3ff);
assert_eq!(memory.cycles(), 0);
assert_eq!(
memory.read16(KEYINPUT + 2),
Err(MemoryError::Unmapped(KEYINPUT + 2))
); // KEYCNT deferred.
assert_eq!(memory.read16(KEYINPUT + 2).unwrap(), 0); // KEYCNT resets disabled.
}
#[test]