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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3
crates/gba-core/src/input.rs
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@ -1,6 +1,9 @@
//! Platform-independent GBA button state. Bits are pressed-high here;
//! the KEYINPUT register exposes their active-low hardware representation.
mod keypad;
pub(crate) use keypad::Keypad;
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
#[repr(u16)]
pub enum Button {