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/architecture.md
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@ -61,6 +61,7 @@ The repository is a Cargo workspace with three crates:
| `crates/gba-core/src/video/sprites/pipeline.rs` | Two prepared row buffers, cycle40 events, and bounded capture-disabled advancement |
| `crates/gba-core/src/video/sprites/budget.rs` | Nominal per-row work allowance, partial canvas prefixes, and independent arithmetic tests |
| `crates/gba-core/src/input.rs` | Platform-independent GBA button state |
| `crates/gba-core/src/input/keypad.rs` | KEYCNT mask, OR/AND matching, and keypad IRQ sampling history |
| `crates/gba-demos/src/graphics_demo.rs` | Original ARM bitmap program and shared bounded frame runner |
| `crates/gba-demos/src/tile_demo.rs` | Original ARM tile/sprite program, palettes, tiles, maps, and OAM image |
| `crates/gba-demos/src/affine_demo.rs` | Shared ARM background program builder and Mode 2 assets |
@ -84,6 +85,7 @@ The repository is a Cargo workspace with three crates:
| `crates/gba-core/tests/timers.rs` | Timer rules, interrupt registers, and a cycle-by-cycle reference |
| `crates/gba-core/tests/machine.rs` | Device IRQ entry/return, clock policy, and I/O failure atomicity |
| `crates/gba-core/tests/timing.rs` | WAITCNT fields, bus costs, and timer/IRQ timing integration |
| `crates/gba-core/tests/keypad.rs` | Keypad register widths, IRQ sampling, CPU/DMA ordering, HALT wake-up, diagnostics, and BIOS IntrWait |
| `crates/gba-core/tests/graphics.rs` | Video memory, rendering, KEYINPUT, and CPU-driven graphics integration |
| `crates/gba-core/tests/tiles.rs` | Mode 0 registers, maps, palettes, composition, diagnostics, and CPU tile/sprite demo |
| `crates/gba-core/tests/affine_backgrounds.rs` | Affine registers, maps, transforms, bitmap sampling, composition, and CPU demo |