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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4
crates/gba-core/tests/bios/ram_reset.rs
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@ -4,7 +4,7 @@ use gba_core::{
dma::{DmaError, DMA_BASE, DMA_STRIDE},
input::Buttons,
io::{
BG0CNT, BG2PA, BG2PD, BG3PA, BG3PD, BLDALPHA, BLDCNT, DISPCNT, GREENSWAP, KEYINPUT,
BG0CNT, BG2PA, BG2PD, BG3PA, BG3PD, BLDALPHA, BLDCNT, DISPCNT, GREENSWAP, KEYCNT, KEYINPUT,
WAITCNT, WININ, WINOUT,
},
memory::{OAM_START, PALETTE_START},
@ -236,6 +236,7 @@ fn io_reset_clears_readable_controls_but_keeps_input_postflg_and_green_swap() {
let (mut m, pc) = prepare(flags, false, 0x9f);
m.memory_mut().set_buttons(Buttons::from_bits(0x251));
let keys = m.memory().read16(KEYINPUT).unwrap();
m.memory_mut().write16(KEYCNT, 0x4001).unwrap();
m.memory_mut().write16(GREENSWAP, 1).unwrap();
for address in [
BG0CNT,
@ -277,6 +278,7 @@ fn io_reset_clears_readable_controls_but_keeps_input_postflg_and_green_swap() {
}
assert_eq!(m.memory().read16(DISPSTAT).unwrap() & 0xff38, 0);
assert_eq!(m.memory().read16(KEYINPUT).unwrap(), keys);
assert_eq!(m.memory().read16(KEYCNT).unwrap(), 0x4001); // Current reset subset preserves KEYCNT.
assert_eq!(m.memory().read16(POSTFLG).unwrap(), 1);
assert_eq!(m.memory().read16(GREENSWAP).unwrap(), 1);
assert!(m.cycles() > cycles);