597b02881b
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.
45 lines
948 B
Rust
45 lines
948 B
Rust
//! Platform-independent GBA button state. Bits are pressed-high here;
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//! the KEYINPUT register exposes their active-low hardware representation.
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mod keypad;
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pub(crate) use keypad::Keypad;
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#[derive(Debug, Clone, Copy, PartialEq, Eq)]
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#[repr(u16)]
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pub enum Button {
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A = 1 << 0,
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B = 1 << 1,
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Select = 1 << 2,
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Start = 1 << 3,
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Right = 1 << 4,
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Left = 1 << 5,
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Up = 1 << 6,
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Down = 1 << 7,
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R = 1 << 8,
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L = 1 << 9,
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}
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#[derive(Debug, Default, Clone, Copy, PartialEq, Eq)]
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pub struct Buttons(u16);
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impl Buttons {
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pub fn from_bits(bits: u16) -> Self {
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Self(bits & 0x03ff)
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}
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pub fn bits(self) -> u16 {
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self.0
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}
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pub fn with(self, button: Button, pressed: bool) -> Self {
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Self(if pressed {
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self.0 | button as u16
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} else {
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self.0 & !(button as u16)
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})
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}
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pub(crate) fn keyinput(self) -> u16 {
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!self.0 & 0x03ff
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}
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}
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