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feat(audio): implement PSG pulse channel 2

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0xrsydn 2026-10-07 02:30:16 +07:00
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docs/architecture.md
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@ -54,9 +54,10 @@ The repository is a Cargo workspace with three crates:
| `crates/gba-core/src/cpu/fetch_boundary_tests.rs` | Actual fetch-region snapshots, split refills, IWRAM lane requirements, ROM-window boundaries, and nominal timing |
| `crates/gba-core/src/io.rs` | I/O registers, timers, HALT/STOP wake-up, next-event bounds, and IRQ latches |
| `crates/gba-core/src/audio.rs` | Direct Sound state, PSG sequencer, idle channel/wave banks, and instantaneous stereo mixing |
| `crates/gba-core/src/audio/pulse.rs` | Pulse channel 1 oscillator, length, envelope, sweep, and status |
| `crates/gba-core/src/audio/pulse.rs` | Shared pulse oscillator, length, envelope, and status; sweep is mapped only for channel 1 |
| `crates/gba-core/src/audio/pulse/tests.rs` | Exhaustive frequency/duty arithmetic and original modulation edge tests |
| `crates/gba-core/tests/pulse_sound.rs` | Register masks, stereo mixing, sequencer clocks, idle modes, batching, and explicit limits |
| `crates/gba-core/tests/pulse_sound/channel2.rs` | Channel 2 mapping, register gaps, independent state, shared clocks, and sum-before-rounding mixing |
| `crates/gba-core/tests/direct_sound.rs` | FIFO lanes/reset, signed mixing, timer selection, DMA refill, and HALT/STOP |
| `crates/gba-core/src/memory/audio_step_tests.rs` | Audio access phases, shadow validation, and CPU/DMA failure rollback |
| `crates/gba-core/src/io/inactive.rs` | Disconnected serial initialization with explicit unsupported-activity validation |