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fix(serial): gate RCNT interrupt and Joybus controls by mode

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0xrsydn 2026-10-07 03:10:04 +07:00
commit 86f8663904
7 changed files with 203 additions and 20 deletions
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@ -142,6 +142,7 @@ The [audio subset](hardware/audio.md) supports Direct Sound, both PSG pulse chan
It does not yet provide a continuous sample stream. Wave channel 3 playback and unverified sound-DMA pairings remain diagnostic.
PSG timing and signed mixing are nominal; hardware startup edges and analog behavior remain unverified.
The [serial initialization subset](hardware/serial.md) supports idle normal data and disconnected general-purpose pins, not active transfers.
RCNT retains inactive bits 8/14 in normal mode. Effective GPIO interrupt enable and Joybus selection remain diagnostic.
Mapped I/O covers DMA, timers, interrupts, WAITCNT, display control/status, background control/scroll/affine registers, window/effect registers, KEYINPUT/KEYCNT, POSTFLG, and HALTCNT.
Keypad IRQs use a documented polling model; hardware retrigger edges and asynchronous input timing remain unverified.
STOP implements keypad wake only. Serial/Game Pak wake sources, oscillator restart delays, and exact wake timing remain unimplemented or unverified.
@ -151,9 +152,10 @@ ROM files can run in bounded terminal mode or a window with the original BIOS re
ROM windows have no demo-specific startup checks. Input is sampled between bounded execution slices.
Audio, saves, and external BIOS loading remain unavailable. ROM loading does not establish commercial-game compatibility.
A local Emerald run now completes its all-device reset and master sound enable.
It also passes the pulse and noise triggers, then stops explicitly at GPIO serial interrupt enable (`0x04000135`).
No title-screen, gameplay, or audible-game compatibility is established.
Its captured startup frames do not establish title-screen or gameplay compatibility. See [the startup result](research/emerald-reset.md).
It also passes the pulse/noise triggers and normal-mode RCNT configuration.
It next stops on an attempted write to address zero in the BIOS replacement at PC `0x00000378`.
The cause remains under investigation. No title-screen, gameplay, or audible-game compatibility is established.
See [the startup result](research/emerald-reset.md) for the bounded run and next investigation.
See [cartridge loading](hardware/cartridge.md) for file limits, step budgets, and exit status.
The [ROM suite runner](rom-tests.md) has original regressions and a [pinned public ARM baseline](public-arm-tests.md).
The pinned public ARM ROM passes its result checkpoint in debug and release builds.