Crate psx_io 

Volatile MMIO primitives.

The lowest layer of the SDK. Wraps core::ptr::read_volatile / write_volatile in zero-overhead helpers that each peripheral module builds on. Keeping these centralised means we can audit every MMIO touchpoint in one file.

All functions here are #[inline(always)] and unsafe – they accept arbitrary addresses and widths. Higher-level SDK crates present safe APIs on top of these.

Modules

cd

CD-ROM drive: commands, responses, sector polling, CD-DA playback in audio, XA-ADPCM music in xa and polled data-sector reads in reader.

cdda

Renamed to crate::cd::audio.

cdrom

Renamed to crate::cd.

controller_port

The controller and memory-card port: one serial transport shared by every driver on it.

disc_base

Where this program’s data sits on the disc it was booted from.

dma

DMA controller.

gpu

GPU MMIO: GP0, GP1, GPUREAD, GPUSTAT.

irq

Interrupt controller: pending and enabled sources.

periph

Zero-size ownership tokens for peripherals with shared state.

timers

Root counter (timer) MMIO. Three 16-bit counters, each with counter / mode / target registers. Mode bits select the clock source and IRQ behaviour. Register addresses and the mode bits live in [psx_hw::timers].

Functions

read8^⚠Deprecated

Renamed to read_u8.

read_u8^⚠

Read an 8-bit byte from addr.

read_u16^⚠

Read a 16-bit half-word from addr.

read_u32^⚠

Read a 32-bit word from addr. Caller must guarantee addr is valid MMIO for a 32-bit read.

write8^⚠Deprecated

Renamed to write_u8.

write_u8^⚠

Write an 8-bit byte to addr.

write_u16^⚠

Write a 16-bit half-word to addr.

write_u32^⚠

Write a 32-bit word to addr.