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APU Control

A module used by the engine module for determining the register writes needed by an ApuOperation object.

This module is part of the inner workings of the engine module, and has an unstable API.

Imports

Types

ApuWrite = tuple[regaddr, value: uint8]: Tuple for an APU register write. Consists of an address in the $FF00 page and a value to write. Source Edit
ApuWriteList = FixedSeq[64, ApuWrite]: A container for a list of APU writes. Source Edit

proc clearChannel(chno: ChannelId; writes: var ApuWriteList) {....raises: [], tags: [], forbids: [].}: Adds the writes needed to the list to clear a given channel. Source Edit
func getWrites(op: ApuOperation; wt: WaveformTable; nr51: uint8): ApuWriteList {. ...raises: [], tags: [], forbids: [].}: Gets the list of writes needed for a given operation.
op: the operation

wt: the waveform table to use

nr51: the current value of APU register NR51

A list of register writes is returned.
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func nr43(state: ChannelState): uint8 {....raises: [], tags: [], forbids: [].}: Source Edit