Audio

The audio engine has four Major components :

• audio
• tracker
• instruments
• sfx

The audio module handles hardware initialization, song playback, sound effect playback and CH3 wavetable.

[!INFO] Song Playback Song Playback is handled as follows :

• audio initialise trackers on specific songs
• trackers interpret a list of instructions and pass notes to play to instruments
• instruments play individual notes on each channels

Audio tracks must follow the Song format SFX must follow the SFX format

Audio module

Main audio module Contains the main audio control routines.

Control routines :

• Audio_init(b = playback speed)
• Audio_off()
• Audio_load song([hl] = (8 bytes) song structure)
• Audio_start_song()
• Audio_stop_song()
• Audio_set_wave_pattern([hl] = (16 bytes) wave pattern)

Timed_routines :

• Audio_update()

Tracker module

State Machine

SFX module

Sound effect module Handles sound effects on top of songs playback.

Control routines :

• sfx_request(a = sfx control byte)
  • sfx control byte has format : %ccpxxxxx
    • %cc : channel
    • %p : priority bit (1 = high priority)
    • %xxxxx : sfx id

Timed_routines :

• sfx_update()