Playing sound samples: Difference between revisions
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Latest revision as of 04:49, 26 November 2015
ADPCM-A
Definitions of ADPCM-A registers:
;ADPCM-A reg defines
PA_CTRL: EQU $00
PA_MVOL: EQU $01
PA_CVOL: EQU $08
PA_STARTL: EQU $10
PA_STARTH: EQU $18
PA_ENDL: EQU $20
PA_ENDH: EQU $28
(Full list of defines here)
Example code to play back V ROM $000000-$00FFFF on CH1 with max volume.
;playback parameters
CHMASK: equ $01
MVOL: equ $3F
CVOL: equ $C0+$1F
START: equ $0000
END: equ $00FF
PlayADPCMA:
ld de,PA_MVOL<<8 +MVOL ;master volume
rst $18
ld de,PA_CVOL<<8 +CVOL ;left/right/channel volume
rst $18
ld de,PA_STARTL<<8 +START AND $FF ;start address low
rst $18
ld de,PA_STARTH<<8 +START / $100 ;start address high
rst $18
ld de,PA_ENDL<<8 +END AND $FF ;end address low
rst $18
ld de,PA_ENDH<<8 +END / $100 ;end address high
rst $18
ld de,PA_CTRL<<8 +CHMASK ;play this channel
rst $18
ret
RST $18 writes D reg to port $06 and E reg to port $07.
ADPCM-A demo
An interactive demo with source files can be found here.