Playing sound samples: Difference between revisions
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Revision as of 15:27, 26 June 2011
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.