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sound.asm
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sound.asm
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INCLUDE "include/sound.inc"
INCLUDE "include/constants.inc"
SECTION "Sound", HOME
DefaultWave::
DB $ff, $ee, $dd, $cc, $bb, $aa, $99, $88
DB $77, $66, $55, $44, $33, $22, $11, $00
Initialize_Sound::
ld a, $ff
ld [rNR52], a ; enable all sound
ld a, $ff
ld [rNR51], a ; output all sound channels to L+R terminals
ld a, $77
ld [rNR50],a ; set each output terminal volumne to max
; Load default wave pattern
ld b, 0
ld hl, DefaultWave
ld de, WAVE_PATTERN_RAM
; Turn wave channel on
ld a, $80
ld [rNR30], a
.loop
ld a, [hl+]
ld [de], a
inc de
inc b
ld a, b
cp 16
jp nz, .loop
ret
; PlaySound_1
; a = sweep env
; b = duty/length
; c = volume env
; de = frequency
; h = loop/count
PlaySound_1::
ld [rNR10],a
ld a, b
ld [rNR11], a
ld a, c
ld [rNR12], a
ld a, e
ld [rNR13], a
ld a, d
or h
or RESTART_SOUND
ld [rNR14], a
ret
; PlaySound_2
; b = duty/length
; c = volume env
; de = frequency
; h = loop/count
PlaySound_2::
ld a, b
ld [rNR21], a
ld a, c
ld [rNR22], a
ld a, e
ld [rNR23], a
ld a, d
or h
or RESTART_SOUND
ld [rNR24], a
ret
; PlaySound_3
; b = length
; c = volume
; de = frequency
; h = loop/count
PlaySound_3::
ld a, $80
ld [rNR30], a
ld a, b
ld [rNR31], a
ld a, c
ld [rNR32], a
ld a, e
ld [rNR33], a
ld a, d
or h
or RESTART_SOUND
ld [rNR34], a
ret
; PlaySound_4
; b = length
; c = volume envelope
; d = poly counter
; e = loop/count
PlaySound_4::
ld a, b
ld [rNR41], a
ld a, c
ld [rNR42], a
ld a, d
ld [rNR43], a
ld a, e
or RESTART_SOUND
ld [rNR44], a
ret
StopSound_1::
ld a, $00
ld [rNR12], a
ld a, RESTART_SOUND | COUNT_SOUND
ld [rNR14], a
ret
StopSound_2::
ld a, $00
ld [rNR22], a
ld a, RESTART_SOUND | COUNT_SOUND
ld [rNR24], a
ret
StopSound_3::
ld a, WAVE_VOL_MUTE
ld [rNR32], a
ld a, RESTART_SOUND | COUNT_SOUND
ld [rNR34], a
ret
StopSound_4:
ld a, $00
ld [rNR42], a
ld a, RESTART_SOUND | COUNT_SOUND
ld [rNR44], a
ret
StopAllSound:
call StopSound_1
call StopSound_2
call StopSound_3
call StopSound_4
ret