/
sm_spc.asm
3314 lines (2984 loc) · 84.6 KB
/
sm_spc.asm
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;*
;* Copyright 2009 Mukunda Johnson (mukunda.com)
;*
;* This file is part of SNESMOD - gh.mukunda.com/snesmod
;*
;* See LICENSING.txt
;*
#define DEBUGINC inc debug \ mov SPC_PORT0, debug
.define LBYTE(z) (z & 0FFh)
.define HBYTE(z) (z >> 8)
.define SPROC TCALL 0
.define SPROC2 SPROC
;********************************************************
; PROTOCOL
;
; mm = mimic data
; id = message id
; vv = validation data (not previous value)
; v1 = nonzero validation data (not previous value)
;
; SPC PORTS:
; PORT0 = RESERVED
; PORT1 = COMMUNICATION
; PORT2 = STATUS:
; MSB fep-cccc LSB
; f = module volume fade[out/in] in progress
; e = end of module reached (restarted from beginning)
; p = module is playing (0 means not playing or preparing...)
; cccc = cue, incremented on SF1 pattern effect
; PORT3 = MODULE POSITION
;
; NAME ID DESC
;--------------------------------------------------------
; LOAD 00 Upload Module
;
; >> id vv -- -- send message
; << -- mm -- -- message confirmed
;
; >> -- v1 DD DD transfer module
; << -- mm -- -- DDDD = data, loop until all words xferred
;
; >> -- 00 DD DD final word
; << -- mm -- -- okay proceed to transfer sources...
;
; for each entry in SOURCE_LIST:
;
; >> 01 vv LL LL send loop point
; << -- mm -- -- loop point saved
; >> -- v1 DD DD transfer source data
; << -- mm -- -- DDDD = data, loop unti all words xferred
;
; >> -- 00 DD DD transfer last word
; << -- mm -- --
;
; [loop until all needed sources are transferred]
;
; >> 00 vv -- -- terminate transfer
; << -- mm -- --
;
; notes:
; this function resets the memory system
; all sound effects will become invalid
;
; after final sample transferred the system may
; be halted for some time to setup the echo delay.
;--------------------------------------------------------
; LOADE 01 Upload Sound Effect
;
; >> id vv LL LL send message
; << -- mm -- -- source registered, ready for data
;
; >> -- v1 DD DD transfer source data
; << -- mm -- -- loop until all words xferred
;
; >> -- 00 DD DD send last word
; << -- mm -- -- okay, ready for playback
;
; sound effects are always one-shot
; LLLL is not used (or maybe it is...........)
;--------------------------------------------------------
; VOL 02 Set Master Volume
;
; >> id vv VV --
; << -- mm -- --
;
; VV = master volume level (0..127)
;--------------------------------------------------------
; PLAY 03 Play Module
;
; >> id vv -- pp
; << -- mm -- --
;
; pp = start position
;--------------------------------------------------------
; STOP 04 Stop Playback
;
; >> id vv -- --
; << -- mm -- --
;--------------------------------------------------------
; MVOL 05 Set Module Volume
;
; >> id vv -- VV
; << -- mm -- --
;
; VV = 0..255 new module volume scale
;--------------------------------------------------------
; FADE 06 Fade Module Volume
;
; >> id vv tt VV
; << -- mm -- --
;
; VV = 0..255 target volume level
; tt = fade speed (added every m tick)
;--------------------------------------------------------
; RES 07 Reset
;
; >> id vv -- --
;
; <driver unloaded>
;--------------------------------------------------------
; FX 08 Play Sound Effect
;
; >> id vv vp sh
; << -- mm -- --
;
; s = sample index
; h = pitch ( 8 = 32000hz, h = pitch height >> 9 )
; v = volume (15 = max)
; p = panning (8 = center)
;--------------------------------------------------------
; TEST 09 Test function
;
; >> id vv -- --
; << -- mm -- --
;--------------------------------------------------------
; SSIZE 0A Set sound region size
;
; >> id vv -- SS
; << -- mm -- --
;
; SS = size of sound region (SS*256 bytes)
;--------------------------------------------------------
; STREAM Update digital stream
;
; previously written port data must be buffered.
;
; >> 8m -- -- -- send update flag (8m = previous data OR 80H)
; [wait for spc, this is a high-priority signal]
; << 80 -- -- -- receive ready signal
;
; >> nn mm vp hh nn = number of blocks (9 bytes) to transfer (1..28)
; << nn -- -- --
;
; if mm <> 0 then
; [new sample, reset sound]
; v = volume
; p = panning
; hh = pitch height H byte (6 bits)
;
; length should be significantly larger than required on
; initial transfer (mm<>0)
;
; [xx is a counter starting with 'nn' written to port0 earlier]
; [add 1 before first message]
;
; transfer 1 chunk:
; loop 3 times:
; >> xx D2 D0 D1
; << xx -- -- --
; >> xx D5 D3 D4
; << xx -- -- --
; >> xx D8 D6 D7
; << xx -- -- --
; loop nn times
;
;(EXIT):
; [spc will resume operation after a short period]
; [port status must be restored before the spc resumes (approx. 45us)]
; >> pp pp pp pp restore port status
;********************************************************
;*****************************************************************************************
; registers
;*****************************************************************************************
SPC_TEST =0F0h ; undocumented
SPC_CONTROL =0F1h ; control register
SPC_DSP =0F2h
SPC_DSPA =0F2h
SPC_DSPD =0F3h
SPC_PORT0 =0F4h ; i/o port0
SPC_PORT1 =0F5h ; i/o port1
SPC_PORT2 =0F6h ; i/o port2
SPC_PORT3 =0F7h ; i/o port3
SPC_FLAGS =0F8h ; custom flags
SPC_TIMER0 =0FAh ; timer0 setting
SPC_TIMER1 =0FBh ; timer1 setting
SPC_TIMER2 =0FCh ; timer2 setting
SPC_COUNTER0 =0FDh ; timer0 counter
SPC_COUNTER1 =0FEh ; timer1 counter
SPC_COUNTER2 =0FFh ; timer2 counter
DEBUG_P0 = SPC_PORT0
DEBUG_P2 = SPC_PORT2
;*****************************************************************************************
; dsp registers
;*****************************************************************************************
DSPV_VOL =00h
DSPV_VOLR =01h
DSPV_PL =02h
DSPV_PH =03h
DSPV_SRCN =04h
DSPV_ADSR1 =05h
DSPV_ADSR2 =06h
DSPV_GAIN =07h
DSPV_ENVX =08h
DSPV_OUTX =09h
DSP_MVOL =0Ch
DSP_MVOLR =1Ch
DSP_EVOL =2Ch
DSP_EVOLR =3Ch
DSP_KON =4Ch
DSP_KOF =5Ch
DSP_FLG =6Ch
DSP_ENDX =7Ch
DSP_EFB =0Dh
DSP_PMON =2Dh
DSP_NON =3Dh
DSP_EON =4Dh
DSP_DIR =5Dh
DSP_ESA =6Dh
DSP_EDL =7Dh
DSP_C0 =0Fh
DSP_C1 =1Fh
DSP_C2 =2Fh
DSP_C3 =3Fh
DSP_C4 =4Fh
DSP_C5 =5Fh
DSP_C6 =6Fh
DSP_C7 =7Fh
FLG_RESET =80h
FLG_MUTE =40h
FLG_ECEN =20h
#define SETDSP(xx,yy) mov SPC_DSPA, #xx\ mov SPC_DSPD, #yy
;*****************************************************************************************
; module defs
;*****************************************************************************************
MOD_IV =00H ; INITIAL VOLUME
MOD_IT =01H ; INITIAL TEMPO
MOD_IS =02H ; INITIAL SPEED
MOD_CV =03H ; INITIAL CHANNEL VOLUME
MOD_CP =0BH ; INITIAL CHANNEL PANNING
MOD_EVOL =13H ; ECHO VOLUME (LEFT)
MOD_EVOLR =14H ; ECHO VOLUME (RIGHT)
MOD_EDL =15H ; ECHO DELAY
MOD_EFB =16H ; ECHO FEEDBACK
MOD_EFIR =17H ; ECHO FIR COEFS
MOD_EON =1FH ; ECHO ENABLE BITS
MOD_SEQU =20H ; SEQUENCE
MOD_PTABLE_L =0E8H ; PATTERN TABLE
MOD_PTABLE_H =128H ;
MOD_ITABLE_L =168H ; INSTRUMENT TABLE
MOD_ITABLE_H =1A8H ;
MOD_STABLE_L =1E8H ; SAMPLE TABLE
MOD_STABLE_H =228H ;
INS_FADEOUT =00H
INS_SAMPLE =01H
INS_GVOL =02H
INS_SETPAN =03H
INS_ENVLEN =04H
INS_ENVSUS =05H
INS_ENVLOOPST =06H
INS_ENVLOOPEND =07H
INS_ENVDATA =08H
SAMP_DVOL =00H
SAMP_GVOL =01H
SAMP_PITCHBASE =02H
SAMP_DINDEX =04H
SAMP_SETPAN =05H
;*****************************************************************************************
; zero-page memory
;*****************************************************************************************
xfer_address: .block 2
m0: .block 2
m1: .block 2
m2: .block 2
m3: .block 2
m4: .block 2
m5: .block 2
m6: .block 2
next_sample: .block 1
comms_v: .block 1 ;communication variable
evol_l: .block 1
evol_r: .block 1
module_vol: .block 1 ;module volume
module_fadeT: .block 1 ;module volume fade target
module_fadeR: .block 1 ;module volume fade rate
module_fadeC: .block 1 ;timer counter
mod_tick: .block 1
mod_row: .block 1
mod_position: .block 1
mod_bpm: .block 1
mod_speed: .block 1
mod_active: .block 1
mod_gvol: .block 1
patt_addr: .block 2
patt_rows: .block 1
pattjump_enable: .block 1
pattjump_index: .block 1
patt_update: .block 1 ;PATTERN UPDATE FLAGS
ch_start:
ch_pitch_l: .block 8
ch_pitch_h: .block 8
ch_volume: .block 8 ;0..64
ch_cvolume: .block 8 ;0..128 (IT = 0..64)
ch_panning: .block 8 ;0..64
ch_cmem: .block 8
ch_note: .block 8
ch_instr: .block 8
ch_vcmd: .block 8
ch_command: .block 8
ch_param: .block 8
ch_sample: .block 8
ch_flags: .block 8
ch_env_y_l: .block 8
ch_env_y_h: .block 8
ch_env_node: .block 8
ch_env_tick: .block 8
ch_fadeout: .block 8
ch_end:
; channel processing variables:
t_hasdata: .block 1
t_sampoff: .block 1
t_volume: .block 1
t_panning: .block 1
t_pitch:
t_pitch_l: .block 1
t_pitch_h: .block 1
t_flags: .block 1
t_env: .block 1 ; 0..255
p_instr: .block 2
STATUS: .block 1
STATUS_P =32
STATUS_E =64
STATUS_F =128
debug: .block 1
CF_NOTE =1
CF_INSTR =2
CF_VCMD =4
CF_CMD =8
CF_KEYON =16
CF_FADE =32
CF_SURROUND =64
TF_START =80H
TF_DELAY =2
;---------------------------
; sound effects
;---------------------------
sfx_mask: .block 1
sfx_next: .block 1
;-----------------------------------------------------------------------------------------
stream_a: .block 1
stream_write: .block 2
stream_rate: .block 1
stream_volL: .block 1
stream_volR: .block 1
stream_gain: .block 1
stream_initial: .block 1
stream_size: .block 1
stream_region: .block 1
;*****************************************************************************************
; sample directory
;*****************************************************************************************
SampleDirectory =0200h ; 256 bytes (64-sample directory)
EffectDirectory =0300h ; 16*4 bytes (16 sound effects)
StreamAddress =0340h ; 4 bytes (streaming buffer address)
PatternMemory =0380h ; 16*8 bytes
; [extra ram]
;*****************************************************************************************
; program (load @ 400h)
;*****************************************************************************************
;--------------------------------------------------------
.org 400h
;--------------------------------------------------------
;--------------------------------------------------------
main:
;--------------------------------------------------------
mov x, #0
mov a, #0
_clrmem:
mov (X)+, a
cmp x, #0F0h
bne _clrmem
mov SPC_PORT1, #0 ; reset some ports
mov SPC_PORT2, #0 ;
mov SPC_PORT3, #0 ;
mov SPC_CONTROL, #0 ; reset control
mov SPC_TIMER1, #255 ; reset fade timer
mov module_vol, #255 ; reset mvol
mov module_fadeT, #255 ;
;----------------
call ResetSound ;
;----------------
mov SPC_DSPA, #DSP_MVOL ; reset main volume
mov SPC_DSPD, #80 ;
mov SPC_DSPA, #DSP_MVOLR ;
mov SPC_DSPD, #80 ;
;----------------
mov SPC_DSPA, #DSP_DIR ; set source dir
mov SPC_DSPD, #SampleDirectory >> 8
call ResetMemory
call Streaming_Init
mov SPC_CONTROL, #%110
;----------------------------------------------------------------------
bra patch1 ; patch for it->spc conversion
;
call Module_Stop ;
mov a, #0 ;
call Module_Start ;
patch1: ;
;----------------------------------------------------------------------
;--------------------------------------------------------
main_loop:
;--------------------------------------------------------
SPROC2
call ProcessComms
SPROC
call ProcessFade
SPROC
call Module_Update
SPROC
call UpdatePorts
SPROC
call SFX_Update
bra main_loop
;--------------------------------------------------------
UpdatePorts:
;--------------------------------------------------------
mov SPC_PORT2, STATUS
mov SPC_PORT3, mod_position
ret
;--------------------------------------------------------
ResetMemory:
;--------------------------------------------------------
mov xfer_address, #MODULE & 0FFh ; reset transfer address
mov xfer_address+1, #MODULE >> 8 ;
mov next_sample, #0 ; reset sample target
ret
;--------------------------------------------------------
ResetSound:
;--------------------------------------------------------
SETDSP( DSP_KOF, 0FFh );
SETDSP( DSP_FLG, FLG_ECEN );
SETDSP( DSP_PMON, 0 );
SETDSP( DSP_EVOL, 0 );
SETDSP( DSP_EVOLR, 0 );
SETDSP( DSP_NON, 00h );
SETDSP( DSP_KOF, 000h ); this is weird
mov sfx_mask, #0
ret
;--------------------------------------------------------
ProcessComms:
;--------------------------------------------------------
cmp comms_v, SPC_PORT1 ; test for command
bne _new_message ;
ret ; <no message>
_new_message:
mov comms_v, SPC_PORT1 ; copy V
mov a, SPC_PORT0 ; jump to message
nop ; verify data
cmp a, SPC_PORT0 ;
bne _new_message ;
and a, #127 ; mask 7 bits
asl a ;
mov x, a ;
jmp [CommandTable+x] ;'
;--------------------------------------------------------
CommandRet:
mov SPC_PORT1, comms_v
ret
;--------------------------------------------------------
CommandTable:
;--------------------------------------------------------
.word CMD_LOAD ; 00h - load module
.word CMD_LOADE ; 01h - load sound
.word CMD_VOL ; 02h - set volume
.word CMD_PLAY ; 03h - play
.word CMD_STOP ; 04h - stop
.word CMD_MVOL ; 05h - set module volume
.word CMD_FADE ; 06h - fade module volume
.word CMD_RES ; 07h - reset
.word CMD_FX ; 08h - sound effect
.word CMD_TEST ; 09h - test
.word CMD_SSIZE ; 0Ah - set stream size
; .word CMD_PDS ; 0Ah - play streamed sound
; .word CMD_DDS ; 0Bh - disable digital stream
;********************************************************
CMD_LOAD:
;********************************************************
call Module_Stop
call ResetMemory ; reset memory system
call StartTransfer
mov m1, #0
_wait_for_sourcen: ;
cmp comms_v, SPC_PORT1 ;
beq _wait_for_sourcen ;
mov comms_v, SPC_PORT1 ;
cmp SPC_PORT0, #0 ; if p0 != 0:
beq _end_of_sources ; load source
;
mov y, m1 ;
clrc ;
adc m1, #4 ;
call RegisterSource ;
call StartTransfer ;
;
bra _wait_for_sourcen ; load next source
_end_of_sources: ; if p0 == 0:
jmp CommandRet ;
;-------------------------------------------------------------------
RegisterSource:
;-------------------------------------------------------------------
mov a, xfer_address
mov !SampleDirectory+y, a
clrc
adc a, SPC_PORT2
mov !SampleDirectory+2+y, a
mov a, xfer_address+1
mov !SampleDirectory+1+y, a
adc a, SPC_PORT3
mov !SampleDirectory+3+y, a
ret
;-------------------------------------------------------------------
StartTransfer:
;-------------------------------------------------------------------
mov x, comms_v ; start transfer
mov y, #0 ;
mov SPC_PORT1, x ;
;-------------------------------------------------------------------
DoTransfer:
;-------------------------------------------------------------------
cmp x, SPC_PORT1 ; wait for data
beq DoTransfer ;
mov x, SPC_PORT1 ;
;---------------------------
mov a, SPC_PORT2 ; copy data
mov [xfer_address]+y, a ;
mov a, SPC_PORT3 ;
mov SPC_PORT1, x ;<- reply to snes
inc y ;
mov [xfer_address]+y, a ;
inc y ;
beq _inc_address ; catch index overflow
_cont1: cmp x, #0 ; loop until x=0
bne DoTransfer ;
mov m0, y
clrc
adc xfer_address, m0
adc xfer_address+1, #0
mov comms_v, x
ret
_inc_address:
inc xfer_address+1
bra _cont1
;********************************************************
CMD_LOADE:
;********************************************************
mov a, xfer_address
mov y, next_sample
mov !EffectDirectory+y, a
clrc
adc a, SPC_PORT2
mov !EffectDirectory+2+y, a
mov a, xfer_address+1
mov !EffectDirectory+1+y, a
adc a, SPC_PORT3
mov !EffectDirectory+3+y, a
clrc ; safety clear for invalid loop points (thanks KungFuFurby)
adc next_sample, #4
call StartTransfer
jmp CommandRet
;********************************************************
CMD_VOL:
;********************************************************
mov a, SPC_PORT2
mov SPC_DSPA, #DSP_MVOL
mov SPC_DSPD, a
mov SPC_DSPA, #DSP_MVOLR
mov SPC_DSPD, a
call UpdateEchoVolume
jmp CommandRet
;********************************************************
CMD_PLAY:
;********************************************************
call Module_Stop
mov a, SPC_PORT3
and STATUS, #~STATUS_P
mov SPC_PORT2, STATUS
mov SPC_PORT1, comms_v
jmp Module_Start
;********************************************************
CMD_STOP:
;********************************************************
call Module_Stop
jmp CommandRet
;********************************************************
CMD_MVOL:
;********************************************************
mov module_vol, SPC_PORT3
mov module_fadeT, SPC_PORT3
jmp CommandRet
;********************************************************
CMD_FADE:
;********************************************************
or STATUS, #STATUS_F
mov SPC_PORT2, STATUS
mov module_fadeT, SPC_PORT3
mov module_fadeR, SPC_PORT2
jmp CommandRet
;********************************************************
CMD_RES:
;********************************************************
mov SPC_DSPA, #DSP_FLG
mov SPC_DSPD, #11100000b
clrp
mov SPC_CONTROL, #10000000b ;
jmp 0FFC0h
;********************************************************
CMD_FX:
;********************************************************
movw ya, SPC_PORT2
movw m0, ya
mov SPC_PORT1, comms_v
jmp SFX_Play
;********************************************************
CMD_TEST:
;********************************************************
SETDSP( 00h, 7fh )
SETDSP( 01h, 7fh )
SETDSP( 02h, 00h )
SETDSP( 03h, 10h )
SETDSP( 04h, 09h )
SETDSP( 05h, 00h )
SETDSP( 06h, 00h )
SETDSP( 07h, 7fh )
SETDSP( 0Ch, 70h )
SETDSP( 1Ch, 70h )
SETDSP( 4Ch, 01h )
jmp CommandRet
;********************************************************
CMD_SSIZE:
;********************************************************
call Module_Stop
mov a, SPC_PORT3
call Streaming_Resize
jmp CommandRet
;********************************************************
CMD_DDS:
;********************************************************
; call Streaming_Deactivate
; jmp CommandRet
;********************************************************
; Setup echo...
;********************************************************
SetupEcho:
SETDSP( DSP_FLG, 00100000b );
SETDSP( DSP_EVOL, 0 );
SETDSP( DSP_EVOLR, 0 );
mov a, !MODULE+MOD_EVOL
mov evol_l, a
mov a, !MODULE+MOD_EVOLR
mov evol_r, a
mov a, !MODULE+MOD_EDL ; ESA = stream_region - EDL*8
xcn a ; max = stream_region -1
lsr a ;
mov m0, a ;
mov a, stream_region ;
setc ;
sbc a, m0 ;
cmp a, stream_region ;
bne _edl_not_ss ;
dec a ;
_edl_not_ss: ;
mov SPC_DSPA, #DSP_ESA ;
mov SPC_DSPD, a ;
mov m0+1, a ; clear memory region used by echo
mov m0, #0 ;
mov a, #0 ;
mov y, #0 ;
_clearmem: ;
mov [m0]+y, a ;
inc y ;
bne _clearmem ;
inc m0+1 ;
cmp m0+1, stream_region ;
bne _clearmem ;
setc ; copy FIR coefficients
mov SPC_DSPA, #DSP_C7 ;
mov y, #7 ;
_copy_coef: ;
mov a, !MODULE+MOD_EFIR+y ;
mov SPC_DSPD, a ;
sbc SPC_DSPA, #10h ;
dec y ;
bpl _copy_coef ;
mov SPC_DSPA, #DSP_EFB ; copy EFB
mov a, !MODULE+MOD_EFB ;
mov SPC_DSPD, a ;
mov SPC_DSPA, #DSP_EON ; copy EON
mov a, !MODULE+MOD_EON ;
mov SPC_DSPD, a ;
mov SPC_DSPA, #DSP_EDL ; read old EDL, set new EDL
mov y, SPC_DSPD ;
mov a, !MODULE+MOD_EDL ;
mov SPC_DSPD, a ;
;-----------------------------------------
; delay EDL*16ms before enabling echo
; 16384 clks * EDL
; EDL<<14 clks
;
; run loop EDL<<10 times
;-----------------------------------------
mov a, y ;
asl a ;
asl a ;
inc a
mov m0+1, a ;
mov m0, #0 ;
_delay_16clks: ;
cmp a, [0]+y ;
decw m0 ;
bne _delay_16clks ;
mov a, !MODULE+MOD_EDL
beq _skip_enable_echo
call UpdateEchoVolume
mov SPC_DSPA, #DSP_FLG ; clear ECEN
mov SPC_DSPD, #0
ret
_skip_enable_echo:
mov evol_l, #0
mov evol_r, #0
ret
;********************************************************
; set echo volume with master scale applied
;********************************************************
UpdateEchoVolume:
mov SPC_DSPA, #DSP_MVOL ; set EVOL scaled by main volume
mov a, SPC_DSPD ;
asl a ;
mov m0, a ;
mov SPC_DSPA, #DSP_EVOL ;
mov y, evol_l ;
mul ya ;
mov a, y ;
mov y, evol_l ;
bpl _plus ;
setc ;
sbc a, m0 ;
_plus: mov SPC_DSPD, a ;
mov a, m0 ; set EVOLR scaled by main volume
mov SPC_DSPA, #DSP_EVOLR ;
mov y, evol_r ;
mul ya ;
mov a, y ;
mov y, evol_r ;
bpl _plusr ;
setc ;
sbc a, m0 ;
_plusr: mov SPC_DSPD, a ;
ret
;********************************************************
; zerofill channel data
;********************************************************
Module_ResetChannels:
mov x, #ch_start
mov a, #0
_zerofill_ch:
mov (x)+, a
cmp x, #ch_end
bne _zerofill_ch
ret
Module_Stop:
call ResetSound
mov SPC_CONTROL, #%110
mov mod_active, #0
ret
;********************************************************
; play module...
;
; a = initial position
;********************************************************
Module_Start:
mov mod_position, a
call ResetSound
call Module_ResetChannels
mov mod_active, #1
mov a, !MODULE+MOD_IS
mov mod_speed, a
mov a, !MODULE+MOD_IT
call Module_ChangeTempo
mov a, !MODULE+MOD_IV
mov mod_gvol, a
mov x, #7 ;
_copy_cvolume: ; copy volume levels
mov a, !MODULE+MOD_CV+x ;
mov ch_cvolume+x, a ;
dec x ;
bpl _copy_cvolume ;
mov x, #7
_copy_cpan:
mov a, !MODULE+MOD_CP+x
cmp a, #65
bcs _cpan_surround
mov ch_panning+x, a
bra _cpan_normal
_cpan_surround:
mov a, #32
mov ch_panning+x, a
mov a, #CF_SURROUND
mov ch_flags+x, a
_cpan_normal:
dec x
bpl _copy_cpan
call SetupEcho
mov a, mod_position
call Module_ChangePosition
; start timer
mov SPC_CONTROL, #%111
or STATUS, #STATUS_P
mov SPC_PORT2, STATUS
SETDSP( DSP_KOF, 0 ); // ??????
ret
;********************************************************
; set sequence position
;
; a=position
;********************************************************
Module_ChangePosition:
mov y, a
_skip_pattern:
mov a, !MODULE+MOD_SEQU+y
cmp a, #254 ; skip +++
bne _not_plusplusplus ;
inc y ;
bra _skip_pattern ;
_not_plusplusplus:
cmp a, #255 ; restart on ---
bne _not_end ;
mov y, #0 ;
bra _skip_pattern ;
_not_end:
mov mod_position, y
mov y, a
mov a, !MODULE+MOD_PTABLE_L+y
mov patt_addr, a
mov a, !MODULE+MOD_PTABLE_H+y
mov patt_addr+1, a
mov y, #0
mov a, [patt_addr]+y
mov patt_rows, a
incw patt_addr
mov pattjump_enable, #0
mov mod_tick, #0
mov mod_row, #0
ret
;********************************************************
; a = new BPM value
;********************************************************
Module_ChangeTempo:
push x
mov mod_bpm, a
mov SPC_CONTROL, #%110
mov x, a
mov y, #50h
mov a, #00h
div ya, x
mov SPC_TIMER0, a
pop x
ret
;********************************************************
; process module fading
;********************************************************
ProcessFade:
mov a, SPC_COUNTER1