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dolphin/docs/DSP/free_dsp_rom/dsp_rom.ds

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IROM_BASE: equ 0x8000
lri $CR, #0x00ff
lri $SR, #0x2000
si @DMBH, #0x8071
si @DMBL, #0xfeed
mainloop:
clr $ACC1
clr $ACC0
call wait_for_cpu_mbox+#IROM_BASE
;mmem-addr
param1:
lr $AC1.M, @CMBL
lri $AC0.M, #0xa001
cmp
jnz param2+#IROM_BASE
call wait_for_cpu_mbox+#IROM_BASE
lr $IX0, @CMBH
lr $IX1, @CMBL
jmp mainloop+#IROM_BASE
;iram-addr
param2:
lri $AC0.M, #0xc002
cmp
jnz param3+#IROM_BASE
call wait_for_cpu_mbox+#IROM_BASE
lr $IX2, @CMBL
jmp mainloop+#IROM_BASE
;iram-length
param3:
lri $AC0.M, #0xa002
cmp
jnz param4+#IROM_BASE
call wait_for_cpu_mbox+#IROM_BASE
lr $IX3, @CMBL
jmp mainloop+#IROM_BASE
;dram-length
param4:
lri $AC0.M, #0xb002
cmp
jnz param5+#IROM_BASE
call wait_for_cpu_mbox+#IROM_BASE
lr $AX0.L, @CMBL
jmp mainloop+#IROM_BASE
;iram-start-addr
param5:
lri $AC0.M, #0xd001
cmp
jnz mainloop+#IROM_BASE
call wait_for_cpu_mbox+#IROM_BASE
lr $AR0, @CMBL
jmp 0x80b5
wait_for_dsp_mbox:
lrs $AC0.M, @DMBH
andcf $AC0.M, #0x8000
jlz wait_for_dsp_mbox+#IROM_BASE
ret
wait_for_cpu_mbox:
lrs $AC0.M, @CMBH
andcf $AC0.M, #0x8000
jlnz wait_for_cpu_mbox+#IROM_BASE
ret
wait_dma:
lrs $AC0.M, @DSCR
andcf $AC0.M, #0x0004
jlz wait_dma+#IROM_BASE
ret
bootucode:
nop
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sub_80b5:
set16
clr $ACC1
clr $ACC0
lris $AC0.M, #0x2
sr @DSCR, $AC0.M
sr @DSMAH, $IX0
sr @DSMAL, $IX1
sr @DSPA, $IX2
sr @DSBL, $IX3
call wait_dma+#IROM_BASE
jmpr $AR0
nop
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; 80e7
; Args:
; AR0 points to the 32 input 1 samples (s16)
; AR1 points to the volume data (init1, delta1, init2, delta2)
; AR2 points to the already mixed samples for output 1 (s32)
; AR3 points to where the output 1 should be stored (s32)
; IX0 points to the 32 input 2 samples (s16)
; IX1 points to where the output 2 should be stored (s32)
;
; Returns:
; AX0.L is the value of the last sample from input 1
; AX1.H is the value of the last sample from input 2
mix_two_add:
call mix_add+#IROM_BASE
iar $AR1
mrr $AR0, $IX0
mrr $AR2, $IX1
mrr $AR3, $IX1
mrr $IX0, $AX0.L
call mix_add+#IROM_BASE
mrr $AX1.H, $AX0.L
mrr $AX0.L, $IX0
ret
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; 81f9
; Args:
; AR0 points to the 32 input samples (s16)
; AR1 points to the volume data (init, delta)
; AR2 points to the already mixed samples (s32)
; AR3 points to where the output should be stored (s32)
;
; Returns:
; AX0.L is the value of the last sample
; AX1.H is the first address after the output
mix_add:
lrri $AX1.L, @$AR1
bloopi #32, ____mix_add_end_loop+#IROM_BASE
lrri $AC0.M, @$AR2
lrri $AC0.L, @$AR2
lsl16 $ACC0
lrri $AX0.H, @$AR0
mulx $AX0.H, $AX1.L
addp $ACC0
asr16 $ACC0
srri @$AR3, $AC0.M
____mix_add_end_loop:
srri @$AR3, $AC0.L
movp $ACC0
mrr $AX0.L, $AC0.M
mrr $AX1.H, $AR3
ret
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; 8282
mix_two_add_ramp:
call mix_add_ramp+#IROM_BASE
mrr $AR0, $IX0
mrr $AR2, $IX1
mrr $IX1, $AX0.L
call mix_add_ramp+#IROM_BASE
mrr $AX1.H, $AX0.L
mrr $AX0.L, $IX1
ret
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; 845d
mix_add_ramp:
clr $ACC0
clr $ACC1
lrri $AC0.L, @$AR1
lrrd $AC1.L, @$AR1
mrr $IX2, $AR3
bloopi #32, ____mix_add_ramp_end_ramp+#IROM_BASE
srri @$AR3, $AC0.L
____mix_add_ramp_end_ramp:
add $ACC0, $ACC1
srri @$AR1, $AC0.L
iar $AR1
mrr $IX3, $AR1
mrr $AR1, $IX2
mrr $AR3, $AR2
bloopi #32, ____mix_add_ramp_end_loop+#IROM_BASE
lrri $AC0.M, @$AR2
lrri $AC0.L, @$AR2
lsl16 $ACC0
lrri $AX0.H, @$AR0
lrri $AX1.L, @$AR1
mulx $AX0.H, $AX1.L
addp $ACC0
asr16 $ACC0
srri @$AR3, $AC0.M
____mix_add_ramp_end_loop:
srri @$AR3, $AC0.L
movp $ACC0
mrr $AX0.L, $AC0.M
mrr $AX1.H, $AR3
mrr $AR1, $IX3
mrr $AR3, $IX2
ret
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