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macros.inc
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.macro M8
sep #20
.endm
.macro X8
sep #10
.endm
.macro M16
rep #20
.endm
.macro X16
rep #10
.endm
.macro MX8
sep #30
.endm
.macro MX16
rep #30
.endm
; multiply by 8
.macro ASL3
asl
asl
asl
.endm
; multiply by 16
.macro ASL4
asl
asl
asl
asl
.endm
; multiply by 32
.macro ASL5
asl
asl
asl
asl
asl
.endm
; divide by 8
.macro LSR3
lsr
lsr
lsr
.endm
; divide by 16
.macro LSR4
lsr
lsr
lsr
lsr
.endm
.macro CLEAR_VRAM_DMA dest_addr, nb_bytes
ldx #%dest_addr
stx VMADDL
lda #18 ; VMDATAL 21*18*
sta BBAD0
ldx #@null_byte
stx A1T0L
lda #^null_byte
sta A1T0B
ldx #%nb_bytes
stx DAS0L
; 765 43 210
; 000 01 001
lda #09
sta DMAP0
lda #01
sta MDMAEN
.endm
.macro VRAM_DMA_TRANSFER dest_addr, src_addr, nb_bytes
ldx #%dest_addr
stx VMADDL
lda #18 ; VMDATAL 21*18*
sta BBAD0
ldx #@%src_addr
stx A1T0L
lda #^%src_addr
sta A1T0B
ldx #%nb_bytes
stx DAS0L
lda #01
sta DMAP0
lda #01
sta MDMAEN
.endm
.macro VRAM_DMA_TRANSFER_TEST dest_addr, src_addr, nb_bytes, vmdata
ldx #%dest_addr
stx VMADDL
lda #%vmdata
sta BBAD0
ldx #@%src_addr
stx A1T0L
lda #^%src_addr
sta A1T0B
ldx #%nb_bytes
stx DAS0L
lda #00
sta DMAP0
lda #01
sta MDMAEN
.endm
.macro VRAM_DMA_TRANSFER_TEST2 dest_addr, src_addr, nb_bytes, vmdata
ldx @%dest_addr
stx VMADDL
lda #%vmdata
sta BBAD0
ldx #@%src_addr
stx A1T0L
lda #^%src_addr
sta A1T0B
ldx #%nb_bytes
stx DAS0L
lda #00
sta DMAP0
lda #01
sta MDMAEN
.endm
.macro CGRAM_DMA_TRANSFER dest_addr, src_addr, nb_bytes
lda #%dest_addr
sta CGADD
lda #22 ; CGDATA 21*22*
sta BBAD0
ldx #@%src_addr
stx A1T0L
lda #^%src_addr
sta A1T0B
rep #20
lda #%nb_bytes
sta DAS0L
sep #20
lda #00
sta DMAP0
lda #01
sta MDMAEN
.endm
.macro WRAM_DMA_TRANSFER upper, dest_addr, src_addr, nb_bytes
ldx #%dest_addr
stx WMADDL
lda #%upper
sta WMADDH
lda #80 ; WMDATA 21*80*
sta BBAD0
ldx #@%src_addr
stx A1T0L
lda #^%src_addr
sta A1T0B
ldx #%nb_bytes
stx DAS0L
lda #00
sta DMAP0
lda #01
sta MDMAEN
.endm
.macro RESET_OFFSET bghofs, bgvofs
lda #00 ; first write = lower byte
sta %bghofs ; horizontal scroll ;
sta %bghofs ; second write = upper 2 bits
lda #ff ; vertical scroll. caution, offset by -1
sta %bgvofs
lda #00
sta %bgvofs
.endm
.macro RESERVE_STACK_FRAME size
phd
tsc
sec
sbc #%size
tcs
tcd
.endm
.macro RESTORE_STACK_FRAME size
tsc
clc
adc #%size
tcs
pld
.endm
.macro MULTIPLY
lda @multiplicand
sta WRMPYA ; Multiplicand
lda @multiplier
sta WRMPYB ; Multiplier
nop ; wait 8 cycles
nop
nop
nop
; lda RDMPYL ; Mul Product, lower byte
; lda RDMPYH ; Mul Product, higher byte
.endm
.macro WAIT8
nop ; wait 8 cycles
nop
nop
nop
.endm
.macro ASR8
cmp #80
ror
.endm
.macro ASR16
cmp #8000
ror
.endm