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Strings.asm
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Strings.asm
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;------------------------------------------------------------------------
;- Written by: Neviksti
;- If you use my code, please share your creations with me
;- as I am always curious :)
;-
;- Note: These routines were originally from examples released
;- by Grog. I fixed up some stuff to make his code work on the
;- real SNES and then added a bunch of features.
;------------------------------------------------------------------------
;String Functions RAM locations
;I arbitrarily close $0010, but move it if you like
.DEFINE Cursor $10 ;Holds 16-bit position on screen
;text buffer - is copied to VRAM during VBlank
; $7F0000 - $7F03FF
.DEFINE TextBuffer $7F0000
; SetCursorPos y, x
.MACRO SetCursorPos
ldx #32*\1 + \2
stx Cursor
.ENDM
.MACRO PrintString
LDX #STRlabel\@
JSR PrintF
BRA END_STRlabel\@
STRlabel\@:
.DB \1, 0
END_STRlabel\@:
.ENDM
;here's a macro for printing a number (a byte)
;
; ex: PrintNum $2103 ;print value of reg $2103
; PrintNum #9 ;print 9
.MACRO PrintNum
lda \1
jsr PrintInt8_noload
.ENDM
.MACRO PrintHexNum
lda \1
jsr PrintHex8_noload
.ENDM
.BANK 0 SLOT 0
.SECTION "Print_Handler"
;Print -- Print an ASCII character to the BG3 buffer
; which needs to be copied into VRAM in the NMI handler.
; Of course, an 8x8 ASCII tile set must
; be loaded and the VRAM pointer set ahead of time
;In: A -- ASCII code to print
;Out: none
;Modifies: P
Print:
PHX
;expectations: A/Mem=8bit, X/Y=16bit
LDX Cursor
STA TextBuffer, X ;Output character
INX
STX Cursor
PLX
RTS
;PrintF -- Print a Formatted, NULL terminated string to Stdout
;In: X -- points to format string
; Y -- points to parameter buffer
;Out: none
;Modifies: none
;Notes:
; Supported Format characters:
; %s -- sub-string (reads 16-bit pointer from Y data)
; %d -- 16-bit Integer (reads 16-bit data from Y data)
; %b -- 8-bit Integer (reads 8-bit data from Y data)
; %x -- 8-bit hex Integer (reads 8-bit data from Y data)
; %% -- normal %
; \n -- Newline
; \t -- Tab
; \b -- Page break
; \\ -- normal slash
; String pointers all refer to current Data Bank (DB)
PrintF: ;Assumes 8b mem, 16b index
PHP
PHA
PHX
PHY
rep #$10 ; A/mem=8bit, X/Y=16bit
sep #$20
PrintFLoop:
LDA $0000,X ;Read next format string character
BEQ PrintFDone ;Check for NULL terminator
INX ;Increment input pointer
CMP #'%'
BEQ PrintFFormat ;Handle Format character
CMP #'\'
BEQ PrintFControl ;Handle Control character
NormalPrint:
JSR Print ;Print the character normally
BRA PrintFLoop
PrintFDone:
PLY
PLX
PLA
PLP
RTS
PrintFControl:
LDA $0000,X ;Read control character
BEQ PrintFDone ;Check for NULL terminator
INX ;Increment input pointer
CMP #'n'
_cn: BNE _ct
rep #$30 ;16b mem, 16b X
LDA Cursor ;Get Current position
CLC
ADC #$0020 ;move to the next line
AND #$FFE0
STA Cursor ;Save new position
sep #$20 ;8b mem, 16b X
BRA PrintFLoop
_ct: CMP #'t'
BNE _cb
rep #$30 ;16b mem, 16b X
LDA Cursor ;Get Current position
CLC
ADC #$0008 ;move to the next tab
AND #$FFF8
STA Cursor ;Save new position
sep #$20 ;8b mem, 16b X
BRA PrintFLoop
_cb: CMP #'b'
BNE _defaultC
STZ Cursor ;Page break
STZ Cursor+1
BRA NormalPrint
_defaultC:
LDA #'\' ;Normal \
BRA NormalPrint
PrintFFormat:
LDA $0000,X ;Read format character
BEQ PrintFDone ;Check for NULL terminator
INX ;Increment input pointer
_sf: CMP #'s'
BNE _df
PHX ;Preserve current format string pointer
LDX 0,Y ;Load sub-string pointer
INY
INY
JSR PrintF ;Call PrintF recursively with sub-string
PLX
BRA PrintFLoop
_df: CMP #'d'
BNE _bf
JSR PrintInt16 ;Print 16-bit Integer
BRA PrintFLoop
_bf: CMP #'b'
BNE _xf
JSR PrintInt8 ;Print 8-bit Integer
BRA PrintFLoop
_xf: CMP #'x'
BNE _defaultF
JSR PrintHex8 ;Print 8-bit Hex Integer
JMP PrintFLoop
_defaultF:
LDA #'%'
BRA NormalPrint
;PrintInt16 -- Read a 16-bit value pointed to by Y and print it to stdout
;In: Y -- Points to integer in current data bank
;Out: Y=Y+2
;Modifies: P
;Notes: Uses Print to output ASCII to stdout
PrintInt16: ;Assume 8b mem, 16b index
LDA #$00
PHA ;Push $00
LDA $0000,Y
STA $4204 ;DIVC.l
LDA $0001,Y
STA $4205 ;DIVC.h ... DIVC = [Y]
INY
INY
DivLoop:
LDA #$0A
STA $4206 ;DIVB = 10 --- division starts here (need to wait 16 cycles)
NOP ; 2 cycles
NOP ; 2 cycles
NOP ; 2 cycles
PHA ; 3 cycles
PLA ; 4 cycles
LDA #'0' ; 2 cycles
CLC ; 2 cycles
ADC $4216 ; A = '0' + DIVC % DIVB
PHA ;Push character
LDA $4214 ; Result.l -> DIVC.l
STA $4204
BEQ _Low_0
LDA $4215 ; Result.h -> DIVC.h
STA $4205
BRA DivLoop
_Low_0:
LDA $4215 ; Result.h -> DIVC.h
STA $4205
BEQ IntPrintLoop ; if ((Result.l==$00) and (Result.h==$00)) then we're done, so print
BRA DivLoop
IntPrintLoop: ;until we get to the end of the string...
PLA ;keep pulling characters and printing them
BEQ _EndOfInt
JSR Print
BRA IntPrintLoop
_EndOfInt:
RTS
;PrintInt8 -- Read an 8-bit value pointed to by Y and print it to stdout
;In: Y -- Points to integer in current data bank
;Out: Y=Y+1
;Modifies: P
;Notes: Uses Print to output ASCII to stdout
PrintInt8: ;Assume 8b mem, 16b index
LDA $0000,Y
INY
PrintInt8_noload:
STA $4204
LDA #$00
STA $4205
PHA
BRA DivLoop
PrintInt16_noload: ;Assume 8b mem, 16b index
LDA #$00
PHA ;Push $00
STX $4204 ;DIVC = X
JSR DivLoop
;PrintHex8 -- Read an 8-bit value pointed to by Y and print it in hex to stdout
;In: Y -- Points to integer in current data bank
;Out: Y=Y+1
;Modifies: P
;Notes: Uses Print to output ASCII to stdout
PrintHex8: ;Assume 8b mem, 16b index
lda $0000,Y
iny
PrintHex8_noload:
pha
lsr A
lsr A
lsr A
lsr A
jsr PrintHexNibble
pla
and #$0F
jsr PrintHexNibble
rts
PrintHexNibble: ;Assume 8b mem, 16b index
cmp #$0A
bcs _nletter
clc
adc #'0'
jsr Print
rts
_nletter:
clc
adc #'A'-10
jsr Print
rts
.ENDS