mirror of
https://github.com/irmen/prog8.git
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1103 lines
22 KiB
Lua
1103 lines
22 KiB
Lua
; Prog8 definitions for the Commodore-64
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; These are the utility subroutines.
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;
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; Written by Irmen de Jong (irmen@razorvine.net) - license: GNU GPL 3.0
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;
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; indent format: TABS, size=8
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%import c64lib
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~ c64utils {
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const uword ESTACK_LO = $ce00
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const uword ESTACK_HI = $cf00
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; ----- utility functions ----
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asmsub ubyte2decimal (ubyte value @ A) -> clobbers() -> (ubyte @ Y, ubyte @ X, ubyte @ A) {
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; ---- A to decimal string in Y/X/A (100s in Y, 10s in X, 1s in A)
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%asm {{
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ldy #$2f
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ldx #$3a
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sec
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- iny
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sbc #100
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bcs -
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- dex
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adc #10
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bmi -
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adc #$2f
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rts
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}}
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}
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asmsub byte2decimal (ubyte value @ A) -> clobbers() -> (ubyte @ Y, ubyte @ X, ubyte @ A) {
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; ---- A (signed byte) to decimal string in Y/X/A (100s in Y, 10s in X, 1s in A)
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; note: the '-' is not part of the conversion here if it's a negative number
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%asm {{
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cmp #0
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bpl +
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eor #255
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clc
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adc #1
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+ jmp ubyte2decimal
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}}
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}
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asmsub ubyte2hex (ubyte value @ A) -> clobbers() -> (ubyte @ A, ubyte @ Y) {
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; ---- A to hex string in AY (first hex char in A, second hex char in Y)
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%asm {{
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stx c64.SCRATCH_ZPREGX
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pha
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and #$0f
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tax
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ldy _hex_digits,x
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pla
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lsr a
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lsr a
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lsr a
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lsr a
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tax
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lda _hex_digits,x
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ldx c64.SCRATCH_ZPREGX
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rts
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_hex_digits .text "0123456789abcdef" ; can probably be reused for other stuff as well
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}}
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}
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asmsub uword2hex (uword value @ AY) -> clobbers(A,Y) -> () {
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; ---- convert 16 bit uword in A/Y into 4-character hexadecimal string 'uword2hex.output' (0-terminated)
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%asm {{
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sta c64.SCRATCH_ZPREG
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tya
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jsr ubyte2hex
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sta output
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sty output+1
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lda c64.SCRATCH_ZPREG
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jsr ubyte2hex
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sta output+2
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sty output+3
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rts
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output .text "0000", $00 ; 0-terminated output buffer (to make printing easier)
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}}
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}
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asmsub uword2bcd (uword value @ AY) -> clobbers(A,Y) -> () {
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; Convert an 16 bit binary value to BCD
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;
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; This function converts a 16 bit binary value in A/Y into a 24 bit BCD. It
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; works by transferring one bit a time from the source and adding it
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; into a BCD value that is being doubled on each iteration. As all the
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; arithmetic is being done in BCD the result is a binary to decimal
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; conversion.
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%asm {{
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sta c64.SCRATCH_ZPB1
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sty c64.SCRATCH_ZPREG
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php
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pla ; read status register
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and #%00000100
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sta _had_irqd
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sei ; disable interrupts because of bcd math
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sed ; switch to decimal mode
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lda #0 ; ensure the result is clear
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sta bcdbuff+0
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sta bcdbuff+1
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sta bcdbuff+2
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ldy #16 ; the number of source bits
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- asl c64.SCRATCH_ZPB1 ; shift out one bit
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rol c64.SCRATCH_ZPREG
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lda bcdbuff+0 ; and add into result
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adc bcdbuff+0
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sta bcdbuff+0
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lda bcdbuff+1 ; propagating any carry
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adc bcdbuff+1
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sta bcdbuff+1
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lda bcdbuff+2 ; ... thru whole result
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adc bcdbuff+2
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sta bcdbuff+2
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dey ; and repeat for next bit
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bne -
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cld ; back to binary
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lda _had_irqd
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bne +
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cli ; enable interrupts again (only if they were enabled before)
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+ rts
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_had_irqd .byte 0
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bcdbuff .byte 0,0,0
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}}
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}
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asmsub uword2decimal (uword value @ AY) -> clobbers(A) -> (ubyte @ Y) {
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; ---- convert 16 bit uword in A/Y into 0-terminated decimal string into memory 'uword2decimal.output'
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; returns length of resulting string in Y
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%asm {{
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jsr uword2bcd
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lda uword2bcd.bcdbuff+2
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clc
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adc #'0'
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sta output
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ldy #1
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lda uword2bcd.bcdbuff+1
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jsr +
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lda uword2bcd.bcdbuff+0
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+ pha
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lsr a
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lsr a
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lsr a
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lsr a
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clc
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adc #'0'
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sta output,y
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iny
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pla
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and #$0f
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adc #'0'
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sta output,y
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iny
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lda #0
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sta output,y
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rts
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output .text "00000", $00 ; 0 terminated
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}}
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}
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asmsub str2uword(str string @ AY) -> clobbers() -> (uword @ AY) {
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; -- returns the unsigned word value of the string number argument in AY
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; the number may NOT be preceded by a + sign and may NOT contain spaces
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; (any non-digit character will terminate the number string that is parsed)
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%asm {{
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_result = c64.SCRATCH_ZPWORD2
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sta _mod+1
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sty _mod+2
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ldy #0
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sty _result
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sty _result+1
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_mod lda $ffff,y ; modified
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sec
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sbc #48
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bpl +
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_done ; return result
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lda _result
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ldy _result+1
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rts
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+ cmp #10
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bcs _done
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; add digit to result
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pha
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jsr _result_times_10
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pla
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clc
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adc _result
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sta _result
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bcc +
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inc _result+1
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+ iny
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bne _mod
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; never reached
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_result_times_10 ; (W*4 + W)*2
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lda _result+1
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sta c64.SCRATCH_ZPREG
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lda _result
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asl a
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rol c64.SCRATCH_ZPREG
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asl a
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rol c64.SCRATCH_ZPREG
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clc
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adc _result
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sta _result
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lda c64.SCRATCH_ZPREG
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adc _result+1
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asl _result
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rol a
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sta _result+1
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rts
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}}
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}
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asmsub str2word(str string @ AY) -> clobbers() -> (word @ AY) {
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; -- returns the signed word value of the string number argument in AY
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; the number may be preceded by a + or - sign but may NOT contain spaces
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; (any non-digit character will terminate the number string that is parsed)
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%asm {{
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_result = c64.SCRATCH_ZPWORD2
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sta c64.SCRATCH_ZPWORD1
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sty c64.SCRATCH_ZPWORD1+1
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ldy #0
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sty _result
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sty _result+1
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sty _negative
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lda (c64.SCRATCH_ZPWORD1),y
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cmp #'+'
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bne +
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iny
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+ cmp #'-'
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bne _parse
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inc _negative
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iny
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_parse lda (c64.SCRATCH_ZPWORD1),y
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sec
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sbc #48
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bpl _digit
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_done ; return result
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lda _negative
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beq +
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sec
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lda #0
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sbc _result
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sta _result
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lda #0
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sbc _result+1
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sta _result+1
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+ lda _result
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ldy _result+1
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rts
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_digit cmp #10
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bcs _done
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; add digit to result
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pha
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jsr str2uword._result_times_10
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pla
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clc
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adc _result
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sta _result
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bcc +
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inc _result+1
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+ iny
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bne _parse
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; never reached
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_negative .byte 0
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}}
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}
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asmsub set_irqvec_excl() -> clobbers(A) -> () {
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%asm {{
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sei
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lda #<_irq_handler
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sta c64.CINV
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lda #>_irq_handler
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sta c64.CINV+1
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cli
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rts
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_irq_handler jsr set_irqvec._irq_handler_init
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jsr irq.irq
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jsr set_irqvec._irq_handler_end
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lda #$ff
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sta c64.VICIRQ ; acknowledge raster irq
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lda c64.CIA1ICR ; acknowledge CIA1 interrupt
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jmp c64.IRQDFEND ; end irq processing - don't call kernel
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}}
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}
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asmsub set_irqvec() -> clobbers(A) -> () {
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%asm {{
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sei
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lda #<_irq_handler
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sta c64.CINV
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lda #>_irq_handler
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sta c64.CINV+1
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cli
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rts
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_irq_handler jsr _irq_handler_init
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jsr irq.irq
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jsr _irq_handler_end
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jmp c64.IRQDFRT ; continue with normal kernel irq routine
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_irq_handler_init
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; save all zp scratch registers and the X register as these might be clobbered by the irq routine
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stx IRQ_X_REG
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lda c64.SCRATCH_ZPB1
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sta IRQ_SCRATCH_ZPB1
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lda c64.SCRATCH_ZPREG
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sta IRQ_SCRATCH_ZPREG
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lda c64.SCRATCH_ZPREGX
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sta IRQ_SCRATCH_ZPREGX
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lda c64.SCRATCH_ZPWORD1
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sta IRQ_SCRATCH_ZPWORD1
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lda c64.SCRATCH_ZPWORD1+1
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sta IRQ_SCRATCH_ZPWORD1+1
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lda c64.SCRATCH_ZPWORD2
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sta IRQ_SCRATCH_ZPWORD2
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lda c64.SCRATCH_ZPWORD2+1
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sta IRQ_SCRATCH_ZPWORD2+1
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; stack protector; make sure we don't clobber the top of the evaluation stack
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dex
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dex
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dex
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dex
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dex
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dex
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rts
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_irq_handler_end
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; restore all zp scratch registers and the X register
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lda IRQ_SCRATCH_ZPB1
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sta c64.SCRATCH_ZPB1
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lda IRQ_SCRATCH_ZPREG
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sta c64.SCRATCH_ZPREG
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lda IRQ_SCRATCH_ZPREGX
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sta c64.SCRATCH_ZPREGX
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lda IRQ_SCRATCH_ZPWORD1
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sta c64.SCRATCH_ZPWORD1
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lda IRQ_SCRATCH_ZPWORD1+1
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sta c64.SCRATCH_ZPWORD1+1
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lda IRQ_SCRATCH_ZPWORD2
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sta c64.SCRATCH_ZPWORD2
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lda IRQ_SCRATCH_ZPWORD2+1
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sta c64.SCRATCH_ZPWORD2+1
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ldx IRQ_X_REG
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rts
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IRQ_X_REG .byte 0
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IRQ_SCRATCH_ZPB1 .byte 0
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IRQ_SCRATCH_ZPREG .byte 0
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IRQ_SCRATCH_ZPREGX .byte 0
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IRQ_SCRATCH_ZPWORD1 .word 0
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IRQ_SCRATCH_ZPWORD2 .word 0
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}}
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}
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asmsub restore_irqvec() -> clobbers() -> () {
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%asm {{
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sei
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lda #<c64.IRQDFRT
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sta c64.CINV
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lda #>c64.IRQDFRT
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sta c64.CINV+1
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lda #0
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sta c64.IREQMASK ; disable raster irq
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lda #%10000001
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sta c64.CIA1ICR ; restore CIA1 irq
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cli
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rts
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}}
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}
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asmsub set_rasterirq(uword rasterpos @ AY) -> clobbers(A) -> () {
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%asm {{
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sei
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jsr _setup_raster_irq
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lda #<_raster_irq_handler
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sta c64.CINV
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lda #>_raster_irq_handler
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sta c64.CINV+1
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cli
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rts
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_raster_irq_handler
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jsr set_irqvec._irq_handler_init
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jsr irq.irq
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jsr set_irqvec._irq_handler_end
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lda #$ff
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sta c64.VICIRQ ; acknowledge raster irq
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jmp c64.IRQDFRT
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_setup_raster_irq
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pha
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lda #%01111111
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sta c64.CIA1ICR ; "switch off" interrupts signals from cia-1
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sta c64.CIA2ICR ; "switch off" interrupts signals from cia-2
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and c64.SCROLY
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sta c64.SCROLY ; clear most significant bit of raster position
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lda c64.CIA1ICR ; ack previous irq
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lda c64.CIA2ICR ; ack previous irq
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pla
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sta c64.RASTER ; set the raster line number where interrupt should occur
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cpy #0
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beq +
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lda c64.SCROLY
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ora #%10000000
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sta c64.SCROLY ; set most significant bit of raster position
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+ lda #%00000001
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sta c64.IREQMASK ;enable raster interrupt signals from vic
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rts
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}}
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}
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asmsub set_rasterirq_excl(uword rasterpos @ AY) -> clobbers(A) -> () {
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%asm {{
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sei
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jsr set_rasterirq._setup_raster_irq
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lda #<_raster_irq_handler
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sta c64.CINV
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lda #>_raster_irq_handler
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sta c64.CINV+1
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cli
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rts
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_raster_irq_handler
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jsr set_irqvec._irq_handler_init
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jsr irq.irq
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jsr set_irqvec._irq_handler_end
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lda #$ff
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sta c64.VICIRQ ; acknowledge raster irq
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jmp c64.IRQDFEND ; end irq processing - don't call kernel
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}}
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}
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} ; ------ end of block c64utils
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~ c64scr {
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; ---- this block contains (character) Screen and text I/O related functions ----
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asmsub clear_screen (ubyte char @ A, ubyte color @ Y) -> clobbers(A) -> () {
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; ---- clear the character screen with the given fill character and character color.
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; (assumes screen and color matrix are at their default addresses)
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%asm {{
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pha
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tya
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jsr clear_screencolors
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pla
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jsr clear_screenchars
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rts
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}}
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}
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asmsub clear_screenchars (ubyte char @ A) -> clobbers(Y) -> () {
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; ---- clear the character screen with the given fill character (leaves colors)
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; (assumes screen matrix is at the default address)
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%asm {{
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ldy #0
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_loop sta c64.Screen,y
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sta c64.Screen+1,y
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sta c64.Screen+$0100,y
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sta c64.Screen+$0101,y
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sta c64.Screen+$0200,y
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sta c64.Screen+$0201,y
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sta c64.Screen+$02e8,y
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sta c64.Screen+$02e9,y
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iny
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iny
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bne _loop
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rts
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}}
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}
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asmsub clear_screencolors (ubyte color @ A) -> clobbers(Y) -> () {
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; ---- clear the character screen colors with the given color (leaves characters).
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; (assumes color matrix is at the default address)
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%asm {{
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ldy #0
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_loop sta c64.Colors,y
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sta c64.Colors+1,y
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sta c64.Colors+$0100,y
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sta c64.Colors+$0101,y
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sta c64.Colors+$0200,y
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sta c64.Colors+$0201,y
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sta c64.Colors+$02e8,y
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sta c64.Colors+$02e9,y
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iny
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iny
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bne _loop
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rts
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}}
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}
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asmsub scroll_left_full (ubyte alsocolors @ Pc) -> clobbers(A, Y) -> () {
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; ---- scroll the whole screen 1 character to the left
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; contents of the rightmost column are unchanged, you should clear/refill this yourself
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; Carry flag determines if screen color data must be scrolled too
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%asm {{
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stx c64.SCRATCH_ZPREGX
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bcs +
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jmp _scroll_screen
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+ ; scroll the color memory
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ldx #0
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ldy #38
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-
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.for row=0, row<=12, row+=1
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lda c64.Colors + 40*row + 1,x
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sta c64.Colors + 40*row,x
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.next
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inx
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dey
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bpl -
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ldx #0
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ldy #38
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-
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.for row=13, row<=24, row+=1
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lda c64.Colors + 40*row + 1,x
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sta c64.Colors + 40*row,x
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.next
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inx
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dey
|
|
bpl -
|
|
|
|
_scroll_screen ; scroll the screen memory
|
|
ldx #0
|
|
ldy #38
|
|
-
|
|
.for row=0, row<=12, row+=1
|
|
lda c64.Screen + 40*row + 1,x
|
|
sta c64.Screen + 40*row,x
|
|
.next
|
|
inx
|
|
dey
|
|
bpl -
|
|
|
|
ldx #0
|
|
ldy #38
|
|
-
|
|
.for row=13, row<=24, row+=1
|
|
lda c64.Screen + 40*row + 1,x
|
|
sta c64.Screen + 40*row,x
|
|
.next
|
|
inx
|
|
dey
|
|
bpl -
|
|
|
|
ldx c64.SCRATCH_ZPREGX
|
|
rts
|
|
}}
|
|
}
|
|
|
|
|
|
asmsub scroll_right_full (ubyte alsocolors @ Pc) -> clobbers(A) -> () {
|
|
; ---- scroll the whole screen 1 character to the right
|
|
; contents of the leftmost column are unchanged, you should clear/refill this yourself
|
|
; Carry flag determines if screen color data must be scrolled too
|
|
%asm {{
|
|
stx c64.SCRATCH_ZPREGX
|
|
bcs +
|
|
jmp _scroll_screen
|
|
|
|
+ ; scroll the color memory
|
|
ldx #38
|
|
-
|
|
.for row=0, row<=12, row+=1
|
|
lda c64.Colors + 40*row + 0,x
|
|
sta c64.Colors + 40*row + 1,x
|
|
.next
|
|
dex
|
|
bpl -
|
|
|
|
ldx #38
|
|
-
|
|
.for row=13, row<=24, row+=1
|
|
lda c64.Colors + 40*row,x
|
|
sta c64.Colors + 40*row + 1,x
|
|
.next
|
|
dex
|
|
bpl -
|
|
|
|
_scroll_screen ; scroll the screen memory
|
|
ldx #38
|
|
-
|
|
.for row=0, row<=12, row+=1
|
|
lda c64.Screen + 40*row + 0,x
|
|
sta c64.Screen + 40*row + 1,x
|
|
.next
|
|
dex
|
|
bpl -
|
|
|
|
ldx #38
|
|
-
|
|
.for row=13, row<=24, row+=1
|
|
lda c64.Screen + 40*row,x
|
|
sta c64.Screen + 40*row + 1,x
|
|
.next
|
|
dex
|
|
bpl -
|
|
|
|
ldx c64.SCRATCH_ZPREGX
|
|
rts
|
|
}}
|
|
}
|
|
|
|
|
|
asmsub scroll_up_full (ubyte alsocolors @ Pc) -> clobbers(A) -> () {
|
|
; ---- scroll the whole screen 1 character up
|
|
; contents of the bottom row are unchanged, you should refill/clear this yourself
|
|
; Carry flag determines if screen color data must be scrolled too
|
|
%asm {{
|
|
stx c64.SCRATCH_ZPREGX
|
|
bcs +
|
|
jmp _scroll_screen
|
|
|
|
+ ; scroll the color memory
|
|
ldx #39
|
|
-
|
|
.for row=1, row<=11, row+=1
|
|
lda c64.Colors + 40*row,x
|
|
sta c64.Colors + 40*(row-1),x
|
|
.next
|
|
dex
|
|
bpl -
|
|
|
|
ldx #39
|
|
-
|
|
.for row=12, row<=24, row+=1
|
|
lda c64.Colors + 40*row,x
|
|
sta c64.Colors + 40*(row-1),x
|
|
.next
|
|
dex
|
|
bpl -
|
|
|
|
_scroll_screen ; scroll the screen memory
|
|
ldx #39
|
|
-
|
|
.for row=1, row<=11, row+=1
|
|
lda c64.Screen + 40*row,x
|
|
sta c64.Screen + 40*(row-1),x
|
|
.next
|
|
dex
|
|
bpl -
|
|
|
|
ldx #39
|
|
-
|
|
.for row=12, row<=24, row+=1
|
|
lda c64.Screen + 40*row,x
|
|
sta c64.Screen + 40*(row-1),x
|
|
.next
|
|
dex
|
|
bpl -
|
|
|
|
ldx c64.SCRATCH_ZPREGX
|
|
rts
|
|
}}
|
|
}
|
|
|
|
|
|
asmsub scroll_down_full (ubyte alsocolors @ Pc) -> clobbers(A) -> () {
|
|
; ---- scroll the whole screen 1 character down
|
|
; contents of the top row are unchanged, you should refill/clear this yourself
|
|
; Carry flag determines if screen color data must be scrolled too
|
|
%asm {{
|
|
stx c64.SCRATCH_ZPREGX
|
|
bcs +
|
|
jmp _scroll_screen
|
|
|
|
+ ; scroll the color memory
|
|
ldx #39
|
|
-
|
|
.for row=23, row>=12, row-=1
|
|
lda c64.Colors + 40*row,x
|
|
sta c64.Colors + 40*(row+1),x
|
|
.next
|
|
dex
|
|
bpl -
|
|
|
|
ldx #39
|
|
-
|
|
.for row=11, row>=0, row-=1
|
|
lda c64.Colors + 40*row,x
|
|
sta c64.Colors + 40*(row+1),x
|
|
.next
|
|
dex
|
|
bpl -
|
|
|
|
_scroll_screen ; scroll the screen memory
|
|
ldx #39
|
|
-
|
|
.for row=23, row>=12, row-=1
|
|
lda c64.Screen + 40*row,x
|
|
sta c64.Screen + 40*(row+1),x
|
|
.next
|
|
dex
|
|
bpl -
|
|
|
|
ldx #39
|
|
-
|
|
.for row=11, row>=0, row-=1
|
|
lda c64.Screen + 40*row,x
|
|
sta c64.Screen + 40*(row+1),x
|
|
.next
|
|
dex
|
|
bpl -
|
|
|
|
ldx c64.SCRATCH_ZPREGX
|
|
rts
|
|
}}
|
|
}
|
|
|
|
|
|
|
|
asmsub print (str text @ AY) -> clobbers(A,Y) -> () {
|
|
; ---- print null terminated string from A/Y
|
|
; note: the compiler contains an optimization that will replace
|
|
; a call to this subroutine with a string argument of just one char,
|
|
; by just one call to c64.CHROUT of that single char.
|
|
%asm {{
|
|
sta c64.SCRATCH_ZPB1
|
|
sty c64.SCRATCH_ZPREG
|
|
ldy #0
|
|
- lda (c64.SCRATCH_ZPB1),y
|
|
beq +
|
|
jsr c64.CHROUT
|
|
iny
|
|
bne -
|
|
+ rts
|
|
}}
|
|
}
|
|
|
|
|
|
asmsub print_ub0 (ubyte value @ A) -> clobbers(A,Y) -> () {
|
|
; ---- print the ubyte in A in decimal form, with left padding 0s (3 positions total)
|
|
%asm {{
|
|
stx c64.SCRATCH_ZPREGX
|
|
jsr c64utils.ubyte2decimal
|
|
pha
|
|
tya
|
|
jsr c64.CHROUT
|
|
txa
|
|
jsr c64.CHROUT
|
|
pla
|
|
jsr c64.CHROUT
|
|
ldx c64.SCRATCH_ZPREGX
|
|
rts
|
|
}}
|
|
}
|
|
|
|
|
|
asmsub print_ub (ubyte value @ A) -> clobbers(A,Y) -> () {
|
|
; ---- print the ubyte in A in decimal form, without left padding 0s
|
|
%asm {{
|
|
stx c64.SCRATCH_ZPREGX
|
|
jsr c64utils.ubyte2decimal
|
|
_print_byte_digits
|
|
pha
|
|
cpy #'0'
|
|
bne _print_hundreds
|
|
cpx #'0'
|
|
bne _print_tens
|
|
jmp _end
|
|
_print_hundreds tya
|
|
jsr c64.CHROUT
|
|
_print_tens txa
|
|
jsr c64.CHROUT
|
|
_end pla
|
|
jsr c64.CHROUT
|
|
ldx c64.SCRATCH_ZPREGX
|
|
rts
|
|
}}
|
|
}
|
|
|
|
asmsub print_b (byte value @ A) -> clobbers(A,Y) -> () {
|
|
; ---- print the byte in A in decimal form, without left padding 0s
|
|
%asm {{
|
|
stx c64.SCRATCH_ZPREGX
|
|
pha
|
|
cmp #0
|
|
bpl +
|
|
lda #'-'
|
|
jsr c64.CHROUT
|
|
+ pla
|
|
jsr c64utils.byte2decimal
|
|
jsr print_ub._print_byte_digits
|
|
ldx c64.SCRATCH_ZPREGX
|
|
rts
|
|
}}
|
|
}
|
|
|
|
|
|
asmsub print_ubhex (ubyte prefix @ Pc, ubyte value @ A) -> clobbers(A,Y) -> () {
|
|
; ---- print the ubyte in A in hex form (if Carry is set, a radix prefix '$' is printed as well)
|
|
%asm {{
|
|
stx c64.SCRATCH_ZPREGX
|
|
bcc +
|
|
pha
|
|
lda #'$'
|
|
jsr c64.CHROUT
|
|
pla
|
|
+ jsr c64utils.ubyte2hex
|
|
jsr c64.CHROUT
|
|
tya
|
|
jsr c64.CHROUT
|
|
ldx c64.SCRATCH_ZPREGX
|
|
rts
|
|
}}
|
|
}
|
|
|
|
|
|
asmsub print_ubbin (ubyte prefix @ Pc, ubyte value @ A) -> clobbers(A,Y) ->() {
|
|
; ---- print the ubyte in A in binary form (if Carry is set, a radix prefix '%' is printed as well)
|
|
%asm {{
|
|
stx c64.SCRATCH_ZPREGX
|
|
sta c64.SCRATCH_ZPB1
|
|
bcc +
|
|
lda #'%'
|
|
jsr c64.CHROUT
|
|
+ ldy #8
|
|
- lda #'0'
|
|
asl c64.SCRATCH_ZPB1
|
|
bcc +
|
|
lda #'1'
|
|
+ jsr c64.CHROUT
|
|
dey
|
|
bne -
|
|
ldx c64.SCRATCH_ZPREGX
|
|
rts
|
|
}}
|
|
}
|
|
|
|
|
|
asmsub print_uwbin (ubyte prefix @ Pc, uword value @ AY) -> clobbers(A,Y) ->() {
|
|
; ---- print the uword in A/Y in binary form (if Carry is set, a radix prefix '%' is printed as well)
|
|
%asm {{
|
|
pha
|
|
tya
|
|
jsr print_ubbin
|
|
pla
|
|
clc
|
|
jmp print_ubbin
|
|
}}
|
|
}
|
|
|
|
|
|
asmsub print_uwhex (ubyte prefix @ Pc, uword value @ AY) -> clobbers(A,Y) -> () {
|
|
; ---- print the uword in A/Y in hexadecimal form (4 digits)
|
|
; (if Carry is set, a radix prefix '$' is printed as well)
|
|
%asm {{
|
|
pha
|
|
tya
|
|
jsr print_ubhex
|
|
pla
|
|
clc
|
|
jmp print_ubhex
|
|
}}
|
|
}
|
|
|
|
|
|
asmsub print_uw0 (uword value @ AY) -> clobbers(A,Y) -> () {
|
|
; ---- print the uword in A/Y in decimal form, with left padding 0s (5 positions total)
|
|
%asm {{
|
|
jsr c64utils.uword2decimal
|
|
ldy #0
|
|
- lda c64utils.uword2decimal.output,y
|
|
jsr c64.CHROUT
|
|
iny
|
|
cpy #5
|
|
bne -
|
|
rts
|
|
}}
|
|
}
|
|
|
|
|
|
asmsub print_uw (uword value @ AY) -> clobbers(A,Y) -> () {
|
|
; ---- print the uword in A/Y in decimal form, without left padding 0s
|
|
%asm {{
|
|
jsr c64utils.uword2decimal
|
|
ldy #0
|
|
lda c64utils.uword2decimal.output
|
|
cmp #'0'
|
|
bne _pr_decimal
|
|
iny
|
|
lda c64utils.uword2decimal.output+1
|
|
cmp #'0'
|
|
bne _pr_decimal
|
|
iny
|
|
lda c64utils.uword2decimal.output+2
|
|
cmp #'0'
|
|
bne _pr_decimal
|
|
iny
|
|
lda c64utils.uword2decimal.output+3
|
|
cmp #'0'
|
|
bne _pr_decimal
|
|
iny
|
|
|
|
_pr_decimal
|
|
lda c64utils.uword2decimal.output,y
|
|
jsr c64.CHROUT
|
|
iny
|
|
cpy #5
|
|
bcc _pr_decimal
|
|
rts
|
|
}}
|
|
}
|
|
|
|
asmsub print_w (word value @ AY) -> clobbers(A,Y) -> () {
|
|
; ---- print the (signed) word in A/Y in decimal form, without left padding 0's
|
|
%asm {{
|
|
cpy #0
|
|
bpl +
|
|
pha
|
|
lda #'-'
|
|
jsr c64.CHROUT
|
|
tya
|
|
eor #255
|
|
tay
|
|
pla
|
|
eor #255
|
|
clc
|
|
adc #1
|
|
bcc +
|
|
iny
|
|
+ jmp print_uw
|
|
}}
|
|
}
|
|
|
|
asmsub input_chars (uword buffer @ AY) -> clobbers(A) -> (ubyte @ Y) {
|
|
; ---- Input a string (max. 80 chars) from the keyboard. Returns length in Y. (string is terminated with a 0 byte as well)
|
|
; It assumes the keyboard is selected as I/O channel!
|
|
|
|
%asm {{
|
|
sta c64.SCRATCH_ZPWORD1
|
|
sty c64.SCRATCH_ZPWORD1+1
|
|
ldy #0 ; char counter = 0
|
|
- jsr c64.CHRIN
|
|
cmp #$0d ; return (ascii 13) pressed?
|
|
beq + ; yes, end.
|
|
sta (c64.SCRATCH_ZPWORD1),y ; else store char in buffer
|
|
iny
|
|
bne -
|
|
+ lda #0
|
|
sta (c64.SCRATCH_ZPWORD1),y ; finish string with 0 byte
|
|
rts
|
|
|
|
}}
|
|
}
|
|
|
|
asmsub setchr (ubyte col @Y, ubyte row @A) -> clobbers(A) -> () {
|
|
; ---- set the character in SCRATCH_ZPB1 on the screen matrix at the given position
|
|
%asm {{
|
|
sty c64.SCRATCH_ZPREG
|
|
asl a
|
|
tay
|
|
lda _screenrows+1,y
|
|
sta _mod+2
|
|
lda _screenrows,y
|
|
clc
|
|
adc c64.SCRATCH_ZPREG
|
|
sta _mod+1
|
|
bcc +
|
|
inc _mod+2
|
|
+ lda c64.SCRATCH_ZPB1
|
|
_mod sta $ffff ; modified
|
|
rts
|
|
|
|
_screenrows .word $0400 + range(0, 1000, 40)
|
|
}}
|
|
}
|
|
|
|
asmsub getchr (ubyte col @Y, ubyte row @A) -> clobbers(Y) -> (ubyte @ A) {
|
|
; ---- get the character in the screen matrix at the given location
|
|
%asm {{
|
|
sty c64.SCRATCH_ZPB1
|
|
asl a
|
|
tay
|
|
lda setchr._screenrows+1,y
|
|
sta _mod+2
|
|
lda setchr._screenrows,y
|
|
clc
|
|
adc c64.SCRATCH_ZPB1
|
|
sta _mod+1
|
|
bcc _mod
|
|
inc _mod+2
|
|
_mod lda $ffff ; modified
|
|
rts
|
|
}}
|
|
}
|
|
|
|
asmsub setclr (ubyte col @Y, ubyte row @A) -> clobbers(A) -> () {
|
|
; ---- set the color in SCRATCH_ZPB1 on the screen matrix at the given position
|
|
%asm {{
|
|
sty c64.SCRATCH_ZPREG
|
|
asl a
|
|
tay
|
|
lda _colorrows+1,y
|
|
sta _mod+2
|
|
lda _colorrows,y
|
|
clc
|
|
adc c64.SCRATCH_ZPREG
|
|
sta _mod+1
|
|
bcc +
|
|
inc _mod+2
|
|
+ lda c64.SCRATCH_ZPB1
|
|
_mod sta $ffff ; modified
|
|
rts
|
|
|
|
_colorrows .word $d800 + range(0, 1000, 40)
|
|
}}
|
|
}
|
|
|
|
asmsub getclr (ubyte col @Y, ubyte row @A) -> clobbers(Y) -> (ubyte @ A) {
|
|
; ---- get the color in the screen color matrix at the given location
|
|
%asm {{
|
|
sty c64.SCRATCH_ZPB1
|
|
asl a
|
|
tay
|
|
lda setclr._colorrows+1,y
|
|
sta _mod+2
|
|
lda setclr._colorrows,y
|
|
clc
|
|
adc c64.SCRATCH_ZPB1
|
|
sta _mod+1
|
|
bcc _mod
|
|
inc _mod+2
|
|
_mod lda $ffff ; modified
|
|
rts
|
|
}}
|
|
}
|
|
|
|
sub setcc (ubyte column, ubyte row, ubyte char, ubyte color) {
|
|
; ---- set char+color at the given position on the screen
|
|
%asm {{
|
|
lda setcc_row
|
|
asl a
|
|
tay
|
|
lda setchr._screenrows+1,y
|
|
sta _charmod+2
|
|
adc #$d4
|
|
sta _colormod+2
|
|
lda setchr._screenrows,y
|
|
clc
|
|
adc setcc_column
|
|
sta _charmod+1
|
|
sta _colormod+1
|
|
bcc +
|
|
inc _charmod+2
|
|
inc _colormod+2
|
|
+ lda setcc_char
|
|
_charmod sta $ffff ; modified
|
|
lda setcc_color
|
|
_colormod sta $ffff ; modified
|
|
rts
|
|
}}
|
|
}
|
|
|
|
asmsub plot (ubyte col @ Y, ubyte row @ A) -> clobbers(A) -> () {
|
|
; ---- safe wrapper around PLOT kernel routine, to save the X register.
|
|
%asm {{
|
|
stx c64.SCRATCH_ZPREGX
|
|
tax
|
|
clc
|
|
jsr c64.PLOT
|
|
ldx c64.SCRATCH_ZPREGX
|
|
rts
|
|
}}
|
|
}
|
|
|
|
|
|
} ; ---- end block c64scr
|