mirror of
https://github.com/cc65/cc65.git
synced 2024-12-23 04:30:10 +00:00
144 lines
2.9 KiB
ArmAsm
144 lines
2.9 KiB
ArmAsm
;
|
|
; Ullrich von Bassewitz, 13.09.2001
|
|
;
|
|
; Keyboard polling stuff for the 510.
|
|
;
|
|
|
|
.export scnkey
|
|
.importzp tpi2, ktab1, ktab2, ktab3, ktab4
|
|
.importzp keyidx, keybuf, keyscanbuf, keysave, modkey, norkey
|
|
.importzp graphmode, lastidx, rptdelay, rptcount
|
|
|
|
.include "cbm510.inc"
|
|
|
|
|
|
.proc scnkey
|
|
|
|
lda #$FF
|
|
sta modkey
|
|
sta norkey
|
|
lda #$00
|
|
sta keyscanbuf
|
|
ldy #TPI::PRB
|
|
sta (tpi2),y
|
|
ldy #TPI::PRA
|
|
sta (tpi2),y
|
|
jsr Poll
|
|
and #$3F
|
|
eor #$3F
|
|
bne L1
|
|
jmp NoKey
|
|
|
|
L1: lda #$FF
|
|
ldy #TPI::PRA
|
|
sta (tpi2),y
|
|
asl a
|
|
ldy #TPI::PRB
|
|
sta (tpi2),y
|
|
jsr Poll
|
|
pha
|
|
sta modkey
|
|
ora #$30
|
|
bne L3 ; Branch always
|
|
|
|
L2: jsr Poll
|
|
L3: ldx #$05
|
|
ldy #$00
|
|
L4: lsr a
|
|
bcc L5
|
|
inc keyscanbuf
|
|
dex
|
|
bpl L4
|
|
sec
|
|
ldy #TPI::PRB
|
|
lda (tpi2),y
|
|
rol a
|
|
sta (tpi2),y
|
|
ldy #TPI::PRA
|
|
lda (tpi2),y
|
|
rol a
|
|
sta (tpi2),y
|
|
bcs L2
|
|
pla
|
|
bcc NoKey ; Branch always
|
|
|
|
L5: ldy keyscanbuf
|
|
sty norkey
|
|
pla
|
|
asl a
|
|
asl a
|
|
asl a
|
|
bcc L6
|
|
bmi L7
|
|
lda (ktab2),y ; Shifted normal key
|
|
ldx graphmode
|
|
beq L8
|
|
lda (ktab3),y ; Shifted key in graph mode
|
|
bne L8
|
|
|
|
L6: lda (ktab4),y ; Key with ctrl pressed
|
|
bne L8
|
|
L7: lda (ktab1),y ; Normal key
|
|
L8: tax
|
|
cpx #$FF ; Valid key?
|
|
beq Done
|
|
cpy lastidx
|
|
beq Repeat
|
|
ldx #$13
|
|
stx rptdelay
|
|
ldx keyidx
|
|
cpx #$09
|
|
beq NoKey
|
|
cpy #$59
|
|
bne PutKey
|
|
cpx #$08
|
|
beq NoKey
|
|
sta keybuf,x
|
|
inx
|
|
bne PutKey
|
|
|
|
NoKey: ldy #$FF
|
|
Done: sty lastidx
|
|
End: lda #$7F
|
|
ldy #TPI::PRA
|
|
sta (tpi2),y
|
|
ldy #TPI::PRB
|
|
lda #$FF
|
|
sta (tpi2),y
|
|
rts
|
|
|
|
Repeat: dec rptdelay
|
|
bpl End
|
|
inc rptdelay
|
|
dec rptcount
|
|
bpl End
|
|
inc rptcount
|
|
ldx keyidx
|
|
bne End
|
|
|
|
PutKey: sta keybuf,x
|
|
inx
|
|
stx keyidx
|
|
ldx #$03
|
|
stx rptcount
|
|
bne Done
|
|
|
|
.endproc
|
|
|
|
|
|
; Poll the keyboard port until it's stable
|
|
|
|
.proc Poll
|
|
ldy #TPI::PRC
|
|
L1: lda (tpi2),y
|
|
sta keysave
|
|
lda (tpi2),y
|
|
cmp keysave
|
|
bne L1
|
|
rts
|
|
.endproc
|
|
|
|
|
|
|
|
|