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Updated version by Karri Kaksonen.

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git-svn-id: svn://svn.cc65.org/cc65/trunk@3771 b7a2c559-68d2-44c3-8de9-860c34a00d81
This commit is contained in:
cuz 2007-02-09 08:24:03 +00:00
parent 6a9a5eeafc
commit a47adefd7b
2 changed files with 79 additions and 74 deletions
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65
libsrc/lynx/cgetc.s
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@ -1,12 +1,13 @@
;
; Karri Kaksonen, 2004-11-01
; Karri Kaksonen, Harry Dodgson 2006-01-07
;
; char cgetc (void);
;
.export _cgetc
.import _kbhit
.import KBBUF
.import KBEDG
.import KBSTL
; --------------------------------------------------------------------------
; The Atari Lynx has a very small keyboard - only 3 keys
@ -19,23 +20,51 @@
; So the keyboard returns '1', '2', '3', 'P', 'R', 'F' or '?'.
_cgetc:
lda KBSTL
ora KBEDG
bne @L1
jsr _kbhit ; Check for char available
tax ; Test result
beq _cgetc
ldx #5 ; Wait for some time... 0.2 seconds or so.
@L1: ldy #255
@L2: lda #255
@L3: dec
bne @L3
dey
bne @L2
dex
bne @L1
jsr _kbhit ; Check for double pressed buttons
lda KBBUF
stz KBBUF
bra _cgetc
@L1:
ldx #0
and #1
beq @L6
lda KBEDG ; Pause button is pressed
and #$0c
beq @L3
ora KBSTL
@L2:
bit #$04
beq @L4 ; Pause + Opt 1 = Reset
bit #$08
beq @L5 ; Pause + Opt 2 = Flip
lda #'?' ; All buttons pressed
rts
@L3:
lda KBSTL ; Pause alone was the last placed button
and #$0c
bne @L2
lda #'P' ; Pause pressed
rts
@L4:
lda #'R' ; Reset pressed
rts
@L5:
lda #'F' ; Flip pressed
rts
@L6:
lda KBEDG ; No Pause pressed
ora KBSTL
bit #$08
beq @L8
bit #$04
beq @L7
lda #'3' ; opt 1 + opt 2 pressed
rts
@L7:
lda #'1' ; opt 1 pressed
rts
@L8:
lda #'2' ; opt 2 pressed
rts

86
libsrc/lynx/kbhit.s
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@ -1,11 +1,12 @@
;
; Karri Kaksonen, 2004-11-01
; Karri Kaksonen, Harry Dodgson 2006-01-06
;
; unsigned char kbhit (void);
;
.export _kbhit
.export KBBUF
.export KBEDG
.export KBSTL
.import return0, return1
; --------------------------------------------------------------------------
@ -19,61 +20,36 @@
; So the keyboard returns '1', '2', '3', 'P', 'R', 'F' or '?'.
.data
KBBUF: .byte 0
DEBOUNCE: .byte 0 ; Contains char until key is freed
KBTMP: .byte 0
KBPRV: .byte 0
KBEDG: .byte 0
KBSTL: .byte 0
KBDEB: .byte 0
KBNPR: .byte 0
.code
_kbhit:
lda $FCB1 ; Read the Pause key
lda $FCB0 ; Read the Opt buttons
and #$0c
sta KBTMP
lda $FCB1 ; Read Pause
and #1
bne @L4
lda $FCB0 ; No Pause pressed
and #$0c
bne @L1
stz DEBOUNCE ; No keys pressed at all
lda KBBUF ; But we may have some old key in the buffer
bne @L9
jmp return0 ; No key has been pressed
ora KBTMP ; 0000210P
tax
and KBPRV
sta KBSTL ; for multibutton
txa
and KBDEB
sta KBEDG ; for just depressed
txa
and KBNPR
sta KBDEB ; for debouncing
txa
eor #$ff
sta KBNPR ; inverted previous ones pressed
stx KBPRV
lda KBEDG
beq @L1
jmp return1 ; Key hit
@L1:
cmp #$0c
bne @L2
ldx #'3' ; Opt 1 + Opt 2 pressed
bra @L8
@L2:
cmp #$08
bne @L3
ldx #'1' ; Opt 1 pressed
bra @L8
@L3:
ldx #'2' ; Opt 2 pressed
bra @L8
@L4:
lda $FCB0
and #$0c
bne @L5
ldx #'P' ; Pause pressed
bra @L8
@L5:
cmp #$0c
bne @L6
ldx #'?' ; Opt 1 + Opt 2 + Pause pressed
bra @L8
@L6:
cmp #$08
bne @L7
ldx #'R' ; Restart pressed
bra @L8
@L7:
ldx #'F' ; Flip pressed
@L8:
lda KBBUF
bne @L10
lda DEBOUNCE
beq @L10
jmp return0 ; Return no key pressed until keys are released
@L10:
stx KBBUF
sta DEBOUNCE
@L9: jmp return1
jmp return0 ; No new keys hit