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Add blinking cursor on input
git-svn-id: svn://svn.cc65.org/cc65/trunk@944 b7a2c559-68d2-44c3-8de9-860c34a00d81
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cuz
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@ -21,6 +21,7 @@ OBJS = _scrsize.o \
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cputc.o \
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crt0.o \
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kbhit.o \
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kblncur.o \
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kirq.o \
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kplot.o \
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kscnkey.o \
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@ -1,11 +1,10 @@
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;
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; Ullrich von Bassewitz, 06.08.1998
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; Ullrich von Bassewitz, 16.09.2001
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;
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; char cgetc (void);
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;
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.export _cgetc
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.import plot, write_crtc
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.import cursor
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.include "zeropage.inc"
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@ -16,23 +15,81 @@
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.proc _cgetc
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L1: lda KeyIndex
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beq L1
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lda KeyIndex ; Characters waiting?
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bne L3 ; Jump if so
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L2: ldx #$00 ; Get index
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ldy KeyBuf ; Get first character in the buffer
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sei
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L3: lda KeyBuf+1,x ; Move up the remaining chars
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sta KeyBuf,x
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; Switch on the cursor if needed
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lda CURS_FLAG
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pha
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lda cursor
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jsr setcursor
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L1: lda KeyIndex
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beq L1
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ldx #0
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pla
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bne L2
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inx
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cpx KeyIndex
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bne L3
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dec KeyIndex
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L2: txa
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jsr setcursor
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; Read the character from the keyboard buffer
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L3: ldx #$00 ; Get index
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ldy KeyBuf ; Get first character in the buffer
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sei
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L4: lda KeyBuf+1,x ; Move up the remaining chars
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sta KeyBuf,x
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inx
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cpx KeyIndex
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bne L4
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dec KeyIndex
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cli
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ldx #$00 ; High byte
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tya ; First char from buffer
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ldx #$00 ; High byte
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tya ; First char from buffer
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rts
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.endproc
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; ------------------------------------------------------------------------
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;
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.proc setcursor
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ldy #$00 ;
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tax ; On or off?
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bne @L9 ; Go set it on
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lda CURS_FLAG ; Is the cursor currently off?
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bne @L8 ; Jump if yes
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lda #1
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sta CURS_FLAG ; Mark it as off
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lda CURS_STATE ; Cursor currently displayed?
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sty CURS_STATE ; Cursor will be cleared later
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beq @L8 ; Jump if no
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; Switch to the system bank, load Y with the cursor X coordinate
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lda #$0F
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sta IndReg ; Access system bank
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ldy CURS_X
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; Reset the current cursor
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lda CURS_COLOR
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sta (CRAM_PTR),y ; Store cursor color
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lda ExecReg
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sta IndReg ; Switch to our segment
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lda (SCREEN_PTR),y
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eor #$80 ; Toggle reverse flag
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sta (SCREEN_PTR),y
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; Done
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@L8: rts
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@L9: sty CURS_FLAG ; Cursor on (Y = 0)
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rts
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.endproc
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56
libsrc/cbm510/kblncur.s
Normal file
56
libsrc/cbm510/kblncur.s
Normal file
@ -0,0 +1,56 @@
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;
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; Ullrich von Bassewitz, 16.09.2001
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;
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.export k_blncur
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.include "zeropage.inc"
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; ------------------------------------------------------------------------
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; Blink the cursor in the interrupt
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.proc k_blncur
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lda CURS_FLAG ; Is the cursor on?
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bne curend ; Jump if not
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dec CURS_BLINK
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bne curend
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; Re-initialize the blink counter
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lda #20 ; Initial value
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sta CURS_BLINK
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; Switch to the system bank, load Y with the cursor X coordinate
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lda #$0F
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sta IndReg ; Access system bank
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ldy CURS_X
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; Check if the cursor state was on or off before
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lda CURS_COLOR ; Load color behind cursor
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lsr CURS_STATE ; Cursor currently displayed?
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bcs curset ; Jump if yes
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; Cursor was off before, switch it on
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inc CURS_STATE ; Mark as displayed
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lda (CRAM_PTR),y ; Get color behind cursor...
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sta CURS_COLOR ; ...and remember it
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lda CHARCOLOR ; Use character color
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; Set the cursor with color in A
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curset: sta (CRAM_PTR),y ; Store cursor color
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lda ExecReg
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sta IndReg ; Switch to our segment
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lda (SCREEN_PTR),y
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eor #$80 ; Toggle reverse flag
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sta (SCREEN_PTR),y
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curend: rts
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.endproc
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@ -5,7 +5,7 @@
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;
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.export irq, nmi, k_irq, k_nmi
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.import k_scnkey, k_udtim, k_rs232
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.import k_blncur, k_scnkey, k_udtim, k_rs232
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.importzp tpi1
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.include "zeropage.inc"
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@ -72,6 +72,7 @@ k_irq:
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cmp #%00000001 ; ticker irq?
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bne irq1
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jsr k_blncur ; Blink the cursor
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jsr k_scnkey ; Poll the keyboard
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jsr k_udtim ; Bump the time
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@ -93,13 +93,13 @@ ScreenRight = $DF
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ModKey = $E0
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NorKey = $E1
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BitTable = $E2
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BlinkOn = $E6
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BlinkCounter = $E7
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CURS_FLAG = $E6 ; 1 = no cursor
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CURS_BLINK = $E7 ; cursor blink counter
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CRAM_PTR = $E8
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TempColor = $EA
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BlinkSwitch = $EB
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CURS_STATE = $EB ; Cursor blink state
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CHARCOLOR = $EC
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CursBackColor = $ED ; Color behind cursor
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CURS_COLOR = $ED ; Color behind cursor
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OutCharTmp = $EE
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ScreenSeq = $EF ; Segment of video RAM
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