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-rw-r--r--test/input.s230
1 files changed, 162 insertions, 68 deletions
diff --git a/test/input.s b/test/input.s
index 95b4077..169372f 100644
--- a/test/input.s
+++ b/test/input.s
@@ -6,23 +6,27 @@
; Initalize some variables.
.org $1000
-string:
- .byte "Please, type something.\n"
-string2:
- .byte "You typed, "
-end:
- .byte $0
scr_row:
- .word $0
+ .byte $0
scr_col:
- .word $0
+ .byte $0
a:
.word $0
b:
.word $0
+c:
+ .word $0
+d:
+ .word $0
+string:
+ .byte "Please, type something.\n"
+string2:
+ .byte "You typed, "
+end:
+ .byte $0
; Input buffer.
-.org $2000
+.org $0000
buffer:
; Main program
@@ -42,7 +46,7 @@ clr_buf:
start:
ldx.w #$0 ; Reset x.
- ldy #$0 ; Reset y.
+ ldy.w #$0 ; Reset y.
jmp print
rset_a:
@@ -66,6 +70,14 @@ print:
beq rset_a ; Did we find a null terminator?
sta $C001 ; Print character.
inx ; Increment offset.
+ cmp #$A
+ beq inc_row
+ inc scr_col
+ jmp print
+inc_row:
+ inc scr_row
+ lda #$0
+ sta scr_col
jmp print ; Keep printing more characters.
getchar:
@@ -79,98 +91,157 @@ getchar:
cmp #$7F
beq bs ; Did the user type a backspace?
echo:
+ sta a
+ ldx scr_col
+ cpx #$79
+ bne echo_print
+linewrap:
+ inc scr_row
+ ldx #$0
+ stx scr_col
+ jsr update_pos
+echo_print:
+ lda a
sta $C001 ; Echo typed character.
+ inc scr_col ; Increment the cursor's x coordinate.
sta buffer, y ; Store typed character into the input buffer.
- iny ; Increment buffer offset.
- jmp rset_a ; We are not, so add the backspace to the buffer.
+ iny ; Increment the buffer offset.
+ jmp rset_a ; Start getting user input.
esc:
lda $C000 ; Skip the '['.
lda $C000 ; Get the next character.
- beq read ; We have an error, so discard it, and read the next character.
+ beq read ; We have an error, so discard it, and go back to getting user input.
lda $C002 ; Get the escape code.
- cmp #$41 ; Did the user press the up arrow?
+ sta c ; Store the escape code, until we need it.
+ jsr isup ; Check if the user pressed up.
+ lda d
+ cmp #$0
+ bne esc_end
+ jsr isdown ; Check if the user pressed down.
+ lda d
+ cmp #$0
+ bne esc_end
+ lda #$0
+ jsr isleft ; Check if the user pressed left.
+ lda d
+ cmp #$0
+ bne esc_end
+ jsr isright ; Check if the user pressed right.
+esc_end:
+ lda #$0
+ sta d
+ jmp rset_a ; Go back to getting user input.
+
+isup:
+ lda scr_row ; Is the cursor at the top of the screen?
+ beq isup_done ; Yes, so return.
+ lda c ; No, so load the escape code back into the accumulator.
+ cmp #$41 ; Did the user press the up arrow key?
beq up ; Yes, so move the cursor up.
- cmp #$42 ; Did the user press the down arrow?
+isup_done:
+ rts ; End of isup.
+
+isdown:
+ lda scr_row ; Start checking the y coordinate of the cursor.
+ cmp #$17 ; Is the cursor at the bottom of the screen?
+ beq isdown_done ; Yes, so return.
+ lda c ; No, so load the escape code back into the accumulator.
+ cmp #$42 ; Did the user press the down arrow key?
beq down ; Yes, so move the cursor down.
- cmp #$43 ; Did the user press the right arrow?
+isdown_done:
+ rts ; End of isdown.
+
+isright:
+ lda scr_col ; Start checking the x coordinate of the cursor.
+ cmp #$4F ; Is the cursor at the far right of the screen?
+ beq isright_end ; Yes, so return.
+ lda c ; No, so load the escape code back into the accumulator.
+ cmp #$43 ; Did the user press the right arrow key?
beq right ; Yes, so move the cursor right.
- cmp #$44 ; Did the user press the left arrow?
+isright_end:
+ rts ; End of isright.
+
+isleft:
+ lda scr_col ; Is the cursor at the far left of the screen?
+ beq isleft_done ; Yes, so return.
+ lda c ; No, so load the escape code back into the accumulator.
+ cmp #$44 ; Did the user press the left arrow key?
beq left ; Yes, so move the cursor left.
+isleft_done:
+ rts ; End of isleft.
+
up:
- lda scr_row
- beq rset_a
dec scr_row
jsr update_pos
- lda #$1B
- sta $C001
- lda #$5B
- sta $C001
- lda #$41
- sta $C001
- jmp rset_a
+ lda #$1
+ sta d
+ jmp isup_done
down:
inc scr_row
jsr update_pos
- lda #$1B
- sta $C001
- lda #$5B
- sta $C001
- lda #$42
- sta $C001
- jmp rset_a
+ lda #$1
+ sta d
+ jmp isdown_done
right:
- lda scr_col
- cmp #$50
- beq rset_a
inc scr_col
jsr update_pos
- lda #$1B
- sta $C001
- lda #$5B
- sta $C001
- lda #$43
- sta $C001
- jmp rset_a
+ jmp isright_end
left:
- lda scr_col
- beq rset_a
dec scr_col
jsr update_pos
- lda #$1B
- sta $C001
- lda #$5B
- sta $C001
- lda #$44
- sta $C001
- jmp rset_a
+ lda #$1
+ sta d
+ jmp isleft_done
update_pos:
- lda #$1B
- sta $C001
- lda #$5B
- sta $C001
- lda scr_row
- jsr uint_to_bcd
- jmp spin
+ lda #$1B ; Print an escape character
+ sta $C001 ; to the screen.
+ lda #$5B ; Print '['
+ sta $C001 ; to the screen, and start the escape sequence.
+ jsr getrow ; Start printing the row number to the screen.
+ jsr getcol ; Start printing the column number to the screen.
+ lda #$48 ; Print 'H'
+ sta $C001 ; to the screen.
+ rts ; End of update_pos.
+getrow:
+ lda scr_row ; Get the cursor's y coordinate.
+ div #$A ; Divide A by 10.
+ adc #$30 ; Convert it to ascii, and
+ sta $C001 ; print to the screen.
+ tba ; Get the remainder.
+ adc #$30 ; Convert it to ascii, and
+ sta $C001 ; print to the screen.
+ rts ; End of getrow.
+getcol:
+ lda #$3B ; Print ';'
+ sta $C001 ; to the screen.
+ lda scr_col ; Get the cursor's x coordinate.
+ div #$A ; Divide A by 10.
+ adc #$30 ; Convert it to ascii, and
+ sta $C001 ; print to the screen.
+ tba ; Get the remainder.
+ adc #$30 ; Convert it to ascii, and
+ sta $C001 ; print to the screen.
+ rts ; End of getrow.
uint_to_bcd:
- div #$A
- lsl #$4
- sta a
- tba
- sta b
- lda a
- ora b
- rts
+ div #$A ; Divide A by 10.
+ lsl #$4 ; Shift the result left by 4 bits.
+ sta a ; Store the result for later.
+ tba ; Get the remainder.
+ sta b ; Store the remainder for later.
+ lda a ; Get the result.
+ ora b ; Or the result, with the remainder.
+ rts ; We've converted the value to BCD, so return.
nl:
lda #$A
sta $C001
inc scr_row
- jsr update_pos
lda #$0 ; Replace newline with a null terminator.
sta buffer, y ; Store said terminator into the input buffer.
+ sta scr_col
ldy.w #$0 ; Reset y, to print the result.
jmp result
@@ -179,6 +250,7 @@ back:
lda #$0 ; Put a null terminator, in place of the backspace.
sta buffer, y ; Place it into the input buffer.
dey ; Decrement buffer offset.
+ dec scr_col
jmp read ; Get next character.
bs:
@@ -187,9 +259,19 @@ bs:
jmp back ; We are not, so add the backspace to the buffer.
result:
+ ldx scr_col
+ cpx #$79
+ bne result_print
+linewrap:
+ inc scr_row
+ ldx #$0
+ stx scr_col
+ jsr update_pos
+result_print:
lda string2, y
beq rset_y ; Reset y, if we hit the null terminator.
sta $C001 ; Print 'You have typed, '
+ inc scr_col ; Increment the cursor's x coordinate.
iny ; Increment offset.
jmp result ; Keep printing.
@@ -199,9 +281,19 @@ rset_y:
jmp print_buf ; Print the input buffer.
print_buf:
+ ldx scr_col
+ cpx #$79
+ bne buf_print
+linewrap:
+ inc scr_row
+ ldx #$0
+ stx scr_col
+ jsr update_pos
+buf_print:
lda buffer, y ; Get a character from the input buffer.
beq spin ; Are we done with printing the buffer?
sta $C001 ; Print said character.
+ inc scr_col ; Increment the cursor's x coordinate.
iny
jmp print_buf ; Keep printing the buffer.
@@ -229,6 +321,8 @@ spin:
viewmem
.org $8100
viewmem
+.org $8200
+viewmem
;q
done