76 lines
1.1 KiB
ArmAsm
76 lines
1.1 KiB
ArmAsm
;====================
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; hgr input
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;====================
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; TODO: save to string
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; TODO: arbitrary Y location
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; TODO: when backspacing, erase old char not XOR
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hgr_input:
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bit KEYRESET
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ldx #0
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ldy #184
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lda #'>'
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jsr hgr_put_char
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ldx #1
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stx INPUT_X
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hgr_input_loop:
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lda KEYPRESS
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bpl hgr_input_loop
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bit KEYRESET
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and #$7f ; trim off top?
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cmp #13 ; if return, then done
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beq done_hgr_input
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cmp #$7f ; check if backspace
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beq hgr_input_backspace
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cmp #8
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beq hgr_input_backspace
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ldx INPUT_X
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sta input_buffer-1,X ; store to buffer
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ldy #184 ; print char
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ldx INPUT_X
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jsr hgr_put_char
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ldx INPUT_X
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cpx #38
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bcs input_too_big ; FIXME this is a hack
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inc INPUT_X
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input_too_big:
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jmp hgr_input_loop
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hgr_input_backspace:
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ldx INPUT_X
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cpx #1 ; don't backspace too far
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beq hgr_input_loop
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dec INPUT_X
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ldx INPUT_X
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lda input_buffer-1,X ; load old char
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ldy #184
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jsr hgr_put_char ; xor it on top
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jmp hgr_input_loop
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done_hgr_input:
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ldx INPUT_X ; NUL terminate
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lda #0
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sta input_buffer-1,X
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rts
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input_buffer:
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.byte 0,0,0,0,0,0,0,0,0,0
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.byte 0,0,0,0,0,0,0,0,0,0
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.byte 0,0,0,0,0,0,0,0,0,0
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.byte 0,0,0,0,0,0,0,0,0,0
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