dos33fsprogs/games/peasant/keyboard.s

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;==========================
; check keyboard
; for main game
;==========================
; Movement
; Note in the game, pressing a key starts walking
; To stop you have to press the same direction again
; Text
; We require ENTER/RETURN pressed before entering text
; this is mildly annoying, but lets us use
; WASD to walk. The Apple II+ doesn't have
; up or down buttons
check_keyboard:
lda KEYPRESS
bmi key_was_pressed
rts
key_was_pressed:
and #$7f ; strip off high bit
;==========================
; Left
;==========================
check_left:
cmp #$8
beq left_pressed
cmp #'A'
bne check_right
left_pressed: ; if peasant_moving_left, stop
; otherwise clear all movement, move left
ldx PEASANT_XADD
jsr stop_peasant
cpx #$FF ; if not left, start moving left
beq continue_left
lda #$FF ; move left
sta PEASANT_XADD
continue_left:
lda #PEASANT_DIR_LEFT
sta PEASANT_DIR
jmp done_check_keyboard
check_right:
cmp #$15
beq right_pressed
cmp #'D'
bne check_up
right_pressed:
ldx PEASANT_XADD
jsr stop_peasant
cpx #$1 ; if already right, stop
beq continue_right
lda #$1
sta PEASANT_XADD
continue_right:
lda #PEASANT_DIR_RIGHT
sta PEASANT_DIR
jmp done_check_keyboard
check_up:
cmp #'W'
beq up_pressed
cmp #$0B
bne check_down
up_pressed:
ldx PEASANT_YADD
jsr stop_peasant
cpx #$FC ; if already up, stop
beq continue_up
lda #$FC
sta PEASANT_YADD
continue_up:
lda #PEASANT_DIR_UP
sta PEASANT_DIR
jmp done_check_keyboard
check_down:
cmp #'S'
beq down_pressed
cmp #$0A
bne check_enter
down_pressed:
ldx PEASANT_YADD
jsr stop_peasant
cpx #$04 ; if already down, stop
beq continue_down
lda #$4
sta PEASANT_YADD
continue_down:
lda #PEASANT_DIR_DOWN
sta PEASANT_DIR
jmp done_check_keyboard
check_enter:
cmp #13
beq enter_pressed
cmp #' '
bne done_check_keyboard
enter_pressed:
jsr clear_bottom
jsr hgr_input
jsr parse_input
jsr clear_bottom
done_check_keyboard:
bit KEYRESET
rts
stop_peasant:
lda #0
sta PEASANT_XADD
sta PEASANT_YADD
rts