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45 lines
910 B
NASM
45 lines
910 B
NASM
; This function is used to wait a short period after printing a letter to the
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; screen unless the player presses the A/B button or the delay is turned off
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; through the [wd730] or [wLetterPrintingDelayFlags] flags.
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PrintLetterDelay::
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ld a, [wd730]
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bit 6, a
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ret nz
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ld a, [wLetterPrintingDelayFlags]
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bit 1, a
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ret z
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push hl
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push de
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push bc
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ld a, [wLetterPrintingDelayFlags]
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bit 0, a
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jr z, .waitOneFrame
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ld a, [wOptions]
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and $f
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ldh [hFrameCounter], a
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jr .checkButtons
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.waitOneFrame
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ld a, 1
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ldh [hFrameCounter], a
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.checkButtons
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call Joypad
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ldh a, [hJoyHeld]
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.checkAButton
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bit 0, a ; is the A button pressed?
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jr z, .checkBButton
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jr .endWait
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.checkBButton
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bit 1, a ; is the B button pressed?
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jr z, .buttonsNotPressed
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.endWait
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call DelayFrame
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jr .done
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.buttonsNotPressed ; if neither A nor B is pressed
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ldh a, [hFrameCounter]
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and a
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jr nz, .checkButtons
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.done
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pop bc
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pop de
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pop hl
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ret
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