pokecrystal-board/home/delay.asm

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DelayFrame::
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; Wait for one frame
ld a, 1
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ldh [hVBlankOccurred], a
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; Wait for the next VBlank, halting to conserve battery
.halt
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halt
nop
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ldh a, [hVBlankOccurred]
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and a
jr nz, .halt
ret
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DelayFrames::
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; Wait c frames
call DelayFrame
dec c
jr nz, DelayFrames
ret