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25 lines
405 B
NASM
25 lines
405 B
NASM
WriteDMACodeToHRAM:
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; Since no other memory is available during OAM DMA,
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; DMARoutine is copied to HRAM and executed there.
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ld c, $ff80 % $100
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ld b, DMARoutineEnd - DMARoutine
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ld hl, DMARoutine
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.copy
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ld a, [hli]
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ld [$ff00+c], a
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inc c
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dec b
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jr nz, .copy
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ret
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DMARoutine:
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; initiate DMA
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ld a, $c3
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ld [$ff46], a
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; wait for DMA to finish
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ld a, $28
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.wait dec a
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jr nz, .wait
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ret
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DMARoutineEnd:
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