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40 lines
657 B
40 lines
657 B
INCLUDE "hardware.inc"
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SECTION "OAM Mirror", WRAM0, ALIGN[8]
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_OAM:: ds OAM_COUNT * sizeof_OAM_ATTRS
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_OAM_end:
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SECTION "OAM Code", ROM0
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; Initialize OAM
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OAM_Init::
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; Clear internal OAM
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ld hl, _OAM
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xor a
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ld c, _OAM_end - _OAM
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call memset
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; Copy DMA transfer routine to HRAM
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ld hl, waitForDMA
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ld bc, DMA_Start
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ld d, waitForDMA_end - waitForDMA
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call memcpy
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ret
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; Wait for DMA transfer from $XX00 to complete (~160 cycles)
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; @param a $XX
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waitForDMA:
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ld [rDMA], a
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ld a, 40
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.wait:
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dec a
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jr nz, .wait
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ret
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waitForDMA_end:
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SECTION "OAM DMA", HRAM
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DMA_Start::
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ds waitForDMA_end - waitForDMA
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