blob: aeea4c01aeb575e74abb84b3239afbf044685e88 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
|
WriteDMACodeToHRAM::
; Since no other memory is available during OAM DMA,
; DMARoutine is copied to HRAM and executed there.
ld c, hDMARoutine % $100
ld b, DMARoutineEnd - DMARoutine
ld hl, DMARoutine
.copy
ld a, [hli]
ldh [c], a
inc c
dec b
jr nz, .copy
ret
DMARoutine:
; initiate DMA
ld a, wOAMBuffer / $100
ld [rDMA], a
; wait for DMA to finish
ld a, $28
.wait
dec a
jr nz, .wait
ret
DMARoutineEnd:
|