2014-05-26 02:23:12 +00:00
|
|
|
WriteDMACodeToHRAM:
|
|
|
|
; Since no other memory is available during OAM DMA,
|
|
|
|
; DMARoutine is copied to HRAM and executed there.
|
|
|
|
ld c, $ff80 % $100
|
|
|
|
ld b, DMARoutineEnd - DMARoutine
|
|
|
|
ld hl, DMARoutine
|
|
|
|
.copy
|
|
|
|
ld a, [hli]
|
|
|
|
ld [$ff00+c], a
|
|
|
|
inc c
|
|
|
|
dec b
|
|
|
|
jr nz, .copy
|
|
|
|
ret
|
|
|
|
|
|
|
|
DMARoutine:
|
|
|
|
; initiate DMA
|
2014-05-27 18:08:52 +00:00
|
|
|
ld a, wOAMBuffer / $100
|
2015-07-19 03:49:52 +00:00
|
|
|
ld [rDMA], a
|
2014-05-26 02:23:12 +00:00
|
|
|
|
|
|
|
; wait for DMA to finish
|
|
|
|
ld a, $28
|
2015-07-14 07:16:19 +00:00
|
|
|
.wait
|
|
|
|
dec a
|
2014-05-26 02:23:12 +00:00
|
|
|
jr nz, .wait
|
|
|
|
ret
|
|
|
|
DMARoutineEnd:
|