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| author | dannye <33dannye@gmail.com> | 2020-11-04 00:06:44 -0600 |
|---|---|---|
| committer | dannye <33dannye@gmail.com> | 2020-11-04 00:06:44 -0600 |
| commit | 5647ca687b92954dcf37a6ea6bfbc9a341c32de4 (patch) | |
| tree | dde1937a1bfdb3a835f4155e1c2eb8f1aaf86f63 /engine/gfx/oam_dma.asm | |
| parent | Merge pull request #55 from Deokishisu/patch-1 (diff) | |
| download | pokeyellow-5647ca687b92954dcf37a6ea6bfbc9a341c32de4.tar.gz pokeyellow-5647ca687b92954dcf37a6ea6bfbc9a341c32de4.tar.xz pokeyellow-5647ca687b92954dcf37a6ea6bfbc9a341c32de4.zip | |
Sync with pokered
Diffstat (limited to 'engine/gfx/oam_dma.asm')
| -rw-r--r-- | engine/gfx/oam_dma.asm | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/engine/gfx/oam_dma.asm b/engine/gfx/oam_dma.asm new file mode 100644 index 00000000..fe93e90d --- /dev/null +++ b/engine/gfx/oam_dma.asm @@ -0,0 +1,28 @@ +WriteDMACodeToHRAM:: +; Since no other memory is available during OAM DMA, +; DMARoutine is copied to HRAM and executed there. + ld c, LOW(hDMARoutine) + ld b, DMARoutineEnd - DMARoutine + ld hl, DMARoutine +.copy + ld a, [hli] + ldh [c], a + inc c + dec b + jr nz, .copy + ret + +DMARoutine: +LOAD "OAM DMA", HRAM +hDMARoutine:: + ; initiate DMA + ld a, HIGH(wOAMBuffer) + ldh [rDMA], a + ; wait for DMA to finish + ld a, $28 +.wait + dec a + jr nz, .wait + ret +ENDL +DMARoutineEnd: |