ref: 3648afda1694fcb4d6fe6625b14f5a3f8bc29c38
dir: /engine/phone/phonering_copytilemapatonce.asm/
PhoneRing_CopyTilemapAtOnce: ldh a, [hCGB] and a jp z, WaitBGMap ld a, [wSpriteUpdatesEnabled] cp $0 jp z, WaitBGMap ; The following is a modified version of _CopyTilemapAtOnce ; that waits for [rLY] to be LY_VBLANK - 1 instead of $80 - 1. ldh a, [hBGMapMode] push af xor a ldh [hBGMapMode], a ldh a, [hMapAnims] push af xor a ldh [hMapAnims], a .wait ldh a, [rLY] cp LY_VBLANK - 1 jr c, .wait di ld a, BANK(vBGMap2) ldh [rVBK], a hlcoord 0, 0, wAttrmap call .CopyBGMapViaStack ld a, BANK(vBGMap0) ldh [rVBK], a hlcoord 0, 0 call .CopyBGMapViaStack .wait2 ldh a, [rLY] cp LY_VBLANK - 1 jr c, .wait2 ei pop af ldh [hMapAnims], a pop af ldh [hBGMapMode], a ret .CopyBGMapViaStack: ; Copy all tiles to vBGMap ld [hSPBuffer], sp ld sp, hl ldh a, [hBGMapAddress + 1] ld h, a ld l, 0 ld a, SCREEN_HEIGHT ldh [hTilesPerCycle], a ld b, 1 << 1 ; not in v/hblank ld c, LOW(rSTAT) .loop rept SCREEN_WIDTH / 2 pop de ; if in v/hblank, wait until not in v/hblank .loop\@ ldh a, [c] and b jr nz, .loop\@ ; load vBGMap ld [hl], e inc l ld [hl], d inc l endr ld de, BG_MAP_WIDTH - SCREEN_WIDTH add hl, de ldh a, [hTilesPerCycle] dec a ldh [hTilesPerCycle], a jr nz, .loop ldh a, [hSPBuffer] ld l, a ldh a, [hSPBuffer + 1] ld h, a ld sp, hl ret