Use rgbds 0.5.0 features:

- FOR loops
- {interpolation}
- REDEF EQUS
- \# for all macro args

home/vcopy.asm

@@ -23,7 +23,7 @@ ClearBgMap::
 	jr .next
 	ld a, l
 .next
-	ld de, $400 ; size of VRAM background map
+	ld de, BG_MAP_WIDTH * BG_MAP_HEIGHT
 	ld l, e
 .loop
 	ld [hli], a
@@ -69,7 +69,7 @@ RedrawRowOrColumn::
 .noCarry
 ; the following 4 lines wrap us from bottom to top if necessary
 	ld a, d
-	and $03
+	and $3
 	or $98
 	ld d, a
 	dec c
@@ -169,21 +169,19 @@ AutoBgMapTransfer::
 
 TransferBgRows::
 ; unrolled loop and using pop for speed
-
-	REPT 20 / 2 - 1
+REPT SCREEN_WIDTH / 2 - 1
 	pop de
 	ld [hl], e
 	inc l
 	ld [hl], d
 	inc l
-	ENDR
-
+ENDR
 	pop de
 	ld [hl], e
 	inc l
 	ld [hl], d
 
-	ld a, 32 - (20 - 1)
+	ld a, BG_MAP_WIDTH - (SCREEN_WIDTH - 1)
 	add l
 	ld l, a
 	jr nc, .ok
@@ -261,7 +259,7 @@ VBlankCopyDouble::
 	ldh [hVBlankCopyDoubleSize], a
 
 .loop
-	REPT 3
+REPT LEN_2BPP_TILE / 4 - 1
 	pop de
 	ld [hl], e
 	inc l
@@ -271,8 +269,7 @@ VBlankCopyDouble::
 	inc l
 	ld [hl], d
 	inc l
-	ENDR
-
+ENDR
 	pop de
 	ld [hl], e
 	inc l
@@ -339,14 +336,13 @@ VBlankCopy::
 	ldh [hVBlankCopySize], a
 
 .loop
-	REPT 7
+REPT LEN_2BPP_TILE / 2 - 1
 	pop de
 	ld [hl], e
 	inc l
 	ld [hl], d
 	inc l
-	ENDR
-
+ENDR
 	pop de
 	ld [hl], e
 	inc l