X-Git-Url: http://git.joshuawise.com/fpgaboy.git/blobdiff_plain/f6fa1d6e1393de5d18302b8674ed1616afdfcefb..5c83453744afce2e0415f839e8274156b69df83e:/diag.asm

diff --git a/diag.asm b/diag.asm
index 8e09874..3a3d665 100644
--- a/diag.asm
+++ b/diag.asm
@@ -1,9 +1,8 @@
-	section "end",HOME[1024]
-	nop
-
 	SECTION "a",HOME[$00]
 
-start: jp main
+start:	ld a, $AA
+	ld [$FF51], a
+	jr start
 	
 	section "vbl",HOME[$40]
 	jp vbl
@@ -14,6 +13,19 @@ start: jp main
 	section "tmro",HOME[$50]
 	jp tmro
 
+	SECTION "b",HOME[$100]
+boot:	jr main		; $0100
+	nop		; $0102
+	nop		; $0103
+	;Nintendo Logo	; $0104
+	DB $CE,$ED,$66,$66,$CC,$0D,$00,$0B,$03,$73,$00,$83,$00,$0C,$00,$0D 
+	DB $00,$08,$11,$1F,$88,$89,$00,$0E,$DC,$CC,$6E,$E6,$DD,$DD,$D9,$99 
+	DB $BB,$BB,$67,$63,$6E,$0E,$EC,$CC,$DD,$DC,$99,$9F,$BB,$B9,$33,$3E
+	;$0134 
+	DB $00,$E7,$00,$00,$00,$00,$00,$00, $00,$00,$00,$00,$00,$00,$00,$00
+	;$0144
+	DB $00,$00,$00,$00,$00,$00,$00,$00, $00,$00,$00,$00,$00,$00,$00,$00
+
 main:
 	ld a, $FF
 	ld c, $51
@@ -32,6 +44,11 @@ main:
 	
 	ld hl, signon
 	call puts
+
+	ld a, $91
+	ld [$FF40], a
+
+	call putscreen
 	
 	ei
 
@@ -48,6 +65,90 @@ main:
 signon:
 	db $0D,$0A,$1B,"[1mFPGABoy Diagnostic ROM",$1B,"[0m",$0D,$0A,0
 
+tiles:
+	db %01111100
+	db %11000110
+	db %11000110
+	db %11111110
+	db %11000110
+	db %11000110
+	db %11000110
+	db %00000000
+	
+	db %11111100
+	db %11000110
+	db %11000110
+	db %11111100
+	db %11000110
+	db %11000110
+	db %11111100
+	db %00000000
+
+	db %01111100
+	db %11000110
+	db %11000010
+	db %11000000
+	db %11000010
+	db %11000110
+	db %01111100
+	db %00000000
+
+	db %11111100
+	db %11000110
+	db %11000110
+	db %11000110
+	db %11000110
+	db %11000110
+	db %11111100
+	db %00000000
+
+putscreen:
+	LD A,$fc		; $001d  Setup BG palette
+	LD [$FF47],A	; $001f
+
+	; Wait for vblank
+	call .vblwait
+
+	ld hl, $8000	; Copy two tiles.
+	ld de, tiles
+	ld c, $20
+.cloop:	ld a, [de]
+	inc de
+	ld [hli], a
+	ld [hli], a
+	dec c
+	xor a
+	cp c
+	jr nz, .cloop
+	
+	ld hl, $9800
+.vloop:	call .vblwait
+	ld c, $40
+	ld b, 0
+.loop:	ld a, b
+	inc b
+	and $03
+	ld [hli], a
+	ld a, h
+	cp $9C
+	ret z
+	dec c
+	xor a
+	cp c
+	jr nz,.loop
+	jr .vloop
+
+.vblwait:
+.stat1:	ld a, [$FF41]	; STAT
+	and $03
+	cp $00
+	jp nz, .stat1
+.stat2:	ld a, [$FF41]
+	and $03
+	cp $01
+	jr nz, .stat2
+	ret
+
 vbl:
 	PUSH AF
 	PUSH BC
@@ -57,11 +158,23 @@ vbl:
 	xor a
 	ld [$FF0F], a
 
-	ld c, $42	; SCY
-	ld a, [c]
-	inc a
-	ld [c], a
+	ld a, [$FF51]
+	bit 7, a
+	jr z, .nothing
 
+	bit 0, a
+	call nz, .scyup
+	
+	bit 1, a
+	call nz, .scydown
+	
+	bit 2, a
+	call nz, .scxup
+	
+	bit 3, a
+	call nz, .scxdown
+
+.nothing:
 	POP HL
 	POP DE
 	POP BC
@@ -69,6 +182,23 @@ vbl:
 
 	RETI
 
+.scyup:	ld hl, $FF42
+	inc [hl]
+	ret
+
+.scydown:	ld hl, $FF42
+	dec [hl]
+	ret
+
+.scxup:	ld hl, $FF43
+	inc [hl]
+	ret
+
+.scxdown:	ld hl, $FF43
+	dec [hl]
+	ret	
+	
+
 lcdc:
 	PUSH AF
 	PUSH BC
@@ -203,8 +333,8 @@ waitsw:
 	ld a,[c]
 	cp $0
 	jr z,.loop1
-.loop2:
-	ld a,[c]
+
+.loop2:	ld a,[c]
 	cp $0
 	jr nz,.loop2
 	ret
@@ -347,14 +477,14 @@ insntest:
 
 ; Serial port manipulation functions.
 putc:
-	ld c, $50
+	ld c, $53
 	push af
 .waitport:
 	ld a,[c]
-	cp $00
+	and $01
 	jr nz,.waitport
 	pop af
-	ld [c],a
+	ld [$FF52],a
 	ret
 
 puts: