X-Git-Url: http://git.joshuawise.com/fpgaboy.git/blobdiff_plain/00573fd53c3dc0b2aca146f085d30801a3aed576..eaec80f24007825c7abba2affd76f74d520ce4cd:/diag.asm?ds=inline

diff --git a/diag.asm b/diag.asm
index 8d6aec8..3a3d665 100644
--- a/diag.asm
+++ b/diag.asm
@@ -1,6 +1,8 @@
 	SECTION "a",HOME[$00]
 
-start: jp main
+start:	ld a, $AA
+	ld [$FF51], a
+	jr start
 	
 	section "vbl",HOME[$40]
 	jp vbl
@@ -11,19 +13,30 @@ 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, $FF
-	ld [$FF51],a
+	ld c, $51
+	ld [c], a
 
-;	ld a, $04
-;	ld [$FFFF], a
-	
 	ld sp, $DFF0
 	
 	ld a, $04	;start timer, 4.096KHz
 	ld c, $07
 	ld [c], a
-
+	
 	ld hl, $DF81
 	xor a
 	ld [hli], a
@@ -31,6 +44,11 @@ main:
 	
 	ld hl, signon
 	call puts
+
+	ld a, $91
+	ld [$FF40], a
+
+	call putscreen
 	
 	ei
 
@@ -47,14 +65,148 @@ 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 $01
+	jr nz, .stat2
+	ret
+
 vbl:
+	PUSH AF
+	PUSH BC
+	PUSH DE
+	PUSH HL
+	
+	xor a
+	ld [$FF0F], 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
+	POP AF
+
+	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
 	
 	xor a
-	ld c, $0F
-	ld [c], a
+	ld [$FF0F], a
 	
+	POP BC
 	POP AF
 	
 	reti
@@ -66,22 +218,23 @@ tmro:
 	PUSH HL
 	
 	xor a
-	ld c, $0F
+	ld [$FF0F], a
+	
+	ld c, $45	; LYC
+	ld a, [c]
+	inc a
 	ld [c], a
 	
-	ld hl, $DF82
-	ld a, [hld]
+	ld a, [$DF82]
 	cp 0
 	jr z, .noprint
 	ld a, $41	; print A
 	call putc
 .noprint:
-	ld hl, $DF81
-	ld a, [hl]
-	add 1
-	ld [hl], a
-	ld c, $51
-	ld [c], a
+	ld a, [$DF81]
+	inc a
+	ld [$DF81], a
+	ld [$FF51], a
 
 	POP HL
 	POP DE
@@ -94,7 +247,7 @@ memtest:
 	ld hl,memteststr
 	call puts
 	
-	ld hl, $C001		; Write loop
+	ld hl, $C000		; Write loop
 .wr:
 	ld a,h
 	xor l
@@ -106,7 +259,7 @@ memtest:
 	cp $80
 	jr nz, .wr
 
-	ld hl, $C001		; Read loop
+	ld hl, $C000		; Read loop
 .rd:
 	ld a,h
 	xor l
@@ -127,7 +280,7 @@ memtest:
 	ret
 .memfail:			; Say we failed (sadface)
 	; decrement hl the easy way
-	ld a,[hld]
+	dec [hl]
 	push hl
 	ld hl, failatstr
 	call puts
@@ -180,8 +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
@@ -324,14 +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:
@@ -340,3 +493,4 @@ puts:
 	ret z
 	call putc
 	jr puts
+