X-Git-Url: http://git.joshuawise.com/fpgaboy.git/blobdiff_plain/5bac4cf0a60acac6826eb3215e1526d48ba8f7ac..ee31adcb22c5011aeaaa0149ee22fa18e45317a5:/diag.asm

diff --git a/diag.asm b/diag.asm
index 68ea3f8..e9fff6a 100644
--- a/diag.asm
+++ b/diag.asm
@@ -1,44 +1,247 @@
-	SECTION "a",HOME
+	section "end",HOME[1024]
+	nop
+
+	SECTION "a",HOME[$00]
+
+start: jp main
+	
+	section "vbl",HOME[$40]
+	jp vbl
+	
+	section "lcdc",HOME[$48]
+	jp lcdc
+	
+	section "tmro",HOME[$50]
+	jp tmro
 
 main:
-	ld c, $51	; Note that we are alive.
 	ld a, $FF
-	ld [c],a
-	
+	ld c, $51
+	ld [c], 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
+	ld [hli], a
+	
 	ld hl, signon
 	call puts
 
+	call putscreen
+	
+	ei
+
 	call memtest
 
 	call insntest
 
 	call waitsw
+	
+	di
 
 	jr 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:
+	; 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, $FF43
+	dec [hl]
+	ret	
+	
+
+lcdc:
+	PUSH AF
+	PUSH BC
+	
+	xor a
+	ld [$FF0F], a
+	
+	POP BC
+	POP AF
+	
+	reti
+	
+tmro:
+	PUSH AF
+	PUSH BC
+	PUSH DE
+	PUSH HL
+	
+	xor a
+	ld [$FF0F], a
+	
+	ld c, $45	; LYC
+	ld a, [c]
+	inc a
+	ld [c], a
+	
+	ld a, [$DF82]
+	cp 0
+	jr z, .noprint
+	ld a, $41	; print A
+	call putc
+.noprint:
+	ld a, [$DF81]
+	inc a
+	ld [$DF81], a
+	ld [$FF51], a
+
+	POP HL
+	POP DE
+	POP BC
+	POP AF
+	RETI
+
 ; Memory tester: writes h ^ l to all addresses from C000 to DF80.
 memtest:
 	ld hl,memteststr
 	call puts
 	
-	ld hl, $C001		; Write loop
+	ld hl, $C000		; Write loop
 .wr:
 	ld a,h
 	xor l
 	ld [hli],a
-	ld a, $DF
-	cp h
+	ld a, h
+	cp $DF
 	jr nz, .wr
-	ld a, $80
-	cp l
+	ld a, l
+	cp $80
 	jr nz, .wr
 
-	ld hl, $C001		; Read loop
+	ld hl, $C000		; Read loop
 .rd:
 	ld a,h
 	xor l
@@ -47,11 +250,11 @@ memtest:
 	cp b
 	jr nz, .memfail
 	
-	ld a, $DF
-	cp h
+	ld a, h
+	cp $DF
 	jr nz, .rd
-	ld a, $80
-	cp l
+	ld a, l
+	cp $80
 	jr nz, .rd
 	
 	ld hl, testokstr	; Say we're OK
@@ -59,7 +262,7 @@ memtest:
 	ret
 .memfail:			; Say we failed (sadface)
 	; decrement hl the easy way
-	ld a,[hld]
+	dec [hl]
 	push hl
 	ld hl, failatstr
 	call puts
@@ -86,16 +289,12 @@ puthex:				; Put two hex nibbles to the serial console.
 	rra
 	rra
 	rra
-	ld b,$0F
-	and b
-	ld b,$30
-	add b
+	and $0F
+	add $30
 	call putc
 	pop af
-	ld b,$0F
-	and b
-	ld b,$30
-	add b
+	and $0F
+	add $30
 	call putc
 	ret
 
@@ -103,19 +302,22 @@ puthex:				; Put two hex nibbles to the serial console.
 waitsw:
 	ld hl,waitswstr
 	call puts
+	
+	ld hl,$DF82
+	ld a, 1
+	ld [hl], a
 
 	ld c, $51
 	xor a
 	ld [c],a
 	
-	ld b, $0
 .loop1:
 	ld a,[c]
-	cp b
+	cp $0
 	jr z,.loop1
 .loop2:
 	ld a,[c]
-	cp b
+	cp $0
 	jr nz,.loop2
 	ret
 
@@ -159,8 +361,7 @@ insntest:
 
 	; Test JR
 	ld a, $FF
-	ld b, $00
-	cp b
+	cp $0
 	jr nz,.jr
 	ld hl, .jrfail
 	jr .fail
@@ -182,26 +383,49 @@ insntest:
 	; Test CP.
 	ld hl, .cpfail
 	ld a, $10
-	ld b, $20
-	cp b
+	cp $20
 	jr nc,.fail
 	ld a, $20
-	ld b, $10
-	cp b
+	cp $10
 	jr c,.fail
 	
 	; Test CPL
 	ld hl, .cplfail
 	ld a, $55
-	ld b, $AA
 	cpl
-	cp b
+	cp $AA
 	jr nz,.fail
+
+	; Test DI/EI delay
+	di
+	ld hl, .dinocausefail
+	ld c, $0F	; First, wait until an interrupt happens...
+.wait:	ld a, [c]
+	and $04
+	cp 0
+	jr z, .wait
+	ei		; Now make sure that an IRQ didn't happen on EI/DI
+	di
+	ld a, [c]
+	and $04
+	cp 0
+	jr z, .fail
+	ld hl, .dicausefail
+	ei		; Make sure that an IRQ does happen on EI/NOP/DI
+	nop
+	nop
+	di
+	ld a, [c]
+	and $04
+	cp 0
+	jr nz, .fail
+	ei
 	
 	ld hl, .ok
 	call puts
 	ret
 .fail:
+	ei
 	call puts
 	ld hl, .testfailed
 	call puts
@@ -224,6 +448,10 @@ insntest:
 	db "CPL",0
 .inc16fail:
 	db "INC16",0
+.dinocausefail:
+	db "DI/EI does not cause interrupt",0
+.dicausefail:
+	db "DI/NOP/EI cause interrupt",0
 .testfailed:
 	db " test failed.",$0D,$0A,0
 .ok:
@@ -231,12 +459,11 @@ insntest:
 
 ; Serial port manipulation functions.
 putc:
-	ld b, 0
 	ld c, $50
 	push af
 .waitport:
 	ld a,[c]
-	cp b
+	cp $00
 	jr nz,.waitport
 	pop af
 	ld [c],a
@@ -244,8 +471,8 @@ putc:
 
 puts:
 	ld a, [hli]
-	ld b, $00
-	cp b
+	cp $00
 	ret z
 	call putc
 	jr puts
+