X-Git-Url: http://git.joshuawise.com/fpgaboy.git/blobdiff_plain/5bac4cf0a60acac6826eb3215e1526d48ba8f7ac..f2b745a710572fd5cb2b1cf97d1d05a9b74d4fe1:/diag.asm

diff --git a/diag.asm b/diag.asm
index 68ea3f8..786052e 100644
--- a/diag.asm
+++ b/diag.asm
@@ -7,20 +7,63 @@ main:
 	
 	ld sp, $DFF0
 	
+	ld c, $07
+	ld a, $04	;start timer, 4.096KHz
+	ld [c], a
+
+	ld hl, $DF81
+	xor a
+	ld [hli], a
+	ld [hli], a
+	
 	ld hl, signon
 	call puts
+	
+	ei
 
 	call memtest
 
 	call insntest
 
 	call waitsw
+	
+	di
 
 	jr main
 
 signon:
 	db $0D,$0A,$1B,"[1mFPGABoy Diagnostic ROM",$1B,"[0m",$0D,$0A,0
 
+	section "fuq",HOME[$100]
+irqhand:
+	PUSH AF
+	PUSH BC
+	PUSH DE
+	PUSH HL
+	
+	xor a
+	ld c, $0F	; ack the irq
+	ld [c], a
+	
+	ld hl, $DF82
+	ld a, [hld]
+	cp 0
+	jr z, .noprint
+	ld a, $41	; print A
+	call putc
+.noprint:
+	ld a, [hl]
+	add 1
+	ld c, $51
+	ld [c], a
+	ld [hl], 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
@@ -31,11 +74,11 @@ memtest:
 	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
@@ -47,11 +90,11 @@ 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
@@ -86,16 +129,12 @@ 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 +142,22 @@ 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 +201,7 @@ insntest:
 
 	; Test JR
 	ld a, $FF
-	ld b, $00
-	cp b
+	cp $0
 	jr nz,.jr
 	ld hl, .jrfail
 	jr .fail
@@ -182,20 +223,17 @@ 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
 	
 	ld hl, .ok
@@ -231,12 +269,11 @@ 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 +281,7 @@ putc:
 
 puts:
 	ld a, [hli]
-	ld b, $00
-	cp b
+	cp $00
 	ret z
 	call putc
 	jr puts