X-Git-Url: http://git.joshuawise.com/fpgaboy.git/blobdiff_plain/f888201b9894683abfff012bd68b641319fb2744..f9000d73c8971e2e6323122efb06bcfd846b5d62:/diag.asm

diff --git a/diag.asm b/diag.asm
index 28fce99..55127f8 100644
--- a/diag.asm
+++ b/diag.asm
@@ -13,7 +13,8 @@ main:
 
 	ld hl, $DF81
 	xor a
-	ld [hl], a
+	ld [hli], a
+	ld [hli], a
 	
 	ld hl, signon
 	call puts
@@ -44,15 +45,17 @@ irqhand:
 	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
-	
-	ld hl, $DF81
+.noprint:
+	inc [hl]
 	ld a, [hl]
-	add 1
 	ld c, $51
 	ld [c], a
-	ld [hl], a
 
 	POP HL
 	POP DE
@@ -138,6 +141,10 @@ 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
@@ -227,11 +234,32 @@ insntest:
 	cpl
 	cp $AA
 	jr nz,.fail
+
+	; Test DI/EI delay
+	di
+	ld hl, .difail
+	ld c, $0F	; First, wait until an interrupt happens...
+.wait:	ld a, [c]
+	cp 0
+	jr z, .wait
+	ei		; Now make sure that an IRQ didn't happen on EI/DI
+	di
+	ld a, [c]
+	cp 0
+	jr z, .fail
+	ei		; Make sure that an IRQ does happen on EI/NOP/DI
+	nop
+	di
+	ld a, [c]
+	cp 0
+	jr nz, .fail
+	ei
 	
 	ld hl, .ok
 	call puts
 	ret
 .fail:
+	ei
 	call puts
 	ld hl, .testfailed
 	call puts
@@ -254,6 +282,8 @@ insntest:
 	db "CPL",0
 .inc16fail:
 	db "INC16",0
+.difail:
+	db "DI/EI delay",0
 .testfailed:
 	db " test failed.",$0D,$0A,0
 .ok: