Test interrupts. They work!

[fpgaboy.git] / rom.asm

diff --git a/rom.asm b/rom.asm
index 2e98e136fb592519941823a6fa3a865d96b54f0d..437f01e5c5e036687992cf8a7ea646588eb7695d 100644 (file)
--- a/rom.asm
+++ b/rom.asm
@@ -4,20 +4,43 @@ main:
        ld c, $51       ; Note that we are alive.
        ld a, $FF
        ld [c],a
-
+       
        ld sp, $DFFF
 
        ld hl, signon
        call puts
+
+       ld c, $07
+       ld a, $04       ;start timer, 4.096KHz
+       ld [c], a
+       ei
        
        call memtest
 
        call insntest
 
        call waitsw
+       di
 
        jr main
 
+       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 a, $41       ; print A
+       call putc
+       POP HL
+       POP DE
+       POP BC
+       POP AF
+       RETI
+
 signon:
        db $0D,$0A,$1B,"[1mFPGABoy Diagnostic ROM",$1B,"[0m",$0D,$0A,0
 
@@ -103,12 +126,11 @@ puthex:                           ; Put two hex nibbles to the serial console.
 waitsw:
        ld hl,waitswstr
        call puts
-       
+
        ld c, $51
-       ld a, $00
+       xor a
        ld [c],a
        
-       ld c, $51
        ld b, $0
 .loop1:
        ld a,[c]
@@ -121,7 +143,7 @@ waitsw:
        ret
 
 waitswstr:
-       db "Diagnostic ROM complete; flip switches to nonzero and then to zero to reset.",$0D,$0A,0
+       db "Diagnostic ROM complete; flip switches to nonzero and then to zero to reset. Expect A.",$0D,$0A,0
 
 ; Core instruction basic acceptance tests.
 insntest:
@@ -232,9 +254,9 @@ insntest:
 
 ; Serial port manipulation functions.
 putc:
-       push af
        ld b, 0
        ld c, $50
+       push af
 .waitport:
        ld a,[c]
        cp b
@@ -247,6 +269,8 @@ puts:
        ld a, [hli]
        ld b, $00
        cp b
-       ret z
+       jr z, .done
        call putc
        jr puts
+.done:
+       ret