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diff timer.s16 @ 25:fb14515266f4

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Implemented timer and timer interrupts. Added get/setvbr instructions. Fixed assembler bug. Moved mnemonics into a separate source file
author Michael Pavone <pavone@retrodev.com>
date Thu, 31 Mar 2016 23:25:52 -0700
parents
children cb078b3b23e8
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--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/timer.s16	Thu Mar 31 23:25:52 2016 -0700
@@ -0,0 +1,32 @@
+	ldim vectors, r0
+	setvbr r0
+	;current color value
+	ldim 0, r0
+	;color increment
+	ldim $11, r3
+	ldimh $1, r3
+	;Palette RAM address
+	ldim 0, r1
+	ldimh $FF, r1
+	;enable interrupt
+	ori 1, sr
+	;Timer Value
+	ldim $FF, r2
+	ldimh $FF, r2
+	outi $A, r2
+wait
+	bra wait
+	;shouldn't get here, disable timer so it's clear something broke
+	ldim 0, r2
+	outi $A, r2
+	bra wait
+
+vectors:
+	dc.w timer_handler
+	
+timer_handler
+	outi $E, r1
+	outi $F, r0
+	add r3, r0, r0
+	reti r4
+	
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