added interruptor support

2015-09-19 15:55:43 +02:00
parent 859604407b
commit 296489ba6c
8 changed files with 80 additions and 41 deletions
--- a/libsrc/pce/ticktock.s
+++ b/libsrc/pce/ticktock.s
@@ -0,0 +1,18 @@
+        .interruptor    ticktock, 24
+
+        .include        "pce.inc"
+        .include        "extzp.inc"
+
+ticktock:
+        bbr5    vdc_flags,@s1   ; not vertical-blank interrupt
+
+        ; Increment the system tick counter.
+        inc     tickcount
+        bne     @s1
+        inc     tickcount+1
+        bne     @s1
+        inc     tickcount+2
+        bne     @s1
+        inc     tickcount+3
+
+@s1:    rts