make sure clocktick starts at zero

2015-07-16 16:54:40 +02:00
parent 21d7729ad1
commit d229d51be5
2 changed files with 23 additions and 13 deletions
--- a/libsrc/pce/clock.s
+++ b/libsrc/pce/clock.s
@@ -2,20 +2,30 @@
 ; clock_t clock (void);
 ;

-        .include "pce.inc"
+                .include "pce.inc"

-        .export         _clock
-        .importzp       sreg
-;;        .importzp       tickcount
+                .export         _clock
+                .importzp       sreg
+;;                .importzp       tickcount

 .proc   _clock

-        lda tickcount+3
-        sta sreg+1
-        lda tickcount+2
-        sta sreg
-        ldx tickcount+1
-        lda tickcount
-        rts
+                lda     tickcount+3
+                sta     sreg+1
+                lda     tickcount+2
+                sta     sreg
+                ldx     tickcount+1
+                lda     tickcount
+                rts

 .endproc
+
+                .constructor initclock, 24
+
+initclock:
+                lda     #0
+                ldx     #3
+@lp:            sta     tickcount,x
+                dex
+                bpl     @lp
+                rts