A little sanity checker.

[uccvend-snackrom.git] / ROM2 / chime.c

diff --git a/ROM2/chime.c b/ROM2/chime.c
index e959c1a..cf641e8 100644 (file)
--- a/ROM2/chime.c
+++ b/ROM2/chime.c
@@ -1,7 +1,7 @@
 #include "vend.h"
 #include "chime.h"
 
-u8 chime_count;
+volatile u8 chime_count;
 
 void chime() {
        /* called from the RTI interrupt, sees if we need to turn the chime on or
@@ -9,7 +9,7 @@ void chime() {
         */
        if (chime_count) {
                chime_on();
-               --chime_count;
+               --chime_count; /* interrupts masked here, so this won't result in badness */
        } else
                chime_off();
 }