X-Git-Url: https://oss.titaniummirror.com/gitweb/?a=blobdiff_plain;f=tmr.h;fp=tmr.h;h=e985e1cfc0aff31be6d4e57510d4c452e3f4d37d;hb=63426eb2c3d465e0099bf425e7552457abfb867b;hp=a204ab000675ed0f362c26465e95c3cc010c0d21;hpb=a3982b963fd174f5d267e88ad97388f1697f6f83;p=rgblamp.git

diff --git a/tmr.h b/tmr.h
index a204ab0..e985e1c 100644
--- a/tmr.h
+++ b/tmr.h
@@ -98,8 +98,8 @@ void tmr_isr();
 /* Wait for c clocks, 0 <= c < 128. */
 #define tmr_cwait(c) \
   do { \
-    unsigned t0 = TMR0; \
-    while (TMR0 - t0 <= c); \
+    unsigned char t0 = TMR0; \
+    while ((unsigned char)(TMR0 - t0) <= c); \
   } while (0)
 
 /* Wait for a number of us.  This is pretty accurate. */