Index: firmware/App/Controllers/BloodFlow.c
===================================================================
diff -u -rc9cf3c88d4db4ddeb62c85489bbcb25e48688c35 -rc9cb494c004e390155ce7c8b3cda96cf8c1b5fa7
--- firmware/App/Controllers/BloodFlow.c	(.../BloodFlow.c)	(revision c9cf3c88d4db4ddeb62c85489bbcb25e48688c35)
+++ firmware/App/Controllers/BloodFlow.c	(.../BloodFlow.c)	(revision c9cb494c004e390155ce7c8b3cda96cf8c1b5fa7)
@@ -935,8 +935,8 @@
     if ( ++bpMotorSpeedCalcTimerCtr >= BP_SPEED_CALC_INTERVAL )
     {
         U16 bpMotorHallSensorCount = getFPGABloodPumpHallSensorCount();
-        U16 incDelta = ( bpMotorHallSensorCount >= bpLastMotorHallSensorCount ? bpMotorHallSensorCount - bpLastMotorHallSensorCount : ( 0x10000 - bpLastMotorHallSensorCount ) + bpMotorHallSensorCount );
-        U16 decDelta = 0x10000 - incDelta;
+        U16 incDelta = ( bpMotorHallSensorCount >= bpLastMotorHallSensorCount ? bpMotorHallSensorCount - bpLastMotorHallSensorCount : ( HEX_64_K - bpLastMotorHallSensorCount ) + bpMotorHallSensorCount );
+        U16 decDelta = HEX_64_K - incDelta;
         U16 delta;
 
         // determine blood pump speed/direction from delta hall sensor count since last interval