Index: firmware/App/Drivers/PeristalticPump.c
===================================================================
diff -u -rbd37ce75271151436de0bb6de9f75123d8251396 -rab35376c6b8ff81a4aa4095eb6c9bd33e1bf46d4
--- firmware/App/Drivers/PeristalticPump.c	(.../PeristalticPump.c)	(revision bd37ce75271151436de0bb6de9f75123d8251396)
+++ firmware/App/Drivers/PeristalticPump.c	(.../PeristalticPump.c)	(revision ab35376c6b8ff81a4aa4095eb6c9bd33e1bf46d4)
@@ -33,6 +33,7 @@
 #define BP_HZ_TO_RPM_SCALAR     10.0F                                       ///< Blood pump Hz to RPM scalar.
 #define BP_PERIOD_TO_HZ(p)      ( 1.0F / (F32)((S32)(p) * BP_PERIOD_SEC) )  ///< Blood pump period to Hz conversion macro.
 #define BP_HZ_TO_RPM(h)         ((h) * BP_HZ_TO_RPM_SCALAR)                 ///< Blood pump Hz to RPM conversion macro.
+#define BP_ZERO_SPEED_PERIOD    0xFFFF                                      ///< Blood pump period reported when pump is stopped.
 
 // ********** private data **********
 
@@ -82,13 +83,20 @@
     F32 rpm    = BP_HZ_TO_RPM(Hz);
 
     // update measured pump speed
-    if ( pumpSetSpeedRPM < 0 )
+    if ( period != BP_ZERO_SPEED_PERIOD )
     {
-        pumpMeasSpeedRPM.data = rpm * -1.0F;
+        if ( pumpSetSpeedRPM < 0 )
+        {
+            pumpMeasSpeedRPM.data = rpm * -1.0F;
+        }
+        else
+        {
+            pumpMeasSpeedRPM.data = rpm;
+        }
     }
     else
     {
-        pumpMeasSpeedRPM.data = rpm;
+        pumpMeasSpeedRPM.data = 0.0F;
     }
 
     // clear home command if previously requested