Index: firmware/App/Services/FpgaDD.c
===================================================================
diff -u -r02c2059fd465609e56c6240d2855c91be2129fd6 -r3643a2e648ab2b216fd08579e56bdc02fb94836d
--- firmware/App/Services/FpgaDD.c	(.../FpgaDD.c)	(revision 02c2059fd465609e56c6240d2855c91be2129fd6)
+++ firmware/App/Services/FpgaDD.c	(.../FpgaDD.c)	(revision 3643a2e648ab2b216fd08579e56bdc02fb94836d)
@@ -1,7 +1,7 @@
 
 /**************************************************************************
 *
-* Copyright (c) 2024-2025 Diality Inc. - All Rights Reserved.
+* Copyright (c) 2024-2026 Diality Inc. - All Rights Reserved.
 *
 * THIS CODE MAY NOT BE COPIED OR REPRODUCED IN ANY FORM, IN PART OR IN
 * WHOLE, WITHOUT THE EXPLICIT PERMISSION OF THE COPYRIGHT OWNER.
@@ -234,7 +234,7 @@
     U16 flowRateP7;                             ///< Reg 704.  P7 flow sensor rate.
     U16 flowTempP7;                             ///< Reg 706.  P7 flow sensor temperature.
     U16 p12PumpTachCount;                       ///< Reg 708.  P12 pump tachometer counter.
-    U16 dsPumpTachCount;                        ///< Reg 710.  DSP tachometer counter.
+    U16 d79SpeedPulseWidth;                     ///< Reg 710.  D79 pusle width feedback.
     U16 flowIntTempP7;                          ///< Reg 712.  P7 flow sensor internal temperature.
     U08 valveIOControlReadback;                 ///< Reg 714.  IO Valve control bits read back.
     U08 valveFPControlReadback;                 ///< Reg 715.  FP Valve control enable read back.
@@ -295,7 +295,7 @@
     U08 fpgaD42FIFOTx;                          ///< Reg 48. Blood leak sensor FIFO transmit control
     U08 fpgaD5HeaterPWMControl;                 ///< Reg 49. Primary heater PWM control
     U08 fpgaD45HeaterPWMControl;                ///< Reg 50. Trimmer heater PWM control
-    U08 fpgaNotUsed;                            ///< Reg 51. Not used
+    U08 fpgaD79PWMPumpCtl;                      ///< Reg 51. Rinse pump PWM control
     U16 fpgaVBCPWMLow;                          ///< Reg 52. VBC PWM low ( Balancing chamber valves)
     U16 fpgaVBCPWMPeriod;                       ///< Reg 54. VBC PWM period
     U16 fpgaVBCPWMPullIn;                       ///< Reg 56. VBC PWM pull in
@@ -3105,6 +3105,45 @@
 
 /*********************************************************************//**
  * @brief
+ * The setFPGAD79RinsePumpControl function sets the control bit of the rinse
+ * pump to turn it on or off.
+ * @details \b Inputs: none
+ * @details \b Outputs: fpgaActuatorSetPoints.fpgaDDSpareValveControl
+ * @return none
+ *************************************************************************/
+void setFPGAD79RinsePumpControl( U08 value )
+{
+    fpgaActuatorSetPoints.fpgaDDSpareValveControl &= value;
+}
+
+/*********************************************************************//**
+ * @brief
+ * The setFPGAD79RinsePumpPWMControl function sets the PWM value of the rinse
+ * pump to turn it on or off.
+ * @details \b Inputs: none
+ * @details \b Outputs: fpgaActuatorSetPoints.fpgaD79PWMPumpCtl
+ * @return none
+ *************************************************************************/
+void setFPGAD79RinsePumpPWMControl( U08 value )
+{
+    fpgaActuatorSetPoints.fpgaD79PWMPumpCtl = value;
+}
+
+/*********************************************************************//**
+ * @brief
+ * The getFPGAD79RinsePumpPulseWidth function returns the 4-wire rinse pump
+ * pulse width.
+ * @details \b Inputs: d79SpeedPulseWidth
+ * @details \b Outputs: none
+ * @return fpgaSensorReadings.d79SpeedPulseWidth
+ *************************************************************************/
+U16 getFPGAD79RinsePumpPulseWidth( void )
+{
+    return fpgaSensorReadings.d79SpeedPulseWidth;
+}
+
+/*********************************************************************//**
+ * @brief
  * The setFPGAFPValveStates function sets the FP valve states with an 8-bit
  * mask of states - one bit per valve, with a 1 meaning "energized" and a 0
  * meaning "de-energized".  The bit positions for these bit states are as follows: