Index: firmware/App/Services/FPGA.c
===================================================================
diff -u -rd5060b07988d9f64c3d5cad0fda25f209d23022b -r1af686275f4fd6a11bb3507f9f128eef9636edae
--- firmware/App/Services/FPGA.c	(.../FPGA.c)	(revision d5060b07988d9f64c3d5cad0fda25f209d23022b)
+++ firmware/App/Services/FPGA.c	(.../FPGA.c)	(revision 1af686275f4fd6a11bb3507f9f128eef9636edae)
@@ -82,10 +82,15 @@
 #define FPGA_AIRTRAP_LEVEL_LOW_MASK     0x0008                  ///< Bit mask for air trap lower level sensor.
 #define FPGA_AIRTRAP_LEVEL_HIGH_MASK    0x0004                  ///< Bit mask for air trap upper level sensor.
 
-#define FPGA_FLUIDLEAK_STATE_MASK       0x0040                  ///< Bit mask for fluid leak detector.
+#define FPGA_FLUID_LEAK_STATE_MASK      0x0040                  ///< Bit mask for fluid leak detector.
+#define FPGA_BLOOD_LEAK_STATUS_MASK     0x1000                  ///< Bit mask for blood leak detector.
+#define FPGA_BLOOD_LEAK_ZERO_STATE_MASK 0x2000                  ///< Bit mask for blood leak detector zero.
+
+#define FPGA_BLOOD_LEAK_ZERO_CMD        0x02                    ///< Bit for blood leak detector zero command.
+#define FPGA_BLOOD_LEAK_SELF_TEST_CMD   0x01                    ///< Bit for blood leak detector self test command.
+
 #define FPGA_ADA_INPUT_STATUS_MASK      0x0001                  ///< Bit mask for arterial air bubble detector input status.
 #define FPGA_ADV_INPUT_STATUS_MASK      0x0002                  ///< Bit mask for venous air bubble detector input status.
-#define FPGA_BLOOD_LEAK_STATUS_MASK     0x1000                  ///< Bit mask for blood leak detector status.
 
 #define FPGA_PBO_TEMP_DIVISOR           2047.0                  ///< Used in conversion of PBo temperature reading to deg C.
 #define FPGA_PBO_TEMP_GAIN              200.0                   ///< Used in conversion of PBo temperature reading to deg C.
@@ -1845,34 +1850,6 @@
 
 /*********************************************************************//**
  * @brief
- * The setFPGASensorTest function sets the sensor test output.
- * @details Inputs: fpgaActuatorSetPoints
- * @details Outputs: fpgaActuatorSetPoints
- * @param sensorTest
- * @return none
- *************************************************************************/
-void setFPGASensorTest( U08 sensorTest )
-{
-    fpgaActuatorSetPoints.fpgaSensorTest = sensorTest;
-}
-
-/*********************************************************************//**
- * @brief
- * The getFPGABloodLeakDetectorStatus function gets the latest blood leak
- * detector status.
- * @details Inputs: fpgaSensorReadings
- * @details Outputs: none
- * @return TRUE if blood leak is detected, otherwise FALSE
- *************************************************************************/
-BOOL getFPGABloodLeakDetectorStatus( void )
-{
-    U16 const status = fpgaSensorReadings.fpgaGPIO & FPGA_BLOOD_LEAK_STATUS_MASK;
-
-    return ( 0 == status ? FALSE : TRUE );
-}
-
-/*********************************************************************//**
- * @brief
  * The getDoorState function gets the current state of door switch.
  * @details Inputs: none
  * @details Outputs: none
@@ -1913,21 +1890,103 @@
 
 /*********************************************************************//**
  * @brief
- * The noFluidLeakDetected function returns TRUE if no fluid leak has been
+ * The noFPGAFluidLeakDetected function returns TRUE if no fluid leak has been
  * detected (dry) and FALSE if a fluid leak has been detected (wet).
  * @details Inputs: fpgaSensorReadings
  * @details Outputs: none
- * @return noFluidLeakDetected
+ * @return noFPGAFluidLeakDetected
  *************************************************************************/
 BOOL noFPGAFluidLeakDetected( void )
 {
-    U16 noFluidLeakDetected = fpgaSensorReadings.fpgaGPIO & FPGA_FLUIDLEAK_STATE_MASK;
+    U16 noFPGAFluidLeakDetected = fpgaSensorReadings.fpgaGPIO & FPGA_FLUID_LEAK_STATE_MASK;
 
-    return ( 0 == noFluidLeakDetected ? FALSE : TRUE );
+    return ( 0 == noFPGAFluidLeakDetected ? FALSE : TRUE );
 }
 
 /*********************************************************************//**
  * @brief
+ * The noFPGABloodLeakDetected function returns TRUE if no blood leak has been
+ * detected and FALSE if a blood leak has been detected.
+ * @details Inputs: fpgaSensorReadings
+ * @details Outputs: none
+ * @return noFPGABloodLeakDetected
+ *************************************************************************/
+BOOL noFPGABloodLeakDetected( void )
+{
+    U16 noFPGABloodLeakDetected = fpgaSensorReadings.fpgaGPIO & FPGA_BLOOD_LEAK_STATUS_MASK;
+
+    return ( 0 == noFPGABloodLeakDetected ? TRUE : FALSE );
+}
+
+/*********************************************************************//**
+ * @brief
+ * The FPGABloodLeakZeroDetected function returns TRUE if blood leak zeroing has
+ * been detected and FALSE if no blood leak zeroing has been detected.
+ * @details Inputs: fpgaSensorReadings
+ * @details Outputs: none
+ * @return FPGABloodLeakZeroDetected
+ *************************************************************************/
+BOOL FPGABloodLeakZeroDetected( void )
+{
+    U16 FPGABloodLeakZeroDetected = fpgaSensorReadings.fpgaGPIO & FPGA_BLOOD_LEAK_ZERO_STATE_MASK;
+
+    return ( 0 == FPGABloodLeakZeroDetected ? FALSE : TRUE );
+}
+
+/*********************************************************************//**
+ * @brief
+ * The setFPGABloodLeakZero function sets the Blood Leak detector into
+ * zeroing mode via the FPGA.
+ * @details Inputs: fpgaSensorReadings
+ * @details Outputs: none
+ * @return FPGABloodLeakZeroDetected
+ *************************************************************************/
+void setFPGABloodLeakZero( void )
+{
+    fpgaActuatorSetPoints.fpgaSensorTest |= FPGA_BLOOD_LEAK_ZERO_CMD;
+}
+
+/*********************************************************************//**
+ * @brief
+ * The clearFPGABloodLeakZero function clears the Blood Leak detector from
+ * zeroing mode via the FPGA.
+ * @details Inputs: fpgaSensorReadings
+ * @details Outputs: none
+ * @return none
+ *************************************************************************/
+void clearFPGABloodLeakZero( void )
+{
+    fpgaActuatorSetPoints.fpgaSensorTest &= ~FPGA_BLOOD_LEAK_ZERO_CMD;
+}
+
+/*********************************************************************//**
+ * @brief
+ * The setFPGABloodLeakSelfTest function sets the Blood Leak detector into
+ * self-test mode via the FPGA.
+ * @details Inputs: fpgaSensorReadings
+ * @details Outputs: none
+ * @return FPGABloodLeakZeroDetected
+ *************************************************************************/
+void setFPGABloodLeakSelfTest( void )
+{
+    fpgaActuatorSetPoints.fpgaSensorTest |= FPGA_BLOOD_LEAK_SELF_TEST_CMD;
+}
+
+/*********************************************************************//**
+ * @brief
+ * The clearFPGABloodLeakSelfTest function clears the Blood Leak detector from
+ * self-test mode via the FPGA.
+ * @details Inputs: fpgaSensorReadings
+ * @details Outputs: none
+ * @return none
+ *************************************************************************/
+void clearFPGABloodLeakSelfTest( void )
+{
+    fpgaActuatorSetPoints.fpgaSensorTest &= ~FPGA_BLOOD_LEAK_SELF_TEST_CMD;
+}
+
+/*********************************************************************//**
+ * @brief
  * The setValveDialyzerInletPosition function sets the position of VDi
  * in counts
  * @details Inputs: fpgaActuatorSetPoints