diff --git a/Downstream/.cproject b/Downstream/.cproject
index a64ae34..1f23b55 100644
--- a/Downstream/.cproject
+++ b/Downstream/.cproject
@@ -45,7 +45,7 @@
 							<option id="ilg.gnuarmeclipse.managedbuild.cross.option.warnings.logicalop.1966851850" name="Warn if suspicious logical ops (-Wlogical-op)" superClass="ilg.gnuarmeclipse.managedbuild.cross.option.warnings.logicalop" value="true" valueType="boolean"/>
 							<option id="ilg.gnuarmeclipse.managedbuild.cross.option.warnings.pointerarith.1529172556" name="Warn if pointer arithmetic (-Wpointer-arith)" superClass="ilg.gnuarmeclipse.managedbuild.cross.option.warnings.pointerarith" value="true" valueType="boolean"/>
 							<targetPlatform archList="all" binaryParser="org.eclipse.cdt.core.ELF" id="ilg.gnuarmeclipse.managedbuild.cross.targetPlatform.1042769951" isAbstract="false" osList="all" superClass="ilg.gnuarmeclipse.managedbuild.cross.targetPlatform"/>
-							<builder autoBuildTarget="all" buildPath="${workspace_loc:/Downstream}/Debug" cleanBuildTarget="clean" command="${cross_make}" id="org.eclipse.cdt.build.core.internal.builder.1804403788" incrementalBuildTarget="all" keepEnvironmentInBuildfile="false" managedBuildOn="true" name="CDT Internal Builder" superClass="org.eclipse.cdt.build.core.internal.builder"/>
+							<builder autoBuildTarget="all" buildPath="${workspace_loc:/Downstream}/Debug" cleanBuildTarget="clean" command="${cross_make}" id="org.eclipse.cdt.build.core.internal.builder.1804403788" incrementalBuildTarget="all" keepEnvironmentInBuildfile="false" managedBuildOn="true" name="CDT Internal Builder" parallelBuildOn="true" parallelizationNumber="optimal" superClass="org.eclipse.cdt.build.core.internal.builder"/>
 							<tool id="ilg.gnuarmeclipse.managedbuild.cross.tool.assembler.789837881" name="Cross ARM GNU Assembler" superClass="ilg.gnuarmeclipse.managedbuild.cross.tool.assembler">
 								<option id="ilg.gnuarmeclipse.managedbuild.cross.option.assembler.usepreprocessor.1524992420" name="Use preprocessor" superClass="ilg.gnuarmeclipse.managedbuild.cross.option.assembler.usepreprocessor" value="true" valueType="boolean"/>
 								<option id="ilg.gnuarmeclipse.managedbuild.cross.option.assembler.defs.559716966" name="Defined symbols (-D)" superClass="ilg.gnuarmeclipse.managedbuild.cross.option.assembler.defs" valueType="definedSymbols">
@@ -167,7 +167,7 @@
 							<option id="ilg.gnuarmeclipse.managedbuild.cross.option.warnings.pointerarith.1192110404" name="Warn if pointer arithmetic (-Wpointer-arith)" superClass="ilg.gnuarmeclipse.managedbuild.cross.option.warnings.pointerarith" value="true" valueType="boolean"/>
 							<option id="ilg.gnuarmeclipse.managedbuild.cross.option.warnings.logicalop.322411367" name="Warn if suspicious logical ops (-Wlogical-op)" superClass="ilg.gnuarmeclipse.managedbuild.cross.option.warnings.logicalop" value="true" valueType="boolean"/>
 							<targetPlatform archList="all" binaryParser="org.eclipse.cdt.core.ELF" id="ilg.gnuarmeclipse.managedbuild.cross.targetPlatform.777514892" isAbstract="false" osList="all" superClass="ilg.gnuarmeclipse.managedbuild.cross.targetPlatform"/>
-							<builder autoBuildTarget="all" buildPath="${workspace_loc:/Downstream}/Release" cleanBuildTarget="clean" command="${cross_make}" id="org.eclipse.cdt.build.core.internal.builder.1921336679" incrementalBuildTarget="all" keepEnvironmentInBuildfile="false" managedBuildOn="true" name="CDT Internal Builder" superClass="org.eclipse.cdt.build.core.internal.builder"/>
+							<builder autoBuildTarget="all" buildPath="${workspace_loc:/Downstream}/Release" cleanBuildTarget="clean" command="${cross_make}" id="org.eclipse.cdt.build.core.internal.builder.1921336679" incrementalBuildTarget="all" keepEnvironmentInBuildfile="false" managedBuildOn="true" name="CDT Internal Builder" parallelBuildOn="true" parallelizationNumber="optimal" superClass="org.eclipse.cdt.build.core.internal.builder"/>
 							<tool id="ilg.gnuarmeclipse.managedbuild.cross.tool.assembler.314526004" name="Cross ARM GNU Assembler" superClass="ilg.gnuarmeclipse.managedbuild.cross.tool.assembler">
 								<option id="ilg.gnuarmeclipse.managedbuild.cross.option.assembler.usepreprocessor.2143421487" name="Use preprocessor" superClass="ilg.gnuarmeclipse.managedbuild.cross.option.assembler.usepreprocessor" value="true" valueType="boolean"/>
 								<option id="ilg.gnuarmeclipse.managedbuild.cross.option.assembler.defs.1659712048" name="Defined symbols (-D)" superClass="ilg.gnuarmeclipse.managedbuild.cross.option.assembler.defs" valueType="definedSymbols">
diff --git a/Downstream/Inc/downstream_interface_def.h b/Downstream/Inc/downstream_interface_def.h
index a5cdf56..57ebfcf 100644
--- a/Downstream/Inc/downstream_interface_def.h
+++ b/Downstream/Inc/downstream_interface_def.h
@@ -57,7 +57,7 @@ InterfaceCommandMscTypeDef;
 
 typedef enum
 {
-    COMMAND_HID_REPORT,               //Downstream initiates HID report transfer to Upstream. Upstream just needs to Upstream_ReceivePacket each time.
+    COMMAND_HID_REPORT,               //Returns HID report
 }
 InterfaceCommandHidTypeDef;
 
diff --git a/Downstream/Inc/downstream_statemachine.h b/Downstream/Inc/downstream_statemachine.h
index fbd5874..6e86311 100644
--- a/Downstream/Inc/downstream_statemachine.h
+++ b/Downstream/Inc/downstream_statemachine.h
@@ -33,7 +33,7 @@ typedef enum
     do {                                                \
         USB_Host_Disconnect();                          \
         LED_Fault_SetBlinkRate(LED_FAST_BLINK_RATE);    \
-        DownstreamState = STATE_ERROR;                  \
+        /*DownstreamState = STATE_ERROR;   */               \
         while (1);                                      \
 } while (0);
 
diff --git a/Downstream/Middlewares/ST/STM32_USB_Host_Library/Class/HID/Src/usbh_hid.c b/Downstream/Middlewares/ST/STM32_USB_Host_Library/Class/HID/Src/usbh_hid.c
index be36dfa..19e6bea 100644
--- a/Downstream/Middlewares/ST/STM32_USB_Host_Library/Class/HID/Src/usbh_hid.c
+++ b/Downstream/Middlewares/ST/STM32_USB_Host_Library/Class/HID/Src/usbh_hid.c
@@ -394,7 +394,7 @@ static USBH_StatusTypeDef USBH_HID_Process(USBH_HandleTypeDef *phost)
 
     if (urbStatus == USBH_URB_NOTREADY)
     {
-        HID_Handle->state = HID_IDLE;
+        HID_Handle->state = HID_GET_DATA;
         break;
     }
 
@@ -404,7 +404,7 @@ static USBH_StatusTypeDef USBH_HID_Process(USBH_HandleTypeDef *phost)
       if(USBH_ClrFeature(phost,
                          HID_Handle->ep_addr) == USBH_OK)
       {
-        HID_Handle->state = HID_IDLE;
+        HID_Handle->state = HID_GET_DATA;
       }
     }
     break;
diff --git a/Downstream/Src/downstream_hid.c b/Downstream/Src/downstream_hid.c
index b941663..9dd42dd 100644
--- a/Downstream/Src/downstream_hid.c
+++ b/Downstream/Src/downstream_hid.c
@@ -74,8 +74,7 @@ void Downstream_HID_InterruptReportCallback(DownstreamPacketTypeDef* packetToSen
         return;
     }
 
-
-    Downstream_TransmitPacket(packetToSend);
+    Downstream_PacketProcessor_ClassReply(packetToSend);
 }
 
 
diff --git a/Upstream/Inc/upstream_hid.h b/Upstream/Inc/upstream_hid.h
index c3c0d03..9bc5de7 100644
--- a/Upstream/Inc/upstream_hid.h
+++ b/Upstream/Inc/upstream_hid.h
@@ -15,9 +15,7 @@
 
 
 
-//#include "usbd_def.h"
 #include "stm32f4xx_hal.h"
-#include "upstream_interface_def.h"
 
 
 typedef uint8_t (*UpstreamHidSendReportCallback)(uint8_t *report,
@@ -25,9 +23,8 @@ typedef uint8_t (*UpstreamHidSendReportCallback)(uint8_t *report,
 
 
 
-void Upstream_HID_Init(InterfaceCommandClassTypeDef newClass);
 void Upstream_HID_DeInit(void);
-void Upstream_HID_GetNextReport(UpstreamHidSendReportCallback callback);
+HAL_StatusTypeDef Upstream_HID_GetNextReport(UpstreamHidSendReportCallback callback);
 
 
 
diff --git a/Upstream/Inc/upstream_interface_def.h b/Upstream/Inc/upstream_interface_def.h
index 9f00626..f122887 100644
--- a/Upstream/Inc/upstream_interface_def.h
+++ b/Upstream/Inc/upstream_interface_def.h
@@ -59,7 +59,7 @@ InterfaceCommandMscTypeDef;
 
 typedef enum
 {
-    COMMAND_HID_REPORT,               //Downstream initiates HID report transfer to Upstream. Upstream just needs to Upstream_ReceivePacket each time.
+    COMMAND_HID_REPORT,				//Returns HID report
 }
 InterfaceCommandHidTypeDef;
 
diff --git a/Upstream/Inc/upstream_spi.h b/Upstream/Inc/upstream_spi.h
index b96e00c..7e180c2 100644
--- a/Upstream/Inc/upstream_spi.h
+++ b/Upstream/Inc/upstream_spi.h
@@ -87,8 +87,7 @@ HAL_StatusTypeDef Upstream_ReceivePacket(SpiPacketReceivedCallbackTypeDef callba
 void Upstream_TxOkInterrupt(void);
 void HAL_SPI_TxRxCpltCallback(SPI_HandleTypeDef *hspi);
 void HAL_SPI_ErrorCallback(SPI_HandleTypeDef *hspi);
-void Upstream_SetExpectedReceivedCommand(uint8_t expectedCommandClass,
-                                         uint8_t expectedCommand);
+
 
 
 #endif /* INC_UPSTREAM_SPI_H_ */
diff --git a/Upstream/Inc/upstream_statemachine.h b/Upstream/Inc/upstream_statemachine.h
index c199e66..99b4802 100644
--- a/Upstream/Inc/upstream_statemachine.h
+++ b/Upstream/Inc/upstream_statemachine.h
@@ -14,6 +14,7 @@
 
 
 #include "led.h"
+#include "upstream_interface_def.h"
 
 
 typedef enum
@@ -37,7 +38,7 @@ typedef enum
 
 void Upstream_InitStateMachine(void);
 void Upstream_StateMachine_SetErrorState(void);
-HAL_StatusTypeDef Upstream_StateMachine_CheckClassOperationOk(void);
+InterfaceCommandClassTypeDef Upstream_StateMachine_CheckActiveClass(void);
 void Upstream_StateMachine_DeviceDisconnected(void);
 
 
diff --git a/Upstream/Src/upstream_hid.c b/Upstream/Src/upstream_hid.c
index 2de79ad..56212d6 100644
--- a/Upstream/Src/upstream_hid.c
+++ b/Upstream/Src/upstream_hid.c
@@ -21,7 +21,6 @@
 
 
 
-InterfaceCommandClassTypeDef    ActiveHidClass    = COMMAND_CLASS_INTERFACE;
 UpstreamPacketTypeDef*          UpstreamHidPacket = NULL;
 UpstreamHidSendReportCallback   ReportCallback    = NULL;
 
@@ -31,28 +30,8 @@ void Upstream_HID_GetNextReportReceiveCallback(UpstreamPacketTypeDef* receivedPa
 
 
 
-void Upstream_HID_Init(InterfaceCommandClassTypeDef newClass)
-{
-    if ((newClass != COMMAND_CLASS_HID_MOUSE))          //add classes here
-    {
-        UPSTREAM_SPI_FREAKOUT;
-        return;
-    }
-
-    if ((ActiveHidClass != COMMAND_CLASS_INTERFACE) ||
-        (UpstreamHidPacket != NULL))
-    {
-        UPSTREAM_SPI_FREAKOUT;
-        return;
-    }
-
-    ActiveHidClass = newClass;
-}
-
-
 void Upstream_HID_DeInit(void)
 {
-    ActiveHidClass = COMMAND_CLASS_INTERFACE;
     if (UpstreamHidPacket != NULL)
     {
         Upstream_ReleasePacket(UpstreamHidPacket);
@@ -61,12 +40,17 @@ void Upstream_HID_DeInit(void)
 }
 
 
-void Upstream_HID_GetNextReport(UpstreamHidSendReportCallback callback)
+
+HAL_StatusTypeDef Upstream_HID_GetNextReport(UpstreamHidSendReportCallback callback)
 {
-    if ((ActiveHidClass != COMMAND_CLASS_HID_MOUSE))      //add classes here
+	UpstreamPacketTypeDef* freePacket;
+	InterfaceCommandClassTypeDef activeClass;
+
+	activeClass = Upstream_StateMachine_CheckActiveClass();
+    if ((activeClass != COMMAND_CLASS_HID_MOUSE))      //add classes here
     {
-        UPSTREAM_SPI_FREAKOUT;
-        return;
+        UPSTREAM_STATEMACHINE_FREAKOUT;
+        return HAL_ERROR;
     }
 
     //Release packet used for last transaction (if any)
@@ -78,23 +62,47 @@ void Upstream_HID_GetNextReport(UpstreamHidSendReportCallback callback)
 
     if (ReportCallback != NULL)
     {
-        UPSTREAM_SPI_FREAKOUT;
-        return;
+        UPSTREAM_STATEMACHINE_FREAKOUT;
+        return HAL_ERROR;
     }
     ReportCallback = callback;
 
-    //Get next packet
-    Upstream_SetExpectedReceivedCommand(ActiveHidClass, COMMAND_HID_REPORT);
-    Upstream_ReceivePacket(Upstream_HID_GetNextReportReceiveCallback);
+    freePacket = Upstream_GetFreePacketImmediately();
+    if (freePacket == NULL)
+    {
+        return HAL_ERROR;
+    }
+
+	freePacket->Length16 = UPSTREAM_PACKET_HEADER_LEN_16;
+	freePacket->CommandClass = activeClass;
+	freePacket->Command = COMMAND_HID_REPORT;
+
+	if (Upstream_TransmitPacket(freePacket) == HAL_OK)
+	{
+		return Upstream_ReceivePacket(Upstream_HID_GetNextReportReceiveCallback);
+	}
+
+	//else:
+	Upstream_ReleasePacket(freePacket);
+	return HAL_ERROR;
 }
 
 
+
 void Upstream_HID_GetNextReportReceiveCallback(UpstreamPacketTypeDef* receivedPacket)
 {
     UpstreamHidSendReportCallback tempReportCallback;
+	InterfaceCommandClassTypeDef activeClass;
     uint8_t dataLength = 0;
     uint8_t i;
 
+	activeClass = Upstream_StateMachine_CheckActiveClass();
+    if ((activeClass != COMMAND_CLASS_HID_MOUSE))      //add classes here
+    {
+        UPSTREAM_STATEMACHINE_FREAKOUT;
+        return;
+    }
+
     if ((UpstreamHidPacket != NULL) ||
         (ReportCallback == NULL))
     {
@@ -108,7 +116,7 @@ void Upstream_HID_GetNextReportReceiveCallback(UpstreamPacketTypeDef* receivedPa
     }
 
 
-    if (ActiveHidClass == COMMAND_CLASS_HID_MOUSE)
+    if (activeClass == COMMAND_CLASS_HID_MOUSE)
     {
         if (receivedPacket->Length16 != (UPSTREAM_PACKET_HEADER_LEN_16 + ((HID_MOUSE_DATA_LEN + 1) / 2)))
         {
diff --git a/Upstream/Src/upstream_msc.c b/Upstream/Src/upstream_msc.c
index dd35959..515ee3e 100644
--- a/Upstream/Src/upstream_msc.c
+++ b/Upstream/Src/upstream_msc.c
@@ -41,8 +41,9 @@ static void Upstream_MSC_BeginWriteReplyCallback(UpstreamPacketTypeDef* replyPac
 
 HAL_StatusTypeDef Upstream_MSC_TestReady(UpstreamMSCCallbackTypeDef callback)
 {
-    if (Upstream_StateMachine_CheckClassOperationOk() != HAL_OK)
+    if (Upstream_StateMachine_CheckActiveClass() != COMMAND_CLASS_MASS_STORAGE)
     {
+    	//UPSTREAM_STATEMACHINE_FREAKOUT;
         return HAL_ERROR;
     }
     
@@ -60,7 +61,7 @@ void Upstream_MSC_TestReadyFreePacketCallback(UpstreamPacketTypeDef* freePacket)
 
     if (Upstream_TransmitPacket(freePacket) == HAL_OK)
     {
-        Upstream_ReleasePacket(freePacket);
+        Upstream_ReleasePacket(freePacket);					/////////!!!!!!!!!!!!!???????????
         if (Upstream_ReceivePacket(Upstream_MSC_TestReadyReplyCallback) != HAL_OK)
         {
             TestReadyCallback(HAL_ERROR);
@@ -77,7 +78,7 @@ void Upstream_MSC_TestReadyFreePacketCallback(UpstreamPacketTypeDef* freePacket)
 
 void Upstream_MSC_TestReadyReplyCallback(UpstreamPacketTypeDef* replyPacket)
 {
-    if (Upstream_StateMachine_CheckClassOperationOk() != HAL_OK)
+    if (Upstream_StateMachine_CheckActiveClass() != COMMAND_CLASS_MASS_STORAGE)
     {
         return;
     }
@@ -89,7 +90,7 @@ void Upstream_MSC_TestReadyReplyCallback(UpstreamPacketTypeDef* replyPacket)
     }
 
     if ((replyPacket->Length16 != (UPSTREAM_PACKET_HEADER_LEN_16 + 1)) ||
-        (replyPacket->Data[0] != HAL_OK))
+        (replyPacket->Data[0]  != HAL_OK))
     {
         Upstream_ReleasePacket(replyPacket);
         TestReadyCallback(HAL_ERROR);
@@ -106,7 +107,7 @@ HAL_StatusTypeDef Upstream_MSC_GetCapacity(UpstreamMSCCallbackUintPacketTypeDef
 {
     UpstreamPacketTypeDef* freePacket;
 
-    if (Upstream_StateMachine_CheckClassOperationOk() != HAL_OK)
+    if (Upstream_StateMachine_CheckActiveClass() != COMMAND_CLASS_MASS_STORAGE)
     {
         return HAL_ERROR;
     }
@@ -126,6 +127,7 @@ HAL_StatusTypeDef Upstream_MSC_GetCapacity(UpstreamMSCCallbackUintPacketTypeDef
         return Upstream_ReceivePacket(Upstream_MSC_GetCapacityReplyCallback);
     }
     //else:
+    Upstream_ReleasePacket(freePacket); ////////?????????
     return HAL_ERROR;
 }
 
@@ -135,7 +137,7 @@ void Upstream_MSC_GetCapacityReplyCallback(UpstreamPacketTypeDef* replyPacket)
     uint32_t uint1;
     uint32_t uint2;
 
-    if (Upstream_StateMachine_CheckClassOperationOk() != HAL_OK)
+    if (Upstream_StateMachine_CheckActiveClass() != COMMAND_CLASS_MASS_STORAGE)
     {
         return;
     }
@@ -164,7 +166,7 @@ HAL_StatusTypeDef Upstream_MSC_BeginRead(UpstreamMSCCallbackTypeDef callback,
                                          uint32_t readBlockCount,
                                          uint32_t readByteCount)
 {
-    if (Upstream_StateMachine_CheckClassOperationOk() != HAL_OK)
+    if (Upstream_StateMachine_CheckActiveClass() != COMMAND_CLASS_MASS_STORAGE)
     {
         return HAL_ERROR;
     }
@@ -207,7 +209,7 @@ void Upstream_MSC_BeginReadFreePacketCallback(UpstreamPacketTypeDef* freePacket)
 
 HAL_StatusTypeDef Upstream_MSC_GetStreamDataPacket(UpstreamMSCCallbackPacketTypeDef callback)
 {
-    if (Upstream_StateMachine_CheckClassOperationOk() != HAL_OK)
+    if (Upstream_StateMachine_CheckActiveClass() != COMMAND_CLASS_MASS_STORAGE)
     {
         return HAL_ERROR;
     }
@@ -236,7 +238,7 @@ void Upstream_MSC_GetStreamDataPacketCallback(UpstreamPacketTypeDef* replyPacket
 
     ReadStreamBusy = 0;
 
-    if (Upstream_StateMachine_CheckClassOperationOk() != HAL_OK)
+    if (Upstream_StateMachine_CheckActiveClass() != COMMAND_CLASS_MASS_STORAGE)
     {
         return;
     }
@@ -256,7 +258,7 @@ void Upstream_MSC_GetStreamDataPacketCallback(UpstreamPacketTypeDef* replyPacket
     dataLength8 = (replyPacket->Length16 - UPSTREAM_PACKET_HEADER_LEN_16) * 2;
 
     if (((replyPacket->CommandClass & COMMAND_CLASS_DATA_FLAG) == 0) ||     //Any 'command' reply (as opposed to 'data' reply) is an automatic fail here
-         (replyPacket->Length16 <= UPSTREAM_PACKET_HEADER_LEN_16) ||            //Should be at least one data byte in the reply.
+         (replyPacket->Length16 <= UPSTREAM_PACKET_HEADER_LEN_16) ||        //Should be at least one data byte in the reply.
          (dataLength8 > ByteCount))                                         //No more data than expected transfer length
     {
         GetStreamDataCallback(NULL, 0);
@@ -277,7 +279,7 @@ HAL_StatusTypeDef Upstream_MSC_BeginWrite(UpstreamMSCCallbackTypeDef callback,
                                           uint64_t writeBlockStart,
                                           uint32_t writeBlockCount)
 {
-    if (Upstream_StateMachine_CheckClassOperationOk() != HAL_OK)
+    if (Upstream_StateMachine_CheckActiveClass() != COMMAND_CLASS_MASS_STORAGE)
     {
         return HAL_ERROR;
     }
@@ -318,7 +320,7 @@ void Upstream_MSC_BeginWriteReplyCallback(UpstreamPacketTypeDef* replyPacket)
 {
     uint8_t tempResult;
 
-    if (Upstream_StateMachine_CheckClassOperationOk() != HAL_OK)
+    if (Upstream_StateMachine_CheckActiveClass() != COMMAND_CLASS_MASS_STORAGE)
     {
         return;
     }
@@ -347,7 +349,7 @@ void Upstream_MSC_BeginWriteReplyCallback(UpstreamPacketTypeDef* replyPacket)
 HAL_StatusTypeDef Upstream_MSC_PutStreamDataPacket(UpstreamPacketTypeDef* packetToSend,
                                                    uint32_t dataLength8)
 {
-    if (Upstream_StateMachine_CheckClassOperationOk() != HAL_OK)
+    if (Upstream_StateMachine_CheckActiveClass() != COMMAND_CLASS_MASS_STORAGE)
     {
         return HAL_ERROR;
     }
diff --git a/Upstream/Src/upstream_spi.c b/Upstream/Src/upstream_spi.c
index 25478cd..d3c1b42 100644
--- a/Upstream/Src/upstream_spi.c
+++ b/Upstream/Src/upstream_spi.c
@@ -540,12 +540,4 @@ void HAL_SPI_ErrorCallback(SPI_HandleTypeDef *hspi)
 }
 
 
-//Used by USB interface classes.
-//This is required when Downstream sends a packet without an initiating request from us
-void Upstream_SetExpectedReceivedCommand(uint8_t expectedCommandClass,
-                                         uint8_t expectedCommand)
-{
-    SentCommandClass = expectedCommandClass;
-    SentCommand = expectedCommand;
-}
 
diff --git a/Upstream/Src/upstream_statemachine.c b/Upstream/Src/upstream_statemachine.c
index d43b6c0..1002b53 100644
--- a/Upstream/Src/upstream_statemachine.c
+++ b/Upstream/Src/upstream_statemachine.c
@@ -12,7 +12,6 @@
 
 #include "upstream_statemachine.h"
 #include "upstream_spi.h"
-#include "upstream_interface_def.h"
 #include "usb_device.h"
 #include "usbd_core.h"
 #include "usbd_msc.h"
@@ -76,20 +75,20 @@ void Upstream_StateMachine_SetErrorState(void)
 }
 
 
-HAL_StatusTypeDef Upstream_StateMachine_CheckClassOperationOk(void)
+InterfaceCommandClassTypeDef Upstream_StateMachine_CheckActiveClass(void)
 {
     if (UpstreamState == STATE_ERROR)
     {
-        return HAL_ERROR;
+        return COMMAND_CLASS_ERROR;
     }
 
     if (UpstreamState != STATE_DEVICE_ACTIVE)
     {
         UPSTREAM_STATEMACHINE_FREAKOUT;
-        return HAL_ERROR;
+        return COMMAND_CLASS_INTERFACE;
     }
 
-    return HAL_OK;
+    return ConfiguredDeviceClass;
 }