Fixed MassStorage based demos and projects resetting the SCSI sense values before the command is executed, leading to missed SCSI sense values when the host retrieves the sense key (thanks to Martin Degelsegger).

Added missing DataflashManager_CheckDataflashOperation() function to the MassStorageKeyboard demo, removed redundant SCSI_Codes.h file as these values are part of the MassStorage Class Driver.

6 files changed, 204 insertions, 95 deletions

diff --git a/Projects/Incomplete/StandaloneProgrammer/Lib/SCSI.c b/Projects/Incomplete/StandaloneProgrammer/Lib/SCSI.c
index 29f97491d..1ca22a50e 100644
--- a/Projects/Incomplete/StandaloneProgrammer/Lib/SCSI.c
+++ b/Projects/Incomplete/StandaloneProgrammer/Lib/SCSI.c
@@ -86,39 +86,39 @@ SCSI_Request_Sense_Response_t SenseData =
  *  a command failure due to a ILLEGAL REQUEST.
  *
  *  \param[in] MSInterfaceInfo  Pointer to the Mass Storage class interface structure that the command is associated with
+ *
+ *  \return Boolean true if the command completed successfully, false otherwise
  */
 bool SCSI_DecodeSCSICommand(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo)
 {
-	/* Set initial sense data, before the requested command is processed */
-	SCSI_SET_SENSE(SCSI_SENSE_KEY_GOOD,
-	               SCSI_ASENSE_NO_ADDITIONAL_INFORMATION,
-	               SCSI_ASENSEQ_NO_QUALIFIER);
-					   
+	bool CommandSuccess = false;
+
 	/* Run the appropriate SCSI command hander function based on the passed command */
 	switch (MSInterfaceInfo->State.CommandBlock.SCSICommandData[0])
 	{
 		case SCSI_CMD_INQUIRY:
-			SCSI_Command_Inquiry(MSInterfaceInfo);			
+			CommandSuccess = SCSI_Command_Inquiry(MSInterfaceInfo);			
 			break;
 		case SCSI_CMD_REQUEST_SENSE:
-			SCSI_Command_Request_Sense(MSInterfaceInfo);
+			CommandSuccess = SCSI_Command_Request_Sense(MSInterfaceInfo);
 			break;
 		case SCSI_CMD_READ_CAPACITY_10:
-			SCSI_Command_Read_Capacity_10(MSInterfaceInfo);			
+			CommandSuccess = SCSI_Command_Read_Capacity_10(MSInterfaceInfo);			
 			break;
 		case SCSI_CMD_SEND_DIAGNOSTIC:
-			SCSI_Command_Send_Diagnostic(MSInterfaceInfo);
+			CommandSuccess = SCSI_Command_Send_Diagnostic(MSInterfaceInfo);
 			break;
 		case SCSI_CMD_WRITE_10:
-			SCSI_Command_ReadWrite_10(MSInterfaceInfo, DATA_WRITE);
+			CommandSuccess = SCSI_Command_ReadWrite_10(MSInterfaceInfo, DATA_WRITE);
 			break;
 		case SCSI_CMD_READ_10:
-			SCSI_Command_ReadWrite_10(MSInterfaceInfo, DATA_READ);
+			CommandSuccess = SCSI_Command_ReadWrite_10(MSInterfaceInfo, DATA_READ);
 			break;
 		case SCSI_CMD_TEST_UNIT_READY:
 		case SCSI_CMD_PREVENT_ALLOW_MEDIUM_REMOVAL:
 		case SCSI_CMD_VERIFY_10:
 			/* These commands should just succeed, no handling required */
+			CommandSuccess = true;
 			MSInterfaceInfo->State.CommandBlock.DataTransferLength = 0;
 			break;
 		default:
@@ -129,15 +129,27 @@ bool SCSI_DecodeSCSICommand(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo)
 			break;
 	}
 
-	return (SenseData.SenseKey == SCSI_SENSE_KEY_GOOD);
+	/* Check if command was successfully processed */
+	if (CommandSuccess)
+	{
+		SCSI_SET_SENSE(SCSI_SENSE_KEY_GOOD,
+		               SCSI_ASENSE_NO_ADDITIONAL_INFORMATION,
+		               SCSI_ASENSEQ_NO_QUALIFIER);
+		
+		return true;
+	}
+
+	return false;
 }
 
 /** Command processing for an issued SCSI INQUIRY command. This command returns information about the device's features
  *  and capabilities to the host.
  *
  *  \param[in] MSInterfaceInfo  Pointer to the Mass Storage class interface structure that the command is associated with
+ *
+ *  \return Boolean true if the command completed successfully, false otherwise.
  */
-static void SCSI_Command_Inquiry(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo)
+static bool SCSI_Command_Inquiry(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo)
 {
 	uint16_t AllocationLength  = SwapEndian_16(*(uint16_t*)&MSInterfaceInfo->State.CommandBlock.SCSICommandData[3]);
 	uint16_t BytesTransferred  = (AllocationLength < sizeof(InquiryData))? AllocationLength :
@@ -152,7 +164,7 @@ static void SCSI_Command_Inquiry(USB_ClassInfo_MS_Device_t* const MSInterfaceInf
 		               SCSI_ASENSE_INVALID_FIELD_IN_CDB,
 		               SCSI_ASENSEQ_NO_QUALIFIER);
 
-		return;
+		return false;
 	}
 	
 	Endpoint_Write_Stream_LE(&InquiryData, BytesTransferred, NO_STREAM_CALLBACK);
@@ -167,14 +179,18 @@ static void SCSI_Command_Inquiry(USB_ClassInfo_MS_Device_t* const MSInterfaceInf
 
 	/* Succeed the command and update the bytes transferred counter */
 	MSInterfaceInfo->State.CommandBlock.DataTransferLength -= BytesTransferred;
+	
+	return true;
 }
 
 /** Command processing for an issued SCSI REQUEST SENSE command. This command returns information about the last issued command,
  *  including the error code and additional error information so that the host can determine why a command failed to complete.
  *
  *  \param[in] MSInterfaceInfo  Pointer to the Mass Storage class interface structure that the command is associated with
+ *
+ *  \return Boolean true if the command completed successfully, false otherwise.
  */
-static void SCSI_Command_Request_Sense(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo)
+static bool SCSI_Command_Request_Sense(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo)
 {
 	uint8_t  AllocationLength = MSInterfaceInfo->State.CommandBlock.SCSICommandData[4];
 	uint8_t  BytesTransferred = (AllocationLength < sizeof(SenseData))? AllocationLength : sizeof(SenseData);
@@ -187,14 +203,18 @@ static void SCSI_Command_Request_Sense(USB_ClassInfo_MS_Device_t* const MSInterf
 
 	/* Succeed the command and update the bytes transferred counter */
 	MSInterfaceInfo->State.CommandBlock.DataTransferLength -= BytesTransferred;
+
+	return true;
 }
 
 /** Command processing for an issued SCSI READ CAPACITY (10) command. This command returns information about the device's capacity
  *  on the selected Logical Unit (drive), as a number of OS-sized blocks.
  *
  *  \param[in] MSInterfaceInfo  Pointer to the Mass Storage class interface structure that the command is associated with
+ *
+ *  \return Boolean true if the command completed successfully, false otherwise.
  */
-static void SCSI_Command_Read_Capacity_10(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo)
+static bool SCSI_Command_Read_Capacity_10(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo)
 {
 	uint32_t LastBlockAddressInLUN = (VIRTUAL_MEMORY_BLOCKS - 1);
 	uint32_t MediaBlockSize        = VIRTUAL_MEMORY_BLOCK_SIZE;
@@ -205,6 +225,8 @@ static void SCSI_Command_Read_Capacity_10(USB_ClassInfo_MS_Device_t* const MSInt
 	
 	/* Succeed the command and update the bytes transferred counter */
 	MSInterfaceInfo->State.CommandBlock.DataTransferLength -= 8;
+	
+	return true;
 }
 
 /** Command processing for an issued SCSI SEND DIAGNOSTIC command. This command performs a quick check of the Dataflash ICs on the
@@ -212,8 +234,10 @@ static void SCSI_Command_Read_Capacity_10(USB_ClassInfo_MS_Device_t* const MSInt
  *  supported.
  *
  *  \param[in] MSInterfaceInfo  Pointer to the Mass Storage class interface structure that the command is associated with
+ *
+ *  \return Boolean true if the command completed successfully, false otherwise.
  */
-static void SCSI_Command_Send_Diagnostic(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo)
+static bool SCSI_Command_Send_Diagnostic(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo)
 {
 	/* Check to see if the SELF TEST bit is not set */
 	if (!(MSInterfaceInfo->State.CommandBlock.SCSICommandData[1] & (1 << 2)))
@@ -223,7 +247,7 @@ static void SCSI_Command_Send_Diagnostic(USB_ClassInfo_MS_Device_t* const MSInte
 		               SCSI_ASENSE_INVALID_FIELD_IN_CDB,
 		               SCSI_ASENSEQ_NO_QUALIFIER);
 
-		return;
+		return false;
 	}
 	
 	/* Check to see if all attached Dataflash ICs are functional */
@@ -234,11 +258,13 @@ static void SCSI_Command_Send_Diagnostic(USB_ClassInfo_MS_Device_t* const MSInte
 		               SCSI_ASENSE_NO_ADDITIONAL_INFORMATION,
 		               SCSI_ASENSEQ_NO_QUALIFIER);	
 	
-		return;
+		return false;
 	}
 	
 	/* Succeed the command and update the bytes transferred counter */
 	MSInterfaceInfo->State.CommandBlock.DataTransferLength = 0;
+	
+	return true;
 }
 
 /** Command processing for an issued SCSI READ (10) or WRITE (10) command. This command reads in the block start address
@@ -247,12 +273,20 @@ static void SCSI_Command_Send_Diagnostic(USB_ClassInfo_MS_Device_t* const MSInte
  *
  *  \param[in] MSInterfaceInfo  Pointer to the Mass Storage class interface structure that the command is associated with
  *  \param[in] IsDataRead  Indicates if the command is a READ (10) command or WRITE (10) command (DATA_READ or DATA_WRITE)
+ *
+ *  \return Boolean true if the command completed successfully, false otherwise.
  */
-static void SCSI_Command_ReadWrite_10(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo,
+static bool SCSI_Command_ReadWrite_10(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo,
                                       const bool IsDataRead)
 {
-	uint32_t BlockAddress = SwapEndian_32(*(uint32_t*)&MSInterfaceInfo->State.CommandBlock.SCSICommandData[2]);
-	uint16_t TotalBlocks  = SwapEndian_16(*(uint16_t*)&MSInterfaceInfo->State.CommandBlock.SCSICommandData[7]);
+	uint32_t BlockAddress;
+	uint16_t TotalBlocks;
+	
+	/* Load in the 32-bit block address (SCSI uses big-endian, so have to reverse the byte order) */
+	BlockAddress = SwapEndian_32(*(uint32_t*)&MSInterfaceInfo->State.CommandBlock.SCSICommandData[2]);
+
+	/* Load in the 16-bit total blocks (SCSI uses big-endian, so have to reverse the byte order) */
+	TotalBlocks  = SwapEndian_16(*(uint16_t*)&MSInterfaceInfo->State.CommandBlock.SCSICommandData[7]);
 	
 	/* Check if the block address is outside the maximum allowable value for the LUN */
 	if (BlockAddress >= VIRTUAL_MEMORY_BLOCKS)
@@ -262,7 +296,7 @@ static void SCSI_Command_ReadWrite_10(USB_ClassInfo_MS_Device_t* const MSInterfa
 		               SCSI_ASENSE_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE,
 		               SCSI_ASENSEQ_NO_QUALIFIER);
 
-		return;
+		return false;
 	}
 	
 	/* Determine if the packet is a READ (10) or WRITE (10) command, call appropriate function */
@@ -273,5 +307,7 @@ static void SCSI_Command_ReadWrite_10(USB_ClassInfo_MS_Device_t* const MSInterfa
 
 	/* Update the bytes transferred counter and succeed the command */
 	MSInterfaceInfo->State.CommandBlock.DataTransferLength -= ((uint32_t)TotalBlocks * VIRTUAL_MEMORY_BLOCK_SIZE);
+	
+	return true;
 }
 #endif
diff --git a/Projects/Incomplete/StandaloneProgrammer/Lib/SCSI.h b/Projects/Incomplete/StandaloneProgrammer/Lib/SCSI.h
index 22c3a1d44..6932a8152 100644
--- a/Projects/Incomplete/StandaloneProgrammer/Lib/SCSI.h
+++ b/Projects/Incomplete/StandaloneProgrammer/Lib/SCSI.h
@@ -43,6 +43,7 @@
 		#include <LUFA/Drivers/USB/USB.h>
 		#include <LUFA/Drivers/USB/Class/MassStorage.h>
 
+		#include "StandaloneProgrammer.h"
 		#include "Descriptors.h"
 		#include "DataflashManager.h"
 	
@@ -55,9 +56,9 @@
 		 *  \param[in] acode  New SCSI additional sense key to set the additional sense code to
 		 *  \param[in] aqual  New SCSI additional sense key qualifier to set the additional sense qualifier code to
 		 */
-		#define SCSI_SET_SENSE(key, acode, aqual)  MACROS{ SenseData.SenseKey = key;              \
-		                                                   SenseData.AdditionalSenseCode = acode; \
-		                                                   SenseData.AdditionalSenseQualifier = aqual; }MACROE
+		#define SCSI_SET_SENSE(Key, Acode, Aqual)  MACROS{ SenseData.SenseKey                 = (Key);   \
+		                                                   SenseData.AdditionalSenseCode      = (Acode); \
+		                                                   SenseData.AdditionalSenseQualifier = (Aqual); }MACROE
 
 		/** Macro for the \ref SCSI_Command_ReadWrite_10() function, to indicate that data is to be read from the storage medium. */
 		#define DATA_READ           true
@@ -76,12 +77,12 @@
 			bool SCSI_DecodeSCSICommand(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo);
 			
 			#if defined(INCLUDE_FROM_SCSI_C)
-				static void SCSI_Command_Inquiry(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo);
-				static void SCSI_Command_Request_Sense(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo);
-				static void SCSI_Command_Read_Capacity_10(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo);
-				static void SCSI_Command_Send_Diagnostic(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo);
-				static void SCSI_Command_ReadWrite_10(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo,
-				                                      const bool IsDataRead);
+				static bool SCSI_Command_Inquiry(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo);
+				static bool SCSI_Command_Request_Sense(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo);
+				static bool SCSI_Command_Read_Capacity_10(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo);
+				static bool SCSI_Command_Send_Diagnostic(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo);
+				static bool SCSI_Command_ReadWrite_10(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo,
+													  const bool IsDataRead);
 			#endif
 		#endif
 		
diff --git a/Projects/TempDataLogger/Lib/SCSI.c b/Projects/TempDataLogger/Lib/SCSI.c
index 6923f7819..a98731957 100644
--- a/Projects/TempDataLogger/Lib/SCSI.c
+++ b/Projects/TempDataLogger/Lib/SCSI.c
@@ -85,39 +85,39 @@ SCSI_Request_Sense_Response_t SenseData =
  *  a command failure due to a ILLEGAL REQUEST.
  *
  *  \param[in] MSInterfaceInfo  Pointer to the Mass Storage class interface structure that the command is associated with
+ *
+ *  \return Boolean true if the command completed successfully, false otherwise
  */
 bool SCSI_DecodeSCSICommand(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo)
 {
-	/* Set initial sense data, before the requested command is processed */
-	SCSI_SET_SENSE(SCSI_SENSE_KEY_GOOD,
-	               SCSI_ASENSE_NO_ADDITIONAL_INFORMATION,
-	               SCSI_ASENSEQ_NO_QUALIFIER);
-					   
+	bool CommandSuccess = false;
+
 	/* Run the appropriate SCSI command hander function based on the passed command */
 	switch (MSInterfaceInfo->State.CommandBlock.SCSICommandData[0])
 	{
 		case SCSI_CMD_INQUIRY:
-			SCSI_Command_Inquiry(MSInterfaceInfo);			
+			CommandSuccess = SCSI_Command_Inquiry(MSInterfaceInfo);			
 			break;
 		case SCSI_CMD_REQUEST_SENSE:
-			SCSI_Command_Request_Sense(MSInterfaceInfo);
+			CommandSuccess = SCSI_Command_Request_Sense(MSInterfaceInfo);
 			break;
 		case SCSI_CMD_READ_CAPACITY_10:
-			SCSI_Command_Read_Capacity_10(MSInterfaceInfo);			
+			CommandSuccess = SCSI_Command_Read_Capacity_10(MSInterfaceInfo);			
 			break;
 		case SCSI_CMD_SEND_DIAGNOSTIC:
-			SCSI_Command_Send_Diagnostic(MSInterfaceInfo);
+			CommandSuccess = SCSI_Command_Send_Diagnostic(MSInterfaceInfo);
 			break;
 		case SCSI_CMD_WRITE_10:
-			SCSI_Command_ReadWrite_10(MSInterfaceInfo, DATA_WRITE);
+			CommandSuccess = SCSI_Command_ReadWrite_10(MSInterfaceInfo, DATA_WRITE);
 			break;
 		case SCSI_CMD_READ_10:
-			SCSI_Command_ReadWrite_10(MSInterfaceInfo, DATA_READ);
+			CommandSuccess = SCSI_Command_ReadWrite_10(MSInterfaceInfo, DATA_READ);
 			break;
 		case SCSI_CMD_TEST_UNIT_READY:
 		case SCSI_CMD_PREVENT_ALLOW_MEDIUM_REMOVAL:
 		case SCSI_CMD_VERIFY_10:
 			/* These commands should just succeed, no handling required */
+			CommandSuccess = true;
 			MSInterfaceInfo->State.CommandBlock.DataTransferLength = 0;
 			break;
 		default:
@@ -128,15 +128,27 @@ bool SCSI_DecodeSCSICommand(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo)
 			break;
 	}
 
-	return (SenseData.SenseKey == SCSI_SENSE_KEY_GOOD);
+	/* Check if command was successfully processed */
+	if (CommandSuccess)
+	{
+		SCSI_SET_SENSE(SCSI_SENSE_KEY_GOOD,
+		               SCSI_ASENSE_NO_ADDITIONAL_INFORMATION,
+		               SCSI_ASENSEQ_NO_QUALIFIER);
+		
+		return true;
+	}
+
+	return false;
 }
 
 /** Command processing for an issued SCSI INQUIRY command. This command returns information about the device's features
  *  and capabilities to the host.
  *
  *  \param[in] MSInterfaceInfo  Pointer to the Mass Storage class interface structure that the command is associated with
+ *
+ *  \return Boolean true if the command completed successfully, false otherwise.
  */
-static void SCSI_Command_Inquiry(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo)
+static bool SCSI_Command_Inquiry(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo)
 {
 	uint16_t AllocationLength  = SwapEndian_16(*(uint16_t*)&MSInterfaceInfo->State.CommandBlock.SCSICommandData[3]);
 	uint16_t BytesTransferred  = (AllocationLength < sizeof(InquiryData))? AllocationLength :
@@ -151,7 +163,7 @@ static void SCSI_Command_Inquiry(USB_ClassInfo_MS_Device_t* const MSInterfaceInf
 		               SCSI_ASENSE_INVALID_FIELD_IN_CDB,
 		               SCSI_ASENSEQ_NO_QUALIFIER);
 
-		return;
+		return false;
 	}
 	
 	Endpoint_Write_Stream_LE(&InquiryData, BytesTransferred, NO_STREAM_CALLBACK);
@@ -166,14 +178,18 @@ static void SCSI_Command_Inquiry(USB_ClassInfo_MS_Device_t* const MSInterfaceInf
 
 	/* Succeed the command and update the bytes transferred counter */
 	MSInterfaceInfo->State.CommandBlock.DataTransferLength -= BytesTransferred;
+	
+	return true;
 }
 
 /** Command processing for an issued SCSI REQUEST SENSE command. This command returns information about the last issued command,
  *  including the error code and additional error information so that the host can determine why a command failed to complete.
  *
  *  \param[in] MSInterfaceInfo  Pointer to the Mass Storage class interface structure that the command is associated with
+ *
+ *  \return Boolean true if the command completed successfully, false otherwise.
  */
-static void SCSI_Command_Request_Sense(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo)
+static bool SCSI_Command_Request_Sense(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo)
 {
 	uint8_t  AllocationLength = MSInterfaceInfo->State.CommandBlock.SCSICommandData[4];
 	uint8_t  BytesTransferred = (AllocationLength < sizeof(SenseData))? AllocationLength : sizeof(SenseData);
@@ -186,14 +202,18 @@ static void SCSI_Command_Request_Sense(USB_ClassInfo_MS_Device_t* const MSInterf
 
 	/* Succeed the command and update the bytes transferred counter */
 	MSInterfaceInfo->State.CommandBlock.DataTransferLength -= BytesTransferred;
+
+	return true;
 }
 
 /** Command processing for an issued SCSI READ CAPACITY (10) command. This command returns information about the device's capacity
  *  on the selected Logical Unit (drive), as a number of OS-sized blocks.
  *
  *  \param[in] MSInterfaceInfo  Pointer to the Mass Storage class interface structure that the command is associated with
+ *
+ *  \return Boolean true if the command completed successfully, false otherwise.
  */
-static void SCSI_Command_Read_Capacity_10(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo)
+static bool SCSI_Command_Read_Capacity_10(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo)
 {
 	uint32_t LastBlockAddressInLUN = (VIRTUAL_MEMORY_BLOCKS - 1);
 	uint32_t MediaBlockSize        = VIRTUAL_MEMORY_BLOCK_SIZE;
@@ -204,6 +224,8 @@ static void SCSI_Command_Read_Capacity_10(USB_ClassInfo_MS_Device_t* const MSInt
 	
 	/* Succeed the command and update the bytes transferred counter */
 	MSInterfaceInfo->State.CommandBlock.DataTransferLength -= 8;
+	
+	return true;
 }
 
 /** Command processing for an issued SCSI SEND DIAGNOSTIC command. This command performs a quick check of the Dataflash ICs on the
@@ -211,8 +233,10 @@ static void SCSI_Command_Read_Capacity_10(USB_ClassInfo_MS_Device_t* const MSInt
  *  supported.
  *
  *  \param[in] MSInterfaceInfo  Pointer to the Mass Storage class interface structure that the command is associated with
+ *
+ *  \return Boolean true if the command completed successfully, false otherwise.
  */
-static void SCSI_Command_Send_Diagnostic(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo)
+static bool SCSI_Command_Send_Diagnostic(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo)
 {
 	/* Check to see if the SELF TEST bit is not set */
 	if (!(MSInterfaceInfo->State.CommandBlock.SCSICommandData[1] & (1 << 2)))
@@ -222,7 +246,7 @@ static void SCSI_Command_Send_Diagnostic(USB_ClassInfo_MS_Device_t* const MSInte
 		               SCSI_ASENSE_INVALID_FIELD_IN_CDB,
 		               SCSI_ASENSEQ_NO_QUALIFIER);
 
-		return;
+		return false;
 	}
 	
 	/* Check to see if all attached Dataflash ICs are functional */
@@ -233,11 +257,13 @@ static void SCSI_Command_Send_Diagnostic(USB_ClassInfo_MS_Device_t* const MSInte
 		               SCSI_ASENSE_NO_ADDITIONAL_INFORMATION,
 		               SCSI_ASENSEQ_NO_QUALIFIER);	
 	
-		return;
+		return false;
 	}
 	
 	/* Succeed the command and update the bytes transferred counter */
 	MSInterfaceInfo->State.CommandBlock.DataTransferLength = 0;
+	
+	return true;
 }
 
 /** Command processing for an issued SCSI READ (10) or WRITE (10) command. This command reads in the block start address
@@ -246,13 +272,21 @@ static void SCSI_Command_Send_Diagnostic(USB_ClassInfo_MS_Device_t* const MSInte
  *
  *  \param[in] MSInterfaceInfo  Pointer to the Mass Storage class interface structure that the command is associated with
  *  \param[in] IsDataRead  Indicates if the command is a READ (10) command or WRITE (10) command (DATA_READ or DATA_WRITE)
+ *
+ *  \return Boolean true if the command completed successfully, false otherwise.
  */
-static void SCSI_Command_ReadWrite_10(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo,
+static bool SCSI_Command_ReadWrite_10(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo,
                                       const bool IsDataRead)
 {
-	uint32_t BlockAddress = SwapEndian_32(*(uint32_t*)&MSInterfaceInfo->State.CommandBlock.SCSICommandData[2]);
-	uint16_t TotalBlocks  = SwapEndian_16(*(uint16_t*)&MSInterfaceInfo->State.CommandBlock.SCSICommandData[7]);
-		
+	uint32_t BlockAddress;
+	uint16_t TotalBlocks;
+	
+	/* Load in the 32-bit block address (SCSI uses big-endian, so have to reverse the byte order) */
+	BlockAddress = SwapEndian_32(*(uint32_t*)&MSInterfaceInfo->State.CommandBlock.SCSICommandData[2]);
+
+	/* Load in the 16-bit total blocks (SCSI uses big-endian, so have to reverse the byte order) */
+	TotalBlocks  = SwapEndian_16(*(uint16_t*)&MSInterfaceInfo->State.CommandBlock.SCSICommandData[7]);
+	
 	/* Check if the block address is outside the maximum allowable value for the LUN */
 	if (BlockAddress >= VIRTUAL_MEMORY_BLOCKS)
 	{
@@ -261,7 +295,7 @@ static void SCSI_Command_ReadWrite_10(USB_ClassInfo_MS_Device_t* const MSInterfa
 		               SCSI_ASENSE_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE,
 		               SCSI_ASENSEQ_NO_QUALIFIER);
 
-		return;
+		return false;
 	}
 	
 	/* Determine if the packet is a READ (10) or WRITE (10) command, call appropriate function */
@@ -272,4 +306,6 @@ static void SCSI_Command_ReadWrite_10(USB_ClassInfo_MS_Device_t* const MSInterfa
 
 	/* Update the bytes transferred counter and succeed the command */
 	MSInterfaceInfo->State.CommandBlock.DataTransferLength -= ((uint32_t)TotalBlocks * VIRTUAL_MEMORY_BLOCK_SIZE);
+	
+	return true;
 }
diff --git a/Projects/TempDataLogger/Lib/SCSI.h b/Projects/TempDataLogger/Lib/SCSI.h
index c5504b713..5c2112b2c 100644
--- a/Projects/TempDataLogger/Lib/SCSI.h
+++ b/Projects/TempDataLogger/Lib/SCSI.h
@@ -56,9 +56,9 @@
 		 *  \param[in] acode  New SCSI additional sense key to set the additional sense code to
 		 *  \param[in] aqual  New SCSI additional sense key qualifier to set the additional sense qualifier code to
 		 */
-		#define SCSI_SET_SENSE(key, acode, aqual)  MACROS{ SenseData.SenseKey = (key);                   \
-		                                                   SenseData.AdditionalSenseCode = (acode);      \
-		                                                   SenseData.AdditionalSenseQualifier = (aqual); }MACROE
+		#define SCSI_SET_SENSE(Key, Acode, Aqual)  MACROS{ SenseData.SenseKey                 = (Key);   \
+		                                                   SenseData.AdditionalSenseCode      = (Acode); \
+		                                                   SenseData.AdditionalSenseQualifier = (Aqual); }MACROE
 
 		/** Macro for the \ref SCSI_Command_ReadWrite_10() function, to indicate that data is to be read from the storage medium. */
 		#define DATA_READ           true
@@ -76,11 +76,11 @@
 		bool SCSI_DecodeSCSICommand(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo);
 		
 		#if defined(INCLUDE_FROM_SCSI_C)
-			static void SCSI_Command_Inquiry(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo);
-			static void SCSI_Command_Request_Sense(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo);
-			static void SCSI_Command_Read_Capacity_10(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo);
-			static void SCSI_Command_Send_Diagnostic(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo);
-			static void SCSI_Command_ReadWrite_10(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo,
+			static bool SCSI_Command_Inquiry(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo);
+			static bool SCSI_Command_Request_Sense(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo);
+			static bool SCSI_Command_Read_Capacity_10(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo);
+			static bool SCSI_Command_Send_Diagnostic(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo);
+			static bool SCSI_Command_ReadWrite_10(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo,
 			                                      const bool IsDataRead);
 		#endif
 		
diff --git a/Projects/Webserver/Lib/SCSI.c b/Projects/Webserver/Lib/SCSI.c
index 8999fabb0..a98731957 100644
--- a/Projects/Webserver/Lib/SCSI.c
+++ b/Projects/Webserver/Lib/SCSI.c
@@ -85,39 +85,39 @@ SCSI_Request_Sense_Response_t SenseData =
  *  a command failure due to a ILLEGAL REQUEST.
  *
  *  \param[in] MSInterfaceInfo  Pointer to the Mass Storage class interface structure that the command is associated with
+ *
+ *  \return Boolean true if the command completed successfully, false otherwise
  */
 bool SCSI_DecodeSCSICommand(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo)
 {
-	/* Set initial sense data, before the requested command is processed */
-	SCSI_SET_SENSE(SCSI_SENSE_KEY_GOOD,
-	               SCSI_ASENSE_NO_ADDITIONAL_INFORMATION,
-	               SCSI_ASENSEQ_NO_QUALIFIER);
-					   
+	bool CommandSuccess = false;
+
 	/* Run the appropriate SCSI command hander function based on the passed command */
 	switch (MSInterfaceInfo->State.CommandBlock.SCSICommandData[0])
 	{
 		case SCSI_CMD_INQUIRY:
-			SCSI_Command_Inquiry(MSInterfaceInfo);			
+			CommandSuccess = SCSI_Command_Inquiry(MSInterfaceInfo);			
 			break;
 		case SCSI_CMD_REQUEST_SENSE:
-			SCSI_Command_Request_Sense(MSInterfaceInfo);
+			CommandSuccess = SCSI_Command_Request_Sense(MSInterfaceInfo);
 			break;
 		case SCSI_CMD_READ_CAPACITY_10:
-			SCSI_Command_Read_Capacity_10(MSInterfaceInfo);			
+			CommandSuccess = SCSI_Command_Read_Capacity_10(MSInterfaceInfo);			
 			break;
 		case SCSI_CMD_SEND_DIAGNOSTIC:
-			SCSI_Command_Send_Diagnostic(MSInterfaceInfo);
+			CommandSuccess = SCSI_Command_Send_Diagnostic(MSInterfaceInfo);
 			break;
 		case SCSI_CMD_WRITE_10:
-			SCSI_Command_ReadWrite_10(MSInterfaceInfo, DATA_WRITE);
+			CommandSuccess = SCSI_Command_ReadWrite_10(MSInterfaceInfo, DATA_WRITE);
 			break;
 		case SCSI_CMD_READ_10:
-			SCSI_Command_ReadWrite_10(MSInterfaceInfo, DATA_READ);
+			CommandSuccess = SCSI_Command_ReadWrite_10(MSInterfaceInfo, DATA_READ);
 			break;
 		case SCSI_CMD_TEST_UNIT_READY:
 		case SCSI_CMD_PREVENT_ALLOW_MEDIUM_REMOVAL:
 		case SCSI_CMD_VERIFY_10:
 			/* These commands should just succeed, no handling required */
+			CommandSuccess = true;
 			MSInterfaceInfo->State.CommandBlock.DataTransferLength = 0;
 			break;
 		default:
@@ -128,15 +128,27 @@ bool SCSI_DecodeSCSICommand(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo)
 			break;
 	}
 
-	return (SenseData.SenseKey == SCSI_SENSE_KEY_GOOD);
+	/* Check if command was successfully processed */
+	if (CommandSuccess)
+	{
+		SCSI_SET_SENSE(SCSI_SENSE_KEY_GOOD,
+		               SCSI_ASENSE_NO_ADDITIONAL_INFORMATION,
+		               SCSI_ASENSEQ_NO_QUALIFIER);
+		
+		return true;
+	}
+
+	return false;
 }
 
 /** Command processing for an issued SCSI INQUIRY command. This command returns information about the device's features
  *  and capabilities to the host.
  *
  *  \param[in] MSInterfaceInfo  Pointer to the Mass Storage class interface structure that the command is associated with
+ *
+ *  \return Boolean true if the command completed successfully, false otherwise.
  */
-static void SCSI_Command_Inquiry(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo)
+static bool SCSI_Command_Inquiry(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo)
 {
 	uint16_t AllocationLength  = SwapEndian_16(*(uint16_t*)&MSInterfaceInfo->State.CommandBlock.SCSICommandData[3]);
 	uint16_t BytesTransferred  = (AllocationLength < sizeof(InquiryData))? AllocationLength :
@@ -151,7 +163,7 @@ static void SCSI_Command_Inquiry(USB_ClassInfo_MS_Device_t* const MSInterfaceInf
 		               SCSI_ASENSE_INVALID_FIELD_IN_CDB,
 		               SCSI_ASENSEQ_NO_QUALIFIER);
 
-		return;
+		return false;
 	}
 	
 	Endpoint_Write_Stream_LE(&InquiryData, BytesTransferred, NO_STREAM_CALLBACK);
@@ -166,14 +178,18 @@ static void SCSI_Command_Inquiry(USB_ClassInfo_MS_Device_t* const MSInterfaceInf
 
 	/* Succeed the command and update the bytes transferred counter */
 	MSInterfaceInfo->State.CommandBlock.DataTransferLength -= BytesTransferred;
+	
+	return true;
 }
 
 /** Command processing for an issued SCSI REQUEST SENSE command. This command returns information about the last issued command,
  *  including the error code and additional error information so that the host can determine why a command failed to complete.
  *
  *  \param[in] MSInterfaceInfo  Pointer to the Mass Storage class interface structure that the command is associated with
+ *
+ *  \return Boolean true if the command completed successfully, false otherwise.
  */
-static void SCSI_Command_Request_Sense(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo)
+static bool SCSI_Command_Request_Sense(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo)
 {
 	uint8_t  AllocationLength = MSInterfaceInfo->State.CommandBlock.SCSICommandData[4];
 	uint8_t  BytesTransferred = (AllocationLength < sizeof(SenseData))? AllocationLength : sizeof(SenseData);
@@ -186,14 +202,18 @@ static void SCSI_Command_Request_Sense(USB_ClassInfo_MS_Device_t* const MSInterf
 
 	/* Succeed the command and update the bytes transferred counter */
 	MSInterfaceInfo->State.CommandBlock.DataTransferLength -= BytesTransferred;
+
+	return true;
 }
 
 /** Command processing for an issued SCSI READ CAPACITY (10) command. This command returns information about the device's capacity
  *  on the selected Logical Unit (drive), as a number of OS-sized blocks.
  *
  *  \param[in] MSInterfaceInfo  Pointer to the Mass Storage class interface structure that the command is associated with
+ *
+ *  \return Boolean true if the command completed successfully, false otherwise.
  */
-static void SCSI_Command_Read_Capacity_10(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo)
+static bool SCSI_Command_Read_Capacity_10(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo)
 {
 	uint32_t LastBlockAddressInLUN = (VIRTUAL_MEMORY_BLOCKS - 1);
 	uint32_t MediaBlockSize        = VIRTUAL_MEMORY_BLOCK_SIZE;
@@ -204,6 +224,8 @@ static void SCSI_Command_Read_Capacity_10(USB_ClassInfo_MS_Device_t* const MSInt
 	
 	/* Succeed the command and update the bytes transferred counter */
 	MSInterfaceInfo->State.CommandBlock.DataTransferLength -= 8;
+	
+	return true;
 }
 
 /** Command processing for an issued SCSI SEND DIAGNOSTIC command. This command performs a quick check of the Dataflash ICs on the
@@ -211,8 +233,10 @@ static void SCSI_Command_Read_Capacity_10(USB_ClassInfo_MS_Device_t* const MSInt
  *  supported.
  *
  *  \param[in] MSInterfaceInfo  Pointer to the Mass Storage class interface structure that the command is associated with
+ *
+ *  \return Boolean true if the command completed successfully, false otherwise.
  */
-static void SCSI_Command_Send_Diagnostic(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo)
+static bool SCSI_Command_Send_Diagnostic(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo)
 {
 	/* Check to see if the SELF TEST bit is not set */
 	if (!(MSInterfaceInfo->State.CommandBlock.SCSICommandData[1] & (1 << 2)))
@@ -222,7 +246,7 @@ static void SCSI_Command_Send_Diagnostic(USB_ClassInfo_MS_Device_t* const MSInte
 		               SCSI_ASENSE_INVALID_FIELD_IN_CDB,
 		               SCSI_ASENSEQ_NO_QUALIFIER);
 
-		return;
+		return false;
 	}
 	
 	/* Check to see if all attached Dataflash ICs are functional */
@@ -233,11 +257,13 @@ static void SCSI_Command_Send_Diagnostic(USB_ClassInfo_MS_Device_t* const MSInte
 		               SCSI_ASENSE_NO_ADDITIONAL_INFORMATION,
 		               SCSI_ASENSEQ_NO_QUALIFIER);	
 	
-		return;
+		return false;
 	}
 	
 	/* Succeed the command and update the bytes transferred counter */
 	MSInterfaceInfo->State.CommandBlock.DataTransferLength = 0;
+	
+	return true;
 }
 
 /** Command processing for an issued SCSI READ (10) or WRITE (10) command. This command reads in the block start address
@@ -246,12 +272,20 @@ static void SCSI_Command_Send_Diagnostic(USB_ClassInfo_MS_Device_t* const MSInte
  *
  *  \param[in] MSInterfaceInfo  Pointer to the Mass Storage class interface structure that the command is associated with
  *  \param[in] IsDataRead  Indicates if the command is a READ (10) command or WRITE (10) command (DATA_READ or DATA_WRITE)
+ *
+ *  \return Boolean true if the command completed successfully, false otherwise.
  */
-static void SCSI_Command_ReadWrite_10(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo,
+static bool SCSI_Command_ReadWrite_10(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo,
                                       const bool IsDataRead)
 {
-	uint32_t BlockAddress = SwapEndian_32(*(uint32_t*)&MSInterfaceInfo->State.CommandBlock.SCSICommandData[2]);
-	uint16_t TotalBlocks  = SwapEndian_16(*(uint16_t*)&MSInterfaceInfo->State.CommandBlock.SCSICommandData[7]);
+	uint32_t BlockAddress;
+	uint16_t TotalBlocks;
+	
+	/* Load in the 32-bit block address (SCSI uses big-endian, so have to reverse the byte order) */
+	BlockAddress = SwapEndian_32(*(uint32_t*)&MSInterfaceInfo->State.CommandBlock.SCSICommandData[2]);
+
+	/* Load in the 16-bit total blocks (SCSI uses big-endian, so have to reverse the byte order) */
+	TotalBlocks  = SwapEndian_16(*(uint16_t*)&MSInterfaceInfo->State.CommandBlock.SCSICommandData[7]);
 	
 	/* Check if the block address is outside the maximum allowable value for the LUN */
 	if (BlockAddress >= VIRTUAL_MEMORY_BLOCKS)
@@ -261,7 +295,7 @@ static void SCSI_Command_ReadWrite_10(USB_ClassInfo_MS_Device_t* const MSInterfa
 		               SCSI_ASENSE_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE,
 		               SCSI_ASENSEQ_NO_QUALIFIER);
 
-		return;
+		return false;
 	}
 	
 	/* Determine if the packet is a READ (10) or WRITE (10) command, call appropriate function */
@@ -272,4 +306,6 @@ static void SCSI_Command_ReadWrite_10(USB_ClassInfo_MS_Device_t* const MSInterfa
 
 	/* Update the bytes transferred counter and succeed the command */
 	MSInterfaceInfo->State.CommandBlock.DataTransferLength -= ((uint32_t)TotalBlocks * VIRTUAL_MEMORY_BLOCK_SIZE);
+	
+	return true;
 }
diff --git a/Projects/Webserver/Lib/SCSI.h b/Projects/Webserver/Lib/SCSI.h
index 3171c4899..64836c4a6 100644
--- a/Projects/Webserver/Lib/SCSI.h
+++ b/Projects/Webserver/Lib/SCSI.h
@@ -55,9 +55,9 @@
 		 *  \param[in] acode  New SCSI additional sense key to set the additional sense code to
 		 *  \param[in] aqual  New SCSI additional sense key qualifier to set the additional sense qualifier code to
 		 */
-		#define SCSI_SET_SENSE(key, acode, aqual)  MACROS{ SenseData.SenseKey = (key);                   \
-		                                                   SenseData.AdditionalSenseCode = (acode);      \
-		                                                   SenseData.AdditionalSenseQualifier = (aqual); }MACROE
+		#define SCSI_SET_SENSE(Key, Acode, Aqual)  MACROS{ SenseData.SenseKey                 = (Key);   \
+		                                                   SenseData.AdditionalSenseCode      = (Acode); \
+		                                                   SenseData.AdditionalSenseQualifier = (Aqual); }MACROE
 
 		/** Macro for the \ref SCSI_Command_ReadWrite_10() function, to indicate that data is to be read from the storage medium. */
 		#define DATA_READ           true
@@ -75,11 +75,11 @@
 		bool SCSI_DecodeSCSICommand(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo);
 		
 		#if defined(INCLUDE_FROM_SCSI_C)
-			static void SCSI_Command_Inquiry(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo);
-			static void SCSI_Command_Request_Sense(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo);
-			static void SCSI_Command_Read_Capacity_10(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo);
-			static void SCSI_Command_Send_Diagnostic(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo);
-			static void SCSI_Command_ReadWrite_10(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo,
+			static bool SCSI_Command_Inquiry(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo);
+			static bool SCSI_Command_Request_Sense(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo);
+			static bool SCSI_Command_Read_Capacity_10(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo);
+			static bool SCSI_Command_Send_Diagnostic(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo);
+			static bool SCSI_Command_ReadWrite_10(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo,
 			                                      const bool IsDataRead);
 		#endif