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Cleanups to the Device mode Mass Storage demo applications' SCSI routines.

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This commit is contained in:
Dean Camera 2009-10-02 07:40:24 +00:00
parent 3ecc462954
commit b7eead83aa
7 changed files with 62 additions and 121 deletions
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78
Demos/Device/LowLevel/MassStorage/Lib/SCSI.c
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@ -83,37 +83,41 @@ SCSI_Request_Sense_Response_t SenseData =
/** Main routine to process the SCSI command located in the Command Block Wrapper read from the host. This dispatches
* to the appropriate SCSI command handling routine if the issued command is supported by the device, else it returns
* a command failure due to a ILLEGAL REQUEST.
*
* \return Boolean true if the command completed sucessfully, false otherwise
*/
void SCSI_DecodeSCSICommand(void)
bool SCSI_DecodeSCSICommand(void)
{
bool CommandSuccess = false;
/* 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);
/* Run the appropriate SCSI command hander function based on the passed command */
switch (CommandBlock.SCSICommandData[0])
{
case SCSI_CMD_INQUIRY:
CommandSuccess = SCSI_Command_Inquiry();
SCSI_Command_Inquiry();
break;
case SCSI_CMD_REQUEST_SENSE:
CommandSuccess = SCSI_Command_Request_Sense();
SCSI_Command_Request_Sense();
break;
case SCSI_CMD_READ_CAPACITY_10:
CommandSuccess = SCSI_Command_Read_Capacity_10();
SCSI_Command_Read_Capacity_10();
break;
case SCSI_CMD_SEND_DIAGNOSTIC:
CommandSuccess = SCSI_Command_Send_Diagnostic();
SCSI_Command_Send_Diagnostic();
break;
case SCSI_CMD_WRITE_10:
CommandSuccess = SCSI_Command_ReadWrite_10(DATA_WRITE);
SCSI_Command_ReadWrite_10(DATA_WRITE);
break;
case SCSI_CMD_READ_10:
CommandSuccess = SCSI_Command_ReadWrite_10(DATA_READ);
SCSI_Command_ReadWrite_10(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;
CommandBlock.DataTransferLength = 0;
break;
default:
@ -124,29 +128,13 @@ void SCSI_DecodeSCSICommand(void)
break;
}
/* Check if command was successfully processed */
if (CommandSuccess)
{
/* Command succeeded - set the CSW status and update the SENSE key */
CommandStatus.Status = Command_Pass;
SCSI_SET_SENSE(SCSI_SENSE_KEY_GOOD,
SCSI_ASENSE_NO_ADDITIONAL_INFORMATION,
SCSI_ASENSEQ_NO_QUALIFIER);
}
else
{
/* Command failed - set the CSW status - failed command function updates the SENSE key */
CommandStatus.Status = Command_Fail;
}
return (SenseData.SenseKey == SCSI_SENSE_KEY_GOOD);
}
/** Command processing for an issued SCSI INQUIRY command. This command returns information about the device's features
* and capabilities to the host.
*
* \return Boolean true if the command completed successfully, false otherwise.
*/
static bool SCSI_Command_Inquiry(void)
static void SCSI_Command_Inquiry(void)
{
uint16_t AllocationLength = (((uint16_t)CommandBlock.SCSICommandData[3] << 8) |
CommandBlock.SCSICommandData[4]);
@ -162,7 +150,7 @@ static bool SCSI_Command_Inquiry(void)
SCSI_ASENSE_INVALID_FIELD_IN_CDB,
SCSI_ASENSEQ_NO_QUALIFIER);
return false;
return;
}
/* Write the INQUIRY data to the endpoint */
@ -178,16 +166,12 @@ static bool SCSI_Command_Inquiry(void)
/* Succeed the command and update the bytes transferred counter */
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.
*
* \return Boolean true if the command completed successfully, false otherwise.
*/
static bool SCSI_Command_Request_Sense(void)
static void SCSI_Command_Request_Sense(void)
{
uint8_t AllocationLength = CommandBlock.SCSICommandData[4];
uint8_t BytesTransferred = (AllocationLength < sizeof(SenseData))? AllocationLength : sizeof(SenseData);
@ -205,16 +189,12 @@ static bool SCSI_Command_Request_Sense(void)
/* Succeed the command and update the bytes transferred counter */
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.
*
* \return Boolean true if the command completed successfully, false otherwise.
*/
static bool SCSI_Command_Read_Capacity_10(void)
static void SCSI_Command_Read_Capacity_10(void)
{
/* Send the total number of logical blocks in the current LUN */
Endpoint_Write_DWord_BE(LUN_MEDIA_BLOCKS - 1);
@ -224,15 +204,13 @@ static bool SCSI_Command_Read_Capacity_10(void)
/* Check if the current command is being aborted by the host */
if (IsMassStoreReset)
return false;
return;
/* Send the endpoint data packet to the host */
Endpoint_ClearIN();
/* Succeed the command and update the bytes transferred counter */
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
@ -240,10 +218,8 @@ static bool SCSI_Command_Read_Capacity_10(void)
* 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 bool SCSI_Command_Send_Diagnostic(void)
static void SCSI_Command_Send_Diagnostic(void)
{
/* Check to see if the SELF TEST bit is not set */
if (!(CommandBlock.SCSICommandData[1] & (1 << 2)))
@ -253,7 +229,7 @@ static bool SCSI_Command_Send_Diagnostic(void)
SCSI_ASENSE_INVALID_FIELD_IN_CDB,
SCSI_ASENSEQ_NO_QUALIFIER);
return false;
return;
}
/* Check to see if all attached Dataflash ICs are functional */
@ -264,13 +240,11 @@ static bool SCSI_Command_Send_Diagnostic(void)
SCSI_ASENSE_NO_ADDITIONAL_INFORMATION,
SCSI_ASENSEQ_NO_QUALIFIER);
return false;
return;
}
/* Succeed the command and update the bytes transferred counter */
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
@ -278,10 +252,8 @@ static bool SCSI_Command_Send_Diagnostic(void)
* reading and writing of the data.
*
* \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 bool SCSI_Command_ReadWrite_10(const bool IsDataRead)
static void SCSI_Command_ReadWrite_10(const bool IsDataRead)
{
uint32_t BlockAddress;
uint16_t TotalBlocks;
@ -304,7 +276,7 @@ static bool SCSI_Command_ReadWrite_10(const bool IsDataRead)
SCSI_ASENSE_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE,
SCSI_ASENSEQ_NO_QUALIFIER);
return false;
return;
}
#if (TOTAL_LUNS > 1)
@ -320,6 +292,4 @@ static bool SCSI_Command_ReadWrite_10(const bool IsDataRead)
/* Update the bytes transferred counter and succeed the command */
CommandBlock.DataTransferLength -= ((uint32_t)TotalBlocks * VIRTUAL_MEMORY_BLOCK_SIZE);
return true;
}