/** 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 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 = MIN(AllocationLength, sizeof(InquiryData));
/* Only the standard INQUIRY data is supported, check if any optional INQUIRY bits set */
if ((MSInterfaceInfo->State.CommandBlock.SCSICommandData[1] & ((1 << 0) | (1 << 1))) ||
MSInterfaceInfo->State.CommandBlock.SCSICommandData[2])
{
/* Optional but unsupported bits set - update the SENSE key and fail the request */
SCSI_SET_SENSE(SCSI_SENSE_KEY_ILLEGAL_REQUEST,
SCSI_ASENSE_INVALID_FIELD_IN_CDB,
SCSI_ASENSEQ_NO_QUALIFIER);
return false;
}
Endpoint_Write_Stream_LE(&InquiryData, BytesTransferred, NULL);
/* Pad out remaining bytes with 0x00 */
Endpoint_Null_Stream((AllocationLength - BytesTransferred), NULL);
/* Finalize the stream transfer to send the last packet */
Endpoint_ClearIN();
/* 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 bool SCSI_Command_Request_Sense(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo)
{
uint8_t AllocationLength = MSInterfaceInfo->State.CommandBlock.SCSICommandData[4];
uint8_t BytesTransferred = MIN(AllocationLength, sizeof(SenseData));
Endpoint_Write_Stream_LE(&SenseData, BytesTransferred, NULL);
Endpoint_Null_Stream((AllocationLength - BytesTransferred), NULL);
Endpoint_ClearIN();
/* 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.
*
* \return Boolean true if the command completed successfully, false otherwise.
*/
static bool SCSI_Command_Request_Sense(void)
{
uint8_t AllocationLength = CommandBlock.SCSICommandData[4];
uint8_t BytesTransferred = MIN(AllocationLength, sizeof(SenseData));
/* Send the SENSE data - this indicates to the host the status of the last command */
Endpoint_Write_Stream_LE(&SenseData, BytesTransferred, NULL);
/* Pad out remaining bytes with 0x00 */
Endpoint_Null_Stream((AllocationLength - BytesTransferred), NULL);
/* Finalize the stream transfer to send the last packet */
Endpoint_ClearIN();
/* Succeed the command and update the bytes transferred counter */
CommandBlock.DataTransferLength -= BytesTransferred;
return true;
}
