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@ -113,6 +113,9 @@ bool SCSI_DecodeSCSICommand(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo)
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case SCSI_CMD_READ_10:
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CommandSuccess = SCSI_Command_ReadWrite_10(MSInterfaceInfo, DATA_READ);
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break;
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case SCSI_CMD_MODE_SENSE_6:
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CommandSuccess = SCSI_Command_ModeSense_6(MSInterfaceInfo);
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break;
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case SCSI_CMD_TEST_UNIT_READY:
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case SCSI_CMD_PREVENT_ALLOW_MEDIUM_REMOVAL:
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case SCSI_CMD_VERIFY_10:
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@ -281,6 +284,17 @@ static bool SCSI_Command_ReadWrite_10(USB_ClassInfo_MS_Device_t* const MSInterfa
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uint32_t BlockAddress;
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uint16_t TotalBlocks;
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/* Check if the disk is write protected or not */
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if ((IsDataRead == DATA_WRITE) && DISK_READ_ONLY)
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{
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/* Block address is invalid, update SENSE key and return command fail */
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SCSI_SET_SENSE(SCSI_SENSE_KEY_DATA_PROTECT,
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SCSI_ASENSE_WRITE_PROTECTED,
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SCSI_ASENSEQ_NO_QUALIFIER);
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return false;
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}
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/* Load in the 32-bit block address (SCSI uses big-endian, so have to reverse the byte order) */
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BlockAddress = SwapEndian_32(*(uint32_t*)&MSInterfaceInfo->State.CommandBlock.SCSICommandData[2]);
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@ -302,7 +316,7 @@ static bool SCSI_Command_ReadWrite_10(USB_ClassInfo_MS_Device_t* const MSInterfa
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/* Adjust the given block address to the real media address based on the selected LUN */
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BlockAddress += ((uint32_t)MSInterfaceInfo->State.CommandBlock.LUN * LUN_MEDIA_BLOCKS);
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#endif
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/* Determine if the packet is a READ (10) or WRITE (10) command, call appropriate function */
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if (IsDataRead == DATA_READ)
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DataflashManager_ReadBlocks(MSInterfaceInfo, BlockAddress, TotalBlocks);
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@ -315,3 +329,24 @@ static bool SCSI_Command_ReadWrite_10(USB_ClassInfo_MS_Device_t* const MSInterfa
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return true;
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}
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/** Command processing for an issued SCSI MODE SENSE (6) command. This command returns various informational pages about
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* the SCSI device, as well as the device's Write Protect status.
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*
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* \param[in] MSInterfaceInfo Pointer to the Mass Storage class interface structure that the command is associated with
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*
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* \return Boolean true if the command completed successfully, false otherwise.
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*/
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static bool SCSI_Command_ModeSense_6(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo)
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{
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/* Send an empty header response with the Write Protect flag status */
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Endpoint_Write_Byte(0x00);
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Endpoint_Write_Byte(0x00);
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Endpoint_Write_Byte(DISK_READ_ONLY ? 0x80 : 0x00);
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Endpoint_Write_Byte(0x00);
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Endpoint_ClearIN();
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/* Update the bytes transferred counter and succeed the command */
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MSInterfaceInfo->State.CommandBlock.DataTransferLength -= 4;
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return true;
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}
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