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Diffstat (limited to 'tmk_core/protocol/lufa/LUFA-git/Demos/Host/LowLevel/MassStorageHost/Lib/MassStoreCommands.c')
| -rw-r--r-- | tmk_core/protocol/lufa/LUFA-git/Demos/Host/LowLevel/MassStorageHost/Lib/MassStoreCommands.c | 635 |
1 files changed, 635 insertions, 0 deletions
diff --git a/tmk_core/protocol/lufa/LUFA-git/Demos/Host/LowLevel/MassStorageHost/Lib/MassStoreCommands.c b/tmk_core/protocol/lufa/LUFA-git/Demos/Host/LowLevel/MassStorageHost/Lib/MassStoreCommands.c new file mode 100644 index 0000000000..2c803eb96d --- /dev/null +++ b/tmk_core/protocol/lufa/LUFA-git/Demos/Host/LowLevel/MassStorageHost/Lib/MassStoreCommands.c @@ -0,0 +1,635 @@ +/* + LUFA Library + Copyright (C) Dean Camera, 2014. + + dean [at] fourwalledcubicle [dot] com + www.lufa-lib.org +*/ + +/* + Copyright 2014 Dean Camera (dean [at] fourwalledcubicle [dot] com) + + Permission to use, copy, modify, distribute, and sell this + software and its documentation for any purpose is hereby granted + without fee, provided that the above copyright notice appear in + all copies and that both that the copyright notice and this + permission notice and warranty disclaimer appear in supporting + documentation, and that the name of the author not be used in + advertising or publicity pertaining to distribution of the + software without specific, written prior permission. + + The author disclaims all warranties with regard to this + software, including all implied warranties of merchantability + and fitness. In no event shall the author be liable for any + special, indirect or consequential damages or any damages + whatsoever resulting from loss of use, data or profits, whether + in an action of contract, negligence or other tortious action, + arising out of or in connection with the use or performance of + this software. +*/ + +/** \file + * + * Mass Storage Device commands, to issue MSD commands to the device for + * reading device status, capacity, and other characteristics. This file + * also contains block read and write functions, so that device blocks + * can be read and written. In general, these functions would be chained + * to a FAT library to give file-level access to an attached device's contents. + * + * \note Many Mass Storage devices on the market are non-compliant to the + * specifications and thus can prove difficult to interface with. It + * may be necessary to retry the functions in the module several times + * after they have returned and error to successfully send the command + * to the device. Some devices may also need to have the stream function + * timeout period extended beyond 100ms (some badly designed devices exceeding + * 1.5 seconds occasionally) by defining USB_STREAM_TIMEOUT_MS to a + * larger value in the project makefile and passing it to the compiler + * via the -D switch. + */ + +#define INCLUDE_FROM_MASSSTORE_COMMANDS_C +#include "MassStoreCommands.h" + +/** Current Tag value used in issued CBWs to the device. This is automatically incremented + * each time a command is sent, and is not externally accessible. + */ +static uint32_t MassStore_Tag = 1; + + +/** Routine to send the current CBW to the device, and increment the Tag value as needed. + * + * \param[in] SCSICommandBlock Pointer to a SCSI command block structure to send to the attached device + * \param[in,out] BufferPtr Pointer to a buffer for the data to send or receive to/from the device, or NULL if no data + * + * \return A value from the Pipe_Stream_RW_ErrorCodes_t enum + */ +static uint8_t MassStore_SendCommand(MS_CommandBlockWrapper_t* const SCSICommandBlock, + void* BufferPtr) +{ + uint8_t ErrorCode = PIPE_RWSTREAM_NoError; + + /* Wrap Tag value when invalid - MS class defines tag values of 0 and 0xFFFFFFFF to be invalid */ + if (++MassStore_Tag == 0xFFFFFFFF) + MassStore_Tag = 1; + + /* Each transmission should have a unique tag value, increment before use */ + SCSICommandBlock->Tag = MassStore_Tag; + + /* Select the OUT data pipe for CBW transmission */ + Pipe_SelectPipe(MASS_STORE_DATA_OUT_PIPE); + Pipe_Unfreeze(); + + /* Write the CBW command to the OUT pipe */ + if ((ErrorCode = Pipe_Write_Stream_LE(SCSICommandBlock, sizeof(MS_CommandBlockWrapper_t), NULL)) != + PIPE_RWSTREAM_NoError) + { + Pipe_Freeze(); + return ErrorCode; + } + + /* Send the data in the OUT pipe to the attached device */ + Pipe_ClearOUT(); + + /* Wait until command has been sent */ + Pipe_WaitUntilReady(); + + /* Freeze pipe after use */ + Pipe_Freeze(); + + if (BufferPtr != NULL) + { + /* Transfer the requested data (if any) to or from the device */ + ErrorCode = MassStore_SendReceiveData(SCSICommandBlock, (void*)BufferPtr); + + /* Only fail completely if the transfer fails without a STALL, as a logical STALL can be recovered from */ + if ((ErrorCode != PIPE_RWSTREAM_NoError) && (ErrorCode != PIPE_RWSTREAM_PipeStalled)) + { + Pipe_Freeze(); + return ErrorCode; + } + } + + /* Retrieve the returned SCSI status from the device */ + MS_CommandStatusWrapper_t SCSIStatusBlock; + return MassStore_GetReturnedStatus(&SCSIStatusBlock); +} + +/** Waits until the attached device is ready to accept data following a CBW, checking + * to ensure that the device has not stalled the transaction. + * + * \return A value from the Pipe_Stream_RW_ErrorCodes_t enum + */ +static uint8_t MassStore_WaitForDataReceived(void) +{ + uint16_t TimeoutMSRem = COMMAND_DATA_TIMEOUT_MS; + uint16_t PreviousFrameNumber = USB_Host_GetFrameNumber(); + + /* Select the IN data pipe for data reception */ + Pipe_SelectPipe(MASS_STORE_DATA_IN_PIPE); + Pipe_Unfreeze(); + + /* Wait until data received in the IN pipe */ + while (!(Pipe_IsINReceived())) + { + uint16_t CurrentFrameNumber = USB_Host_GetFrameNumber(); + + /* Check to see if a new frame has been issued (1ms elapsed) */ + if (CurrentFrameNumber != PreviousFrameNumber) + { + /* Save the new frame number and decrement the timeout period */ + PreviousFrameNumber = CurrentFrameNumber; + TimeoutMSRem--; + + /* Check to see if the timeout period for the command has elapsed */ + if (!(TimeoutMSRem)) + return PIPE_RWSTREAM_Timeout; + } + + Pipe_Freeze(); + Pipe_SelectPipe(MASS_STORE_DATA_OUT_PIPE); + Pipe_Unfreeze(); + + /* Check if pipe stalled (command failed by device) */ + if (Pipe_IsStalled()) + { + /* Clear the stall condition on the OUT pipe */ + USB_Host_ClearEndpointStall(Pipe_GetBoundEndpointAddress()); + + return PIPE_RWSTREAM_PipeStalled; + } + + Pipe_Freeze(); + Pipe_SelectPipe(MASS_STORE_DATA_IN_PIPE); + Pipe_Unfreeze(); + + /* Check if pipe stalled (command failed by device) */ + if (Pipe_IsStalled()) + { + /* Clear the stall condition on the IN pipe */ + USB_Host_ClearEndpointStall(Pipe_GetBoundEndpointAddress()); + + return PIPE_RWSTREAM_PipeStalled; + } + + /* Check to see if the device was disconnected, if so exit function */ + if (USB_HostState == HOST_STATE_Unattached) + return PIPE_RWSTREAM_DeviceDisconnected; + }; + + Pipe_SelectPipe(MASS_STORE_DATA_IN_PIPE); + Pipe_Freeze(); + + Pipe_SelectPipe(MASS_STORE_DATA_OUT_PIPE); + Pipe_Freeze(); + + return PIPE_RWSTREAM_NoError; +} + +/** Sends or receives the transaction's data stage to or from the attached device, reading or + * writing to the nominated buffer. + * + * \param[in] SCSICommandBlock Pointer to a SCSI command block structure being sent to the attached device + * \param[in,out] BufferPtr Pointer to the data buffer to read from or write to + * + * \return A value from the Pipe_Stream_RW_ErrorCodes_t enum + */ +static uint8_t MassStore_SendReceiveData(MS_CommandBlockWrapper_t* const SCSICommandBlock, + void* BufferPtr) +{ + uint8_t ErrorCode = PIPE_RWSTREAM_NoError; + uint16_t BytesRem = SCSICommandBlock->DataTransferLength; + + /* Check the direction of the SCSI command data stage */ + if (SCSICommandBlock->Flags & MS_COMMAND_DIR_DATA_IN) + { + /* Wait until the device has replied with some data */ + if ((ErrorCode = MassStore_WaitForDataReceived()) != PIPE_RWSTREAM_NoError) + return ErrorCode; + + /* Select the IN data pipe for data reception */ + Pipe_SelectPipe(MASS_STORE_DATA_IN_PIPE); + Pipe_Unfreeze(); + + /* Read in the block data from the pipe */ + if ((ErrorCode = Pipe_Read_Stream_LE(BufferPtr, BytesRem, NULL)) != PIPE_RWSTREAM_NoError) + return ErrorCode; + + /* Acknowledge the packet */ + Pipe_ClearIN(); + } + else + { + /* Select the OUT data pipe for data transmission */ + Pipe_SelectPipe(MASS_STORE_DATA_OUT_PIPE); + Pipe_Unfreeze(); + + /* Write the block data to the pipe */ + if ((ErrorCode = Pipe_Write_Stream_LE(BufferPtr, BytesRem, NULL)) != PIPE_RWSTREAM_NoError) + return ErrorCode; + + /* Acknowledge the packet */ + Pipe_ClearOUT(); + + while (!(Pipe_IsOUTReady())) + { + if (USB_HostState == HOST_STATE_Unattached) + return PIPE_RWSTREAM_DeviceDisconnected; + } + } + + /* Freeze used pipe after use */ + Pipe_Freeze(); + + return PIPE_RWSTREAM_NoError; +} + +/** Routine to receive the current CSW from the device. + * + * \param[out] SCSICommandStatus Pointer to a destination where the returned status data should be stored + * + * \return A value from the Pipe_Stream_RW_ErrorCodes_t enum, or MASS_STORE_SCSI_COMMAND_FAILED if the SCSI command fails + */ +static uint8_t MassStore_GetReturnedStatus(MS_CommandStatusWrapper_t* const SCSICommandStatus) +{ + uint8_t ErrorCode = PIPE_RWSTREAM_NoError; + + /* If an error in the command occurred, abort */ + if ((ErrorCode = MassStore_WaitForDataReceived()) != PIPE_RWSTREAM_NoError) + return ErrorCode; + + /* Select the IN data pipe for data reception */ + Pipe_SelectPipe(MASS_STORE_DATA_IN_PIPE); + Pipe_Unfreeze(); + + /* Load in the CSW from the attached device */ + if ((ErrorCode = Pipe_Read_Stream_LE(SCSICommandStatus, sizeof(MS_CommandStatusWrapper_t), NULL)) != + PIPE_RWSTREAM_NoError) + { + return ErrorCode; + } + + /* Clear the data ready for next reception */ + Pipe_ClearIN(); + + /* Freeze the IN pipe after use */ + Pipe_Freeze(); + + /* Check to see if command failed */ + if (SCSICommandStatus->Status != MS_SCSI_COMMAND_Pass) + ErrorCode = MASS_STORE_SCSI_COMMAND_FAILED; + + return ErrorCode; +} + +/** Issues a Mass Storage class specific request to reset the attached device's Mass Storage interface, + * readying the device for the next CBW. The Data endpoints are cleared of any STALL condition once this + * command completes successfully. + * + * \return A value from the USB_Host_SendControlErrorCodes_t enum, or MASS_STORE_SCSI_COMMAND_FAILED if the SCSI command fails + */ +uint8_t MassStore_MassStorageReset(void) +{ + uint8_t ErrorCode; + + USB_ControlRequest = (USB_Request_Header_t) + { + .bmRequestType = (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE), + .bRequest = MS_REQ_MassStorageReset, + .wValue = 0, + .wIndex = 0, + .wLength = 0, + }; + + /* Select the control pipe for the request transfer */ + Pipe_SelectPipe(PIPE_CONTROLPIPE); + + if ((ErrorCode = USB_Host_SendControlRequest(NULL)) != HOST_SENDCONTROL_Successful) + return ErrorCode; + + /* Select first data pipe to clear STALL condition if one exists */ + Pipe_SelectPipe(MASS_STORE_DATA_IN_PIPE); + + if ((ErrorCode = USB_Host_ClearEndpointStall(Pipe_GetBoundEndpointAddress())) != HOST_SENDCONTROL_Successful) + return ErrorCode; + + /* Select second data pipe to clear STALL condition if one exists */ + Pipe_SelectPipe(MASS_STORE_DATA_OUT_PIPE); + + if ((ErrorCode = USB_Host_ClearEndpointStall(Pipe_GetBoundEndpointAddress())) != HOST_SENDCONTROL_Successful) + return ErrorCode; + + return HOST_SENDCONTROL_Successful; +} + +/** Issues a Mass Storage class specific request to determine the index of the highest numbered Logical + * Unit in the attached device. + * + * \note Some devices do not support this request, and will STALL it when issued. To get around this, + * on unsupported devices the max LUN index will be reported as zero and no error will be returned + * if the device STALLs the request. + * + * \param[out] MaxLUNIndex Pointer to the location that the maximum LUN index value should be stored + * + * \return A value from the USB_Host_SendControlErrorCodes_t enum, or MASS_STORE_SCSI_COMMAND_FAILED if the SCSI command fails + */ +uint8_t MassStore_GetMaxLUN(uint8_t* const MaxLUNIndex) +{ + uint8_t ErrorCode; + + USB_ControlRequest = (USB_Request_Header_t) + { + .bmRequestType = (REQDIR_DEVICETOHOST | REQTYPE_CLASS | REQREC_INTERFACE), + .bRequest = MS_REQ_GetMaxLUN, + .wValue = 0, + .wIndex = 0, + .wLength = 1, + }; + + /* Select the control pipe for the request transfer */ + Pipe_SelectPipe(PIPE_CONTROLPIPE); + + if ((ErrorCode = USB_Host_SendControlRequest(MaxLUNIndex)) == HOST_SENDCONTROL_SetupStalled) + { + /* Clear the pipe stall */ + Pipe_ClearStall(); + + /* Some faulty Mass Storage devices don't implement the GET_MAX_LUN request, so assume a single LUN */ + *MaxLUNIndex = 0; + + /* Clear the error, and pretend the request executed correctly if the device STALLed it */ + ErrorCode = HOST_SENDCONTROL_Successful; + } + + return ErrorCode; +} + +/** Issues a SCSI Inquiry command to the attached device, to determine the device's information. This + * gives information on the device's capabilities. + * + * \param[in] LUNIndex Index of the LUN inside the device the command is being addressed to + * \param[out] InquiryPtr Pointer to the inquiry data structure where the inquiry data from the device is to be stored + * + * \return A value from the Pipe_Stream_RW_ErrorCodes_t enum, or MASS_STORE_SCSI_COMMAND_FAILED if the SCSI command fails + */ +uint8_t MassStore_Inquiry(const uint8_t LUNIndex, + SCSI_Inquiry_Response_t* const InquiryPtr) +{ + /* Create a CBW with a SCSI command to issue INQUIRY command */ + MS_CommandBlockWrapper_t SCSICommandBlock = (MS_CommandBlockWrapper_t) + { + .Signature = MS_CBW_SIGNATURE, + .DataTransferLength = sizeof(SCSI_Inquiry_Response_t), + .Flags = MS_COMMAND_DIR_DATA_IN, + .LUN = LUNIndex, + .SCSICommandLength = 6, + .SCSICommandData = + { + SCSI_CMD_INQUIRY, + 0x00, // Reserved + 0x00, // Reserved + 0x00, // Reserved + sizeof(SCSI_Inquiry_Response_t), // Allocation Length + 0x00 // Unused (control) + } + }; + + /* Send the command and any data to the attached device */ + return MassStore_SendCommand(&SCSICommandBlock, InquiryPtr); +} + +/** Issues a SCSI Request Sense command to the attached device, to determine the current SCSI sense information. This + * gives error codes for the last issued SCSI command to the device. + * + * \param[in] LUNIndex Index of the LUN inside the device the command is being addressed to + * \param[out] SensePtr Pointer to the sense data structure where the sense data from the device is to be stored + * + * \return A value from the Pipe_Stream_RW_ErrorCodes_t enum, or MASS_STORE_SCSI_COMMAND_FAILED if the SCSI command fails + */ +uint8_t MassStore_RequestSense(const uint8_t LUNIndex, + SCSI_Request_Sense_Response_t* const SensePtr) +{ + /* Create a CBW with a SCSI command to issue REQUEST SENSE command */ + MS_CommandBlockWrapper_t SCSICommandBlock = (MS_CommandBlockWrapper_t) + { + .Signature = MS_CBW_SIGNATURE, + .DataTransferLength = sizeof(SCSI_Request_Sense_Response_t), + .Flags = MS_COMMAND_DIR_DATA_IN, + .LUN = LUNIndex, + .SCSICommandLength = 6, + .SCSICommandData = + { + SCSI_CMD_REQUEST_SENSE, + 0x00, // Reserved + 0x00, // Reserved + 0x00, // Reserved + sizeof(SCSI_Request_Sense_Response_t), // Allocation Length + 0x00 // Unused (control) + } + }; + + /* Send the command and any data to the attached device */ + return MassStore_SendCommand(&SCSICommandBlock, SensePtr); +} + +/** Issues a SCSI Device Block Read command to the attached device, to read in one or more data blocks from the + * storage medium into a buffer. + * + * \param[in] LUNIndex Index of the LUN inside the device the command is being addressed to + * \param[in] BlockAddress Start block address to read from + * \param[in] Blocks Number of blocks to read from the device + * \param[in] BlockSize Size in bytes of each block to read + * \param[out] BufferPtr Pointer to the buffer where the read data is to be written to + * + * \return A value from the Pipe_Stream_RW_ErrorCodes_t enum, or MASS_STORE_SCSI_COMMAND_FAILED if the SCSI command fails + */ +uint8_t MassStore_ReadDeviceBlock(const uint8_t LUNIndex, + const uint32_t BlockAddress, + const uint8_t Blocks, + const uint16_t BlockSize, + void* BufferPtr) +{ + /* Create a CBW with a SCSI command to read in the given blocks from the device */ + MS_CommandBlockWrapper_t SCSICommandBlock = (MS_CommandBlockWrapper_t) + { + .Signature = MS_CBW_SIGNATURE, + .DataTransferLength = ((uint32_t)Blocks * BlockSize), + .Flags = MS_COMMAND_DIR_DATA_IN, + .LUN = LUNIndex, + .SCSICommandLength = 10, + .SCSICommandData = + { + SCSI_CMD_READ_10, + 0x00, // Unused (control bits, all off) + (BlockAddress >> 24), // MSB of Block Address + (BlockAddress >> 16), + (BlockAddress >> 8), + (BlockAddress & 0xFF), // LSB of Block Address + 0x00, // Reserved + 0x00, // MSB of Total Blocks to Read + Blocks, // LSB of Total Blocks to Read + 0x00 // Unused (control) + } + }; + + /* Send the command and any data to the attached device */ + return MassStore_SendCommand(&SCSICommandBlock, BufferPtr); +} + +/** Issues a SCSI Device Block Write command to the attached device, to write one or more data blocks to the + * storage medium from a buffer. + * + * \param[in] LUNIndex Index of the LUN inside the device the command is being addressed to + * \param[in] BlockAddress Start block address to write to + * \param[in] Blocks Number of blocks to write to in the device + * \param[in] BlockSize Size in bytes of each block to write + * \param[in] BufferPtr Pointer to the buffer where the write data is to be sourced from + * + * \return A value from the Pipe_Stream_RW_ErrorCodes_t enum, or MASS_STORE_SCSI_COMMAND_FAILED if the SCSI command fails + */ +uint8_t MassStore_WriteDeviceBlock(const uint8_t LUNIndex, + const uint32_t BlockAddress, + const uint8_t Blocks, + const uint16_t BlockSize, + void* BufferPtr) +{ + /* Create a CBW with a SCSI command to write the given blocks to the device */ + MS_CommandBlockWrapper_t SCSICommandBlock = (MS_CommandBlockWrapper_t) + { + .Signature = MS_CBW_SIGNATURE, + .DataTransferLength = ((uint32_t)Blocks * BlockSize), + .Flags = MS_COMMAND_DIR_DATA_OUT, + .LUN = LUNIndex, + .SCSICommandLength = 10, + .SCSICommandData = + { + SCSI_CMD_WRITE_10, + 0x00, // Unused (control bits, all off) + (BlockAddress >> 24), // MSB of Block Address + (BlockAddress >> 16), + (BlockAddress >> 8), + (BlockAddress & 0xFF), // LSB of Block Address + 0x00, // Unused (reserved) + 0x00, // MSB of Total Blocks to Write + Blocks, // LSB of Total Blocks to Write + 0x00 // Unused (control) + } + }; + + /* Send the command and any data to the attached device */ + return MassStore_SendCommand(&SCSICommandBlock, BufferPtr); +} + +/** Issues a SCSI Device Test Unit Ready command to the attached device, to determine if the device is ready to accept + * other commands. + * + * \param[in] LUNIndex Index of the LUN inside the device the command is being addressed to + * + * \return A value from the Pipe_Stream_RW_ErrorCodes_t enum, or MASS_STORE_SCSI_COMMAND_FAILED if the SCSI command fails + */ +uint8_t MassStore_TestUnitReady(const uint8_t LUNIndex) +{ + /* Create a CBW with a SCSI command to issue TEST UNIT READY command */ + MS_CommandBlockWrapper_t SCSICommandBlock = (MS_CommandBlockWrapper_t) + { + .Signature = MS_CBW_SIGNATURE, + .DataTransferLength = 0, + .Flags = MS_COMMAND_DIR_DATA_IN, + .LUN = LUNIndex, + .SCSICommandLength = 6, + .SCSICommandData = + { + SCSI_CMD_TEST_UNIT_READY, + 0x00, // Reserved + 0x00, // Reserved + 0x00, // Reserved + 0x00, // Reserved + 0x00 // Unused (control) + } + }; + + /* Send the command and any data to the attached device */ + return MassStore_SendCommand(&SCSICommandBlock, NULL); +} + +/** Issues a SCSI Device Read Capacity command to the attached device, to determine the capacity of the + * given Logical Unit within the device. + * + * \param[in] LUNIndex Index of the LUN inside the device the command is being addressed to + * \param[out] CapacityPtr Device capacity structure where the capacity data is to be stored + * + * \return A value from the Pipe_Stream_RW_ErrorCodes_t enum, or MASS_STORE_SCSI_COMMAND_FAILED if the SCSI command fails + */ +uint8_t MassStore_ReadCapacity(const uint8_t LUNIndex, + SCSI_Capacity_t* const CapacityPtr) +{ + uint8_t ErrorCode = PIPE_RWSTREAM_NoError; + + /* Create a CBW with a SCSI command to issue READ CAPACITY command */ + MS_CommandBlockWrapper_t SCSICommandBlock = (MS_CommandBlockWrapper_t) + { + .Signature = MS_CBW_SIGNATURE, + .DataTransferLength = sizeof(SCSI_Capacity_t), + .Flags = MS_COMMAND_DIR_DATA_IN, + .LUN = LUNIndex, + .SCSICommandLength = 10, + .SCSICommandData = + { + SCSI_CMD_READ_CAPACITY_10, + 0x00, // Reserved + 0x00, // MSB of Logical block address + 0x00, + 0x00, + 0x00, // LSB of Logical block address + 0x00, // Reserved + 0x00, // Reserved + 0x00, // Partial Medium Indicator + 0x00 // Unused (control) + } + }; + + /* Send the command and any data to the attached device */ + if ((ErrorCode = MassStore_SendCommand(&SCSICommandBlock, CapacityPtr)) != PIPE_RWSTREAM_NoError) + return ErrorCode; + + /* Endian-correct the read data */ + CapacityPtr->Blocks = SwapEndian_32(CapacityPtr->Blocks); + CapacityPtr->BlockSize = SwapEndian_32(CapacityPtr->BlockSize); + + return ErrorCode; +} + +/** Issues a SCSI Device Prevent/Allow Medium Removal command to the attached device, to lock the physical media from + * being removed. This is a legacy command for SCSI disks with removable storage (such as ZIP disks), but should still + * be issued before the first read or write command is sent. + * + * \param[in] LUNIndex Index of the LUN inside the device the command is being addressed to + * \param[in] PreventRemoval Whether or not the LUN media should be locked to prevent removal or not + * + * \return A value from the Pipe_Stream_RW_ErrorCodes_t enum, or MASS_STORE_SCSI_COMMAND_FAILED if the SCSI command fails + */ +uint8_t MassStore_PreventAllowMediumRemoval(const uint8_t LUNIndex, + const bool PreventRemoval) +{ + /* Create a CBW with a SCSI command to issue PREVENT ALLOW MEDIUM REMOVAL command */ + MS_CommandBlockWrapper_t SCSICommandBlock = (MS_CommandBlockWrapper_t) + { + .Signature = MS_CBW_SIGNATURE, + .DataTransferLength = 0, + .Flags = MS_COMMAND_DIR_DATA_OUT, + .LUN = LUNIndex, + .SCSICommandLength = 6, + .SCSICommandData = + { + SCSI_CMD_PREVENT_ALLOW_MEDIUM_REMOVAL, + 0x00, // Reserved + 0x00, // Reserved + PreventRemoval, // Prevent flag + 0x00, // Reserved + 0x00 // Unused (control) + } + }; + + /* Send the command and any data to the attached device */ + return MassStore_SendCommand(&SCSICommandBlock, NULL); +} + |