SCSI.c File Reference

#include "SCSI.h"

Functions
bool	SCSI_DecodeSCSICommand (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_ReadWrite_10 (USB_ClassInfo_MS_Device_t *const MSInterfaceInfo, const bool IsDataRead)
static bool	SCSI_Command_ModeSense_6 (USB_ClassInfo_MS_Device_t *const MSInterfaceInfo)

Variables
static const SCSI_Inquiry_Response_t	InquiryData
static SCSI_Request_Sense_Response_t	SenseData

Detailed Description

SCSI command processing routines, for SCSI commands issued by the host. Mass Storage devices use a thin "Bulk-Only Transport" protocol for issuing commands and status information, which wrap around standard SCSI device commands for controlling the actual storage medium.

Function Documentation

static bool SCSI_Command_Inquiry ( USB_ClassInfo_MS_Device_t *const  MSInterfaceInfo)

static

Command processing for an issued SCSI INQUIRY command. This command returns information about the device's features and capabilities to the host.

Parameters

[in]

MSInterfaceInfo

Pointer to the Mass Storage class interface structure that the command is associated with

Returns

Boolean true if the command completed successfully, false otherwise.

static bool SCSI_Command_ModeSense_6 ( USB_ClassInfo_MS_Device_t *const  MSInterfaceInfo)

static

Command processing for an issued SCSI MODE SENSE (6) command. This command returns various informational pages about the SCSI device, as well as the device's Write Protect status.

Parameters

[in]

MSInterfaceInfo

Pointer to the Mass Storage class interface structure that the command is associated with

Returns

Boolean true if the command completed successfully, false otherwise.

static bool SCSI_Command_Read_Capacity_10 ( USB_ClassInfo_MS_Device_t *const  MSInterfaceInfo)

static

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.

Parameters

[in]

MSInterfaceInfo

Pointer to the Mass Storage class interface structure that the command is associated with

Returns

Boolean true if the command completed successfully, false otherwise.

static bool SCSI_Command_ReadWrite_10 ( USB_ClassInfo_MS_Device_t *const  MSInterfaceInfo, const bool  IsDataRead  )

static

Command processing for an issued SCSI READ (10) or WRITE (10) command. This command reads in the block start address and total number of blocks to process, then calls the appropriate low-level Dataflash routine to handle the actual reading and writing of the data.

Parameters

[in]	MSInterfaceInfo	Pointer to the Mass Storage class interface structure that the command is associated with
[in]	IsDataRead	Indicates if the command is a READ (10) command or WRITE (10) command (DATA_READ or DATA_WRITE)

Returns

Boolean true if the command completed successfully, false otherwise.

static bool SCSI_Command_Request_Sense ( USB_ClassInfo_MS_Device_t *const  MSInterfaceInfo)

static

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.

Parameters

[in]

MSInterfaceInfo

Pointer to the Mass Storage class interface structure that the command is associated with

Returns

Boolean true if the command completed successfully, false otherwise.

bool SCSI_DecodeSCSICommand

(

USB_ClassInfo_MS_Device_t *const

MSInterfaceInfo)

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.

Parameters

[in]

MSInterfaceInfo

Pointer to the Mass Storage class interface structure that the command is associated with

Returns

Boolean true if the command completed successfully, false otherwise

Variable Documentation

const SCSI_Inquiry_Response_t InquiryData

static

Initial value:

=
    {
        .DeviceType          = DEVICE_TYPE_BLOCK,
        .PeripheralQualifier = 0,

        .Removable           = true,

        .Version             = 0,

        .ResponseDataFormat  = 2,
        .NormACA             = false,
        .TrmTsk              = false,
        .AERC                = false,

        .AdditionalLength    = 0x1F,

        .SoftReset           = false,
        .CmdQue              = false,
        .Linked              = false,
        .Sync                = false,
        .WideBus16Bit        = false,
        .WideBus32Bit        = false,
        .RelAddr             = false,

        .VendorID            = "LUFA",
        .ProductID           = "Bootloader",
        .RevisionID          = {'0','.','0','0'},
    }

Structure to hold the SCSI response data to a SCSI INQUIRY command. This gives information about the device's features and capabilities.

SCSI_Request_Sense_Response_t SenseData

static

Initial value:

=
    {
        .ResponseCode        = 0x70,
        .AdditionalLength    = 0x0A,
    }

Structure to hold the sense data for the last issued SCSI command, which is returned to the host after a SCSI REQUEST SENSE command is issued. This gives information on exactly why the last command failed to complete.