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Added ability to write protect Mass Storage disk write operations from the host OS.

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This commit is contained in:
Dean Camera 2010-11-26 04:16:47 +00:00
parent b634ec50a0
commit 9f7883fa2b
20 changed files with 252 additions and 16 deletions
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40
Demos/Device/LowLevel/MassStorage/Lib/SCSI.c
View file

@ -111,6 +111,9 @@ bool SCSI_DecodeSCSICommand(void)
case SCSI_CMD_READ_10:
CommandSuccess = SCSI_Command_ReadWrite_10(DATA_READ);
break;
case SCSI_CMD_MODE_SENSE_6:
CommandSuccess = SCSI_Command_ModeSense_6();
break;
case SCSI_CMD_TEST_UNIT_READY:
case SCSI_CMD_PREVENT_ALLOW_MEDIUM_REMOVAL:
case SCSI_CMD_VERIFY_10:
@ -278,9 +281,23 @@ static bool SCSI_Command_Send_Diagnostic(void)
*/
static bool SCSI_Command_ReadWrite_10(const bool IsDataRead)
{
uint32_t BlockAddress = SwapEndian_32(*(uint32_t*)&CommandBlock.SCSICommandData[2]);
uint16_t TotalBlocks = SwapEndian_16(*(uint16_t*)&CommandBlock.SCSICommandData[7]);
uint32_t BlockAddress;
uint16_t TotalBlocks;
/* Check if the disk is write protected or not */
if ((IsDataRead == DATA_WRITE) && DISK_READ_ONLY)
{
/* Block address is invalid, update SENSE key and return command fail */
SCSI_SET_SENSE(SCSI_SENSE_KEY_DATA_PROTECT,
SCSI_ASENSE_WRITE_PROTECTED,
SCSI_ASENSEQ_NO_QUALIFIER);
return false;
}
BlockAddress = SwapEndian_32(*(uint32_t*)&CommandBlock.SCSICommandData[2]);
TotalBlocks = SwapEndian_16(*(uint16_t*)&CommandBlock.SCSICommandData[7]);
/* Check if the block address is outside the maximum allowable value for the LUN */
if (BlockAddress >= LUN_MEDIA_BLOCKS)
{
@ -309,3 +326,22 @@ static bool SCSI_Command_ReadWrite_10(const bool IsDataRead)
return true;
}
/** 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.
*
* \return Boolean true if the command completed successfully, false otherwise.
*/
static bool SCSI_Command_ModeSense_6(void)
{
/* Send an empty header response with the Write Protect flag status */
Endpoint_Write_Byte(0x00);
Endpoint_Write_Byte(0x00);
Endpoint_Write_Byte(DISK_READ_ONLY ? 0x80 : 0x00);
Endpoint_Write_Byte(0x00);
Endpoint_ClearIN();
/* Update the bytes transferred counter and succeed the command */
CommandBlock.DataTransferLength -= 4;
return true;
}

1
Demos/Device/LowLevel/MassStorage/Lib/SCSI.h
View file

@ -143,6 +143,7 @@
static bool SCSI_Command_Read_Capacity_10(void);
static bool SCSI_Command_Send_Diagnostic(void);
static bool SCSI_Command_ReadWrite_10(const bool IsDataRead);
static bool SCSI_Command_ModeSense_6(void);
#endif
#endif

3
Demos/Device/LowLevel/MassStorage/MassStorage.h
View file

@ -68,6 +68,9 @@
/** LED mask for the library LED driver, to indicate that the USB interface is busy. */
#define LEDMASK_USB_BUSY LEDS_LED2
/** Indicates if the disk is write protected or not. */
#define DISK_READ_ONLY false
/* Global Variables: */
extern MS_CommandBlockWrapper_t CommandBlock;
extern MS_CommandStatusWrapper_t CommandStatus;