SCSI Commands - USB Mass Storage: Designing and Programming Devices and Embedded Hosts - page 138

Setting Default Values

The ResetSenseData function sets the values in the RequestSenseResponse
structure gblSenseData to default values:
RequestSenseResponse gblSenseData;

void ResetSenseData(void)
{
gblSenseData.ResponseCode = 0x70;

gblSenseData.VALID = 0x0;

gblSenseData.Obsolete = 0x0;

gblSenseData.SenseKey = 0x0;

gblSenseData.Resv = 0x0;

gblSenseData.ILI = 0x0;

gblSenseData.EOM = 0x0;

gblSenseData.FILEMARK = 0x0;

gblSenseData.Information._dword = 0x0;

gblSenseData.AddSenseLen = 0x0a;

gblSenseData.CmdSpecificInfo._dword = 0x0;

gblSenseData.ASC = 0x0;

gblSenseData.ASCQ = 0x0;

gblSenseData.FRUC = 0x0;

gblSenseData.SenseKeySpecific[0] = 0x0;

gblSenseData.SenseKeySpecific[1] = 0x0;

gblSenseData.SenseKeySpecific[2] = 0x0;

}
The sense codes can have assigned friendly names:
#define S_NOT_READY 0x2

#define S_MEDIUM_ERROR 0x3

#define S_ILLEGAL_REQUEST 0x5

#define S_UNIT_ATTENTION 0x6

#define ASC_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE 0x21

#define ASCQ_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE 0x00

#define ASC_MEDIUM_NOT_PRESENT 0x3a

#define ASCQ_MEDIUM_NOT_PRESENT 0x00

#define ASC_PERIPHERAL_DEVICE_WRITE_FAULT 0x03

#define ASCQ_PERIPHERAL_DEVICE_WRITE_FAULT 0x00

#define ASC_UNRECOVERED_READ_ERROR 0x11

#define ASCQ_UNRECOVERED_READ_ERROR 0x00

#define ASC_WRITE_PROTECTED 0x27

#define ASCQ_WRITE_PROTECTED 0x00