SCSI Commands - USB Mass Storage: Designing and Programming Devices and Embedded Hosts - page 142

The InquiryResponse data normally doesn't change, so a device can store the
data in ROM:
const rom InquiryResponse inq_resp = {
0x00, // direct access block device, connected

0x80, // device is removable

0x04, // SPC-2 compliance

0x02, // response data format

0x20, // response has 20h + 4 bytes

0x00, // additional fields, none set

0x00, // additional fields, none set

0x00, // additional fields, none set

"Microchp", // 8 -byte T10-assigned Vendor ID

"Mass Storage ", // 16-byte product identification

"0001" // 4-byte product revision level

};

Sending the Response
The MSDInquiryHandler function copies an InquiryResponse structure to
msd_buffer (defined in Chapter 3) for sending to the host and sets the
CSWDDataResidue and CSWStatus fields of the command's CSW.
The function calls the memcopypgm2ram function provided with the
Microchip C18 compiler. The function copies the response data from pro-
gram memory into RAM.
void MSDInquiryHandler(void)
{

byte i;

byte *buffer;

// Copy sizeof(InquiryResponse) bytes from program memory beginning at
// &inq_resp to RAM beginning at &med_buffer[0].

memcpypgm2ram
((byte *)&msd_buffer[0],
(byte *)&inq_resp,
sizeof(InquiryResponse));

msd_csw.dCSWDataResidue = sizeof(InquiryResponse);
msd_csw.bCSWStatus = 0x00;
return;
}