Instruction manual

Configuration of the camera

STINGRAY Technical Manual V2.2.0

296

GPDATA_BUFFER

GPDATA_BUFFER is a general purpose register that regulates the exchange of

data between camera and host for:

• writing look-up tables (LUTs) into the camera

• uploading/downloading of the shading image

GPDATA_INFO Buffer size query

GPDATA_BUFFER indicates the actual storage range

Little endian vs. big endian byte order

• Read/WriteBlock accesses to GPDATA_BUFFER are recommended, to read

or write more than 4 byte data. This increases the transfer speed com-

pared to accessing every single quadlet.

• The big endian byte order of the 1394 bus is unlike the little endian

byte order of common operating systems (Intel PC). Each quadlet of the

local buffer, containing the LUT data or shading image for instance, has

to be swapped bytewise from little endian byte order to big endian byte

order before writing on the bus.

0xF1000FFC GPDATA_INFO --- [0..15] Reserved

BufferSize [16..31] Size of GPDATA_BUFFER

(byte)

0xF1001000

…

0xF10017FC

GPDATA_BUFFER

Table 153: Advanced register: GPData buffer

Note

• Read the BufferSize before using.

• GPDATA_BUFFER can be used by only one function at a

time.

Bit depth little endian big endian Description

8 bit L0 L1 L2 L3  L3 L2 L1 L0 L: low byte

H: high byte

16 bit L0 H0 L1 H1  H1 L1 H0 L0

Table 154: Swapped first quadlet at address offset 0