Pike
Technical
Manual
V5.2.3
334
Configuration of the camera
Configuration
of
the
camera
•
The
FRAMETIME_CTRL
register
does
not
change
the
shutter
or
BytePerPacket
settings.
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
compared
to
accessing
every
single
quadlet.
•
The
big
endian
byte
order
of
the
IEEE1394
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.
Register
Name
Field
Bit
Description
0xF1000FFC
GPDATA_INFO
---
[0
to
15]
Reserved
BufferSize
[16
to
31]
Size
of
GPDATA_BUFFER
(byte)
0xF1001000
…
0xF10017FC
GPDATA_BUFFER
Table 199: 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 200: Swapped first quadlet at address offset 0
