Instruction manual

Description of the data path
MARLIN Technical Manua
l
Page 49
The table below describes the registers required.
Offset Name Field Bit Description
0xF1000250 SHDG_CTRL Presence_Inq [0] Indicates
presence of this
feature (read
only)
BuildError [1] tbd
--- [2..3]
ShowImage [4] Show shading
data as image
BuildImage [5] Build a new
ShadingImage
ON_OFF [6] Shading On/Off
Busy [7] Build in progress
--- [8..23]
GrabCount [24..31] Number of
images
0xF1000254 SHDG_MEM_CTRL Presence_Inq [0] Indicates
presence of this
feature (read
only)
--- [1..4]
EnableMemWR [5] Enable write
access
EnableMemRD [6] Enable read
access
--- [7]
AddrOffset [8..31]
0xF1000258 SHDG_INFO Presence_Inq [0] Indicates
presence of this
feature (read
only)
--- [1..7]
MaxImageSize [8..31] Max shading
Image size
Table 27: Shading control register

The maximum value of GRAB_COUNT depends on the type of camera and the number of
existing frame buffers. GRAB_COUNT is also automatically corrected to the power of two.
 The SHDG_CTRL register should not be queried at very short intervals, because each query
delays the generation of the shading image. A good interval time is 500 ms.