Description of the data path
GUPPY Technical Manual
V4.0.1
81
Auto shutter
In combination with auto white balance, all CCD and CMOS models are
equipped with auto shutter feature.
When enabled, the auto shutter adjusts the shutter within the default shutter
limits or within those set in advanced register F1000360h in order to reach
the reference brightness set in auto exposure register. Increasing the auto
exposure value increases the average brightness in the image and vice versa.
The applied algorithm uses a proportional plus integral controller (PI control-
ler) to achieve minimum delay with minimum overshot.
Register
Name
Field
Bit
Description
0xF0F00800
BRIGHTNESS
Presence_Inq
[0]
Presence of this feature:
0: N/A
1: Available
Abs_Control
[1]
Absolute value control
O: Control with value in the value
field
1: Control with value in the absolute
value CSR
If this bit= 1 the value in the value
field has to be ignored
-
[2..4]
Reserved
One_Push
[5]
Write: Set bit high to start
Read: Status of the feature:
Bit high: WIP
Bit low: Ready
ON_OFF
[6]
Write ON or OFF this feature ON=1
Read: Status of the feature OFF=0
A_M_MODE
[7]
Set bit high for Auto feature Read for
Mode; 0= MANUAL; 1= AUTO
-
[8..19]
Reserved
Value
[20..31]
Read/Write Value; this field is
ignored when writing the value in
Auto or OFF mode; if readout capabil-
ity is not available reading this field
has no meaning
Table 26: Brightness