Allied International AVT OSCAR V2.4.0 Manual Do Utilizador

 OSCAR Technical Manual V2.4.0

65

In combination with auto white balance, all Oscar cameras are equipped with 
auto gain feature.

When enabled auto gain adjusts the gain within the default gain limits or 
within the limits set in advanced register F1000370h in order to reach the 
brightness set in auto exposure register as reference.

Increasing the auto exposure value (aka target grey value) increases the aver-
age brightness in the image and vice versa.

The applied algorithm uses a proportional plus integral controller (PI control-
ler) to achieve minimum delay with zero overshot.

The following tables show the gain and auto exposure CSR.

0xF0F00820

GAIN

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
Read: read a status
0: OFF
1: ON

A_M_MODE

[7]

Write: set mode
Read: read current 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 capability is not available, 
reading this field has no meaning.

 Table 23: CSR: Gain