fix the beam angle of xvf3500

[jiyuanballast]

Hello gays:

I just have a xvf3500 demo board. and I want to set this board to a fix beam angle for capture the specify ROI.
as I have debug several days, I find that, when I freeze the beam (XBECLEAR_FREEZEONOFF = 1,XBECLEAR_FSBFREEZEONOFF = 1)no matter what I change the parameter of XBECLEAR_BEAMANGLE , it is always fix in 90degree. but I just want 45degree.
the Parameter I set is follow:
XBECLEAR_FREEZEONOFF 1
XBECLEAR_BEAMWIDTH 0.2588f
XBECLEAR_BEAMANGLE 0.7071f
XBECLEAR_FSBFREEZEONOFF 1

ps:the VAD is disable.

So, my question is, how to fix a beam angle for voice capture?

thankyou.
BR