My working condition is inside a underground garage, which is darker than other cases. So i want to manually increase the exposure or increase gain of MIPI camera. I tried the following command
v4l2_test -c 1 -p 0 -F 0 -f 0 -D 0 -R 1 -r 2 -d 2 -N 1000 -n 800 -w 0 -e 4 -I 1 -b /dev/fb0 -v /dev/video0
After running the command, the image becomes brighter shortly, then it goes dark as nothing changed.
I tried to change some parameters but the image is till dark as before.
How can i manually increase the exposure or gain ? Any documents for v4l2_test ? Thanks.