AHD Camera

Supports input from 8 AHD cameras with aviation plug interface，Each channel supports resolutions of 720/1080p@25/30fps.

AHD Camera Connection Image

../../_images/ahd-connect.png

Firmware Update

Versions before 20230314 do not come with AHD*8 functionality by default. Check the version with uname -a；

If it does not match, burn the LPA3588; Refer to the chapter 《Upgrading Firmware with a Type-C Cable》 for the burning method.

AHD Camera Corresponding Device Nodes

AHD Device Node
AHD1 /dev/video11
AHD2 /dev/video12
AHD3 /dev/video13
AHD4 /dev/video14
AHD5 /dev/video3
AHD6 /dev/video2
AHD7 /dev/video1
AHD8 /dev/video0

Modify Test Script

Modify /rockchip-test/camera/camera_rkisp_test.sh Open camera_rkisp_test.sh，then remove the last line and add:

DISPLAY=:0.0 gst-launch-1.0 v4l2src device=/dev/video0 ! video/x-raw,format=NV12,width=640,height=480, framerate=30/1 ! fpsdisplaysink&
gst-launch-1.0 v4l2src device=/dev/video1 ! video/x-raw,format=NV12,width=640,height=480, framerate=30/1 ! fpsdisplaysink &
gst-launch-1.0 v4l2src device=/dev/video2 ! video/x-raw,format=NV12,width=640,height=480, framerate=30/1 ! fpsdisplaysink &
gst-launch-1.0 v4l2src device=/dev/video3 ! video/x-raw,format=NV12,width=640,height=480, framerate=30/1 ! fpsdisplaysink &
gst-launch-1.0 v4l2src device=/dev/video11 ! video/x-raw,format=NV12,width=640,height=480, framerate=30/1 ! fpsdisplaysink &
gst-launch-1.0 v4l2src device=/dev/video12 ! video/x-raw,format=NV12,width=640,height=480, framerate=30/1 ! fpsdisplaysink &
gst-launch-1.0 v4l2src device=/dev/video13 ! video/x-raw,format=NV12,width=640,height=480, framerate=30/1 ! fpsdisplaysink &
gst-launch-1.0 v4l2src device=/dev/video14 ! video/x-raw,format=NV12,width=640,height=480, framerate=30/1 ! fpsdisplaysink

If testing a single AHD channel, be sure to execute with sudo:

sudo gst-launch-1.0 v4l2src device=/dev/video11 ! video/x-raw,format=NV12,width=640,height=480, framerate=30/1 ! fpsdisplaysink

Validate Test Script

sudo /rockchip-test/camera/camera_rkisp_test.sh

Successful execution result:

neardi@LPA3588:~$ sudo /rockchip-test/camera/camera_rkisp_test.sh
Start RKISP Camera Preview!
Setting pipeline to PAUSED ...
Pipeline is live and does not need PREROLL ...
Pipeline is PREROLLED ...
Setting pipeline to PLAYING ...
New clock: GstSystemClock
Setting pipeline to PAUSED ...
...
Redistribute latency...
0:22:57.3 / 99:99:99.

../../_images/ahd-show.png

FAQ

How are the AHD camera pin definitions determined?

../../_images/ahd-spec.png

Why is there no image output from the AHD camera?

Basic Troubleshooting

  • Ensure the camera is at a resolution of 720/1080p@25/30fps.

  • Use the same resolution and frame rate for all 8 cameras; do not mix, e.g., AHD1 at 720p and AHD2 at 1080p.

  • Do not hot-swap.

  • If the firmware is self-compiled, ensure the SDK isCheck the power supply; use a DC 9-36V power source.

  • Test with Neardi’s matching camera, then compare with self-purchased cameras.

Image Capture Troubleshooting

Test with the v4l2-ctl tool for image capture:

AHD1 image capture
v4l2-ctl -d /dev/video11  --set-fmt-video=width=1920,height=1080,pixelformat=NV12  --stream-mmap=3  --stream-skip=3  --stream-to=/tmp/ahd.out  --stream-count=1  --stream-poll

Normal return result for image capture, otherwise it’s an exception:

<<<<

Is there a C++ demo?

Refer to neardi_cam_demo