Multiple CSI cameras on tx1 and virtual channel id

Autonomous Machines Jetson & Embedded Systems Jetson TX1
1

Hi,
I want to hook up Serializer-Deserializer(SerDes) to TX1 CSI port.
3 cameras will be connected to SerDes and data streams of 3 cameras are time-division multiplexed and go into TX1 CSI-0(A+B).
SerDes has 4-lane mipi output.

As far as I know, in this case, each pixel stream can be distinguished by virtual channel id.
In SerDes side, I can assign virtual channel id to each pixel stream.
But in TX1 side, I have looked into host driver source code but I don’t know whether tx1 can support multiple pixel stream via one csi port.

does anyone give me the answer?

thanks!!

2

Can I get more detail information about “multiple pixel stream” ?

3

Hi,
“pixel stream” means single camera output(UYVY format). and what i mean “multiple pixel stream” is multiplexed 3 cameras’ output. The deserializer receives 3 cameras’ outputs simultaneously and multiplex them by a line data unit and output through 4-lane port.

4

I believe most of the deserializer are package multiplexed as single one frame like a single camera and that won’t got problem to support it.

5

Yes, right. But I want to separate each frame from multiplexed large one and transmit them to each destination(ex: Gstreamer recording 1,2,3). And to do this, i think, video devices should be opened separately (/dev/video0, 1, 2).
i wonder it is possible on current tx1(my version is r24.2.1).
Or do i have to modify host driver code?

6

Hi sung-ho
TX1 VI/CSI not support your use case. The only way is post processing to clip it.

7

Hi,

We will be working on the VCID Support, we had another post were we were asking NVIDIA about it:

https://devtalk.nvidia.com/default/topic/1009457/tx1-i2c-csi-2-quad-camera-input/?offset=16#5210831

Have you made progress on this? I am not sure if with the documentation available is enough to get it working but will give it a try.

8

Hi DavidSoto
We had stopped developing SerDes I/F and VCID support, so didn’t make any progress on it.

I can’t assure but when i saw tx2 r28.1 driver code and TRM, it seemed that there were some update for virtual channel id related.

9

Thanks for the update, I will check it

10

We were able to get the OV10640/OV490 + MAX92705 and MAX9286 working, we are looking into the Virtual Channel ID on TX2 and we will let you know our findings

11

@DavidSoto
About Virtual Channel ID support on TX2, Do you have any updates?

12

Hi @limiao, not update on this, we were basically waiting the VCID support for Xavier but has not been released yet.