From which register, I can know the camera is online?

Autonomous Machines Jetson & Embedded Systems Jetson AGX Xavier
1

My xavier board version is R32.3.1 and the cameras is connected to the board via MIPI. I want to know whether the camera is online or not. Can you point out the register of MIPI to get the status of the camera?

3

There’s no REG for this. But you can have v4l2-ctl --list-devices to list the devices.

4

I have list the devices, but the the devices which the camera is not online is also listed.Do the MIPI have the frame count REG when there is data in?
Thanks

5

You should check the sensor REG to check if the sensor is present or not.

6

There is a state that no camera is existed and only csi clock and data is connected with Xavier.
I try to get the value of VI_CSIMUX_STAT_FRAME_0. I try the command ./reg 0x15c144a4 and ./reg 0x15c054a4, and kernel all crashed. (the reg is get from Accessing registers from Linux).How can I get the value of the reg VI_CSIMUX_STAT_FRAME_0?

7

You can’t access those VI REG with some power gate enable/disable.
Also there’s no any NVCSI/VI/ISP REG able to know if the sensor is online or not.

8

If there is no input from the data line of csi and we have operation on the /dev/video*,the xavier of version 32.3.1 will crashed. How can I work around it?

9

Make the input available would be the only solution.

11

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