Tegra-camera-platform, position and number of cameras

Robotics & Edge Computing Jetson & Embedded Systems Jetson Orin NX
1

Hello,

I am creating a DT for 2 cameras drivers, The first DT created I am using 4 cameras connected, and the 4 cameras are working correctly

The second DT created for another driver, I am using 4 cameras connected, but I am only able to capture from 2 cameras using GStreamer, the error reported is:

Error generated. gstnvarguscamerasrc.cpp, execute:751 No cameras available

This is a summary of the tegra-camera-platform code configured:

   tegra-camera-platform {

        modules {
            module0 {
                badge = "cam1_port0";
                position = "front";
                orientation = "1";
                status = "okay";
                drivernode0 {
                    pcl_id = "v4l2_sensor";
                    devname = "cam1 42-0026";
                    proc-device-tree = "/proc/device-tree/i2c@3180000/tca9546@72/i2c@0/cam1@26";
                    status = "okay";
                };
            };
            module1 {
                badge = "cam1_port2";
                position = "front";
                orientation = "1";
                status = "okay";
                drivernode0 {
                    pcl_id = "v4l2_sensor";
                    devname = "cam1 43-0026";
                    proc-device-tree = "/proc/device-tree/i2c@3180000/tca9546@72/i2c@1/cam1@26";
                    status = "okay";
                };
            };
            module2 {
                orientation = "1";
                position = "rear";
                badge = "cam1_port3";
                status = "okay";
                drivernode0 {
                    proc-device-tree = "/proc/device-tree/i2c@3180000/tca9546@72/i2c@2/cam1@26";
                    devname = "cam1 40-0026";
                    pcl_id = "v4l2_sensor";
                    status = "okay";
                };
            };
            module3 {
                orientation = "1";
                position = "rear";
                badge = "cam1_port4";
                status = "okay";
                drivernode0 {
                    proc-device-tree = "/proc/device-tree/i2c@3180000/tca9546@72/i2c@3/cam1@26";
                    devname = "cam1 41-0026";
                    pcl_id = "v4l2_sensor";
                    status = "okay";
                };
            };
        };
    };

For the second camera I only have changed the badge, devname and proc-device-tree, but only 2 cameras are working, the camera of module1 and module3.

Doing some tests enabling only 2 cameras I have seen the I am able to capture from camera of module 0, changing the position parameter of module2

            module0 {
                badge = "cam1_port0";
                position = "front";
                ...
            };
            module1 {
                badge = "cam1_port2";
                position = "rear";
                ...
            };

But with this configuration I am not able to capture from module1.

Do you know why the position is affecting which camera works?

3

Using “bottomleft, bottomright, centerleft, centerright, topleft, and topright” for your case.

Camera position. Values supported depend on the number of cameras in the system:

  • In a two-camera system: rear and front.
  • In a three-camera system: bottom, top, and center.
  • In a six-camera system: bottomleft, bottomright, centerleft, centerright, topleft, and topright.
4

Hi ShaneCCC, using bottomleft , bottomright , centerleft , centerright as a position values for the camera 2, it solves the problem.

I have also replaced the position values of the camera 1 and is working correctly with this values too.

Now I am wondering why the camera 1 was working using the previous values.

Thanks ShaneCCC.

6

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