Using the I2S in same time with a camera using the i2C

Autonomous Machines Jetson & Embedded Systems Jetson Nano
1

Hello!

Sorry i’m a newbie in all of that, hope it’s not a problem.

I’m using an embedded camera (from e-con systems) wich is plugged on J49 (CAM1)
to use it i’ve downloaded the software provided by e-con systems and it works great.

I’m using too an ADC for audio input which uses I2S protocol.
when i’m modifiying pin configurations with “jetson-io.py” to reconfigure pins in i2s4, the camera stop working.

Does anyone have an answer to this? :/

thanks in advance for your answers and sorry for my bad English!

3

Sorry for the late response, our team will do the investigation and provide suggestions soon. Thanks

5

thank you for your answer @kayccc,

I’ve searched a bit on my side to find the answer and this is what i found:

  • To enable I2S and use the camera in the same time I have to add support in device tree overlay
  • I have to create a .dts file and compile it to add it to the dtbo

Unfortunately, on the NVIDIA site which explains how to do so:
https://docs.nvidia.com/jetson/archives/l4t-archived/l4t-3261/index.html#page/Tegra%20Linux%20Driver%20Package%20Development%20Guide/hw_setup_jetson_io.html#wwpID0E03B0HA

I can’t find the “jetson-header-name property values” for the CSI of a Jetson nano

If i’ll find answers, i’ll update this post!

7

please try using Jetson TX1/TX2 CSI Connector .

8

thanks @JerryChang for the anwer, unfortunately it doesn’t work
here is my .dts file:

/dts-v1/;
/plugin/;

/{
overlay-name = “Overlay Jetson Nano”;
jetson-header-name = “Jetson TX1/TX2 CSI Connector”;
compatible = “nvidia,p3449-0000-b00+p3448-0000-b00”;

    fragment@0 {
            target-path ="/";
            __overlay__ {
                    my-custom-property = "This is my overlay";
            };
    };

};

and here is the error when i tried to applied this overlay:

Traceback (most recent call last):
File “/opt/nvidia/jetson-io/config-by-hardware.py”, line 125, in
main()
File “/opt/nvidia/jetson-io/config-by-hardware.py”, line 117, in main
dtbo = configure_jetson(jetson, header, hw)
File “/opt/nvidia/jetson-io/config-by-hardware.py”, line 55, in configure_jetson
% (hw, header))
NameError: No configuration found for Overlay Jetson Nano on Jetson 40pin Header!

how can i go further? maybe the .dts has an error?

thanks in advance for your help!

9

hello vladimirromensky4,

please try have another try with… jetson-header-name = "Jetson Nano CSI Connector".
thanks

10

Hello again @JerryChang !
i’ve changed the jetson-header-name, but same error…

user@jetson2:~$ sudo /opt/nvidia/jetson-io/config-by-hardware.py -n “My Jetson Overlay”
Traceback (most recent call last):
File “/opt/nvidia/jetson-io/config-by-hardware.py”, line 125, in
main()
File “/opt/nvidia/jetson-io/config-by-hardware.py”, line 117, in main
dtbo = configure_jetson(jetson, header, hw)
File “/opt/nvidia/jetson-io/config-by-hardware.py”, line 55, in configure_jetson
% (hw, header))
NameError: No configuration found for My Jetson Overlay on Jetson 40pin Header!

if you think there is another way i’ll be glad!
i’ll try other header names!
maybe should I add something in the “fragment” part?

best regards…

12

hello vladimirromensky4,

you should create a file named my-overlay.dts on the target platform, the file should also contain the property, overlay-name = "My Jetson Overlay"; after that, please compile the DTS source file into an overlay file, my-overlay.dtbo, and place it under /boot/, then python script, config-by-hardware.py -n "My Jetson Overlay" should recognize the file.

14

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