USB superspeed peripherals Forum Discussions

[MJ]

Hi I'm trying getting video image through CX3 MIPI.

I'm using e-con denebola RDK.

And I can get a video data from camera but it's not what I expected.

Some parts of image are fine but others are not.

My firmware is custom firmware based on bulksrcsink because I don't use this device as an UVC descriptor.

Also I used pre-defined CX3 configuration for ov5640 image sensor so I didn't change any value.

PC program that I checked image is my company's custom program.

I attached c code and some images.

How can I solve this problem?

[AliAsgar]

Hi,

The configuration looks fine. From what I see in the image, I think there seems to be loss of data.

Could you check with wireshark traces if every video frame has the same number of bytes?
Also please share the UART debug logs.

Is the device bound to cyusb3.sys driver?

Does the issue occurrence depend on activity on the other USB endpoints?

Best Regards,
AliAsgar

[MJ]

I checked every frame has the same number of bytes.

Unfortunately, I don't have a cable for UART so I couldn't get the debug logs.

And it's not bound cyusb3.cyc driver, it's using my company's driver.

I didn't checked it on other USB endpoints.

But during the test I found some curious thing.

I attached 2 images. One is captured on USB3.0, another is captured on USB2.0.

Images are slightly different, is it related problem?

The frame size is 720x1280 on program and it can be modified with any size.

[AliAsgar]

Hi,

I suspect a data loss issue.
Could you send a custom frame with incrementing values for every pixel?

1st pixel - 0x00, 2nd pixel - 0x01, 3rd pixel - 0x02 and so on.
Please trace the USB lines using Wireshark during this test and share with me the trace.

Best Regards,
AliAsgar

[MJ]

Hi,

I attached some frame images and packet data.

I used another packet monitoring program not Wireshark though.

I checked image and packet data, it was different a lot.

I agree with your opinion that has data loss.

But I don't know exact reason for this.

What about your thoughts?

[AliAsgar]

Hi,

Are the register settings for the OV5640 sensor being taken from the library provided with the FX3 SDK, or did you get the registers settings from the vendor and manually setting it in the firmware?

Could you please share the firmware project folder as well as your host utility to us to try to reproduce the issue at our end?

Best Regards,
AliAsgar

[MJ]

Hi,

The registers are set by library from FX3 SDK.

And I attached host program and firmware.

If you have any ideas or questions, please let me know.

Thanks.

[AliAsgar]

Hi,

Could you also share your company's driver for binding the device?

Best Regards,
AliAsgar

[MJ]

Hi,

The driver is in the folder with program.

[AliAsgar]

Hi,

I had tried with the driver in the folder, but below is the error I faced, there is no AMD64 folder in the host_program folder you sent.

Best Regards,
AliAsgar

[MJ]

sorry, I attached driver again.

[AliAsgar]

Hi,

I was successfully able to bind the device to the driver. It enumerated as a Biometric device with the name "integrated biometrics fingerprint scanner".

However, no product came up in the host application when I opened the application. Not sure how to view the video stream from the host application. Could you let me know if I am missing any step, or how to solve this issue?

Best Regards,
AliAsgar

[MJ]

Hi,

When you open the program, there will be a product list like below if the device is connected to PC.

And if you click the "Start Capture" button, video stream would start.

Thanks.

[AliAsgar]

Hi,

I am not able to see any product listed

Best Regards,
AliAsgar

[MJ]

Hi,

you are using denebola RDK right?

If this problem happen again and again, please connect the USB hub between PC and device.

Thanks.

[MJ]

or may be it would be because of CyU3PUsbLPMDisable() function.

I removed CyU3PUsbLPMDisable in the CY_U3P_USB_EVENT_SETCONF.

I guess that's the reason.

[AliAsgar]

Hi,

I found one issue in the GPIF callback. With FX3 SDK 1.3.4, we use GpifControlSwitch to switch socket and not call gpifsmswitch API. Now I able to see video (color bar) but with discrepancy at the bottom. I am trying to find the cause of the remaining issue. I am working on it. I will keep you updated.

Best Regards,
AliAsgar

[MJ]

Hi, thanks for your work!

Is discrepancy random? Or does it always appear at the bottom?

Anyway it helped a lot.

[AliAsgar]

Hi,

Most of the time it appears at the bottom.

But sometimes I see there is data loss happening.

I am investigating the issue. I will let you know If I have updates.

Best Regards,
AliAsgar