Cypress EZUSB FX3 to stream video from OV7670

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Anonymous
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Hi community,

   

I'm following application note AN75779 to stream the raw video data from OV7670. I'm connecting the FX3 to the host USB 3.0 port, which successfully recognized it as a USB composite device, I guess that's working alright.

   

However, since OV7670 does not support 1280*720 resolution, I'm modifying the VS frame descriptor CyFxUSBSSConfigDscr in cyfxuvcdscr.c, at 640*480@30fps. Another place I modified is uvc.c, the glProbeCtrl structure.

   

Also, the frame sync vsync signal output from OV7670 is active low, so I modified the GPIF II project and override the cyfxgpif2config.h file in the eclipse project.

   

After rebuilding the solution, I reflashed the FX3, AMCap successfully regonized the video resolution as 640*480, however, the whole video screen is all blank.

   

The UART debug console output prints UVC: Completed 0 frames and 0 buffers every one second.

   

Is there anything I'm missing in here? Do you have a working code sample for such?

   

Regards!
Jackie

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6 Replies
YangyangC_06
Employee
Employee
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Hi Jackie,

   

Please check your dscr.c file again to make sure everything is correct. After that you could use oscilloscope to check if the image sensor outputs data and if FV/HV works fine.

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Anonymous
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The necessary changes to add a different resolution/frame rate is mentioned in the below link. Please make sure that you have followed the instructions. 

   

http://www.cypress.com/forum/usb-30-super-speed/an75779-modification-fx3-streaming-image-sensor-data  

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Anonymous
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Hi,

   

The page is no more available. Can you please send a copy of the same or provide another link where i can find it?

   

Thanks,

   

Ajay

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Anonymous
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Anonymous
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Hi,

Please provide the OV7670 project folder?

I hope will help me.

Thanks.

Nic

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Anonymous
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Hi ghjackie_2415896

  You said that :

"Also, the frame sync vsync signal output from OV7670 is active low."

Did the active low really work? since no matter i choose active high or low, the result are the same

because of this, I have to change the sensor vsync polarity when i initiateing it.

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