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Original question:

Linux/TDA2PXEVM: mksdboot.sh issues

Linux/TDA2PXEVM: Streaming data over USB

TG2718
Intellectual 1000 points
Part Number: TDA2PXEVM
Other Parts Discussed in Thread: AWR1243, TDA2

Tool/software: Linux

I have a TDA2PxEVM board mated to a custom board with cascaded AWR1243 radar chips. Currently we are streaming all the raw data from the EVM to a laptop via Gigabit Ethernet, but the data rate of the cascaded chips exceeds what Gigabit Ethernet can handle, so I want to use USB 3.0. Eventually we will do processing in the TDA2px, but for now we want to log and process the data on the laptop.

I was told previously that the best way to use USB is to run Linux on the A15 core. I have a Ubuntu 18.04LTS development system. I am new to USB development and would like more specific advice about the best (and easiest) way to stream data over USB 3.0 and achieve as close to the 5 Gbps theoretical limit as possible.

Questions:

  1. Is it possible/advisable to use Linux USB gadget drivers to send Ethernet traffic over USB? If so, perhaps that would minimize needed modifications to the existing code.
    1. Which is the best choice of gadget driver type to use that is supported? It appears that there are several different possible types of gadget drivers.
    2. How would I configure and use the gadget driver approach?

  2. Or, is there a better USB approach? Are custom drivers needed for the embedded or host?
  3. What practical data transfer rates should be achievable over USB 3.0?
  4. As a stopgap solution, I assume it would be easy to write to a USB SSD drive from embedded Linux? Are there any steps I would need to take to enable that (e.g. drivers to install)?

Thanks!

  • 0
    Guru 13660 points 
    Is it possible/advisable to use Linux USB gadget drivers to send Ethernet traffic over USB? If so, perhaps that would minimize needed modifications to the existing code.

    Explore the option of g_ether gadget driver. It emulates ethernet over USB and you can use that to connect to PC

    Which is the best choice of gadget driver type to use that is supported? It appears that there are several different possible types of gadget drivers.

    For streaming usecase, you can use USB UVC gadget(which will have ISO endpoints, which is in theory suited for streaming usecase). You can use g_ether gadget driver(Network overhead would be there, but minimal code change for you). You can use Mass storage gadget device g_mass_storage (CONFIG_USB_MASS_STORAGE kernel config) 

    How would I configure and use the gadget driver approach? As a stopgap solution, I assume it would be easy to write to a USB SSD drive from embedded Linux? Are there any steps I would need to take to enable that (e.g. drivers to install)?

    1. Make sure USB controller at TDA2x side configured as gadget. You can check here for example :

    2. Enable USB Mass Storage Gadget driver with kernel configuration: as mentioned in this link : linux-sunxi.org/.../Mass_storage  

    3. You can enable USB ethernet driver as mentioned here : processors.wiki.ti.com/.../Networking_over_USB

    Or, is there a better USB approach? Are custom drivers needed for the embedded or host?

    Custom drivers would take a lot of effort from both TDA2x end and the PC end. Better would be go with Mass Storage Gadget or Gadget Ethernet over USB, as mentioned above.

    What practical data transfer rates should be achievable over USB 3.0?

    Please refer here for USB performance in TDA2x : www.ti.com/.../sprac21.pdf

  • 0 in reply to Dwarakesh Radhakrishnan
    TI__Mastermind 42515 points
    This is the link to TDA2 performance document (the forum engine did not displayed it correctly in Dwarakesh's post):
    proddms.itg.ti.com/.../sprac21.pdf

    Regards,
    Yordan