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Can we use two USB interface on DM8148 ?

Brijesh Kamani
Intellectual 600 points

I have question on USB interface of DM8148 Soc.

We found some information in Errata of DM8148 on USB interface as mentioned below: “Advisory 2.1.9 USB OTG VBUS: SRP on USB "Initial B" Device Not Supported”

Can you please confirm that can we use 2 USB interface on DM8148 configured as a host at same time? We want to use both USB interface on DM8148 as host to connect USB WIFI device.

  • 0
    TI__Guru**** 393215 points
    Hi BK,
     
    I don't see a problem here. If you read towards the end of Advisory 2.1.9 it says:
     
    "Full OTG functionality is not in place and the USB SS should not be used in an OTG environment where role changing is required."
     
    This does not concerns the USB when configured in host mode.
  • 0 in reply to Biser Gatchev-XID
    TI__Genius 11470 points

    Hello,

    Thank you very much, Biser.

    I agree, you should be able to use the two USBs in Host mode (without role changing) at the same time.

    However, recently I was informed that WIFI USB devices are not officially supported by TI in that PSP (EZSDK is based on PSP; the Linux release is included in the PSP). It is not tested nor verified by TI. Connecting WIFI USBs should probably work though, but the above means that the customers should struggle to handle possible issues themselves; no guarantees for the current implementation.

    So, please test thoroughly the WIFI USBs in the early stage of your development in order to avoid problems.

    Thank you.

    BR

    Vladimir

  • 0 in reply to Vladimir-XID
    Intellectual 600 points

    Hi Vladimir,

    Thanks for reply,

    Which USB driver you are talking about i mean is it a USB Host driver or USB Device (e.g. Mass Storage , HID , Network etc) Driver ?

  • 0 in reply to Brijesh Kamani
    TI__Genius 11470 points

    Hello,

    I guess it is about the class drivers normally located at -> Device Drivers -> Network device support -> Wireless LAN. There are the WIFI USB device drivers (and other drivers as well). On this platform WIFI USB devices and their respective drivers are not tested nor verified.

    I think that is what is the developers mean with the above warning, but however you should test the whole integrity of you system (including the WIFI).

    Thank you.

    BR

    Vladimir