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am3354: USB serial gadget problem

andre feng
Expert 1060 points

Part Number: AM3354
Other Parts Discussed in Thread: AM3354

Hi ，

SDK: ti-processor-sdk-linux-rt-am335x-evm-03.03.00.04-Linux-x86-Install.bin

Main chip ： am3354

Device tree : am335x-boneblack.dtb

Board is customized by our company.

Use the USB virtual serial port function to load the drive sequence:

modprobe g_ether
modprobe g_serial

 When I open the serial debugging assistant, it will receive debug (UART0) port information. As shown below:

Why is there a debug (UART0) port message when using the g_serial driver ? 

How can I not receive the debug (UART0) port message when using the g_serial driver?

  • 0
    TI__Guru**** 175471 points

    Andre,

    andre feng said:

    Use the USB virtual serial port function to load the drive sequence:

    modprobe g_ether
    modprobe g_serial

    Can you please explain what is the "USB virtual serial port function" means?

    You loaded two USB gadget drivers, do you configure both AM335x USB ports to be peripheral mode? If so how do you connect them to the USB host?

    andre feng said:
    Why is there a debug (UART0) port message when using the g_serial driver ? 

    I have no idea, this is the first time I see "ELMO GMAS", not sure how it is created. Are both ELMO GMAS (COM9) and USB Serial Port (COM5) created at the same time when you do "modprobe g_serial"?

    Do you have the same issue when connect to Linux USB host as well?

  • 0
    TI__Guru**** 175471 points
    Andre,

    I haven’t heard back from you, I’m assuming you were able to resolve your issue. If not, just post a reply below (or create a new thread if the thread has locked due to time-out). thanks.