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usb host device: Babble Interrupt Occured

samir weng
Prodigy 60 points

we connect host port to my pc, and will display follow message in console

ti81xx_interrupt 884: CAUTION: musb0: Babble Interrupt Occured
ti81xx_interrupt 885: Please issue long reset to make usb functional !!
musb_stage0_irq 840: unhandled DISCONNECT transition (a_idle)
ti81xx_interrupt 977: Babble: devtcl(99)Restarting musb....
evm_deferred_musb_restart 839: deferred musb restart musbid(0)
ti81xx_interrupt 884: CAUTION: musb0: Babble Interrupt Occured
ti81xx_interrupt 885: Please issue long reset to make usb functional !!
musb_stage0_irq 840: unhandled DISCONNECT transition (a_idle)
ti81xx_interrupt 977: Babble: devtcl(99)Restarting musb....
evm_deferred_musb_restart 839: deferred musb restart musbid(0)

Could you tell me what is the wrong?

  • 0
    TI__Expert 7885 points

    Samir

    The babble condition shows electrical disturbance or signal integrity issue on usb bus. Is this custom board or TI-EVM ? what is PSP release version used?

    Regards

    Ravi B

  • 0 in reply to Ravi B
    Prodigy 60 points

    Thanks for your reply

    It found in my custom board. but if don't jump ID pin to ground, the TI-EVM board also found the issue.

    If we jump ID pin to groud, TI-EVM board is ok.

    Does the issue caused by ID pin floating?

    our Board doesn't reserve to jump ID pin, so we can't test now. we wil test in next build.

  • 0 in reply to samir weng
    TI__Expert 7885 points

    If your board does not have Jumper to short the USBx_ID pin, You can use cable type connected to EVM to configure USBx_ID pin. Connect micro/mini-A to A receptacle for host mode and mini/micro-B cable tyep for device. Connect the appropriate cable type before loading the kernel image. For more information refer USB Users Guide at http://processors.wiki.ti.com/index.php/DM81xx_AM38XX_USB_User_Guide#USB_ID_configuration_for_DM814x