zynq usb host vbus no +5v output

zynq usb host vbus no +5v output

Home Forums USB Device & Host zynq usb host vbus no +5v output

This topic contains 1 reply, has 1 voice, and was last updated by  mike tran 2 weeks, 2 days ago.

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  • #27800

    mike tran
    Participant

    Hi UCOS,

    Micrium_Xilinx_Repo_1_43, vivado/sdk 2017.4, zedboard, hdl-hdl_2018_r1

    I am testing “ucos usb host msc” example project with ucos_v1_43 on zedboard. The vivado design is borrowed from https://github.com/analogdevicesinc/hdl/releases/tag/2018_r1

    I shorted the jumpers of JP2 and JP3 according to <<ZedBoard_HW_UG_v2_2.pdf>>, however “ucos usb host msc” still cannot drive out vbus +5v, therefore, the host msc would not function (expecting to write a file on usb memry stick and read it back for double check).

    Then, I connected zedboard usb port to a powered hub, and plugged usb memory stick into the hub. This time, “ucos usb host msc” worked as expected.

    looking through the repository, only one file contains vbus information.
    /ucos_v1_43/ucos/components/ucos_usbh/src/bsp/usbh_bsp_zynq_ehci.c

    quote:
    “(3) On ZedBoard, Vbus 5V Enable is controlled directly on the board via the jumper JP2.
    This jumper must be shorted. No need to enable Vbus through a I/O.”

    However, my test shows that there is no vbus +5v output even after shorting the jumper JP2.

    Please advise, thanks in advance.

    Mike

    • This topic was modified 2 weeks, 4 days ago by  mike tran.
    #27817

    mike tran
    Participant
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