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RTOS/TM4C1294NCPDT: trouble with the tm4c1294ncpdt rtos project : usbmousehost_EK_TM4C1294XL_TI_TivaTM4C1294NCPDT

Part Number: TM4C1294NCPDT

Tool/software: TI-RTOS

Hi all, 

   I use the project to test my USB peripheral.I connect a HID mouce to my USB_A slot.The mouse is fine(it works well with my windows pc).When I project starts, the led under the mouse is on and its voltage

is about 5v but the  program is blocked at the taskFxn : USBMH_waitForConnect(BIOS_WAIT_FOREVER) .I debug the code step by step and find the error  status :state == USBMH_NO_DEVICE.

I am afraid that there is something neccessary but i just neglect in my configuration.Is there some more thing before I conduct the project?

I just compile the raw project and add nothing to the file  .cfg and teh project Properties.Then I plug a HID mouse in my USB_A (VBUS, D-, D+, GND) and  debug.

I measure the voltage of my USB_A:

VBUS : 4.9, D-: 2.8V, D+: 0V, GND:0V

Could you give me some suggestions to help me slove the trouble ? eg: measure some voltage or impedance or modify some software configuration.

 

  • Hi Nancy,

    Unfortunately I do not understand your post; are you trying to debug the example application? Are you debugging your own custom HW connected to the launchpad running the example?

    Once the example is running you be able to connect a HID mouse device to the launchpad & see LED D1 light up when the primary button is pressed & LED D2 when the secondary button is pressed. Upon releasing one of the buttons the corresponding LED will turn off.

    Regards,
    -- Emmanuel