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MRAFI.376
MRAFI.376
Associate
October 22, 2019
Question

Custom USB Device: "Unknown device (device descriptor request failed)" error in Windows

  • October 22, 2019
  • 2 replies
  • 1039 views

I'm using STM32L073RZ on my own board, and I am trying to program USB device (I tried virtual COM and HID, separately).But after plugging into PC it is detected (after a while) with "Unknown device (device descriptor request failed)" error in windows 1

Electrically (PCB):

I think that PCB is not an error here - I just have D+ and D- short tracks from the connector to the uC and that's all.

I have a pull-up 1.5k (I tried with and without it), but it is not even needed in STM32. I have check connection and a cable and I'm certain it connects.

 

Code:

I'm using HAL and STM32CubeMx generated code merged with my project

 

 

is this a software or hardware issue?

This topic has been closed for replies.

2 replies

Tesla DeLorean
Tesla DeLorean
Guru
October 22, 2019

If it is a part supporting the ROM System Loader, and USB DFU, try pulling BOOT0 high, and reset/connect as a DFU device, should report "STM32 in DFU Mode" or somesuch.

On your board make sure you're using a crystal oscillator, that it starts, and the speed and HSE_VALUE are consistent.

Try also on known hardware like an EVAL board, or LORA-DISCO board

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    MRAFI.376
    MRAFI.376Author
    Associate
    October 23, 2019

    Thank you for your replay

    I just try STM32 DFU USB class but it not working in STM32L073RZ nucleo board

    why its not working in this development board?. I am using an external crystal oscillator of 8 MHz later i change usb clock configuration to 48 MHz internal USB clock but its not working

    Later I use to STM32Cube L0 example code (USB CDC standalone application code for STM32L073Z eval board code) it is not working nucleo board

    is this a Hardware or Software issue?

    how do i solve this ?

    I am using STM workbench as IDE

    in Nucleo Boad VBUS is already connected to 3.3v through 0 ohm resistance ,I am not using any series resistance with D+ and D- line is there any issue with this Hardware configuration

    I am also tried Ubuntu 18 os result is same as in windows OS

    is there any Reference of USB hardware specifically for STM32L073Z nucleo development board

    DCull.1
    DCull.1
    Associate
    February 3, 2020

    Hi,

    I am also using the NUCLEO-L073RZ eval board and I am experiencing similar problems.

    I create a USB CDC project with CubeMX and have connected a USB cable to pins 12 ,14 and 20 GND on the morpho connector CN10.

    I also have not connected VBUS from the USB cable.

    When I plug the USB cable in I get Device Descriptor Request Failedon my PC ( win 10 ).

    I have ordered a different eval board (STM32L073Z-EVAL ) that has built in USB connector and a specific project for USB CDC on the peripheral, not through the ST-LINK USB. ( I hope !! ). Going to try to get this going then compare to L073RZ.

    Regards.

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