STM32L476RG assert failed: endpoint busy

[tipeter]

Hi!
I have a simple project that I developed for a stm32f439zi microcontroller (NUCLEO-F439ZI card): it receives data on RS232 port and sends it to a PLC via RS232 and to a PC via USB-HID protocol.
The project uses FreeRTOS with TinyUSB stack, RS232 communication is done with DMA. It works perfectly.
I wanted to port this to stm32l476rg (NUCLEO-L476RG) microcontroller but I got stuck on USB-HID.
The application is self-powered, I use VBUS-sensing. When I connect the device to the PC, the enumeration happens; but the TinyUSB stack immediately stops with an "Endpoint Busy" error.
I have removed all "unnecessary" parts from the project, I only start the USB stack, but still this is the result.
What could be the problem? What is the status of the STM32L4 port?
Thanks in advance for your help!

[HiFiPhile]

Hi,

The capture looks pretty bad... Which version are you using ? Could you upload the full log ?

[tipeter]

Sure!
I'm using the master branch, but I also tried the 0.10.1 release.
To initialize the USB hardware I use the CubeMX function "MX_USB_OTG_FS_PCD_Init()".
I tried to use the STM32L4-Discovery initialization code in the TinyUSB examples (rewritten for the corresponding GPIOs), but VBUS-Sensing did not work.

Output of the 'lsusb':

Bus 001 Device 028: ID cafe:4004 TinyUSB TinyUSB Device

RTT log:

SEGGER J-Link V7.52a - Real time terminal output
J-Link STLink V21 compiled Aug 12 2019 10:29:20 V1.0, SN=770821829
Process: JLinkGDBServerCLExe
System initialized
USBD init
HID init
USBD Bus Reset : Full Speed
USBD Bus Reset : Full Speed
USBD Bus Reset : Full Speed
USBD Bus Reset : Full Speed
USBD Xfer Complete on EP 00 with 0 bytes

USBD Setup Received 80 06 00 01 00 00 40 00 
  Get Descriptor Device
  Queue EP 80 with 18 bytes ...
USBD Xfer Complete on EP 80 with 18 bytes
  Queue EP 00 with 0 bytes ...
USBD Xfer Complete on EP 00 with 0 bytes
USBD Bus Reset : Full Speed
USBD Xfer Complete on EP 00 with 0 bytes

USBD Setup Received 00 05 08 00 00 00 00 00 
  Set Address
USBD Xfer Complete on EP 80 with 0 bytes
USBD Xfer Complete on EP 00 with 0 bytes

USBD Setup Received 80 06 00 01 00 00 12 00 
  Get Descriptor Device
  Queue EP 80 with 18 bytes ...
USBD Xfer Complete on EP 80 with 18 bytes
  Queue EP 00 with 0 bytes ...
USBD Xfer Complete on EP 00 with 0 bytes
USBD Xfer Complete on EP 00 with 0 bytes

USBD Setup Received 80 06 00 06 00 00 0A 00 
  Get Descriptor Device Qualifier
  Stall EP0
USBD Xfer Complete on EP 00 with 0 bytes

USBD Setup Received 80 06 00 06 00 00 0A 00 
  Get Descriptor Device Qualifier
  Stall EP0
USBD Xfer Complete on EP 00 with 0 bytes

USBD Setup Received 80 06 00 06 00 00 0A 00 
  Get Descriptor Device Qualifier
  Stall EP0
USBD Xfer Complete on EP 00 with 0 bytes

USBD Setup Received 80 06 00 02 00 00 09 00 
  Get Descriptor Configuration[0]
  Queue EP 80 with 9 bytes ...
USBD Xfer Complete on EP 80 with 9 bytes
  Queue EP 00 with 0 bytes ...
USBD Xfer Complete on EP 00 with 0 bytes
USBD Xfer Complete on EP 00 with 0 bytes

USBD Setup Received 80 06 00 02 00 00 22 00 
  Get Descriptor Configuration[0]
  Queue EP 80 with 34 bytes ...
USBD Xfer Complete on EP 80 with 34 bytes
  Queue EP 00 with 0 bytes ...
USBD Xfer Complete on EP 00 with 0 bytes
USBD Xfer Complete on EP 00 with 0 bytes

USBD Setup Received 80 06 00 03 00 00 FF 00 
  Get Descriptor String[0]
  Queue EP 80 with 4 bytes ...
USBD Xfer Complete on EP 80 with 4 bytes
  Queue EP 00 with 0 bytes ...
USBD Xfer Complete on EP 00 with 0 bytes
USBD Xfer Complete on EP 00 with 0 bytes

USBD Setup Received 80 06 02 03 09 04 FF 00 
  Get Descriptor String[2]
  Queue EP 80 with 30 bytes ...
USBD Xfer Complete on EP 80 with 30 bytes
  Queue EP 00 with 0 bytes ...
USBD Xfer Complete on EP 00 with 0 bytes
USBD Xfer Complete on EP 00 with 0 bytes

USBD Setup Received 80 06 01 03 09 04 FF 00 
  Get Descriptor String[1]
  Queue EP 80 with 16 bytes ...


  HID opened
USBD Xfer Complete on EP 80 with 0 bytes
USBD Xfer Complete on EP 00 with 0 bytes

USBD Setup Received 80 06 03 03 09 04 FF 00 
  Get Descriptor String[3]
  Queue EP 80 with 14 bytes ...
USBD Xfer Complete on EP 80 with 14 bytes
  Queue EP 00 with 0 bytes ...
USBD Xfer Complete on EP 00 with 0 bytes
USBD Xfer Complete on EP 00 with 0 bytes

USBD Setup Received 21 0A 00 00 00 00 00 00 
  HID control request
  Queue EP 80 with 0 bytes ...
USBD Xfer Complete on EP 80 with 0 bytes
USBD Xfer Complete on EP 00 with 0 bytes

USBD Setup Received 81 06 00 22 00 00 43 00 
  Get Descriptor  HID control request
  Queue EP 80 with 64 bytes ...
USBD Xfer Complete on EP 80 with 64 bytes
  Queue EP 80 with 3 bytes ...
USBD Xfer Complete on EP 80 with 3 bytes
  HID control complete
  Queue EP 00 with 0 bytes ...
USBD Xfer Complete on EP 00 with 0 bytes
USBD Xfer Complete on EP 00 with 0 bytes

USBD Setup Received 21 09 01 02 00 00 02 00 
  HID control request
  Queue EP 00 with 2 bytes ...
USBD Xfer Complete on EP 00 with 2 bytes
  0000:  01 01                                            |..|
  HID control complete
  Queue EP 80 with 0 bytes ...
USBD Xfer Complete on EP 00 with 2 bytes
  0000:  01 01                                            |..|
  HID control complete
  Queue EP 80 with 0 bytes ...
usbd_edpt_xfer 1250: ASSERT FAILED

Thanks!

[hathach]

please post log as attached txt file, long log make following discussion more difficult. L4 isn't supported yet, although it pretty much uses the very same controller to other stm, there is something special about them that I haven't got time to resolve yet #126 .

[lachlanm-git]

This may or may not help but had basically the same error when getting a project going in TrueStudio with STM32L476Disco.
My main issue turned out to be that I was wrongly targeting /portable/st/synopsys. Fixing this to target /portable/synopsys/dwc2 resolved my issue.

[hathach]

as @lachlanm-git response, L4 is now supported by #1163 with dwc2 driver