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tm3341
tm3341
Associate III
December 18, 2016
Question

STM32CubeMX USB Device generator bug

  • December 18, 2016
  • 2 replies
  • 1633 views
Posted on December 18, 2016 at 21:16

Today I played with CubeMX and USB CDC device and I found very silly bug in generated code.

I chose USB FS Device only mode and I used CDC class. Nothing else set. I did not enable VBUS.

Generated code enabled VBUS sensing but VBUS sense pin was not enabled.

I spent 2 hours to figure that out.

Please correct this mistake, disable VBUS sense by default or if you enable VBUS sense, then also initialize VBUS pin to sense voltage.

Have a nice day.

#stm32f7 #stm32cubemx #usb
This topic has been closed for replies.

2 replies

I
Imen.D
Technical Moderator
December 21, 2016
Posted on December 21, 2016 at 10:39

Dear

Majerle.Tilen

‌,

Which CubeMx version are you using ?

Best Regards

Imen

"When your question is answered, please close this topic by clicking ""Accept as Solution"".ThanksImen"
tm3341
tm3341Author
Associate III
December 21, 2016
Posted on December 21, 2016 at 11:11

Latest, 4.18.

I
Imen.D
Technical Moderator
December 21, 2016
Posted on December 21, 2016 at 13:47

Hello

Majerle.Tilen

‌,

I have checked and reproduced this casefrom my side.

I will share internally your feedback for further review and we will keep you informed about the taken actions/explanation if needed.

Thank you for your contribution.

Best Regards

Imen

"When your question is answered, please close this topic by clicking ""Accept as Solution"".ThanksImen"
Frantz LEFRERE
Frantz LEFRERE
ST Employee
January 3, 2017
Posted on January 03, 2017 at 17:08

hello majerle,

FYI : there are two types of vbus available:

1- External Vbus (External Pin)

2- Internal Vbus

By default the internal VBUS is enabled -> this is your case

To disable it, go to tab Configuration in CubeMX and open the USB configuration window, now you have to select disable for Vbus sensing parameter.

best regards,

Frantz

Bill Lewis
Bill Lewis
Associate III
April 20, 2017
Posted on April 20, 2017 at 20:25

I have run into this also, thanks god for your post!

I run STM32CubeMX version 4.20.1 and don't have a setting in the USB on Configuration tab.

I had to edit the code by hand to fix, in USBD_LL_Init():

   hpcd_USB_OTG_FS.Init.vbus_sensing_enable = DISABLE;

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