FAQs
cancel
Turn on suggestions
Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type.
Showing results for 
Search instead for 
Did you mean: 

USB interrupt issue after NVIC System Reset on STM32F411CCU6TR

SAlug.1
Associate II

‎2022-03-30 02:52 AM

A PC app sends a reset command via USB. In the main app I use HAL_NVIC_SystemReset() to reset the board. If I use HAL_NVIC_SystemReset, windows loses USB com port and does not re-enumerate port unless I plug out and plug in USB cable.

The PC app talks to USB virtual com port.

Schematics

0693W00000LwFudQAF.png0693W00000LwFvvQAF.png 

Please support to fix this.

Labels:
0 Kudos
3 REPLIES 3
waclawek.jan
Guru

‎2022-03-30 05:19 AM

Remove R3.

JW

0 Kudos
gbm
Lead III

‎2022-03-30 06:17 AM

Also make sure that USB peripheral is not activated immediately after reset, Windows correctly re-enumerates USB device if it is disconected for at least some minimum time. Try to delay 20..100ms before enabling USB. 20ms delay works for me.

My STM32 stuff on github - compact USB device stack and more: https://github.com/gbm-ii/gbmUSBdevice
0 Kudos
SAlug.1
Associate II
In response to waclawek.jan

‎2022-03-30 10:28 AM

We have Remove R3 register and the USB enumeration is happening after issue NVIC_SystemReset(). Thanks for the help

0 Kudos
Top