USB interrupt issue after NVIC System Reset on STM32F411CCU6TR

[SAlug.1]

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

 

Please support to fix this.

[waclawek.jan]

Remove R3.

JW

[SAlug.1]

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

[gbm]

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.