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USB VCP - cannot open COM Port

Question asked by Pfeffer.Daniel on Feb 1, 2016
Latest reply on Feb 17, 2016 by Pfeffer.Daniel

I am using USB Virtual Com Port with CubeMX on a STM32F4 controller.

The problem is, that occasionally, but increasingly often I cannot open the COM Port to my Device. It is very hard to reproduce, as changes in completely different code regions can cause that behaviour. 

The port is enumerated in my device manager, but the connection from a terminal program fails.

What are the possible reasons for this (ram, interrupt-interference, ...)?

Are there any general guidelines for a "robust" USB Virtual Com Port?