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[VCP] Virtual Com Port on STM32L4

Question asked by ca.pwl on Aug 5, 2015
Latest reply on Aug 5, 2015 by Amel N
Hello, I am using STM32L4 uC and I'am trying to create a Virtual Com Port. My problem is that computer does not recognize device after running it (I can only see "Unknown device" message).

Here is how I configure timer:
PLLM = 1;
PLLN = 36;
PLLP = 7;
PLLQ = 6;
PLLR = 2;
which should give me frequency of 48MHz for USB.

As far as I know the "Unknown device" problem is related to wrong timer configuration so there is a question - do I configure timer correctly? If yest then what may cause the problem?