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STR711FR2 USB Virtual Com Port IAR *HELP* needed.

Question asked by fielding.simon.001 on Apr 8, 2014
Latest reply on Apr 16, 2014 by fielding.simon.001


I have been looking at implementing USB VCP on a STR711FR2. I have downloaded the str71x demos from ST. I have built the project and got it running but when I plug into the USB port I get “Unknown Device”

The board did not have a pull up on the D+ line so I have added one,  the micro has a 4Mhz xtal going to pin 19 (CK) and a 32.768Mhz between 22 (RTCXTO) and 21 (RTCXTI).

Any help appreciated.