Posted on April 04, 2014 at 13:34Hi,
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.
Regards
Simon
