Hello,
There are two USB connectors in the freedom board, so , I'm not sure which one you use.
As I'm not sure which example you are using, I'll try to help you in a general way, it is most likely that you won't be able to use the semihosting in the demo due to the timings of the software stack.
Usually when you use the semihosting there are some extra timings and resources used that might be affecting the flow of the wireless stack.
Sorry for the inconveniences this might cause you.
Regards,
Estephania