I was having difficulty getting the UART example working from the
CMSIS driver interface on a newly purchased MCBSTM32F400 eval board.
After trying a number of random fixes I tried swapping the port
select jumpers and it worked. The example code uses USART 3, and
according to the silkscreen on the board I had to move the select
jumpers from port 3/4 to port 1 to get USART 3 to work, which was a
little confusing. The schematics also show port 3 selected by
default, which did not seem to
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