System Workbench for STM32

What does not work?
Is the ISR not being called?
Is the wrong character being received?
Can you look at the signal from the sending board with a scope to make sure that it is correct?
Are you sure that the BAUD rates on both boards are the same and are correctly set up.
(I've not used these boards mysefl but these questions are te ones I often ask when we are not really told enough to be of immediate assistance.)
Susan