Hello Yosuke

I did not keep the correspondance with Leonard so must work from memory.

If I recall this properly the problem was with trying to set breakpoints 
within both an input and output interrupt service routine.

Basically the host communications are also an interrupt service 
routine.  This means that if the host interrupt is blocked data will not 
be communcated back to the debugger program on the PC.

You could also have a problem with stack overflow.  If for example the 
input interrupt is reenabled within the ISR before the debugger 
breakpoint a new (input) interrupt will occur every time a debug 
operation occurs.  This will quickly eat up the stack.

Best regards
Keith
-------- Original Message -------- Subject: [c3x] DSK3DW error
Hi people, i'm new in this group

Now, im working with VC33 University DSK and i have just tried a sample 
program posted by this group, basicaly newleonardo2004's code(signal 
loopback) with all fixes found also in this discussion, but always got 
the same problem when i execute Freerun. The next are the error message 
that appeared:

*A communication error has ocurred Attemping to Reinitialize Board 
DSK3DW will exit if initialization fails
*Host Port Communication Error Check...

I put a audio signal into board and continued the procedure but the 
effec is some hearable noise from output.

So i probed with single step execution and the loaded code run normally. 
if someone have suggestion to fix this problem advice to me.

many thanks, Yosuke