fopen("/dev/uart","w") returning NULL

Hey guys,

I'm attempting to communicate between my PC to the Nios II via RS-232.
I've built up my system in SOPC and I'm using the eclipse tool to code in c.
When I use the function fp = fopen("/dev/uart","w"), I always receive NULL.
/dev/uart is the correct path according to my system.h file.

Could you offer any advice?

Thanks,
Justin

Attached Files

• nios+ii.pdf (260.0 KB)
• sopc.pdf (168.1 KB)