Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
20 years ago

Nios-II SOPC UART delivers wrong bytes

We use the UART in our Nios-II design that comes with Quartus 5.0SP1 and Nios-II 5.0 We face the problem that sometimes the Uart reports wrong RX Bytes from correct RX streams. The serial str...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
19 years ago

Have you checked the UART status register to see if there was some sort of receive error such as receive overflow or parity bit error...

Also you should check out the FIFOed UART in the projects section. I was having similar problems and found it was due to the processor not serviceing the UART fast enough. At low speeds a 16 byte fifo will solve your problem I think. You might try a deeper one though especially since you are running an OS.