Marco Awater

FEC Driver for 5200

Discussion created by Marco Awater on Apr 12, 2006
Latest reply on Mar 25, 2008 by Soenke Hanses
I'm trying to implement an FEC driver for the MPC5200. I'm running into some problems with the BestComm. I'm using rtos image 1, with just the FEC tx and rx tasks enabled. I'm using the BestComm API.
Quite frequently, the transmit task seems to get stuck. When this happens, it no longers moves data to the FEC transmit FIFO from it's buffer descriptors. The receive task continues to function. If the software doesn't receive any Ethernet data, the bug does not occur (or becomes VERY rare).

Stopping the task and resetting the buffers doesn't have any effect.
Manually setting the status of all buffer descriptors to the ready state and a size for debug purposes has shown that the transmit task doesn't change these states, ever, after the bug occurs.
As far as I can tell, I never receive a TEA interrupt, the FEC is still enabled and the FEC FIFO's are fine.
What's happening? Is this a known bug in this task image? What should I be looking at?

There didn't appear to be a forum for 32-bit processors, so I posted the message in this forum.

Message Edited by Khouri on 04-12-200609:45 AM