Microchip's TCP/IP stack is not designed to be re-entrant and is very
state machine dependent. You might have two different physical layer
applications (for the internal MAC/PHY and the external MAC/PHY), but that
does not duplicate things higher on the stack. By running two ports on one
machine, you could easily have a race and end up with the system executing
illegal code/locking up. Using a newer stack does not necessarily solve
this problem.

You may be able to carefully go through the code to have duplicate stacks
for each port (such as a tcp-port1.c and tcp-port2.c.  This will have the
stack take up a lot more memory.

FYI- Microchip just released (less than a couple hours ago) the new
version of the Microchip Applications Library, which contains v5.36 of the
TCP/IP stack.


Matt Bennett
Just outside of Austin, TX
30.51,-97.91

The views I express are my own, not that of my employer, a large
multinational corporation that you are familiar with.

On Sun, June 19, 2011 11:17 pm, Forrest Christian wrote:
> Two items:
>
> 1) Enable watchdog timer, see if that fixes it, and if so, then you need
> to figure out where it is endless looping.
>
> 2) if watchdog timer still works, you need to perhaps look at whether or
> not the Micrel phy is locking up. When you say 'push button' what is the
> button doing. Perhaps you should fix it so a button press also triggers
> a led run by the program so you can figure out whether or not it's the
> processor or something with the ethernet.
>
> I ran into a problem in an application where I had an ENC28J60 which was
> locking up when ethernet errors were encountered. Adding code to check
> the ENC state every once in a while and resetting/reprogramming resolved
> that issue.
>
> -forrest
>
> On 6/19/2011 6:33 PM, ???? wrote:
>> Dear Engineer,
>>
>>      I want to know whether TCPIP Stack v5.31 can work well or not.
>>      PIC18F97J60 is used in our products. The version of TCPIP stack we
>> are
>> using is v5.10 by 20090729, we want to update the TCPIP stack to the
>> latest
>> version to enhance network performances.
>>      The causes we want to do the update is as follows:
>>          We have two sorts of  DUTs (Design Under Test), one is with 1

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