[En-Nut-Discussion] Problem with missing TCP Zerowindow / ACK

[Jesper Hansen]

Problem solved.

I had visually verified my code against the ARM version of the AX88796 
driver, and in NicInterrupt, NutEventPostAsync is used to wake up the 
nic thread.

This does NOT work on my AVR board.

I changed to NutEventPostFromIrq and it worked perfectly. (This is also 
how it's done in the RTL driver, God knows how and when that came to be 
a NutPostAsync).


But I noted a peculiarity when playing around with the AX88796.
I'm using it in ISA mode, and the datasheet says interrupts are then 
active high.

 From the DS : "Interrupt Request : When ISA BUS or 80186 CPU mode is 
select. IREQ is asserted high to indicate the host system that the 
chiprequires host software service."

Well, not on my devices! I have several boards and they're all having an 
active low interrupt, so it's not just a bad chip.
Anyone else observing the same ?


/Jesper

Harald Kipp skrev:
> Jesper Hansen schrieb:
>> NutNet suddenly does not respond to packages sent by the host.
>> There can ofcourse be a zillion reasons to that, driver issues etc, (I'm
>> using the AX77896), but it could also be a problem with the TCP stack.
>>   
> Possible the NIC is corrupted and stops passing packets to the CPU. As a 
> first try reset the NIC and see if the data flow continues.
> 
> Harald
> 
> 
> _______________________________________________
> http://lists.egnite.de/mailman/listinfo/en-nut-discussion