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TCP packet filled with 'U' 1392 bytes long

Aswin C.

Hi,

I'm trying the RL-ARM tcp/ip stack on a arm7 LPC2368 from ETT (futurlec).
I succeed setting up a TCP listen socket with the EasyWeb API.
But when I try to use the TCP stack from RL-ARM 4.12 I don't succeed.

When the controller goes online, it send one packet (ARP notify) and it is filled with 'U' (55) the whole frame/packet, 1392 bytes long.

If I try to setup a TCP connection from my controller to the PC.
several packets as described above appear.

Any idea?

Kind Regards.

  • 0 in reply to IB Shy

    because an arp request should be around 60bytes...
    ok thank you.
    Will keep you posted... tomorrow evening.

  • 0 in reply to Aswin C.

    Hello All,

    I tried the debugging but I wasn't going anywhere with it.

    I have tried the example in 'C:\Keil\ARM\Boards\Keil\MCB2300\RL\TCPnet\LEDClient'
    And that worked. (after deleting LCD stuff )

    I created a new project.
    then add all the files that the example uses. (same path, didn't copy them..)
    didn't work either...

    aperently LPC23_EMAC.c has specified options...
    Memory Assignment:
    Code <Default>
    Zero Init Data: IRAM2
    Other DATA: IRAM2

    After setting those, everything worked.

    Why is that ?
    How did I suppused to know this ?

  • 0 in reply to Aswin C.

    In case the ethernet code is making use of DMA, then the buffer memory must be in the RAM region supported by the DMA controller. Note that the processor have multiple memory controllers, to allow concurrent access to different RAM regions - so a DMA transfer can happen without being affected by the processor core reading/writing normal variables.