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TM4C129ENCPDT: TM4C129 EMAC does not send anything sometimes

Amir-Yungman
Intellectual 410 points
Part Number: TM4C129ENCPDT


Looking for a lead to search bug.

What might be the reasons where EMAC *sometimes* does not send anything out (wireshark)

Heavy O/S environment, lot's of TCP open/send/close
After that "transparent to EMAC" send everything continue normally
There is NO error indication in ISR

  • 0
    TI__Guru**** 191906 points
    Hi Amir,
    I'm going to assign your post to one of my colleagues who can help you.
  • 0
    Expert 1690 points
    Hello Amir. What is the version of the LwIP lib that you use? is it the 1.4.1 included with TivaWare? If so, download and replace with 2.0.2
    John
  • 0 in reply to John Piliounis
    TI__Guru**** 191906 points

    Hi John,

      Thanks for helping out. Amir mentioned in another post that his upper layer stacks is not LwIP based. 

  • 0
    Expert 1690 points
    
    O.K. Charles. Thankzzzz. Hadn't notice that.
    All the best,
    John
     
    -----
  • 0 in reply to John Piliounis
    Intellectual 410 points
    so guys, after noticing that, can you hint for direction on:
    1. What may cause the EMAC not to send pkt at all?
    2. When that happends how do I know it in my firmware?
    3. Will the EMAC indicate it in the EMACIntStatus() - which macro?
    4. Will it unset the DES0_TX_CTRL_OWN in case of an error?
    5. If I set EMACIntEnable(EMAC_INT_RECEIVE | EMAC_INT_TRANSMIT) will I still get interrupt when error occurs?
    6. I HAVE READ THE "Peripheral Driver Library" - but it is not clear at all, Can you explain what is:
    EMAC_INT_TX_STOPPED, EMAC_INT_TRANSMIT, EMAC_INT_TX_NO_BUFFER and so on...
    7. Where can we find more information beside that slim user-guide?

    BTW, I am using TivaWare_C_Series 2.0.1.11577, I know it's old, but that's not the reason....
  • 0 in reply to Amir-Yungman
    TI__Mastermind 22640 points
    Hello Amir,

    Do you still need help with this post?

    The TivaWare version you are using is really old. Please use a later version of Tivaware as there are lot of bugs that have been fixed and might fix your issue. One such bug is highlighted in the following thread, which might help: e2e.ti.com/.../1316428

    Thanks,
    Sai
  • 0 in reply to Sai Reddy
    Intellectual 410 points
    We cannot upgrade in that stage.
    However, my questions were "theoretical" and does not concern to TivaWare specific firmware version.
    If I understand how the EMAC behave, I will know how to solve the problems I described.
    I'm almost sure that there is no connection to TivaWare version. If there is error ISR bit's then it might happens, and the driver should deal with them. Currently in ALL examples I looked into, including new, it does not.