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c6678 Ethernet UDP packet size

Alex Jivin
Prodigy 170 points

I am currently working with the TMDSEVM66788L (The processor is multicore DSP TMS320C6678L) . I have ccs v6 on my pc with  mcsdk_2_01_02_05 and ndk 2_24_03_35.

I am using a project based on the hello world (The path of the example I use is:  C:\ti\mcsdk_2_01_02_05\examples\ndk\helloWorld\evmc6678l).

I am trying to send using UDP protocol packets from my PC to the EVM and vise versa. I am currently able to send and receive 2500 byte size packets but not larger.

I know that the UDP protocol enables 64K size packets. I do not know why I am not able to send or receive larger packets then 2500 bytes. Currently I want to send and receive 8000 byte size packets.

If someone had the same problem and knows the solution that would be great. 

  • 0
    TI__Guru* 81335 points

    Hi Alex,

    In order to send larger packets, you need to enable Jumbo packet support. Please follow the steps provided in the below wiki to achieve that,

    Thank you.

  • 0
    TI__Guru** 116100 points
    How you are handling the UDP packet in PC (windows or Linux) ?

    Try to increase the buffer at PC side.
    int size = 64 * 1024;
    setsockopt(size, SOL_SOCKET, SO_RCVBUF, &size ,sizeof size);
  • 0 in reply to Raja
    Prodigy 170 points
    Hello Raja,

    I have tried to enable the jumbo packets using the link you kindly provided, but unfortunately i was not able to enable it. I discovered that in order to make NIMU modifications I need the "bios_mcsdk_2126_jumbomodtest" folder, unfortunately I do not have this folder on my PC. I tried to download the bios_mcsdk from this link (I downloaded bios_mcsdk_02_01_02_06_setupwin32.exe & bios_mcsdk_02_01_02_06_patch01_setupwin32.exe):

    software-dl.ti.com/.../index_FDS.html

    But it seems that after those downloads I still do not have this folder, thus I am unable to continue the enabling jumbo packets process.

    I have the next folders installed in my ti folder:

    1. mcsdk_2_01_02_06 (which was in stalled from the link above)
    2. ndk_2_21_02_43
    3. pdk_C6678_1_1_2_5
    4. bios_6_45_01_29
    5. xdais_7_24_00_04
    6. xdctools_3_23_04_60
    7. ti-cgt-c6000_8.1.0 compiler

    Am I missing anything? where can I download this folder?
  • 0 in reply to Titusrathinaraj Stalin
    Prodigy 170 points
    Hello Titus,

    I am handling the UDP packet in windows.

    I have tried to make your adjustments but with no success. I am still unable to send larger packets then 2500 bytes.

    Are there any other code adjustments I can make to enable me to transfer larger packets ?

    Are there any parameters that can help me?