Raw Ethernet frames with XEmacPs driver

Question

Hi,

I posted a question a few weeks ago, and since I didn't get answer, I would like to try again in a simpler way.

I want to send and receive raw frames through the Eth0 interface (the Ethernet interface I've enabled) using a bare-metal aplication (XEmacPs driver).

I'm using the example code of this driver and Wireshark, but I can't see any identifiable frame from the Zedboard (MAC, frame length...).

What am I doing wrong?

Thank you.

Former Member · Accepted Answer

Hello Schlauby,

Actually, I solved the problem the last week, after I gave up for a long time. So, I can't send you an easy application for initializing because I haven't finished yet cleaning the "useless" code lines of the example, although I hope to do that this week.

However, if you are trying to see that XEmacPs example works in the same way I did it (Wireshark in PC), I can tell you which my problem was... although it's very stupid.

In the XEmacPs example, in EmacPsDmaIntrExample() function (which initialize the Ethernet device), there is a line that establish a loopback in the Ethernet device, so data can't go out the board through RJ45 port. So, if you simply comment the line where the funtion "EmacPsUtilEnterLoopback(EmacPsInstancePtr, EMACPS_LOOPBACK_SPEED_1G)" is used, you should be able to see (in Wireshark) one Ethernet packet from your Zynq board.

From this point, you can study and modify the sending and receiving in EmacPsDmaSingleFrameIntrExample() function (I am at this point trying to solve a problem with the device buffers when sending). If I made it, I'm sure anyone can. Anyway, I will post an easy example when I have it.

I hope this can help you. If you have other problems, tell me.