Page History

...

Starting Vivado, click click click.. Exporting to SDK, click...

Starting lwIP LwIP based Echo Server. No Echo. No nothing.

...

I mod one of Xilinx examples (the ping requester) to send one packet in eternal loop. Starting the app - as soon as I do, windows starts sending megabytes per second. I press halt in debugger. Windows stop sending packets. All the time the properties pages page shows 0 packets received.

Image Added

We need Hard Debug. I mark MII pins from the RMII to MII wrapper for debugging. In Vivado analyzer I see MAC addresses in the MII RX Data bus, hence the packets do get into FPGA and do get converter from RMII to MII also.

So where is the problem?

More reading, this time Ethernet Lite user guide. If packets are MII, and if they are at all valid (even if FCS is missing etc) then at least some bytes should be visible in the RX ping-pong buffers, right?

I switch to the XMD console in the SDK:

mrd 0x40E017FC

reads as 1, valid packet in buffer?

Lets take out network cable, and reset this bit, now it stays 0. Cable back, reading again. And again the buffer valid bit goes 1.

So why id LwIP never see any incoming packets?

I do some single stepping, and finally add one break-point at "detect ARP". Run.. and break hit.

ARP packets come and are decoded as well? So this thing must actually work? I check my own PC's IP address and adjust the local IP for the echo responder code.

ping!

< 1 ms

It does work.