WARP Project Forums - Wireless Open-Access Research Platform

Than for your replies.
I have a question concerning the OFDM Reference Design - CSMA Link. I wanted to try this application but i have problems to make it work.
I downloaded the file "download-csmamac.bit" from the last reference Design on the SD card (following the steps in the website). I set the DIP SW SW2 correctly (i think because the LEDs D6 D7 are showing respectively on the 2 boards 00 and 01). But i could not ping the PC connected to the WARP ( I tried a connection with a switch between the 2 PC to confirm that the problem is within my configuration on the WARP and )

Thank you for help

-i am using antennas and they are very close
- For the cables i have non crossover ones. And i worked with the same cables with WARPLAB. But how do I know that is working properly? The 3 LEDs next to each Gb interface what do they represent?
- I did not tried yet noMAC  but i will now.
- For the Tx LED (green LED near "RF A"), it is not working (D1 is red and D2 is tuned off) and none of the user LEDs (D8-D11) is blinking.
What i have done, is i downloaded the .bit file in the memory card, i set propoerly the dIP SW for the corresponding SLOT. I set properly the DIP SW for the node ID like in here http://warpproject.org/trac/wiki/WARPLa … ngStarted.
I connected my 2 laptops to each ETH A. when i turned on the WARP, D6 was was blinking strangely displaying 1 and 0. so i tried ETH B. Then i get from the 7seg 00 and 01 respectively . But for both interfaces, user LEDs are not blinking. So i don't know what i did wrong exactly.

Hi everybody,

I am trying to to generate .bit file for the cogMAC project (server and client) but i am facing few problems.
So i was following the tutorial from here http://warpproject.org/trac/wiki/OFDMRe … t_Creation .
But when i arrive to the step "The project will now build to completion, printing elfcheck passed" i got this error "src/MAC/COGMAC/cogmac_server.c:18:30: fatal error: ascii_characters.h: No such file or directory compilation terminated." But i already included the path for the WARPMAC and I see all the files on the WAPMAC directory
And  by comparing my project to CSMAMAC and NOMAC I can see that  under Includes "C:\w3_OFDM_ReferenceDesign_v18p1\SDK_Workspace\w3_OFDM_ReferenceDesign_v18p1_bsp\microblaze_0\include" does not exist.
Also for  the step  "Assign Code Sections to iocm, Data sections to docm, Heap/Stack to xps_bram_if_cntlr_1", I don't have "docm"  i have only "xps_bram_if_cntlr_0" "xps_bram_if_cntlr_1" "xps_bram_if_cntlr_2" as choice.

Thank you for help

Thank you for your answer.
Yes I am able to build nomac and csmamac successfully.
I will try this and I'll let you know.
Thank you again

But for the next step which is "Assign Code Sections to iocm, Data sections to docm, Heap/Stack to xps_bram_if_cntlr_1", I don't have "docm" and "iocm".  i have only "xps_bram_if_cntlr_0" "xps_bram_if_cntlr_1" "xps_bram_if_cntlr_2" and DDR_"GB as choice. So what are the associations that i have to do?

You can assign code and data to xps_bram_if_cntlr_0 and xps_bram_if_cntlr_1. xps_bram_if_cntlr_2 must not have any assignments (it's the PHY packet buffer).

and for the step "Debugger Options: Set the ISOCM field to: 0x00000000 isocmsize 65536 isocmdcrstartadr 0x100" (I am using xilinx design tools 14.1 and warp v3)

That step is a workaround for an SDK/XMD bug for the PPC405 in Virtex-4 chips. You can skip that step for WARP v3.

XIo_Out32 has been renamed Xil_Out32, and XIo_In32 is now Xil_In32. You'll have to change all references to these macros in the cogmac code.

w3_OFDM_ReferenceDesign_v18p1/SDK_Workspace/src/MAC/COGMAC_client/cogmac_client_hw.c:419:

What's on line 419? It's probably a macro that wraps a call to XIo_Out32.

Sorry, I was wrong above- XIo_Out32/In32 are still defined (so are the Xil_ versions, I think; just in a different header).

What includes does your top-level MAC have? Does it match the reference MACs for the current ref design?

#include "util/ascii_characters.h"
#include "util/ofdm_txrx_mimo_regMacros.h"
#include "util/ofdm_agc_mimo_regMacros.h"

xio.h is included via ofdm_txrx_mimo_regMacros.h. Your code must include xio.h via some route (directly or via another include).

Hi everybody,

I have a little question.
So I have tested the NoMAC and and CSMAC. So everything is working when I use Iperf, with wireshark I can see that all the packets are received by the destination. The problem is when I try streaming for example using MPEG TS with VLC. On the destination i can't find any stream to read with VLC. I have noticed, with wireshark, that on the source the protocol of the packets is MPEG TS but for the destination it is only UDP. And it is not a problem of firewall because i tried the same config by connecting the 2 laptops directly and i streamed a video. So I don't know exactly what is the problem.

Thank you for help

So I have tested the NoMAC and and CSMAC. So everything is working when I use Iperf, with wireshark I can see that all the packets are received by the destination. The problem is when I try streaming for example using MPEG TS with VLC. On the destination i can't find any stream to read with VLC. I have noticed, with wireshark, that on the source the protocol of the packets is MPEG TS but for the destination it is only UDP. And it is not a problem of firewall because i tried the same config by connecting the 2 laptops directly and i streamed a video. So I don't know exactly what is the problem.

I'm not sure what this problem is. If Wireshark is showing received packets, then it seems the OFDM ref design is working. Maybe try other encodings from the VLC source (i.e. raw instead of MPEG TS)?

I am trying to use cogmac_server and cogmac_client.  I generated the 2 bitstreams and downloaded them to the boards.
I set cogmac server DIP LED as 000 initially...and IP as 10.0.0.20 and for cogmac client as 001 and IP as 10.0.0.1. I can see that on the server node LED 06 is changing (I presume that is the channel hopping).
However, Nothing is changing on the client node and i can't ping the pc attached to the client.

You'll have to dig into the code and figure out whether the client is receiving any packets. I would suggest adding prints to the goodHeader callback to see if the node is receiving anything.

Also worth trying would be to modify the server and client code to disable frequency hopping to ensure they're actually working normally if tuned to the same channel.

So to figure out whether the client is receiving any packets and see the messages, i have to connect to the using the UART on a PC and a terminal like putty?

That's a useful debugging setup, yes. Pings not working is a very high level observation- we need to isolate variables to understand why the link doesn't appear to work. Disabling channel hopping is a good first step. Observing whether the Rx node receives any packets is another.

Hi again,

I want to implement RTS/CTS mechanism but i don't know how to do that and  from where to start.
Can anybody help me with this.

thank you