Xillinux xillydemo edit

How should I edit Xillydemo if I want to store values to user_r_mem_8_data to be read back in the terminal window? (Under /dev) I know that xillydemo uses demoarray to store to this user_r_mem_8_data register. Is the accepted practice to save what I want to demoarray? should I do it on the bus clock or another clock? Thanks a ton!

0 Former Member over 12 years ago

Hi,

I'm afraid I can't figure out what you want to accomplish, so I'll try some general comments.

It's perfectly OK to read from /dev/xillybus_mem_8 as a sequential file. Using hexdump -C -n 32 /dev/xillybus_mem_8 will print out the first (actually, all) 32 bytes in the array. This relies on that a newly opened file always starts on address 0.

So this is a simple way to print out the data to the terminal window.

As for clocking: demoarray[] is an inferred synchronous RAM. You may replace it with a dual-clock RAM (inferred or explicitly instantiated) if you want to access its content with another clock. The side interfacing with the Xillybus IP core must be clocked with bus_clk however.

I hope this helps.
Eli
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0 deaxman over 12 years ago in reply to Former Member

Thanks! Your reply was very helpful for the terminal side of the connection! I should have specified in my question though that right now I'm trying to create the bit file to write to the FPGA. This is being done as specified in the directions here: xillybus_getting_started_zynq and it was recommended that I modify the xillydemo.v file and write to the user_r_mem_8_data register in verilog (or vhdl). So I'm just not sure how to send the values into the register to be brought to the /dev folder. Thanks!
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0 Former Member over 12 years ago

Please refer to section 4.4 in the Getting started with Xillybus on a Linux host guide, with emphasis on the memwrite demo program. The sources should be on Xillinux' file system at /usr/src/xillinux, or you may download them as part of the Linux bundle at

http://xillybus.com/downloads/xillybus.tar.gz

The memwrite program shows how to write to a specific address in the register space.

Regards,
Eli
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0 deaxman over 12 years ago

Thanks, I got it working based off of what you said, the problem I was having for most of the time was a problem with mem_8_data not wanting to accept writing and not knowing how to write to it. Thanks again!
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0 deaxman over 12 years ago

Why does hexdump only return two unique digits repeating for all 32 slots?
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0 Former Member over 12 years ago

I just answered your question here:

http://www.zedboard.org/content/terminal-read-zedboard
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0 deaxman over 12 years ago

Sorry I posted it twice, I figured it was more pertinent to this thread but I also wanted it to be very viewable. Thanks!
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