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Logic Sniffer Stuff
Contents of this website are freeware and/or copyrighted material, and may not be sold
under any circumstances.
Email: dogsbody@mygizmos.org
Home:
http://www.mygizmos.org
1. Logic Sniffer Background
The Open Logic Sniffer is a tiny logic analyzer that is very small,
very portable, very useful, and for those inclined easy to
customize. The design is compatible with the SUMP Logic Analyzer,
and was created by the labs of Dangerous
Prototypes and the Gadget
Factory. The OLS plugs into a USB port on your
computer, and
a program such as Jawi's OLS Client
controls it.
The OLS uses a Xilinx FPGA for the heavy lifting. The source code
for it is open source. Thus if you're familiar with Verilog
or the VHDL language, you can change it. Same goes for the
client programs.
They've arranged for Seeed Studio
to build it. Get
one here. |
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2.
Wire Harnesses
A logic analyzer is only
useful if you can connect it to something. For that you'll
need wiring harnesses. Seeed Studio sells them for
$6.
They're made from ribbon cable, with permanently attached clips.
I prefer the wiring harnesses from Sparkfun Electronics here
however. Saleae Logic also sells them plus separate test
clips here.
The clips are a somewhat pricey upgrade though. Sparkfun
also sells jumper wires
that should work fine.
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3.
Acrylic Cases
The OLS comes as an
assembled bare circuit board. Not so great for longevity.
If you want a case, you'll need to buy one
or make one. I chose the latter.
I used the Ponoko
laser cutting
service, with an Inkscape SVG
design file.
It's derived from J.J.
Shortcut's design. I used 3mm thick clear acrylic
plastic. For a tight fit, you should install headers in the
UART, ICGP, & ROM-ISP locations. For the buttons, a dab of
glue stick holds the
square plastic cutouts in place. |
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Assembled Case
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5.
FPGA with HP16500/16550 style triggers -
Download Latest Release
A new FPGA image with advanced triggers modeled on features of HP
16500/16550. Click picture for details.
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