[TriEmbed] Logic Analyzer Recommendatio

Mon Jan 19 15:59:25 CST 2015

I've been using Saleae's original products for a few years now and have
been relatively happy with them. Though you can't buy them anymore,
hopefully the newer products are also good.

Their "Logic" was an 8 channel logic analyzer, and "Logic 16" was the
16-channel version. No analog support on either, just digital inputs. Their
software is cross platform (I've used it on Mac, Linux, and Windows); it's
pretty good, thought of course it has a few bugs.

I'm happy to bring & demo them to the next triembed meetup if anyone is
interested.

-svec

On Mon, Jan 19, 2015 at 4:47 PM, pete at soper.us <pete at soper.us> wrote:

> When they say the older bp has the same major features they leave out "and
> unlike with the new rev the features are all in the firmware as well as the
> marketing literature". Seriously, this is one of those rare cases where the
> implicit vs explicit contracts of open source sometimes fall short. If you
> want the new bp i'm sure Splatspace will make a deal. :-)
> ----- Reply message -----
> From: "Glen Smith" <mrglenasmith at gmail.com>
> To: "TriEmbed Discussion" <triembed at triembed.org>
> Subject: [TriEmbed] Logic Analyzer Recommendatio
> Date: Mon, Jan 19, 2015 3:53 PM
>
> I don't have any personal experience to add, but with all the talk I went
> looking for info on the Bus Pirate 3 & 4.
>
> From the Seed Studio web site:
> "Seeed Studio is the official manufacturer and supporter of the Bus Pirate
> project. Version 4 is the next generation Bus Pirate hardware, but it's not
> as stable as Bus Pirate v3
> <http://www.seeedstudio.com/depot/bus-pirate-v3-assembled-p-609.html?cPath=174>.
> If you're just starting out with the Bus Pirate we still recommend v3 -
> it's cheaper, more reliable, and has all the same major features. See a Bus
> Pirate v4 vs v3 comparison
> <http://dangerousprototypes.com/docs/Bus_Pirate_v4_vs_v3_comparison>.
> *Protocols* 1-Wire, I2C, SPI, JTAG, asynchronous serial (UART), MIDI, PC
> keyboard, HD44780 LCDs, and generic 2- and 3-wire libraries for custom
> protocols."
>
> It sounds like if you want to get some work done using the thing, V3 is
> the way to go, if you want another project, V4 apparently needs help
> getting firmed up.
>
> Glen
>
>
> On Mon, Jan 19, 2015 at 3:41 PM, Jon Wolfe <jonjwolfe at anibit.com> wrote:
>
>> I should have mentioned that about the bus pirate.  The 3.x version has
>> been the recommended version for a long time. It seems like as Pete said,
>> that the 4.x has been in beta forever. I have never used a 4.x but I've
>> almost bought one just for comparison several times.
>>
>> I also have the open logic sniffer,  and I still give an edge the the
>> sallae logic in the usability, especially in client tools. The ols is
>> technically faster and has more data lines, but at high speeds the on board
>> buffer fills in no time. There is a differential/rle mode I think, but it
>> was wonky for me when I tried. If your smaple rate is low enough,  the
>> sallea streams over usb so you essentially have an unlimited buffer.  I
>> don't think the ols can do that. The ols does have more sophisticated
>> triggers iirc though.
>>
>> Ther short answer Chip, is that you should just go out amd buy yourself
>> one of each ;)
>>
>> --Jon
>>
>>
>>
>>
>>
>> -------- Original message --------
>> From: Pete Soper
>> Date:01/19/2015 3:27 PM (GMT-05:00)
>> To: triembed at triembed.org
>> Subject: Re: [TriEmbed] Logic Analyzer Recommendatio
>>
>> Sorry to be late to the party.
>>
>> Two things with the bus pirate:
>>     1) Be super-careful to avoid the "latest" hardware version if the
>> software for that never got completed. I don't know if this situation was
>> ever corrected, but the last time I checked after (the worthless) Bus
>> Pirate for Splatspace wasn't cooperating the firmware author appeared to
>> have publicly backed away from completing the work (but that was at least
>> 18 months ago).
>>    2) The Bus Pirate is so slow and that even it's maker warns against
>> considering it equivalent to a logic analyzer for high speed data.
>>
>> I've been using the Dangerous Prototypes "Open Bench Logic Sniffer" for a
>> long time and it's gotten the job done. It isn't particularly fast (200msps
>> as I recall) but that's been fast enough for every situation I've been in,
>> and should certainly be adequate for SPI.
>> The problematic aspect with this hardware is that even the best client
>> software (OLS <http://www.lxtreme.nl/ols/>) is a bit brittle with
>> respect to the USB interface, occasionally requiring a restart.
>>
>> -Pete
>>
>> On 01/18/2015 11:54 AM, Chip McClelland wrote:
>>
>> To all,  thanks for the responses thus far. I have one other question
>> before I pull the trigger on this.  Does the Saleae doe enough extra to
>> justify the extra price over the Bus Pirate?   My main focus today is
>> listening to the I2C bus but am open to getting a more capable tool if it
>> may be helpful in the future.
>>
>>  Thanks,
>> Chip
>>
>> O
>>
>>
>>
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>>
>
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