[TriEmbed] Logic Analyzer Recommendatio

[Jon Wolfe]

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





<div>-------- Original message --------</div><div>From: Pete Soper <pete at soper.us> </div><div>Date:01/19/2015  3:27 PM  (GMT-05:00) </div><div>To: triembed at triembed.org </div><div>Subject: Re: [TriEmbed] Logic Analyzer Recommendatio </div><div>
</div>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) 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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