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Please suggest a good cheap USB 16CH logic analyser

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Gyro:

--- Quote from: Electro Fan on June 06, 2019, 07:18:39 pm ---
--- Quote from: Gyro on June 06, 2019, 10:55:24 am ---There are cheap clones of the original Salaea logic 16 available on ebay eg. https://www.ebay.co.uk/itm/Mini-Saleae-16-Logic-Analyzer-USB-100M-Max-Sample-Rate-Support-1-2-10-Software-U/163266339370. There was no analogue support on the original one.

Generally they use a different FPGA from the original genuine one and do not rely on the Saleae downloaded bitmap. Most of them are supported by Sigrok Pulseview.

The sigrok supported devices page shows the internals and f/w details.


P.S. They don't have the switchable input threshold of the original - they're 3v3 with 5V tolerance.

--- End quote ---

This one looks pretty good
16 channels
+/- 50V (good for early RS323)

Is it confirmed that it works with Sigrok PulseView?

--- End quote ---

The one I bought does, but there are several variants as I indicated.

Mine is the "2015-01-08 variant" as shown in the attached link but housed in a black case like the ebay listing example. I'm not up to date with what PCBs are in the currently available ones - the Sigrok supported LAs page has more up-to-date information on support than I do. The version I have has series resistors and protection diodes (the 50V protection).

2015-01-08 variant... https://sigrok.org/wiki/Mcupro_Logic16_clone

General Sigrok LA support page... https://sigrok.org/wiki/Supported_hardware#Logic_analyzers


P.S. Incomplete quote fixed.

Ian.M:
Thanks everyone for the suggestions so far. 

My main usage is likely to be debugging code for 8 bit MCUs when attempting to bring them up, before I've got enough working I/O to support using a monitor ROM.

It looks like I'm going to need to budget roughly $100 for one of the FPGA based options to get a decent sample rate in 16CH mode.  OTOH if I am willing to settle for only 12MHz sample rate in 16CH mode, the Sigrok FX2LAFW firmware running on a Cypress FX2 EZ-USB eval board clone will do that with change from $10.  That may be acceptable if I'm happy with an 8 bit CPU system clock upper limit of a couple of MHz.  Of course there's no input protection, and its fixed 3.3V logic thresholds, albeit 5V tolerant.  If I'm going to go dirt cheap, it probably more sense to regard the FX2 board as disposable and concentrate on protecting the host USB port as adding on a daughterboard to provide protection, variable thresholds and a probe connector with one ground per channel, and a set of decent probes wont leave me with much change from that $100.  If I want analog, it looks like one can add one analog channel to a FX2 with just a fast parallel ADC, and a unit gain stable video OPAMP to buffer its input.   

With any of the non-pro grade logic analysers, complex triggering, and clocking from the D.U.T don't seem to be available options.   I was planning to use external hardware for complex triggering anyway, as by the time I've hooked up an 8 bit data bus + CPU control signals, there aren't very many channels left on a 16CH LA, and one does need to see A0 and A1 for many 8 bit peripheral chips to be able to see which register is being accessed.

I haven't had a chance to review all the LAs linked yet - that's a job for the weekend!

I would certainly welcome further suggestions, so please don't stop making them.

gslick:
As was mentioned back in Reply #6, depending on where you are located and how much bench space you have, picking up something like an HP 16500 series logic analyzer could be an option, but that would only be cheap if you could find one local to you. Otherwise the shipping alone can exceed the value.

Ian.M:
Thanks for the suggestion (and for helping me refine my requirements)  but it doesn't look like there are any cheap HP LAs anywhere near me, and I don't have the bench or storage space anyway.  PC connectivity for them also seems to be a whole multi-layer can of worms that could end up being rather expensive. 

Also the limited 'tether' range of the probe pods on a non-USB LA concerns me, as I'd basically need clear bench space directly in front of the instrument, rather than being able to set up a USB LA anywhere within a 2m range of the bench PC.  Topic title amended to include 'USB'.

rsjsouza:

--- Quote from: snoopy on June 06, 2019, 02:11:54 pm ---I bought one of these. Pretty good spec and memory depth ;)

https://www.aliexpress.com/item/Kingst-LA5016-USB-Logic-Analyzer-500M-max-sample-rate-16Channels-10B-samples-MCU-ARM-FPGA-debug/32774297984.html

--- End quote ---
I got a Kingst LA2016 and it is a very good unit with good software. Unfortunately Sigrok does not support it.

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