| Products > Test Equipment |
| Rigol MSO5074 Logic Analyzer issues |
| << < (5/7) > >> |
| tggzzz:
--- Quote from: Howardlong on September 24, 2024, 01:24:56 am ---While using a USB streaming LA is a viable alternative for this scenario, once you understand the scope it should do what you desire. Using a scope for this kind of work is a different workflow to using an LA: with a scope it's all about the triggers, whereas with a USB streaming LA it's a data grab and post processing. There are pros and cons to both, and it's not really a one-size-fits-all. I use both on a daily basis, but typically I go for the MSO first as I've been brought up with scopes and triggers. YMMV, I can see the friction of a learning curve around the scope might well be a turn off. --- End quote --- With a decent LA it is all about triggers and filters. The filters allow you to ignore irrelevant time-domain noise, and concentrate on digital domain signals. Simplest example: only capture data at a clock transition, since anything between clock transitions is irrelevant. Next example: ignore any of that data that isn't to/from a specified device. And continue adding filters so you can concentrate on the useful information. Protocol analysers do the same, but with messages not bits. |
| Howardlong:
--- Quote from: tggzzz on September 25, 2024, 09:25:02 am --- --- Quote from: Howardlong on September 24, 2024, 01:24:56 am ---While using a USB streaming LA is a viable alternative for this scenario ... a scope for this kind of work is a different workflow to using an LA: with a scope it's all about the triggers, whereas with a USB streaming LA it's a data grab and post processing. --- End quote --- With a decent LA it is all about triggers and filters. --- End quote --- TBF, I think it's clear that the context is regarding USB streaming LAs, not the "decent LA" you're referring to! Furthemore, the type of triggers you'll find on your average USB streaming LA typically amount to an edge or pattern... and that's it. |
| tggzzz:
--- Quote from: Howardlong on September 25, 2024, 11:06:06 am --- --- Quote from: tggzzz on September 25, 2024, 09:25:02 am --- --- Quote from: Howardlong on September 24, 2024, 01:24:56 am ---While using a USB streaming LA is a viable alternative for this scenario ... a scope for this kind of work is a different workflow to using an LA: with a scope it's all about the triggers, whereas with a USB streaming LA it's a data grab and post processing. --- End quote --- With a decent LA it is all about triggers and filters. --- End quote --- TBF, I think it's clear that the context is regarding USB streaming LAs, not the "decent LA" you're referring to! Furthemore, the type of triggers you'll find on your average USB streaming LA typically amount to an edge or pattern... and that's it. --- End quote --- The trouble is that too many people will use such "bit recorders", think they are representative of logic analysers, and not realise the ways in which a good analyser can make their lives more enjoyable. |
| Kean:
If this is a character LCD with an I2C interface via a I2C GPIO IC, then you will likely find that it is only using 4-bit mode. Typically the 8-bit GPIO provide 4 data bits and 3 control signals to the parallel bus input of the LCD. That would explain why you cannot find the letter "P" in the data stream. |
| Howardlong:
--- Quote from: Kean on September 25, 2024, 12:24:52 pm ---If this is a character LCD with an I2C interface via a I2C GPIO IC, then you will likely find that it is only using 4-bit mode. Typically the 8-bit GPIO provide 4 data bits and 3 control signals to the parallel bus input of the LCD. That would explain why you cannot find the letter "P" in the data stream. --- End quote --- I was wondering this too... now I look at typical designs, I think you're very likely right. They seem to use simple 8 bit I/O expanders, and that's it. |
| Navigation |
| Message Index |
| Next page |
| Previous page |