Saleae Logic - Page 1
Forum section: electronics / general

author: Unknown
author_rank: Unknown
timestamp: February 23, 2011, 02:10:46 am
content: How about a review of the SaleaeLogic analyser/serial bus decoder? It certainly is a very interesting product.http://www.saleae.com/home/

author: frank26080115
author_rank: Regular Contributor
timestamp: February 25, 2011, 04:34:46 am
content: I like it, I have two now, one of them is a clone that only costs $50 instead of $150http://iteadstudio.com/store/index.php?main_page=product_info&cPath=29_31&products_id=221The software makes it more preferable over Open Logic Sniffer, which I also have but never use (because of the software).Some people have complained about the computer not being able to keep up with the Saleae's maximum sample rate, but my computer is decent and it's never bothered me.

author: Unknown
author_rank: Unknown
timestamp: February 25, 2011, 01:33:28 pm
content: Surely the maximum data transfer rate is equal or less to USB 2.0 specs. I dont see how a modern computer cannot keep up with that.I am also puzzled by the architecture. Is the device sampling at the frequency and duration specified in the software and streaming to the PC? Is there any buffering taking place? Can you create triggers on specific data packets?Would I be asking for too much if I asked for a couple of pictures of the internal circuit, please?EDIT: Cancel that:http://hackaday.com/2009/03/06/tools-saleae-logic-logic-analyzer/#more-8836

author: Unknown
author_rank: Unknown
timestamp: February 25, 2011, 01:51:51 pm
content: Quote from: Alex on February 25, 2011, 01:33:28 pmIt needs a sustained transfer rate, USB was not designed for this, especially in bulk transfer mode (it's designed for things like mass storage devices, which can wait). Some computer chipsets are better at this than others.Quote from: Alex on February 25, 2011, 01:33:28 pmThe hardware just transfers bytes (8-bit = 8-channel wide) at the specified rate to the PC. The PC does all work like triggering and decoding.Quote from: Alex on February 25, 2011, 01:33:28 pmVery little, which is why USB transfer rate can be an issue. I personally didn't have any problems achieving the full 24MS/s on two computers.Quote from: Alex on February 25, 2011, 01:33:28 pmI believe advanced triggering is still work in progress. The current software supports basically a one-stage edge/pattern trigger. You can download the software and run it in demo mode without the hardware to try it.Quote from: Alex on February 25, 2011, 01:33:28 pmThe Sigrok website has some. Not much to see, just an MCU with USB interface in DMA mode. Most of the complexity is in the software, so clones (which supply their own hardware but use the original software) are a significant issue.

author: epokh
author_rank: Newbie
timestamp: March 17, 2011, 12:22:31 pm
content: Hello guys,this an interesting topic.I'm actually working on essentially a similar device called Bug Logic 2.It has the same specs of the Saleae logic but I'm working to develop an open source firmware forthe Cypress chip.http://buglogic.robomotic.com/tiki-index.phpI'm selling it at 25.00 pounds and the profit is pushed for the software development.The main issue with current usb based chip yes is the transfer rate,I'd love to see a PCI or AGP based pod in the future.P.S.You can find plenty of clones in the chinese market.:-)

author: Fraser
author_rank: Super Contributor
timestamp: March 17, 2011, 07:02:55 pm
content: epokh,Your post interested me so I took a look at your site. Very interesting.I went to order one at £25 but after "extras" it's actually £36.Is this your unit for sale with free shipping and a cost of only $39.90 delivered? :http://www.aliexpress.com/product-gs/424564397-Saleae-Usbee-Clone-Logic-Analyzer-Aluminum-Case-Free-Shipping-WB078-wholesalers.htmlI would buy direct from you if you offer it delivered to the UK at $40.00 as advertised above.

author: epokh
author_rank: Newbie
timestamp: March 17, 2011, 07:16:23 pm
content: Yes I believe is probably the same but certainly not the same supplier.Yes I'm still fiddling with the shop options cannot get the shipping right.For uk delivery is 25+4 pounds royal mail, I can send you a paypal request directly.I test the boards individually you can try to buy from him if you believe is a better deal.As I said i'm not doing it as a business :-)

author: Fraser
author_rank: Super Contributor
timestamp: March 17, 2011, 07:22:16 pm
content: epokhUnderstood£25 + £4 postage is very fair.I will PM you.