SPI capture guide

Sorry if I'm thick tonight, but does this mean you've got good MJx capture files now? If so, yay! The last set of photos don't seem to show up.

If not, can you post one (logicdata file) so we can see why you're getting?

Deal57 wrote: Sorry if I'm thick tonight, but does this mean you've got good MJx capture files now? If so, yay! The last set of photos don't seem to show up.

If not, can you post one (logicdata file) so we can see why you're getting?

Sorry for confusion, I'm not having good result yet, I will try to capture MJX with new setting later today.

Deal57 wrote: Sorry if I'm thick tonight, but does this mean you've got good MJx capture files now? If so, yay! The last set of photos don't seem to show up.

If not, can you post one (logicdata file) so we can see why you're getting?

I'm not lucky,still get error message, captured file :
www.mediafire.com/download/ave3aeasd5u38r5/MJX600-SPI-error.zip

dc59 wrote:

Deal57 wrote: Sorry if I'm thick tonight, but does this mean you've got good MJx capture files now? If so, yay! The last set of photos don't seem to show up.

If not, can you post one (logicdata file) so we can see why you're getting?

I'm not lucky,still get error message, captured file :
www.mediafire.com/download/ave3aeasd5u38r5/MJX600-SPI-error.zip

Ok, you're right, it's really weird! I think the clock is behaving oddly. The clock seems to work upside down (low inactive) for the first couple of bytes, then it works right (high inactive)! I need to mess with the capture some more as it is possible that you've got some usable data -- I flipped the clock and then you get a couple of good bytes, then the rest are errors. I haven't seen that sort of behavior before, but I'm kinda a newbie with this, too. Has anyone else seen anything like this?

Can you double check your ground connection?

Hi Deal57,
I checked ground connection with ohm guage, I'm pretty sure it's correct!

TOTAL SPECULATION: In looking at the SPI definition it looks like the inactive state of the clock can be used by the Master to allow the slave to communicate back. I'm guessing maybe that's what we are seeing. In looking at the rest of the stream, the data pattern appears consistent and packets are flowing from the master to the slave. It looks to me like the data on MOSI is following the general approach used in other protocols for the XN297.

I'm thinking you can safely use these settings and just ignore the errors in those first couple of bytes. The trigger point looks like it is set at about the right place. Can you try running a bind sequence capture? Maybe we should be discussing this further in the MJX protocol thread?

I used an excel template to break the packets out individually; here's the first few packets from this capture. I can't do the actual programming but maybe I can 1) learn a bit more and 2) help save the programmers some time.

I uploaded some data,please check MJX protocol thread,thanks!

Hey guys,

I want to start looking at the protocols and getting involved. Is the Saleae logic 8 a good choce? Thanks and sorry for the thread hijack.

The salea logic 8 is a great choice. More than adequate to do the captures, good quality, comes with great software. It's the PB-approved solution.

i need only this for track the signal?

www.banggood.com/USB-24M-8CH-24MHz-8Chan...YL2512105842201212FR

it's out of stock...

Yes, that will work, but the clones aren't PB-approved. They don't come with software, so you either steal the Salea software which he doesn't think is a good idea, or you use open source software which doesn't work nearly as well.

But you can find them all over ebay as well as from banggood. I'd recommend that, as when I ordered one from banggood they shipped me a motorcycle handbrake. That didn't work very well for capturing data!

It's well know that you have to flip a USB connector twice in order to get it to plug in.

Seems to actually be fixed with USB C, though. Plugs in in either orientation, and I seldom have to flip it more than once.

goebish wrote: my favorite part of the video:
youtube
20 seconds ... damn usb connectors

Seby is 100% agree with you.

This is excellent. Is there a thread like this that goes over the analysis and implementation?

goebish wrote: my favorite part of the video:
youtube
20 seconds ... damn usb connectors

Haha Jalous

Hello everyone, would like to make a conscious effort to attempt to contribute spi data and to help assist and add to this awesome devation protocol list.I took the frst step in ordering an analyzer from a vendor on ebay do to banggoods lack.It will probably be a few week before it arrives because of the current festivities of the new year overseas.I've been reading and watcihng tutorials of tihs and trying to prep myself so I can fully indulge once the equipment arrives.What I need to know is where I can go to download the software,or is it bundled with the analyzer.Banggood posted a link but It took me str8 to a web alley with no door.If anybody can be kind enough to chime in with this info it will be greatly appreciated.

C0ckpitvue 777 wrote: Hello everyone, would like to make a conscious effort to attempt to contribute spi data and to help assist and add to this awesome devation protocol list.I took the frst step in ordering an analyzer from a vendor on ebay do to banggoods lack.It will probably be a few week before it arrives because of the current festivities of the new year overseas.I've been reading and watcihng tutorials of tihs and trying to prep myself so I can fully indulge once the equipment arrives.What I need to know is where I can go to download the software,or is it bundled with the analyzer.Banggood posted a link but It took me str8 to a web alley with no door.If anybody can be kind enough to chime in with this info it will be greatly appreciated.

www.saleae.com/downloads