microsquirt v3 serial connection drops every 12seconds

electronic · Post by **electronic** » Sun Jul 06, 2014 1:16 pm

The older version of TS that I had been running for the past few months was great, but I decided to upgrade firmware on microsquirt from 3.3.1 to 3.3.2 and low and behold the older version of TS wouldn't work, so I updated to the latest version of TS and it freezes up ever so slightly and goes off line once in a while, what's the deal with that? Nothing was changed except firmware was updated and newer version of TS uploaded.

electronic · Post by **electronic** » Mon Jul 07, 2014 12:20 am

Tried logging and it's freezing up as well, when I replay the data, it stops every few seconds.

LT401Vette · Post by **LT401Vette** » Mon Jul 07, 2014 7:00 am

The newer firmware uses the new protocol. Some Prolific based cables do not work well with MS2 on the new protocol due to a bug in the Prolific chipset. It wasn't noticable with the old protocol, but does potentially risk causing corruption as the old protocol doesn't have CRC checking and error prevention.
If you switch to the JSSC driver there is a work around in place to work with these cables, but it is still advised to get an FTDI based cable or Prolific based on the HX Rev D chipset. The bug seems to be corrected in the HX Rev D chipset.

Post by **jsmcortina** » Mon Jul 07, 2014 7:05 am

The OP mentioned upgrading from 3.3.1 though - that already uses the newserial protocol?

James

LT401Vette · Post by **LT401Vette** » Mon Jul 07, 2014 7:16 am

The Prolific bug is tripped by specific block sizes. So it can appear with just a change in the outpc read size.
The work around in the JSSC driver deals with this.

electronic · Post by **electronic** » Mon Jul 07, 2014 4:00 pm

So is there a difference between 3.3.1 and 3.3.2 firmware?

Post by **jsmcortina** » Mon Jul 07, 2014 4:08 pm

electronic wrote:So is there a difference between 3.3.1 and 3.3.2 firmware?

There was one small serial communications change, but it shouldn't cause any issue.
Other changes yes, plenty, see the ChangeLog.

Perhaps it would be worth reverting to the previous firmware and existing tune as a test. Keep the same new TunerStudio. That way you can isolate whether it is a firmware or TunerStudio change that is causing the changed behaviour.

James

electronic · Post by **electronic** » Mon Jul 07, 2014 6:13 pm

I will try that and see what happens, I do like ability to switch to a different ignition and fuel map with a flex fuel output, but datalogging and getting a good connection is a lot more important to me at this moment.

electronic · Post by **electronic** » Wed Jul 09, 2014 12:16 am

Went back to 3.3.1 firmware and it's still doing the same thing............everything is fine for 12 seconds then everything freezes up and it goes off line for a second, then comes back and does the same thing every 12 seconds. Didn't have problems uploading the firmware, and that takes longer than 12 seconds.

LT401Vette · Post by **LT401Vette** » Wed Jul 09, 2014 5:58 am

Have you tried the JSSC driver yet?
I don't know this is your problem for sure yet, but sounds very much like it. So that seems like the easy thing to try before making you try different firmwares, TS versions, capturing Comm Debug logs ect. I'm trying to take the simple path to the solution for you.

electronic · Post by **electronic** » Wed Jul 09, 2014 12:20 pm

I haven't tried anything else yet, but it seems that the problem lies in the serial communication area. I don't think it's firmware related, I think it's hardware related.

electronic · Post by **electronic** » Mon Aug 04, 2014 1:13 am

not sure what's going on, but everytime I connect ecu to the computer via cable it connects for 12 seconds and then disconnects for 2-3 seconds and then goes back online and does the same thing over and over again. Can't datalog anymore because of it. But i didn't have a problem uploading 3.3.2 firmware and then uploading back to 3.3.1 firmware, because I thought that's why it was doing it. Any help?

Thanks.

grom_e30 · Post by **grom_e30** » Mon Aug 04, 2014 1:18 am

how are you connecting it to the computer with a real serial port of with a usb to serial adapter?

24c · Post by **24c** » Mon Aug 04, 2014 1:20 am

Hi,
Is the computer/laptop hooked up to the mains or on battery (grounding)?
Have you got a long USB cable going near the engine (interference)?
Have you got 12V maintained during this time? Bad connection? Nothing getting warm?
There was an issue with Prolific USB Serial drivers, and I think it was TunerStudio update doing the right things and a bug in the Prolific driver, but that was sometime ago.

Mike

electronic · Post by **electronic** » Mon Aug 04, 2014 1:33 am

connecting ecu to the computer with a usb/serial adapter that I have been using for the past year, never had a problem till now. Don't have problems uploading new firmware with the same usb to serial adapter, but when I try to modify a tune I have to be quick about it, or it won't make any changes since it disconnects itself. BTW ecu works fine, no problems.

grom_e30 · Post by **grom_e30** » Mon Aug 04, 2014 1:39 am

i had the same problem using one of the prolific based cables worked for a yeah happily then started using it again and was next to useless wondering if your cable uses the same chip, you should be able to find out what chip its using by looking at the drivers. Ftdi chip devices are the ones to go for same brand of chip that's used on the ms3 card for usb.

electronic · Post by **electronic** » Mon Aug 04, 2014 1:58 am

Cable is fine, I just tried another one that I had laying around, and it does exact same thing.

electronic · Post by **electronic** » Mon Aug 04, 2014 2:33 am

I can start the engine and connect it the computer and it does the same thing, the engine runs normal, but the tuner studio keeps going off line every 12 seconds or so for few seconds and then comes back and goes off line in 12 seconds again, and so on and so forth.

electronic · Post by **electronic** » Mon Aug 04, 2014 2:39 am

What's a JSSC driver?

grom_e30 · Post by **grom_e30** » Mon Aug 04, 2014 2:45 am

are they both prolific chip based cables?

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