paulf
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| posted on 22/3/05 at 10:24 AM |
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Megajolt progamming help required.
I have built myself a megajolt unit but am having problems loading the configaration to it.
The problem I have is that when trying to update the configaration the PC cannot communicate with the controller. I have used a blank 68hc908kx8
microcontroller and loaded the boot loader file to it with a homebuilt programmer.I then put the chip in the megajolt and connect to the pc, the pc
can communicate and read the default config and runtime from the megajolt.As soon as i try to change the configaration file and upload to the megajolt
it stops communicating .The only way I can re establish communication is by reflashing the chip in the programmer.
I think it could be due to the security settings on the processor but not certain , i cant see any other reason for it to behave in this manner other
than the configartion file being corrupted somehow.
I have asked this question on the megajolt forum but have still had no reply, I am now completely stuck and cant make progress until i resolve the
fault so any sugestions would be appreciated.
Paul.
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PaulBuz
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| posted on 22/3/05 at 04:50 PM |
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Megajolt
http://picasso.org/mjlj/?q=forum
[Edited on 22/3/05 by PaulBuz]
ATB
Paul
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paulf
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| posted on 22/3/05 at 08:07 PM |
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Ive been there and posted for help twice but no replys yet, I have also searched all the archives, so am really stuck .
Paul.
quote:
Originally posted by PaulBuz
http://picasso.org/mjlj/?q=forum
[Edited on 22/3/05 by PaulBuz]
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chriscook
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| posted on 22/3/05 at 11:28 PM |
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you tried uploading new firmware once the chip is installed in the MJLJ? Just guessing really - built mine witha chip from Brent and it communicates
fine.
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sgraber
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| posted on 26/3/05 at 02:32 AM |
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You are talking about the MJLJ right? Brent Picasso will be at my house tomorrow. he is vacationing close to my place. If I can remember, I will ask
him to sit at the PC and give you some advice.
Graber
Steve Graber
http://www.grabercars.com/
"Quickness through lightness"
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paulf
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| posted on 26/3/05 at 09:33 PM |
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Steve.
That would be ideal, and much appreciated.I have a feeling that I have not programmed the microcontroller correctly, I have burned the S.19 file to
it but am now beginning to wonder if the boot loader to allow reflashing in the megajolt is included in the file. I have tried adding it to the
prcessor in the programmer but cant get a successful copy to the chip.
The annoying thing is I ordered 4 PCBs from Brent but didnt bother to buy the preprogrammed chip as i had a few blanks and was convinced I could flash
them myself.
Im now stuck and want the car back on the road for the 1st of April after the winter upgrades, and want to start planning the megasquirt installation
next.
Paul.
quote:
Originally posted by sgraber
You are talking about the MJLJ right? Brent Picasso will be at my house tomorrow. he is vacationing close to my place. If I can remember, I will ask
him to sit at the PC and give you some advice.
Graber
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paulf
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| posted on 26/3/05 at 11:32 PM |
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At last, I have managed to get it to work.
I was correct in guessing that the boot loader was not included in the S.19 file.
I have finally worked out how to use the Dos hc08 programmer and loaded the boot and s.19 files and it now works.
All I have to do is escape to the garage tommrow and install on the car.
Paul
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sgraber
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| posted on 27/3/05 at 12:29 AM |
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That's great news Paul.
Brent was over today and I told him to get over to this website to take a look at your problem. But since he is on vacation he has only intermittent
Internet access this week. I am glad you figured it out. 
Steve
Steve Graber
http://www.grabercars.com/
"Quickness through lightness"
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brentpicasso
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| posted on 27/3/05 at 03:34 AM |
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Hi Paul,
I regret that you had to thrash about so much trouble shooting the problem. But I'm happy you figured it out!
yes, the way I program the chips is that I burn the bootloader first, then use the bootloader to load in the MJLJ firmware. A side benefit from the
process is that it proves the chip can be field upgradable.
You should try the beta firmware- I'm close to making it the next released version!
Related to troubleshooting, I've added a troubleshooting guide to the MJLJ website, here: http://picasso.org/mjlj/?q=book/view/354
Oh! and by the way Steve's project is quite a sight to behold first hand... It is truly inspired!
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sgraber
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| posted on 27/3/05 at 04:14 AM |
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Ok - group hug...  
Thanks Brent, It was fun visiting with you at casa de Graber today.
Steve Graber
http://www.grabercars.com/
"Quickness through lightness"
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paulf
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| posted on 27/3/05 at 04:36 PM |
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Thanks steve and Brent for the info, I think I will try the Beta firmware now I know how to flash it.
Im looking forward to trying the car on the road with the new ignition and working on the fuel injection.
Paul
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