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DIY SECU-3 micro questions

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Zastava128

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Post 15 Dec 2018, 22:45

Re: DIY SECU-3 micro questions

Hello.
Thank you very much. That's very kind of you.
Unfortunately I'm a jackass.
I think there is no factory crank pulley for the conversion of old D.O.H.C.
The example I found was made by the same guy who shared those ignition maps on the polish forum.

It seems that the pulley is for two belts.
Maybe it's a little diffrent by the one on the 1608 block.


To use a factory trigger wheel from a later D.O.H.C engine you must swap all pulleys and belts if I'm not wrong.
Bye.
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1608cc

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Post 09 Jun 2019, 14:47

Re: DIY SECU-3 micro questions

Another question to STC ;)

Did You try to use K-Line (ISO9141) protocol instead RS232 ?
I want to add L9637 interface, and I think software must be different then... Hardware won't be a problem.
L9637 is also good idea, because it has additional L-Line converter - it would control bootloader pin.

What do You think about it ?

Thanks :)
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STC

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Post 09 Jun 2019, 23:18

Re: DIY SECU-3 micro questions

Maybe in the future. I have a lot of other tasks for next months. I suggest you to develop k-line adapter which will convert SECU protocol to k-line protocol. Of course, not all parts of the SECU protocol can be converted into k-line.
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1608cc

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Post 10 Jun 2019, 18:02

Re: DIY SECU-3 micro questions

Time is not a problem - if in the future K-Line will be add it is worth to wait :D
Last edited by 1608cc on 12 Jun 2019, 19:35, edited 1 time in total.
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STC

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Post 12 Jun 2019, 12:11

Re: DIY SECU-3 micro questions

1608cc wrote:Time is not a problem - if in the future K-Line will be add it worth to wait :D


Which functions you want to be implemented via K-line interface? The problem is that SECU communicates using duplex mode (incomming and outcomming data sent simultaneously). As far as I known, K-line interface doesn't support duplex mode. It is relatively simple to implement just logging (collecting data from SECU).
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1608cc

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Post 12 Jun 2019, 19:32

Re: DIY SECU-3 micro questions

STC wrote:Which functions you want to be implemented via K-line interface? The problem is that SECU communicates using duplex mode (incomming and outcomming data sent simultaneously). As far as I known, K-line interface doesn't support duplex mode. It is relatively simple to implement just logging (collecting data from SECU).


Yes You right, K-Line is Bi-Directional Half-Duplex bus - so in this case it won't work, if I connect interface straight to UART :|

I want all functions will be implemented - not only logging. So now only way is waiting for full support of K-Line interface in the future ;)
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STC

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Post 12 Jun 2019, 21:06

Re: DIY SECU-3 micro questions

Yes. And use interface IC like this https://www.nxp.com/docs/en/data-sheet/MC33660.pdf
Author of the SECU-3™ project http://SECU-3.org. An open source engine control unit / Ignition control system, (C) 2007.
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1608cc

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Post 12 Jun 2019, 21:28

Re: DIY SECU-3 micro questions

STC wrote:Yes. And use interface IC like this https://www.nxp.com/docs/en/data-sheet/MC33660.pdf


I will use L9637 - it's better than MC33660, because it has additional L-Line comparator I will use as "bootmode switch"
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STC

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Post 12 Jun 2019, 21:40

Re: DIY SECU-3 micro questions

1608cc wrote:
STC wrote:Yes. And use interface IC like this https://www.nxp.com/docs/en/data-sheet/MC33660.pdf


I will use L9637 - it's better than MC33660, because it has additional L-Line comparator I will use as "bootmode switch"


Thank you for information.
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