Re: [opendiag] Re: K Line Problem

Hi Ezequiel,

>This is becuase my program (a Atmel AVR M128 microcontroller with
>Graphic Display) halts when I accelerate the engine.
Whow, much of artilery for building it on Protoboard...

>This produces noise
No, it doesn't !!!
K-Line is noise-free, or has a same level of noise at idle and at any random RPM.
Why is that so ? Simply because the factory did all the work with K-Line noise-filtering and disturbance.
Offcourse, the whole story ends at diagnose-connector, but if You don't have noise at connector, how
should there be so much noise at your scanner ???

>That's why I supposed the problem
>is noise on the K line. Also, I have tested all the proyect without
>the engine on, and the communication works perfectly.
Yes, but engine on and off is quite a difference in CPU-usage...
K-Line has the lowest priority, therefore You get a proper answer with proper timing only if CPU has enough
time between other tasks with higher priority.

>and I "see" (I have a monitor led on the K Line, so I see each
>byte sent and received - very quicky - but it's a nice way of
>wathcing the communication)
How does Your led know what is a byte and what is a bit ?

> that the ECU sends a byte 3 times
If You communicate with VASS using KWP1281, You must send complement of any received byte back to ECU -
- did You, and if yes, what byte ?

>with a large delay before disconecting.
How do You know when ( exactly ) You are disconnected ?

>Another question. Is there any way I can get RPM in a faster way
>than reading a block of 4 data?
Yes, send function 0x08, channel 0x01.

>P.D.: If anybody is interesting in sharing info, and schematics,
>please send me an e-mail.
I thought, that should be done in this group, not privately...

bye,
Bole

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Received on Mon Dec 22 00:24:16 2003