cheap obd2 scanner

[Paul Blackmore]

Hi Len,

When I said I was having a few teething problems I was referring to getting the
PC to react fast enough to "see" the VPW pulses - even at 10.4Kbs.

I don't think it will be possible to read 41.6Kbs but if I sort out the 10.4KBs,
I'll give it a go.

The clock I am using (on my pentium) is only about 1.2Mhz which means I can
probably see pulses at 20 micro seconds, with some accuracy - given the lag of
servicing an interrupt (about 10us). At 41.6Kbs we're looking at pulses about
20-50 micro seconds so it probably wouldn't be 100% accurate.

Or I could write the whole thing in assembler :-P

It'd be best left to a pic type circuit which is also in the works.

Cheers
Paul

Date: Wed, 29 Aug 2001 22:16:12 -0400
From: Len Sabatine <sabatine at epix.net>
Subject: Re: cheap obd2 scanner

     Paul , Make your virtual device driver switch to 41.6Kbs , You'll become a
     Hero in short order. Then things become easier for folks to monitor
a  Flash
     programming session , or other in VPW  hi speed mode.
     In real terms , This isn't easily accomplished in software only , Good
Luck !!
     Len




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