There are about 90 something codes, the only way I could see of doing it
would be to have lots of tables, and say.. in the example of the code being
25:
x being 2, y being 5


PC+x
;1  goto sub fir1
;2  goto sub fir2
;3 goto sub fir3

-----------------
sub fir2
PC+y
....
;4 z=1
;5 z=2

then it jumps back to where the lookup was first called and the value of z
used in a final lookup to return the error string to the LCd.

Is this what you menat?  Sorry for the rushed example and crap typing but im
just going out the door b4 im late for work..

Jsutin.


----- Original Message -----
From: "Nick Veys" <nick@VEYS.COM>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Wednesday, June 20, 2001 2:19 PM
Subject: Re: [PIC]: 16F84 project for newbie....


> To detect lengths of time elapsed you can use your TMR0 module.  Figure
out
> how long of a delay it is to signify the code is complete and watch for
it.
> To get 1 & 2 to be 12, simply make code detect that sequence, there can
only
> be a few error codes, so you could just code for each one if you wanted,
to
> brush up on your assembly :)
>
> nick@veys.com | www.veys.com/nick
>
> > -----Original Message-----
> > From: pic microcontroller discussion list
> > [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Justin Fielding
> > Sent: Wednesday, June 20, 2001 8:04 AM
> > To: PICLIST@MITVMA.MIT.EDU
> > Subject: [PIC]: 16F84 project for newbie....
> >
> >
> > I am a newbie to Pic's (just got to the interrupts section in the
> > Easy Pic'n book) and have thought of a great little project.  I
> > want to make a fault reader for my car's ECU.
> >
> > If the ECU detects a fault (can be simulated by disconnectiong
> > something) then it pops the warning light on.  You can then (bit
> > of a quick hack) conect an LED accross two of the pins on the
> > diagnostics port and short two out and it will flash a code on the LED.
> >
> > It first flashes 1 2 to let you know it is working, then the
> > fault, say 2 6 and then 1 2 again.
> >
> > Trouble is it does this in a rather strange way, in the above
> > example it would.
> >
> > Flash the LED once
> > Short pause
> > Flash the LED Twice
> > Long pause (so the above was "1" then "2" but this should be read as 12)
> > Flash LED Twice
> > Short pause
> > Flash the LED six times
> > Long pause ( representing "2" then "6" or 26)
> > and so on.....
> >
> > I would like to use an F84 with an input from the ECU (from where
> > the LED goes) and then a LCD display to show what the fault is
> > (use a lookup table here).
> >
> > Problem is how do I know the difference between the long and
> > short pause (so I can stop counting flashes and move to the next
> > digit) AND the big how... How do I turn "1" & "2" into 12 (for
> > use in the lookup table)?
> >
> > Any help or tips from similar projects would be appreciated.
> >
> > Thanks.
> >
> > Justin.
> >
> > --
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> >
> >
> >
>
> --
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>
>

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