Lpc2000

Hello Roy,

Was there indeed a pull-up resistor missing on the Olimex board?

If you can measure low and high levels on both I2C lines now then I 
expect that the hardware is fine. If there is also a I2C device on the 
bus and it is still not working then i assume it is a software problem.

In the past I used I2C on a 8051 with some 'bit-bang' routines. Until 
now I didn't use the I2C of the ARM. This will change in the next few 
weeks but for the moment I can't help you.

In the files section of the yahoo group are some examples. If the 
pull-up indeed was missing in the hardware then you probably spend a lot 
  of time with software debugging without any change to succeed.
Might be the moment to start debugging again, use an oscilloscope if you 
have it and study the signals to see where it fails.

Best Regards
Aalt,


-- 
==============================
Aalt Lokhorst
Schut Geometrische Meettechniek bv
Duinkerkenstraat 21
9723 BN Groningen
P.O. Box 5225
9700 GE Groningen
The Netherlands
Tel: +31-50-5877877
Fax: +31-50-5877899
E-mail: Lokhorst@...
==============================


neptunus1000 wrote:
> 
> Hello Aalt,
> 
> with on both lines a pull-up the code is still not working oke.
> Please help my.
> 
> --- In lpc2000@yahoogroups.com, "Aalt Lokhorst" <lokhorst@s...> wrote:
>  > Hello Roy,
>  >
>  > Is there a pull-up on the SCL line? I can't find it in the
> schematic
>  > drawing but probably I missed it.
>  >
>  > As far as I know both lines need a pull-up because SDA and SCL
> lines are
>  > 'open-drain' outputs.
>  >
>  > Best Regards,
>  > Aalt
>  >
>  > --
>  > ==============================
>  > Aalt Lokhorst
>  > Schut Geometrische Meettechniek bv
>  > Duinkerkenstraat 21
>  > 9723 BN Groningen
>  > P.O. Box 5225
>  > 9700 GE Groningen
>  > The Netherlands
>  > Tel: +31-50-5877877
>  > Fax: +31-50-5877899
>  > E-mail: Lokhorst@S...
>  > ==============================