Lpc2000

Hello everybody,

is there realy nobody how had ths problem before. Or is there realy 
nobody how now's a solution.

Thanks Roy

--- In lpc2000@yahoogroups.com, "neptunus1000" <roykrikke@h...> wrote:
> 
> Hello,
> 
> "Was there indeed a pull-up resistor missing on the Olimex board?" 
> YES there was one missing.
> 
> I put for the testing two pull-up on the bus of 4,7K and connected 
to 
> the 3.3 Volt. When I'm debugging the program. The program is still 
> hanging on the while(I2STAT != 0x08);. When I measure the both I2C 
> lines with pull-up, the lines have 3.3 Volt. The program is not 
> working. If I disconnect the pull-up resistor the SDA line is 3.3 
> Volt and the SCL line is 0 Volt. This is oke if I look in the 
schema 
> of the Olimex board. I really don't understand why it is not 
working.
> 
> Of course I can build some code for 'bit-bang', but if the uC has a 
> I2C bus. Then it is ugly to build a 'bit-bang' routine.
> 
> I measured with a FLUKE 123 scope meter.
> 
> Best Regards
> Roy
> 
> --- In lpc2000@yahoogroups.com, "Aalt Lokhorst" <lokhorst@s...> 
wrote:
> > 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@S...
> > ==============================
> > 
> > 
> > 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...
> > >  > ==============================