Lpc2000

embeddedjanitor wrote:

>
> --- In lpc2000@yahoogroups.com, "Anton Erasmus" <antone@s...> wrote:
> > On 10 Mar 2005 at 20:29, artturi wrote:
> >
> > >
> > > Hello
> > >
> > > I'm quite new with LPC-family and microcontrollers too so:
> > > I'm having trouble with example LPC2_FullCAN_v110 which I got from
> > > this group files. I'm using LPC2194 and I haven't changed basic
> code
> > > at all. The problem is that the ISR won't arrive. I checked with
> scope
> > > that the message is sended but it don't cause interrupt to get the
> > > message to FullCAN list. Is 2194 capable to receive messages in
> > > "full-duplex" mode? Do I need external transiver while I'm working
> > > with only one 2194? Maybe I have done some rookie mistake but hope
> > > someone can turn me to right path.
> > >
> >
> > In general you need a Reciever when working with CAN. It is not like
> a UART,
> > where you can transmit to nowhere, and check with a scope to see if
> it is working.
> > In CAN if you transmit, and there is nothing to receive the message,
> the CAN
> > controller will retry a number of times, and then disable it's
> transmitter and go
> > into fault mode.
>
>
> The first thing to determine is how your two CAN controllers are
> hooked up. Normally you'd do this by making a bus and using a
> transceiver on each CAN port. The bus also needs termination resistors
> etc. This is most likely what you'd do with an evaluation board.
>
> For connections on a single board you can just use a single wire
> open-collector setup without transcievers.  To do this, make a single
> wire "bus" with a pull-up resistor. Hook all the receive lines to
> this. Hook all the tx lines to this through diodes.
>
> To get a valid send you need to have at least two CAN controllers
> connected together and configured. This is because the sending CAN
> controller needs to see an acknowledgement from a receiving
> controller. The receiving controller does not have to accept the
> message, but it must be confgured for the correct bit rate etc.
>
>
I've been trying to solve the problem using pull-up resistor method. 
After many dissapointments it occured my mind that can the offset 
register differ from each other in LPC family so much that example needs 
lot of modification to get it work? Would it be easier to start building 
own code than try to get this work?

>
>
>
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