Lpc2000

Hi Lasse,

On Thursday 02 June 2005 00:10, Lasse Madsen wrote:
> I'm planning to use an LPC device as I need some processing
> power, but frankly I'm a bit afraid to use CAN with all the
> talking about bad CAN modules.
>
> 1.
> Is there a LPC with an "OK" CAN module?

I don't know problems, if you only use Standard Identifier 
(11-Bit) and BasicCAN.

Do you want receive all Messages from the 700 units?

> 2.
> The project consists of about 700 units communicating with
> each other. I'm planning to use twisted pair cable, wiring all
> the 700 controllers in series in a large 9 story building so
> there's a lot of cable!

Note, that you need a bus structure for CAN.
But I don't know Transceivers, that can drive 700 nodes.
I think you need additional Gateways.

> 3.
> Does one need CAN bus "amplifiers" when there are so many
> controllers and so many meters of cable?

I don't know amplifiers, only gateways.

> 4.
> I've heard rumors about CAN being fault tolerant, what happens
> if two controllers try to "talk" at the same time? - same as
> RS485 where the communication is messed up?

You means the message arbitration, I think. 
Short, this means, that the transmitter with the lowest Message 
Identifier transmit his message at the first.

> 5.
> On the LPC's there are a CAN "uart" what kind of "transceiver"
> do I need to convert the 3.3V signals to what ever it is CAN
> is using?

On my EVA board from Keil is a TJA1040.

> Sorry for the newbie questions.
Some Links:
CAN Wiki: http://www.can-wiki.info/
CiA (CAN in Automation): http://www.can-cia.org/can/
Submit to a CAN Newslist: http://www.canlist.org/

Hope, this help a little bit.

-- 
Steffen Rose
www.port.de