Re: RYO network

["Frank Mc Alinden" <fmcalind@xxxxxxxxxxxxxx>]

Hi Pete
Dave Mc Laughlin is the best person to ask regarding canbus (he
uses it for his boiler control) although he,s using the Atmel
processors..with the can chips....

>Any good reasons why I should shell out for an ICD 2 (or even switch
microprocessors) and >use pukka CAN?

Just got the icd2 recently so i could start using the 16f88 pics as well as
the18f range ,but currently still using the 16f876 for my xPL
projects....the icd2 isnt that expensive imo.....

> HA? - it's part of my central heating control.

Keep us posted on your progress.....are you coding in assembler or HLL..???

Frank



----- Original Message -----
From: "Pete Shew" <ukha_d@xxxxxxx>
To: "UKHA" <ukha_d@xxxxxxx>
Sent: Saturday, March 26, 2005 9:08 PM
Subject: [ukha_d] RYO network


>
> I've got a requirement to connect a few PICs together and Cat 5 seems
the
logical choice for physical media. However, I need to choose a protocol.
CAN
looks a likely candidate, but I'm working with PIC 17F877A and not the much
nicer PIC 18F458 and don't have the luxury of an inbuilt CAN engine. The
reason - I only have version 1 of the ICD.
>
> I also have space limitations and don't want to add an external CAN
chip.
>
> I don't want a bus master network, though if the case were strong
enough I
could be persuaded., So I've currently got the idea of using CAN bus
drivers
driven using a standard UART with extra logic to detect recessive/dominant
collisions, and with a protocol loosely based on CAN within the limitations
of the hardware. The pseudo code looks like it should work OK, but I know
that debugging is going to be "interesting".
>
> Has anyone else been along this route with success or failure? Any
good
reasons why I should shell out for an ICD 2 (or even switch
microprocessors)
and use pukka CAN?
>
> HA? - it's part of my central heating control.
>
> Pete
>
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>
> Yahoo! Groups Links
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