Re: RYO network

[Ake Hedman <akhe@xxxxxxxxxxxxx>]

Pete,

Not a direct answer to your question but if you decide in the future to=20
use one of the Microchip CAN enabled controllers you can use VSCP and=20
have some free open code available at http.//www.vscp.org/vscp. Much of=20
it can be useful even if you decide for some other HLP then VSCP. There=20
is also Atmel + SJA1000 code available there if you decide to switch=20
processor.

To build the CAN logic yourself probably with be an interesting and fun=20
exercise. The CARACA project ( http://caraca.sourceforge.net/)
have done=20
this. With all the low cost uP's with CAN logic on board I personally=20
can't see other reasons to do this then for the fun of it.

>ICD2...
Even if its limited in many ways the ICD2 is a great buy. Its saves a=20
lot of time when debugging.  After you get used to it you wounder how=20
you could be without it. The integration with Microchips C compiler=20
(other compiler brands to of course) is also nice. Now with the free=20
student edition this is a tool that are available also for hobbyists=20
being quite high cost for hobby use before.


Cheers
/Ake


Frank Mc Alinden wrote:

> Hi Pete
>             Dave Mc Laughlin is the best person to ask regarding=20
> 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=20
> 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=20
> 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=20
> seems the
> logical choice for physical media. However, I need to choose a=20
> protocol. CAN
> looks a likely candidate, but I'm working with PIC 17F877A and not
the=20
> 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=20
> chip.
> >
> > I don't want a bus master network, though if the case were
strong=20
> enough I
> could be persuaded., So I've currently got the idea of using CAN
bus=20
> drivers
> driven using a standard UART with extra logic to detect
recessive/dominan=
t
> collisions, and with a protocol loosely based on CAN within the=20
> 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=20
> microprocessors)
> and use pukka CAN?
> >
> > HA? - it's part of my central heating control.
> >
> > Pete
> >
> >
> >
> >
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
> >
> >
>
>
>
>
>
>
> *Yahoo! Groups Sponsor*
> ADVERTISEMENT
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>
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--=20
---
Ake Hedman (YAP - Yet Another Programmer)
eurosource, Brattbergav=E4gen 17, 820 50 LOS, Sweden
Phone: (46) 657 413430 Cellular: (46) 73 84 84 102
Company home: http://www.eurosource.se=20=20=20=20=20=20
Kryddor/Te/Kaffe: http://www.brattberg.com
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Automated home: http://www.vscp.org



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