Re: Few questions on embedded stuff

From: Paul E. Bennett (peb_at_amleth.demon.co.uk)
Date: 06/25/04 

Date: Fri, 25 Jun 2004 21:32:01 +0100

zalzon wrote:

> Hi,
> How much do you embedded guys need to know about analog circuit design?
> I asked one guy and he said most embedded engineers know little about
> analog circuitry. Usually they look at application notes on how to build
> sample circuits. Is this true?

It is important for embedded systems designers to understand analogue
circuitry in quite some detail in order to develop the most appropriate
interface to the real world. The real world is a rough, harsh place and
knowing how to provide limiting, protection clamping, frequency and spike
filtering and matching highly reactive transmission lines is a necessary
part of getting a well behaved embedded system. The analogue topic is
probably more significant than the digital hardware aspects.
 
> Also what real-time OS do most of u guys use? Is it mostly used on single
> board computers?

Forth with either round robin, pre-emptive scheduling (I have used both
simultaneously in a few project).
 
> Finally, why are there so many different vendors selling single board
> computers. Do they all custom build their stuff, is there no standard?

Look at the details of the cards and you find that the resources available
on each one vary quite markedly. It is nice having a choice of
architectures and I/O resources. The systems engineers selecting for the
application domains they deal in should be the only ones to make the
rationalisation choices. 

-- 
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