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From: "John Jardine"
Subject: Re: Trig circuits
Date: Mon, 23 Dec 2002 14:11:47 -0000
References: <firstname.lastname@example.org> <email@example.com>
NNTP-Posting-Date: 23 Dec 2002 13:58:43 GMT
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Tony Williams wrote in message
> In article <firstname.lastname@example.org>,
> B2431 wrote:
> > Can anyone suggest a book where I can learn to set up cuicuits
> > to repetitively handle a given trig or other math equation?
> I've seen something similar, (airborne magnetometer),
> done with a pre-programmed programmable calculator.
> There was also a thread here recently about using
> calculator chips within equipment. I've lost the
> thread, but seem to remember that perhaps there
> was a modern chip available that was interfaced
> via some sort of serial comms.
> Tony Williams.
I read with interest that thread as well.
Considering the amount of messing about, fiddling and space needed to put
just a couple of (semi) precision trig functions (or even just vanilla "X"
"/") into a micro I've often wondered why a simple calc chip has never been
available to hang on to a couple of the micro pins. 8 pin package, maybe
serial inerface. It would act like a co-pro. The number of times that maths
routines need adding to a micro is legion. I'd infinitely prefer to tack a
'fit and forget' maths chip on, rather than tediously write, pick-n-mix, or
modify existing maths routines. I could then get on with the real
programming for the job at hand.
I can be given a free maths calculator with my petrol. It contains far more
than silicon than I ask for here. I can buy an esoteric, Analog Devices,
Network-analyser-on-a-chip. yet the manufacturers don't see the market
potential for this kind bread and butter type application. Why?.
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