Subject:
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Re: Brainstorms
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Newsgroups:
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lugnet.robotics
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Date:
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Tue, 13 Aug 2002 01:29:59 GMT
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Viewed:
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783 times
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In lugnet.robotics, Matt Lawrence <matt@technoronin.com> writes:
> On Sun, 11 Aug 2002, Steve Baker wrote:
[snip Philips uC]
> > > My biggest problem with I2C is addressing. Each device needs
> > > needs to have its address pins properly set.
> >
> > Address pins? What address pins?
>
> I think the addressing problem can be solved with random numbers and some
> serious bus scanning. Failing that, burning a serial number into each
> chip isn't that hard either. It would still require quite a bit of bus
> scanning, but even if the startup took several seconds, I don't see it as
> a problem.
The I2C bus is not really designed to support a bus scan.
I'm not saying it can't be done, but I certainly haven't
figured out how to do it. Until I see somebody who gives
an extremely detailed description of how they do it, I will
remain extremely skeptical. No offense is intended here.
Converesly, the SPI bus has a separate chip select per package,
so a bus scan is much easier, although still quite difficult.
-Wayne
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Message has 2 Replies:
 | | Re: Brainstorms
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| Matt Lawrence wrote: > I think the addressing problem can be solved with random numbers and some > serious bus scanning. Failing that, burning a serial number into each > chip isn't that hard either. It would still require quite a bit of bus > (...) (22 years ago, 13-Aug-02, to lugnet.robotics)
| | | Re: Brainstorms
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| (...) Since I had to support hot-pluggable devices on the bus (not my idea), I had to continually scan the bus. Unfortunately, that was several years ago and I don't remember all of the details. It took either a zero-length read or a zero-length (...) (22 years ago, 13-Aug-02, to lugnet.robotics)
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Message is in Reply To:
| | Re: Brainstorms
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| (...) I did a project with the Philips chips several years ago. I2C worked very well, the smallest chip I used was a 87C751. A little bit bigger than an 8-pin chip, but available in surface mount packages. Also, a friend of mine used a 751 as an I2C (...) (22 years ago, 12-Aug-02, to lugnet.robotics)
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