Subject:
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Re: NXT Firmware source code
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Newsgroups:
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lugnet.robotics.nxt
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Date:
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Mon, 18 Dec 2006 22:26:57 GMT
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Viewed:
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12527 times
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"Steve Lane yahoo.co.uk>" <stevenrobertlane@<nospamplease> wrote in
message news:JABnK0.15z@lugnet.com...
> In lugnet.robotics.nxt, Chris Phillips wrote:
>
> > Still, writing any type of file onto the NXT will eventually wear
> > out the flash
> > memory and lead to failure. If you were to download 30 programs
> > onto your NXT
> > every day, it would start to have problems after about a year,
> > assuming that
> > these specs are correct. Running a data-logging application
> > continuously on
> > your NXT could burn it out even faster.
Fortunately the most common failure mode is a reduction in the
"longevity" of storage. Out of box, the Atmel ARM flash is specified
to retain contents for 40 years. I think most of us could accept an
order or two of magnitude less on this paramter.
There are also two different specs that we're dealing with here. One
is the number of times that complete flash can be rewritten (i.e.
downloading complete firmware and the other is the number of times
that an individual sector can be written (i.e. writing a user program
to flash). I believe the conservative specs for these are 100 and
10,000 respectively.
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Message has 1 Reply:
 | | Re: NXT Firmware source code
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| (...) Not to put too fine a point on it, but the 100 cycle limit is only on the lock bits, I think. This is specified at the extreme limits of voltage and temperature. At normal room conditions, actual NXTs were reflashed (which cycles the lock (...) (17 years ago, 19-Dec-06, to lugnet.robotics.nxt)
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Message is in Reply To:
| | Re: NXT Firmware source code
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| (...) If this limitation had applied to the rcx, I'd have suggested this. Because you can control the outputs and read the inputs direct from a pc you could run an emulation of the rcx firmware running your program on the pc. The rcx would then (...) (17 years ago, 15-Dec-06, to lugnet.robotics.nxt)
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