What he has taught is a good lesson. Everyone makes mistakes. I do!
Anyway each mistake will be a lesson to learn from. I rather
learn from ppl's mistakes than from my own*which is expensive and time cons=
uming*.

John


--- On Sun, 10/3/10, Sean Breheny <shb7@cornell.edu> wrote:

> From: Sean Breheny <shb7@cornell.edu>
> Subject: Re: [EE] Hyperterminal
> To: "Microcontroller discussion list - Public." <piclist@mit.edu>
> Date: Sunday, October 3, 2010, 6:07 AM
> Hi Chris,
>=20
> I once spent almost a month trying to figure out what was
> wrong with
> an embedded computer system based on a 68000 processor,
> only to find
> out eventually that my project partner and I had different
> definitions
> of "upper" and "lower" when it came to the two 8-bit wide
> flash chips
> which formed the 16-bit wide program memory for the
> processor. I would
> program them using a homebrew flash programmer and then
> hand them to
> him as the "upper" and "lower" ICs. I took this to mean
> upper and
> lower significance, he took it to mean upper and lower
> address. In
> other words, it was an endian problem.
>=20
> However, I was a high-school senior working with almost no
> test
> equipment - we eventually built a logic analyzer out of a
> FIFO chip
> and discovered that the processor was fetching every
> instruction in
> inverted byte order and we suddenly realized what was
> happening. We
> swapped the two flash chips and it immediately ran most of
> the code
> properly. I think this is a mistake that anyone can make,
> but I
> wouldn't write an article about it for a trade journal and
> I would be
> concerned if it took a professional engineer a month to
> figure it out,
> especially an engineer who is working on military radar
> jamming
> equipment!
>=20
> Sean
>=20
>=20
> On Sat, Oct 2, 2010 at 5:11 PM, Chris McSweeny <cpmcsweeny@gmail.com>
> wrote:
> > I'm loving all the smugness on this thread. Presumably
> nobody on here
> > has ever made a silly mistake?
> >
> > Chris
> >
> --=20
> http://www.piclist.com PIC/SX FAQ & list archive
> View/change your membership options at
> http://mailman.mit.edu/mailman/listinfo/piclist
>=20


     =20
--=20
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist
.