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From: Mel on 19 Oct 2009 16:42
I'm having trouble with an EEPROM and an LCD module hooked to an
AT91SAM7S256. Software is using the at91lib TWI_* routines that came with
an evaluation kit. The program seems to be hanging up on incomplete I/O
with the LCD module, but I don't know why. Analyzing the TWI (aka I2C)
protocol would either nail the problem or assure me that there was nothing
to see there.

Where could I get the use of an analyzer?

Thanks, Mel.

From: steve_schefter on 19 Oct 2009 17:32
On Oct 19, 4:42 pm, Mel <mwil...(a)the-wire.com> wrote:
> Where could I get the use of an analyzer?

I've used www.electrorent.com for a number of pieces of lab
equipment. They have a Mississauga office, but I'm
not sure if they keep any local inventory.

Regards,
Steve
From: Rob Gaddi on 19 Oct 2009 17:47
On Mon, 19 Oct 2009 16:42:37 -0400
Mel <mwilson(a)the-wire.com> wrote:

> I'm having trouble with an EEPROM and an LCD module hooked to an
> AT91SAM7S256. Software is using the at91lib TWI_* routines that came
> with an evaluation kit. The program seems to be hanging up on
> incomplete I/O with the LCD module, but I don't know why. Analyzing
> the TWI (aka I2C) protocol would either nail the problem or assure me
> that there was nothing to see there.
>
> Where could I get the use of an analyzer?
>
> Thanks, Mel.
>

If you've got a 2 channel scope that allows you to get CSV files out,
then a little bit of quick code can decode I2C prety easily. Otherwise
I've been pretty pleased with the Intronix LA1034 at
http://www.pctestinstruments.com/ For south of $400, you'll probably
be hard pressed to rent something any cheaper.

--
Rob Gaddi, Highland Technology
Email address is currently out of order
From: Mel on 19 Oct 2009 21:34
Rob Gaddi wrote:

> On Mon, 19 Oct 2009 16:42:37 -0400
> Mel <mwilson(a)the-wire.com> wrote:
>
>> I'm having trouble with an EEPROM and an LCD module hooked to an
>> AT91SAM7S256. Software is using the at91lib TWI_* routines that came
>> with an evaluation kit. The program seems to be hanging up on
>> incomplete I/O with the LCD module, but I don't know why. Analyzing
>> the TWI (aka I2C) protocol would either nail the problem or assure me
>> that there was nothing to see there.
>>
>> Where could I get the use of an analyzer?

> If you've got a 2 channel scope that allows you to get CSV files out,
> then a little bit of quick code can decode I2C prety easily.

I do, in fact have one of those USB pods - DSO-2250 -- that does that. I've
never used the feature yet, might have been the last thing I thought of.

> Otherwise
> I've been pretty pleased with the Intronix LA1034 at
> http://www.pctestinstruments.com/ For south of $400, you'll probably
> be hard pressed to rent something any cheaper.

Saelig has a ByteMaster LAD-16128U, 16 channel -- about half the capability
for about 3/4 the price. I like the looks, but shipping becomes a major
part of the cost, esp. once the border-crossing charge gets tacked on.


Many Thanks, Mel.


From: Mel on 19 Oct 2009 21:39
steve_schefter(a)hotmail.com wrote:

> On Oct 19, 4:42 pm, Mel <mwil...(a)the-wire.com> wrote:
>> Where could I get the use of an analyzer?
>
> I've used www.electrorent.com for a number of pieces of lab
> equipment. They have a Mississauga office, but I'm
> not sure if they keep any local inventory.

Their web page is a learning curve all by itself. Thanks. I'll follow that
up.

Mel.


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