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.

On Oct 19, 4:42=A0pm, Mel <mwil...@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

On Mon, 19 Oct 2009 16:42:37 -0400
Mel <m...@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

Rob Gaddi wrote:

> On Mon, 19 Oct 2009 16:42:37 -0400
> Mel <m...@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.

s...@hotmail.com wrote:

> On Oct 19, 4:42 pm, Mel <mwil...@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.

Rob Gaddi wrote:

[...]

>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.

Consider also the DigiView DV1-100
http://www.tech-tools.com/dv_main.htm - it has much more memory (but a
simpler input circuitry).

Oliver
-- 
Oliver Betz, Munich
despammed.com might be broken, use Reply-To:

Mel 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.

Firstly, you didn't say which LCD module and EEPROM. Doing so might have got 
a wider response already.

Secondly, Logic Analysers are expensive to own and hire so doing the job 
without is really a very worthwhile skill that more should learn to 
cultivate.

If these are serial devices I would expect to see the traces on a scope 
easily enough. Have you got one that can capture a segment of data from pre-
trigger point to post-trigger point (Fluke and Tektronix both do a suitable 
type). Such a scope will allow you to scroll back through the problem zone 
to see what was happening in detail.

Also learn to instrument the code (toggle a pin with the idle task or 
something) so that you can pick up points of failure. 

-- 
********************************************************************
Paul E. Bennett...............<email://P...@topmail.co.uk>
Forth based HIDECS Consultancy
Mob: +44 (0)7811-639972
Tel: +44 (0)1235-510979
Going Forth Safely ..... EBA. www.electric-boat-association.org.uk..
********************************************************************

I've been looking for a good oscilloscope front end for a PC, but I
haven't found anything I think is worth the price.  There are a few
units that can do both scope and logic analyzer which would be ideal
for me, two channels of analog and 16 to 32 channels of digital.  Can
anyone recommend something in this line?

Rick


On Oct 19, 4:42=A0pm, Mel <mwil...@the-wire.com> wrote:
> I'm having trouble with an EEPROM and an LCD module hooked to an
> AT91SAM7S256. =A0Software is using the at91lib TWI_* routines that came w=
ith
> an evaluation kit. =A0The program seems to be hanging up on incomplete I/=
O
> with the LCD module, but I don't know why. =A0Analyzing the TWI (aka I2C)
> protocol would either nail the problem or assure me that there was nothin=
g
> to see there.
>
> Where could I get the use of an analyzer?
>
> =A0 =A0 =A0 =A0 Thanks, =A0 =A0 =A0 =A0 Mel.

Mel 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.
> 

On the basis that you'll almost definately need it again, renting is a 
bad investment and just dead money. You could buy a good used la on ebay 
for a fraction of what it would cost you to rent for a month, or even 
from a dealer.

Depending on speed requiremnts, an HP 16xx series might be enough, or 
better still, one of the system type HP16500 or 16700 series. The latter 
were 25 to 50k $ new and more or less last forever...

regards,

Chris

Mel 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.
>

Yikes, buy, don't rent.  We have a DigiView from Tech-Tools that we love. 
$500 at http://www.tech-tools.com/dv_main.htm.

This is phenominal logic analyzer.  Does data interpretation and lots more.

-- 
Scott
Validated Software
Lafayette, CO 



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