Hello again Dave,

> The FFUART is the linux console, so all of the bootup messages will be
> sent to the robostix. No reason why you can't use it, you just need to
> be aware of what's going where.

Good to know, this will definitely impact my plans.

> When you power up the robostix and the verdex together, then the
> robostix gets held in reset.

That was precisely the problem. I am not only able to retrieve the data form Flash-LED with sertest but my programs work too!

> Supplying power through the barrel jack will power both the gumstix
> and the verdex.

Does this mean I cannot power the boards using the BOARD connector?

> Hopefully, the above links will prove useful.

Yes, yes they did.

Thanks again,
Dustin Webb


From: Dave Hylands <dhylands@gmail.com>
To: General mailing list for gumstix users. <gumstix-users@lists.sourceforge.net>
Sent: Wednesday, August 12, 2009 8:02:33 PM
Subject: Re: [Gumstix-users] Gumstix, Robostix, and Serial Communication

Hi Dustin,

On Wed, Aug 12, 2009 at 5:40 PM, Dustin Webb<dustinjwebb@yahoo.com> wrote:
> Hi Dave:
>
>> If you build a little jumper block
> I'm using a cable but it has the same basic configuration.
>
>> then that will connect UART-0 on the robostix to the STUART port on the
>> gumstix.
>
> Is it required that I connect the Verdex to the Robostix via the STUART or
> can I use the FFUART? This is really just intellectual curiosity. I have no
> problem using the STUART instead of the FFUART so long as I can use the
> FFUART to communicate with my SSC-32. I believe this is possible but I'll
> have to test it to be sure.

The FFUART is the linux console, so all of the bootup messages will be
sent to the robostix. No reason why you can't use it, you just need to
be aware of what's going where.

>> The Flash-LED program on this page
>> You can use the sertest program on the gumstix at 38400 baud to read the
>> data
>
> Got them and compiled them successfully and in the case of the Flash-LED I
> had no problem loading it onto the Robostix. Now this is where it gets
> interesting. I notice that if I do not connect the two boards the LEDs on
> the Robostix flash. If I connect the two boards then the LEDs on the
> Robostix do not flash if I apply power through the barrel connector on the
> Robostix. They do flash though if I apply power through the BOARD port on
> the Robostix however in this configuration the Verdex does not power up.
> Needless to say, when the Verdex does power up I get nothing from the
> Robostix via sertest.

When you power up the robostix and the verdex together, then the
robostix gets held in reset. Supplying power through the barrel jack
will power both the gumstix and the verdex.

There are a number of things that you can do on the verdex to get the
robostix running, depending on how quickly you want it to start
running. I cover the basic approaches on this page:
<http://docwiki.gumstix.com/index.php/Robostix_power>

> Now for a little history. I have revision 1131 of the Robostix. As such,
> since I wanted to develop my program without the Verdex inline, I installed
> a pullup resistor in accordance with the Robostix Modifications page
> <http://docwiki.gumstix.org/index.php/Robostix_modifications#Pullup_Resistor_.28applies_to_all_revisions_-_upto_and_including_1131.29>.
> However this was not enough to get my Robostix working without the Verdex. I
> also had to install a jumper between pin 6 on the UARTs header and +5V on
> the BOARD connector. I found this fix on the mailing list though I cannot
> recall where exactly. Suffice it to say it worked. At this point I am
> wondering if one or both of these modifications are problematic.

You probably saw it on this page:
<http://docwiki.gumstix.com/index.php/Robostix_modifications>

> The documentation you have already compiled has proven quite useful and I
> want to thank you for that. With that said any additional help you can
> provide would be highly appreciated. I am quickly approaching my deadline
> for this project and this is one of the last tasks I must perform to
> complete it.

Hopefully, the above links will prove useful.

--
Dave Hylands
Shuswap, BC, Canada
http://www.DaveHylands.com/

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