Re: [Gumstix-users] A few Connex questions

[Dave H. <dhy...@gm...>]

Hi Lee,

I know some of the answers to your questions.

> 2) Sometimes the system will not boot at all unless the serial line is
> connected. (I can connect to the serial line through the robostix
> module, but normally I'd rather just use the ethernet).
>
> I seem to remember having a little connector I would put on there
> when I wanted to run the system without connecting to the serial
> line, but I can't find it now.
>
> Does anyone remember anything like this?

See this page:
<http://docwiki.gumstix.org/index.php/Robostix_modifications>
In particular, the pullup resistor section.

> 3) This is more of a robostix question... I'm not sure how much that
> has changed since the connex days.
>
> I have several servo programs which I can load from the connex to
> the robostix and run successfully. However, I can only get servo
> outputs 3A, 3B and 3C to operate.
>
> Also, it seems like the 3A and 3C outputs are switched compared
> to the code. Strangely, if I change the values in Common/Servo.h
> the servos are still switched.

Yeah - there is mention of that on this page:
<http://docwiki.gumstix.org/index.php/Robostix_I/O_pins>

On revision 1131, the silkscreen on the board is incorrect.

> So, is there some additional setup that needs to be done before I can
> access servos 1A, 1B and 1C?

You need to call:

    InitServoTimer( 1 );


> And how can I make SetServo(SERVO_3A, ...) affect servo 3A instead
> of servo 3C?

Swap the labels 3A and 3C on the silkscreen :)

> 4) Finally... I am using an old buildroot checkout at r1361. I tried
> updating to the most recent svn but was unable to build on my
> Ubuntu 9.10 system.
>
> I see that there is now an OpenEmbedded option for building
> software for the connex.
>
> Will I be better off moving over to the new oe system, or is it
> best to just stick with the (mostly working) buildroot checkout?

I suspect for the connex, you'll be better off sticking with
buildroot, and figuring out why you're getting failures.

You might want to fire up a virtual machine and go bad to an older ubuntu.

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