i2c and Verdex Pro

[VaibhavGhadiok]

Hi everyone

My gumstix is fried working and I was considering getting the Verdex Pro. I gather from the forums that I would need to make all the modifications I had made for the robostix earlier even now. The pull ups for i2c. The resistor for gumstix being able to reset the robostix as well as the 2 jumpers for uisp programming.

I guess there is some power modification for the net pro card which is the same as the one that was used earlier. Attaching the corner pin of the robostix to 5V. So essentially it is the same modifications all over again.

Could somebody confirm if this is right.

What has confused me is this post:
http://old.nabble.com/Verdex-Pro-%2B-Robostix---how-to-read-A2D-ts20003852.html#a20006190

Does the i2c suite of programs not work with verdex pro and robostix. Is there any gumstix currently available in which this will work.

I know I will need to have a new build root and flash the file system. But does anything else change. I was using a basix.

Thanks in advance.

[Dave Hylands]

Hi Vaibhav,

> My gumstix is fried working and I was considering getting the Verdex Pro. I
> gather from the forums that I would need to make all the modifications I had
> made for the robostix earlier even now. The pull ups for i2c. The resistor
> for gumstix being able to reset the robostix as well as the 2 jumpers for
> uisp programming.

You should be able to the use the same robostix with the verdex pro.
The verdex does have som every weak pullups on the i2c bus (IIRC
around 50K or so)

> I guess there is some power modification for the net pro card which is the
> same as the one that was used earlier. Attaching the corner pin of the
> robostix to 5V. So essentially it is the same modifications all over again.

If you do the power mod here:
<http://pubs.gumstix.com/documents/robostix_power.pdf>
to the robostix, then you shouldn't have to attach anything to the net pro card.

> What has confused me is this post:
> http://old.nabble.com/Verdex-Pro-%2B-Robostix---how-to-read-A2D-ts20003852.html#a20006190
>
> Does the i2c suite of programs not work with verdex pro and robostix. Is
> there any gumstix currently available in which this will work.

The i2c program is a generic i2c program for talking with any old i2c
device on the bus. If you know how to formulate the messages, you can
even use the i2c program to talk a robostix which has i2c-io on it, it
just isn't anywhere near as easy as using the i2c-io program on the
gumstix. i2c supports many different messages which can be passed to a
device.

The i2c-io program (on the gumstix) was specifically designed to talk
to the i2c-io program (on the robostix) which is using he
i2c-Bootloader. You can't use i2c-io to talk to say an i2c real-time
clock. i2c-io only uses the "Block" style messages (ReadBlock,
WriteBlock, and ProcessBlock). These are all described in the smbus
protocol specification.

> I know I will need to have a new build root and flash the file system. But
> does anything else change. I was using a basix.

The verdex uses a PXA270, while the basix used a PXA255, so none of
the host programs are directly transferable. The robostix side is
identical.

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

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