RE: headers for breakout-gs

If in fact the breakout-gs has both LCD and PWM, this would be good news for
me, so I'd like to find out for sure.  I don't need more than two PWM
channels and the onboard PXA signals are preferred.  For my project I will
be running PWM outputs to a couple of dedicated PID controllers and on thru
H-Bridges to the motors.  There isn't anything on the robostix that helps me
with that, plus I can't give up the LCD.  Also, I don't like the idea of
running wires out of the vias on a tweener to get my PWM/LCD signals since
all these wires would be surrounding the hirose connector in between the
other two boards when I try to plug all three boards together.

Respectfully,

John Alfredo
Patiently waiting to hear that PWM are on the breakout-gs


-----Original Message-----
From:   gumstix-users-admin@xxxxxxxxxxxxxxxxxxxxx
[mailto:gumstix-users-admin@xxxxxxxxxxxxxxxxxxxxx] On Behalf Of Doug
Sutherland
Sent:   Wednesday, July 13, 2005 5:35 PM
To:     gumstix-users@xxxxxxxxxxxxxxxxxxxxx
Subject:        Re: [Gumstix-users] headers for breakout-gs

Don,

There are a few other things that should be fixed on the site for
breakout-gs.

Site error: the expansion board specs page lists the breakout-gs signals as
AC97, NSSP, FFUART, HWUART, and STUART, but there are more on the board:
the
LCD and I2C signals, and there is another set that seems to have two pulse
width modulation (PWM0 and PWM1) and what appears to be hardware UART flow
control signals RTS and CTS.

http://www.gumstix.com/spexExpnsion.html

Question: which UART are these flow control (CTS/RTS) signals associated
with?
I was surprised to see PWM signals since those are on the Robostix, it
would
make more sense to either have more flow control for another UART or
handshaking
signals (DTR/DSR). Are those really PWM signals?

Site error: the breakout-gs product page says there are twenty four
50mil pitch
holes, but there are a lot more:

AC97          8 (8 signal)
NSSP          6 (4 signal, 2 power)
FFUART        4 (2 signal, 2 power)
STUART        4 (2 signal, 2 power)
HWUART        4 (2 signal, 2 power)
I2C           4 (2 signal, 2 power)
LCD          20 (20 signal)
PWM/RTS/CTS   6 (4 signal, 2 power)

That's 56 through holes, and there are two more next to the power connector
labelled V_BATT and GND. Of the total 58 through holes, 44 are signal.

http://www.gumstix.com/oscommerce-2.2ms2/catalog/product_info.php?products_i
d=140

The above page also doesn't mention the additional signals (LCD, I2C,
PWM/RTS/CTS).

Question: The two holes next to the power connector (V_BATT/GND), are these
the jumper for enabling power from USB connector intead of power jack?

Question: The spec I saw mentioned a footprint for a "ferrite bead (or R0)
that feeds V_BATT from USB_5V". Is this footprint on the breakout-gs? I'm
confused whether these two pins are the jumper or the ferrite location. I
don't see a footprint anywhere else.

Suggestion: Since there is confusion due to mislabeling of signals (errors
in the silkscreen), I think you should list all of the breakout-gs pinouts
on the schematics page. It would be best if there was a diagram on the
board that should locations (example: CN1, CN2, CN3, etc) so it's clear
where the ports are. There should also be mention that the Vcc pins are
not 3.3v in the current version of the board, instead they are equal to
the supply voltage. It would be nice if there was a schematic for the
breakout-gs also, since this will be the primary interface to any custom
hardware unless custom carriers or robostix are used. Have you considered
making a PDF User manual with all of the pinouts and such? The way the
wiki is arranged it's not very easy to find information.

Site error: the schematics page says "Also note: the tweener cannot work
with
the breakout boards or the thumbstix due to components getting in the
way of
the connection." I believe this only applies to the old breakout boards,
the
new breakout-gs can be used with the tweener.

http://www.gumstix.org/tikiwiki/tiki-index.php?page=schematics

  -- Doug


Don Anderson wrote:

> Doug
>
> the brfeakout-gs picture is correct but that text in the wiki was not
> accurate. thanks for picking this up.
>
> The text has now been corrected:
>
> The breakout-gs board is 80mm x 20 mm. The breakout-gs does not have
> any headers installed.
>
> on this page in the wiki
> http://www.gumstix.org/tikiwiki/tiki-index.php?page=schematics
>
>
> Don
> +++++++++++++
>
> At 6:41 PM -0400 7/12/05, Doug Sutherland wrote:
>
>> Oops I didn't see this before, the specs page says "The breakout-gs
>> board is
>> 80mm x 20 mm and comes with headers pre-installed." I thought they
>> were just
>> through holes because that's what the photo shows.
>



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