Re: [Gumstix-users] I/O Capabilties

[Dan N. <Dan...@ro...>]

>Generally speaking, this is more a job for a "microcontroller" as
opposed to "applications" processors.

More or less what I was thinking, thanks for confirming it.  I've
already started down the path of using a microcontroller talking to an
SBC running Linux.  Might consider using the gumstix instead of the SBC.

Thanks everyone who replied.

Dan



  However, the Gumstix COMs do have input captures; if I recall
correctly, the Overo series each have 4 timer pins that can act as PWM
outputs or input captures.

Your other requirements are a perfect fit for the Gumstix COMs.  I would
say that if you want SPI, RS-232, Ethernet and USB, then the Overo
series are ideal, and you probably have to add a separate
microcontroller (connect via simple SPI or UART to the Overo COM) to do
the I/Q, interrupt and digital I/O processing.  The microcontroller
would exchange higher-level information with the Overo.  The Robovero
board is a good example of this scheme, although I don't think the
Robovero has the exact combination of I/O that you want.  You may need
to make a custom board.

Best regards,

	William


On 2011-12-05 01:16, Dan Nelson wrote:
> I've been looking at the gumstix boards and think they might be
suitable for my application. I haven't worked with them before so would
like to get some advice from the list.
>
> I've got a lot of I/O to monitor. The most important bits are from 4
quadrature encoders, 8 signals, interrupt driven. Each of the 4 encoders
would have a maximum frequency of about 200 Hz. Need to count pulses and
look for encoder errors. Is this a realistic expectation in an embedded
linux environment?
>
> I've also got about 24 other I/O to look after (not interrupt driven).
I've had a look at the pins on the connectors and there seems to be
enough I/O, but some of the pins are multiplexed and I'm not sure how
easy it is to get access to them. I'll also be using one SPI port, one
rs-232, Ethernet and USB. Is this board capable of all that?
>
> Third question is how easy is all this to do. Do I need to rewrite
drivers? Can any of this be done from userland, particularly give the
time constraints of the quadrature signals.
>
> Thanks for any comments or suggestions.
>
> Dan
>
>
>
>
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contains a definitive record of customers, application performance, 
security threats, fraudulent activity, and more. Splunk takes this 
data and makes sense of it. IT sense. And common sense.
http://p.sf.net/sfu/splunk-novd2d
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