Re: Recommendations for Linux-based SBC
From: Captain Dondo (yan_at_NsOeSiPnAeMr.com)
Date: 10/25/05
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Date: Tue, 25 Oct 2005 06:16:40 -0700
On Tue, 25 Oct 2005 05:49:11 -0700, dimadiall wrote:
>> > 2) Get current position via GPS (this can be an integrated board, or
>> > one attached by serial port or Bluetooth).
>>
>> If you figure this please let me know. I am looking for an affordable GPS
>> unit... Ideally a serial (RS485) capable, one that can be queried.
>
> I know little (yet) about RS-485, but stuff from sparkfun.com I was
> looking at seems affordable to me and probably there is a way to hook
> it up for your application. Check their GPS units here:
> http://www.sparkfun.com/shop/index.php?shop=1&cat=63&
Thanks for the link. I'll forward it to the guys working on the GPS end
of things... (My job is just to make everything talk to everything else,
including the operator....)
RS485 is a serial bus... It communicates much the same was as RS232, but
you can have 32 units on a single serial port (actually more, but that's
what the spec says) and it can be used for much longer distances. It only
takes 2 wires, and is mostly immune to noise.
>> > 5) All these components should be supported under GNU/Linux -- which
>> > embedded distribution and development environment would you recommend?
>>
>> Standard Debian works well for me....
>
> How small is your base OS (or how big is your CompactFlash)? Did you
> ever try with other embedded distros (e.g. EmDebian)?
>
> Do you have any experience with their own distro (TS-Linux)? Does it
> support all included components out-of-the-box?
>
They provide a kernel and source which supports all of the stuff on the
board. They also provide sample user-space apps for accessing various
things. All in all it's a pretty neat package, and it works really well.
I'm impressed so far.
I have not played with TS-linux, opting instead for the debian install
they provide, along with the cross-tool kit. The cool thing is that they
don't change more than they have to, so you can pretty much use anything
you want with the exception of the kernel....
I like debian because it comes in every flavor you can want. We will
probably port our stuff to x86 as well as ARM so that we have
multi-platform support (our life cycle is such that end-of-life for ARM
and x86 is a concern).
I am hoping to get my apps+OS into 8MB. That might be a stretch, seeing
as I have to have RS232+RS485 support, a windowing system to drive a QVGA,
communications with modbus equipment and propriatary PLCs, VPN, ethernet
(both UTP and PPP over radios), two GPS units, a compass, a cell phone, a
web server and a way to generate dynamic web pages, and enough smarts to
generate the web pages for either a PC or a cell phone, SMS messaging,
HMI with keypad and joystick support.... You get the idea....
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