> We are looking for recommendations for an 8 port rs232 embedded micro.
> The CPU processing requirement is minimal.
>
> Any suggestions?
>
>
Since you didn't mention your cost requirements, it seems to be easily
implementable in a small and "slow" fpga like the EP1C3T100C8 from
Altera or XC2S15-5VQ100C from Xilinx.
Ricardo
Reply by Steve Calfee●June 15, 20052005-06-15
On Mon, 06 Jun 2005 09:34:39 +0200, David Brown
<david@westcontrol.removethisbit.com> wrote:
>Anchor wrote:
>> On Sun, 05 Jun 2005 11:48:33 +0200, Repzak wrote:
>>
>>
>>>"Anchor" <anchorelectronics@sympatico.ca> wrote in message
>>>news:pan.2005.06.04.23.57.05.904979@sympatico.ca...
>>>
>>>>We are looking for recommendations for an 8 port rs232 embedded micro.
>>>>The CPU processing requirement is minimal.
>>>
>>>which baud rate ?
>>>
>>>Kasper
>>
>> 4800 baud
>
>With a bit of thought and care, that should be possible to do in
>software on a small micro, especially if the environment is not too
>noisy (so that you can use 4 times oversampling instead of 8 or 16).
What you need is a reasonably fast micro, and do it all in software.
At that slow a baud rate (x8), you could easily do it all in a Ubicom
ip2k, running at a leisurely 120 Mips. It would be a one chip
solution, unless you need to satisfy the +-12 volt rs232 spec, then
you would need external level shifters.
There is no "x" in my email address.
Reply by Meindert Sprang●June 7, 20052005-06-07
"antedeluvian" <akagan@sympatico.ca> wrote in message
news:TdadnadQGKNRJTjfRVn_vg@giganews.com...
On Tue, 07 Jun 2005 07:06:44 +0200, Meindert Sprang wrote:
>> Anchor wrote:
>> > On Sun, 05 Jun 2005 11:48:33 +0200, Repzak wrote:
>> >
>> >
>> >>"Anchor" <anchorelectronics@sympatico.ca> wrote in message
>> >>news:pan.2005.06.04.23.57.05.904979@sympatico.ca...
>> >>
>> >>>We are looking for recommendations for an 8 port rs232 embedded micro.
>> >>>The CPU processing requirement is minimal.
>> >>
>> >>which baud rate ?
>> >>
>> >>Kasper
>> >
>> > 4800 baud
>
> Aha, smells like an NMEA multiplexer :-)
>
> Meindert
> www.shipmodul.com
You guessed it.
Reply by Anchor●June 7, 20052005-06-07
On Mon, 06 Jun 2005 14:40:09 +0100, Paul Taylor wrote:
> On Sat, 04 Jun 2005 19:57:05 -0400, Anchor wrote:
>
>
>> The CPU processing requirement is minimal.
>
> You say minimal - what sort of thing would the CPU be doing?
Slicing and dicing NMEA data from several simultaneous talkers, repeating
the NMEA sentences in an ordered fashion eliminating the collisions.
Reply by Meindert Sprang●June 7, 20052005-06-07
> Anchor wrote:
> > On Sun, 05 Jun 2005 11:48:33 +0200, Repzak wrote:
> >
> >
> >>"Anchor" <anchorelectronics@sympatico.ca> wrote in message
> >>news:pan.2005.06.04.23.57.05.904979@sympatico.ca...
> >>
> >>>We are looking for recommendations for an 8 port rs232 embedded micro.
> >>>The CPU processing requirement is minimal.
> >>
> >>which baud rate ?
> >>
> >>Kasper
> >
> > 4800 baud
Aha, smells like an NMEA multiplexer :-)
Meindert
www.shipmodul.com
Reply by Peter Jakacki●June 6, 20052005-06-06
Now if you had said 4800 baud right from the start that would of helped
a little bit (vs 115,200 baud). I say a little bit because we (the NG)
still don't know if that is 8 simultaneous full-duplex channels or a
rather mundane 1 of 8 channel mux etc. Yes, based upon the incomplete
information an ARM could handle this ok (slow GPIO is not that much of
an issue here).
*Peter*
BTW, I would love to help more but even my non-technical customers give
me more information than this to go on.
Want specific answers? Supply specific information.
Anchor wrote:
> On Sun, 05 Jun 2005 11:48:33 +0200, Repzak wrote:
>
>
>>"Anchor" <anchorelectronics@sympatico.ca> wrote in message
>>news:pan.2005.06.04.23.57.05.904979@sympatico.ca...
>>
>>>We are looking for recommendations for an 8 port rs232 embedded micro.
>>>The CPU processing requirement is minimal.
>>
>>which baud rate ?
>>
>>Kasper
>
> 4800 baud
Reply by Paul Taylor●June 6, 20052005-06-06
On Sat, 04 Jun 2005 19:57:05 -0400, Anchor wrote:
> The CPU processing requirement is minimal.
You say minimal - what sort of thing would the CPU be doing?
--
Remove _rem_ before replying by email.
Reply by James Morrison●June 6, 20052005-06-06
On Sun, 2005-06-05 at 19:59 +0100, Leon Heller wrote:
> "Anchor" <anchorelectronics@sympatico.ca> wrote in message
> news:pan.2005.06.04.23.57.05.904979@sympatico.ca...
> > We are looking for recommendations for an 8 port rs232 embedded micro.
> > The CPU processing requirement is minimal.
How about a Cypress PSoC? If you get one of the larger ones with lots
of I/O you should be able to instantiate many UART's. I haven't checked
if there is one that can handle 8 but I think the larger ones might.
There will certainly be enough I/O. If there are devices that have
enough digital blocks for the 8 UART's you'll be set for a one chip
solution (for the logic) and a few multi-channel RS232 transceivers.
Cheers,
James.