Lpc2000

Thanks, Gilles. Do you mean that free RTOS already handles entering 
the processor's idle mode off-the-box? Or should I mod it in order to 
achieve that? Does the 2106 port applies to 2138 without needing any 
modifications?

Guille

--- In lpc2000@yahoogroups.com, "Gilles FAURIE" <gilles.faurie@p...> 
wrote:
> Hello,
> 
> You can try free RTOS.
> 
> http://www.freertos.org/
> 
> 
> ----- Original Message ----- 
> From: "guillermoprandi" <yahoo.messenger@m...>
> To: <lpc2000@yahoogroups.com>
> Sent: Thursday, October 06, 2005 3:21 PM
> Subject: [lpc2000] Re: Low power multithreaded OS suggestion?
> 
> 
> Thanks a lot. Looks very interesting. I'll look into it. However,
> some preemptive multitasking is needed in my project since I must be
> able to perform some lengthy calculations in one task while still
> serving other tasks.
> 
> Guille
> 
> --- In lpc2000@yahoogroups.com, Marko Panger <marko.panger@s...>
> wrote:
> > Hi there,
> >
> > I just finished a project with the same problem. For the third 
UART
> I've used a SW made uart via GPIOs and it works @ 115200 baud rate.
> >
> > As for the OS I used mine, uSmartX. The OS can inform you when
> there is nothing to do (scheduler reurns SYS_IDLE) and I'm idling 
the
> CPU at that point. My power consumption dropped for ~30%.
> >
> > If you want visit http://usmartx.sourceforge.net/ for more
> information regarding the OS.
> >
> > Hope it helps,
> > marko
> >
> > >
> > > Od: "guillermoprandi" <yahoo.messenger@m...>
> > > Datum: 2005/10/06 Èet PM 02:37:46 CEST
> > > Za: lpc2000@yahoogroups.com
> > > Zadeva: [lpc2000] Low power multithreaded OS suggestion?
> > >
> > > Hi! I am building a board featuring the LPC2138 ?C. This board
> will
> > > basically need to interface with three serial devices (two via
> > > internal UARTs and a third via MAX3100, though suggestions are
> > > welcomed about this). This device must be very low power; it
> should
> > > wake up only when needed, which is: 1) there's data available
> from
> > > any of the three ports, 2) there's data waiting to be 
transmitted
> on
> > > any of the ports and the port becomes free and 3) a periodical
> > > overall check (every second or so). This means that 
theoretically
> the
> > > processor can enter the idle state quite often. I'm looking for
> some
> > > (free if possible) multithreaded OS that would handle the
> transition
> > > to the processor's idle state on traditionally blocking calls
> like
> > > fread() and fwrite(), expecting to wake up on interrupt; also,
> some
> > > preemptive multitasking should be supported, in case some thread
> > > enters an exceptionally long calculating task. Probably there's
> no
> > > known OS that directly supports this; in this case, I'd like to
> know
> > > which other OS might be a good starting point to accomplish this
> by
> > > making the modifications myself. I'm aiming to use the GNU
> libraries
> > > (I ignore how difficult or messy would it be to modify them to
> > > support this). Finally, it is my understanding that the VERY low
> > > power "power down" mode would not be useful for my application,
> since
> > > the peripherals (therefore the UARTs and SPI) are shut down in
> this
> > > mode. Any advise or hint on these subjects will be greately
> > > appreciated.
> > >
> > > Guille
> > >
> > >
> > >
> > >
> > >
> > >
> > > Yahoo! Groups Links
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> 
> 
> 
> 
> 
> 
> Yahoo! Groups Links