Subject:
Re: Re: Re: Re: Re: [gnupic] PIC18 Rtos
From:
"vinod kanna r" ####@####.####
Date:
23 Jun 2005 05:43:32 +0100
Message-Id: <20050623044500.9221.qmail@webmail18.rediffmail.com>
Hi,
Thanks for the info. I gonna start with this now, will update you when it gets going. Â
Vinod
On Wed, 22 Jun 2005 xavier.montagne wrote :
>Hello,
>
>It's correct ! Slow interrupts need to save the context of the current task. Fast interrupts have a very short latency time (see C18 user guides) but you need to wirte something really simple to be sure to use only STATUS, WREG et BSR registers...
>
>The latency time of PICos18 is given for the fastest speed of the PIC18 : 40MHz... I mean 10 MIPS.
>
>For your inofrmation I will release this week PHOENIX that is the port of PICos18 for classic processor architectures like dsPIC (PIC30), ARM7 & ARM9 (with no cache, no mmu and no fpu) and TMS320 (further development).
>PHOENIX has exactly the same API than PICos18 so you can rebuild you application for any processor ported.
>
>Hope this will be helpfull for people who are looking for a free RTOS for their personnal or professionnal projects.
>Xavier
> ----- Original Message -----
> From: vinod kanna r
> To: xavier.montagne
> Cc: ####@####.####
> Sent: Wednesday, June 22, 2005 7:34 AM
> Subject: Re: Re: Re: Re: [gnupic] PIC18 Rtos
>
>
> Ok, i get that.
>
> Just began to scoll through the tuto.pdf. The latency time for picos18 is listed as 50us. Just want to know what controller speed does this number correspond to (is it 1MIP or 10MIPS etc)?
>
> What I get to understand so far is, the latency on low priority interrupts is 50us max, and that on high priority is immediate (as latency specified by microchip PIC datasheet) as there no PICOS overhead on high priority interrupts. Please correct me if I'm mistaken.
>
> Thanks
> Vinod
>
> On Tue, 21 Jun 2005 xavier.montagne wrote :
> >Yes, I'm the original author of PICos18 ;-)
> >Xavier
> > ----- Original Message -----
> > From: vinod kanna r
> > To: xavier.montagne
> > Cc: ####@####.####
> > Sent: Tuesday, June 21, 2005 6:10 AM
> > Subject: Re: Re: Re: [gnupic] PIC18 Rtos
> >
> >
> > Xavier,
> > Could not correlate when you said "I GONNA", but then I realised you were one of the moderators of picos18. Thanks for considering my case.
> > Vinod
> >
> >
> > On Mon, 20 Jun 2005 xavier.montagne wrote :
> > >I know... sorry for that !
> > >I don't have enough time to translate it... :-(
> > >Anyway I gonna try to strart the translation this week.
> > >Xavier
> > >
> > >
> > >----- Original Message -----
> > > From: "vinod kanna r" ####@####.####
> > >To: "gnupic" ####@####.####
> > >Sent: Monday, June 20, 2005 5:55 AM
> > >Subject: Re: Re: [gnupic] PIC18 Rtos
> > >
> > >
> > >Thanks for the suggestion, axully I did take a glance at it, an API.pdf
> > >document(referring to the same used by picos18) is missing in english, but
> > >the french version is available. I'm still looking for the english version.
> > >
> > >
> > >
> > >On Sat, 18 Jun 2005 xavier.montagne wrote :
> > > >Have a lookt at PICos18 too : www.picos18.com
> > > >
> > > >Xavier
> > > >
> > > >----- Original Message -----
> > > > From: "Alex Holden" ####@####.####
> > > >To: "vinod kanna r" ####@####.####
> > > >Cc: ####@####.####
> > > >Sent: Friday, June 17, 2005 10:23 AM
> > > >Subject: Re: [gnupic] PIC18 Rtos
> > > >
> > > >
> > > > > On 17 Jun 2005, at 05:44, vinod kanna r wrote:
> > > > > > All the while I have been using (and am used to) writing the
> > > > > > firmware and the application barebones directly on to the
> > > > > > controller without the use on any RTOS, but this time I'm
> > > > > > contemplating on the equestrian approach using one.
> > > > >
> > > > > The equestrian approach?
> > > > >
> > > > > > Please recommend an open source(if available) or anything for that
> > > > > > matter. Would appreciate if a prescription follows.
> > > > >
> > > > > Prescription?
> > > > >
> > > > > You could take a look at FreeRTOS- they have a PIC18 port. http://
> > > > > www.freertos.org/
> > > > >
> > > > > > Btw, just want to know, can such deadlines be met by an RTOS at all ?
> > > > >
> > > > > Yes.
> > > > >
> > > > > --
> > > > > ------------ Alex Holden - http://www.alexholden.net/ ------------
> > > > > If it doesn't work, you're not hitting it with a big enough hammer
> > > > >
> > > > >
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