Have u experienced this problem too? I decided to rest the matter since nobody else could reproduce the problem or find the bug in my code (if any).
lp2000c <lp2000c@...> wrote:
Did you ever resolve this issue, or confirm that there is a bug?
--- In lpc2000@yahoogroups.com, "Leighton Rowe" <leightonsrowe@y...>
wrote:
>
> Yep,
>
> PLLSTAT says that the PLL's enabled, connected & locked.
>
> I'm running the code on a mcb2100 as well (12MHz crystal). I made a
> mistake about the processor on the mcb2100 though...it's actually a
> 2124 that replaced the original 2129 (it got toasted :-/).
> My other board is the 2114 with a 14.7456MHz xtal.
>
> So, I'd imagine the code will work ok on all 2129's, as you've
> shown. There might be an issue with 2114/24's I'm using. I'm trying
> to verify that with Philips...or anyone here that has them.
>
> best regards,
> Leighton
>
> --- In lpc2000@yahoogroups.com, "Pete" <peterbrown_abroad@y...>
> wrote:
> >
> >
> > Hi Leighton,
> >
> > Im using the MCB2100 development board from Keil for the time
> being.
> > Our main control unit is in development as we speak...
> >
> > anyway, the MCB is stuffed with the LPC2129, crystal of 12Mhz.
> >
> > I have tested my system using YOUR CODE that you pasted below,
and
> I
> > agree with my previous answers...the clock WORKS OK at all VPBDiv
> > settings....
> >
> > i print the time to terminal (38400baud) and monitor the time for
> > several minutes and it certainly does not run fast (or fast
enough
> > to visually see anyway!)...
> >
> > so i am very confused why you see this problem....
> >
> > so i guess i cannot help any further.... but hope the above helps
> a
> > little....
> >
> > daft question - are u sure that your PLL is enabled and running?
> >
> > let me know if you find the solution,
> > rgds
> > pete
> >
> >
> >
> > --- In lpc2000@yahoogroups.com, "Leighton Rowe"
> <leightonsrowe@y...>
> > wrote:
> > >
> > > Thanks for your results
> > >
> > > What lpc are you using by the way? Is your RTC counting at the
> > right
> > > speed when VPBDIV=0? Try comparing the RTC timers against a
> normal
> > > clock if u can.
> > >
> > > I tried your code on my 12 MHz board (M=5), and this is what I
> get.
> > > VPBDIV = 0 so VPB = 15MHz (cclk/4)
> > > PREINT = 0x000001c8;
> > > PREFRAC = 0x000061c0;
> > > RTC runs OK, but it's going twice as fast.
> > > ....
> > > VPBDIV = 1 then VPB = 60MHz (cclk)
> > > PREINT = 0x00000726;
> > > PREFRAC = 0x00000700;
> > > RTC runs OK. Speed is normal.
> > > ....
> > > VPBDIV = 2 then VPB = 30MHz (cclk/2)
> > > PREINT = 0x00000392;
> > > PREFRAC = 0x00004380;
> > > RTC runs OK. Speed is normal.
> > >
> > > For now, It's still unsolved over here.
> > >
> > > Thanks,
> > > Leighton
> > >
> > > I've included pieces of my code just for reference.
> > > ************************************
> > > #define XTAL_FREQ 12000000
> > > //#define XTAL_FREQ 14745600
> > > #define MULTIPLIER 5
> > > //#define MULTIPLIER 4
> > > #define CCLK (XTAL_FREQ * MULTIPLIER) // system
> > clock
> > > system clock (cclk)
> > > #define PCLK (CCLK / 2)
> > > //#define PCLK CCLK
> > > //#define PCLK (CCLK / 4)
> > >
> > > if(PCLK == CCLK)
> > > {
> > > VPBDIV = 1;
> > > }
> > > else if(PCLK == CCLK/2)
> > > {
> > > VPBDIV = 2;
> > > }
> > > else if(PCLK == CCLK/4)
> > > {
> > > VPBDIV = 0;
> > > }
> > >
> > > CCR = AMR = CIIR = ILR = 0; //clear all RTC Misc registers
> > > SEC = MIN = HOUR = 0; //clear timer registers being used
> > >
> > > //Setup Prescalar Values
> > > PREINT = (PCLK/32768) - 1; //integer value
> > > PREFRAC =PCLK - ((PREINT + 1)* 32768); //fraction value
> > >
> > > CCR |= 2; //reset timer
> > > CCR &= ~2;
> > > CCR |= 1; //start timer
> > >
> > >
> > >
> > >
> > > --- In lpc2000@yahoogroups.com, "Pete" <peterbrown_abroad@y...>
> > > wrote:
> > > >
> > > >
> > > > ok, got home and have tried on my dev board...
> > > > Using a 12Mhz crystal, I configured the VPBDiv=0
> > > >
> > > > As a result modified the Fac and Int settings to:
> > > > PREINT = 0x000001c8;//Set RTC prescaler for
> > > 12.000Mhz Xtal,
> > > > VBP=15Mhz
> > > > PREFRAC = 0x000061c0;
> > > >
> > > > using the calculations from databook.
> > > >
> > > > I also then had to change my UART settings to match, sicne
the
> > > PCLK
> > > > was now 1/4.....
> > > > Anyway: ALL WORKS OK. RTC functions normally.
> > > >
> > > > Can you check what values you used for the Prefac/int when
you
> > > > adjusted the VPBDiv?
> > > >
> > > > Or, since you have it working maybe issue is closed?
> > > >
> > > > anyway, thought i would report my findings!
> > > >
> > > > rgds
> > > > pete
> > > >
> > > >
> > > > So I am confused that you say you had problem with the
> > > >
> > > > --- In lpc2000@yahoogroups.com, "bty639886"
<peter.brown@b...>
> > > wrote:
> > > > >
> > > > > when i get home i will check this out on my systsem.
> > > > >
> > > > > I do however have a 12Mhz clock rather than the 14.xx that
u
> > are
> > > > > using. So my preints and facs will be different.
> > > > > Im suspecting the problem could well be with your prefac
> being
> > 0
> > > > > given the divider settings...
> > > > >
> > > > > anyway, i will check it out and re-post for future
reference.
> > > > >
> > > > > glad you got it working !
> > > > > rgds
> > > > > pete
> > > > >
> > > > >
> > > > > --- In lpc2000@yahoogroups.com, "Leighton Rowe"
> > > > <leightonsrowe@y...>
> > > > > wrote:
> > > > > >
> > > > > > > 3. have you tried running with vpbdiv set to 1 (ie
> > resulting
> > > > in
> > > > > > > 60mhz opertion (ish).. i am using that for my system
> > without
> > > > any
> > > > > > > problem...
> > > > > >
> > > > > > Good news!
> > > > > >
> > > > > > After setting VPBDIV = 1 (pclk =cclk) and setting PREINT
> and
> > > > > PREFRAC
> > > > > > (based on the user manual), the RTC counted correctly.
> > Thanks
> > > > > Pete.
> > > > > > The RTC also worked for VPBDIV = 2 (pclk = cclk/2).
> > > > > >
> > > > > > But interestingly, the RTC still counted twice as fast
> after
> > > > using
> > > > > > VPBDIV = 0. I repeated everything on 2 different lpcs
> > (lpc2114
> > > > > > @14.7456MHz & lpc2129 @12MHz). You can even try it out on
> > your
> > > > > own;
> > > > > > I wouldn't be surprised you'll get the same results. and
> got
> > > the
> > > > > > same results.
> > > > > >
> > > > > > So RTC's OK only when vpbdiv = 1 (pclk=cclk) or 2 (pclk =
> > > > cclk/2).
> > > > > > Otherwise RTC's doubles in speed when vpbdiv = 0
(cclk/4).
> I
> > > > hope
> > > > > > Philips has an explanation for this one...I have no clue
> > why.
> > > > > >
> > > > > > For now, I can live with using a different vpbdiv setting
> to
> > > > make
> > > > > > everything work.
> > > > > >
> > > > > > Thanks again
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[Non-text portions of this message have been removed]Message
Re: [lpc2000] Re: RTC manipulation (ctd.)
2004-12-24 by Leighton Rowe