Hi Neil,

I am not 100% sure if your issue is resolved.

Just curious so I can stop or keep looking.

Cheers
Justin



On 20 August 2015 at 09:19, Neil <picdude3@narwani.org> wrote:

> I'll add that I was getting interrupts before because I also had a
> timer-0 interrupt running.
>
> Cheers,
> -Neil
>
>
> On 8/19/2015 9:03 PM, Neil wrote:
> > Got it.  Apparently PEIE *is* required when I'm not using interrupt
> > priorities (compatibility mode).
> >
> > Cheers,
> > -Neil.
> >
> >
> > On 8/19/2015 7:06 PM, Neil wrote:
> >> According to the datasheet, I don't need PEIE for timer 2.  I'm not
> >> setting it and I am still getting the port bit toggling... it's just n=
ot
> >> changing as I change PR4.
> >> Page 114 here...
> http://ww1.microchip.com/downloads/en/DeviceDoc/41412F.pdf
> >>
> >> I need to go investigate the priorities in detail again.
> >>
> >> Cheers,
> >> -Neil.
> >>
> >>
> >>
> >> On 8/19/2015 5:55 PM, William Bross wrote:
> >>> And shouldn't the PEIE bit in INTCON be set also?  Not sure of that o=
ne
> >>> without the datasheet in front of me.
> >>> BB
> >>>
> >>> William Bross wrote:
> >>>
> >>>> Hi Neil,
> >>>> I gave it a quick scan and it looks pretty straightforward to me.  I=
s
> >>>> your port bit set to an output?  Toggling the LAT reg?
> >>>> Bill
> >>>>
> >>>>
> >>>> Neil wrote:
> >>>>
> >>>>
> >>>>
> >>>>> Would appreciate a fresh pair of eye here please, as I must be
> missing
> >>>>> something very basic.
> >>>>>
> >>>>> I'm using Timer4 on a 18F24K22 to generate repeated pulses (C18
> v3.46),
> >>>>> but changing the PR4 match value does not seem to have any effect,
> and
> >>>>> changing the prescale value seems to give odd results. This is a
> brief
> >>>>> section of what I have...
> >>>>>
> >>>>>       T4CON =3D 0b00000101;
> >>>>>       PR4 =3D 50;
> >>>>>       PIE5bits.TMR4IE =3D 1;
> >>>>>       RCONbits.IPEN =3D 0;                // Disable interrupt
> priorities
> >>>>>       INTCONbits.GIE =3D 1;
> >>>>>
> >>>>> The interrupt service routine...
> >>>>>       if (PIR5bits.TMR4IF)
> >>>>>       {
> >>>>>           ... < Toggle PORT bit here for logic analyzer > ...
> >>>>>           ... other code here ...
> >>>>>           PIR5bits.TMR4IF =3D 0;
> >>>>>       }    // Timer-1 interrupt
> >>>>>
> >>>>> With this, I get regular pulses on the logic analyzer.
> >>>>> Changing PR4 has no effect on the timing.
> >>>>> Now, if I change T4CON to 0b00001101, nothing changes.  0b00010101
> >>>>> also.  0b00110101 changes the timing though, to double the previous
> period.
> >>>>> I tried Timer-2 similarly and got the same results.
> >>>>> Currently I've worked around the issue by using timer-1, but would
> like
> >>>>> to know what's going on here.
> >>>>>
> >>>>> Anyone see what am I missing here?
> >>>>>
> >>>>> Cheers,
> >>>>> -Neil.
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>
> >>>>
>
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