I'll add that I was getting interrupts before because I also had a=20
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 not
>> 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 one
>>> 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.  Is
>>>> your port bit set to an output?  Toggling the LAT reg?
>>>> Bill
>>>>
>>>>
>>>> Neil wrote:
>>>>
>>>>    =20
>>>>
>>>>> Would appreciate a fresh pair of eye here please, as I must be missin=
g
>>>>> 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, an=
d
>>>>> changing the prescale value seems to give odd results. This is a brie=
f
>>>>> section of what I have...
>>>>>
>>>>>       T4CON =3D 0b00000101;
>>>>>       PR4 =3D 50;
>>>>>       PIE5bits.TMR4IE =3D 1;
>>>>>       RCONbits.IPEN =3D 0;                // Disable interrupt priori=
ties
>>>>>       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 p=
eriod.
>>>>> I tried Timer-2 similarly and got the same results.
>>>>> Currently I've worked around the issue by using timer-1, but would li=
ke
>>>>> to know what's going on here.
>>>>>
>>>>> Anyone see what am I missing here?
>>>>>
>>>>> Cheers,
>>>>> -Neil.
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>      =20
>>>>>
>>>>    =20
>>>>

--=20
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