Instant Interrupts - Revisited

[Ioannis]

Hi. I am getting an error Symbol not previously defined (PIR2) on a 16F628 with Darrels interrupts.

On the program I do not use any PIR2 register. So why does this error come up? Can't this be taken care automatically?

Also if I want to disable TMR0 interrupts inside the timer0 INT Handler, will the Interrupts be enabled on exiting the routine? Like this:

INT_Service_TMR0:
@ INT_DISABLE TMR0_INT
    tmr0=21                 'Preload for 60msec time out
    timer0=1                'timer 0 has timed out flag
@ INT_RETURN    <<<<<<<<----------------Here I do not want to enable timer0

Thanks,
Ioannis

[Darrel Taylor]

Michael,

With the Port Change Interrupts ...
The PORT (GPIO) has to be read within the handler to end the mismatch condition. Otherwise it can't clear the interrupt flag and as soon as it exits the ISR it'll jump right back into another interrupt, essentially halting the main program.

You'll also receive interrupts on both the Rising and Falling edges, so you'll need to check the state of the PIN to know if it's been pressed or released.

And since you have to read the PORT to know which state the PIN is in, that qualifies as the port READ, and ends the mismatch.

RBPortIntPBP:
    if GPIO.3 = 0 then  TOGGLE GPIO.2
    pause 10
@ INT_RETURN

[Darrel Taylor]

Hi. I am getting an error Symbol not previously defined (PIR2) on a 16F628 with Darrels interrupts.

Ioannis,

I've compiled your program here for a 16F628 with several versions of PBP, and I don't get that error.

<strike>Have you made any changes to the DT_INTS-14 file?</strike>

Added:
Oh shoot, now I remember.
That was fixed in version 0.93 (Jan '06)

Try downloading the lastest version.
http://www.darreltaylor.com/DT_INTS-14/downloads.htm
<br>

[Ioannis]

Hi Darrel.

Yes I commended the wsave3 as I compile for 16F628 chip.

Also to get rid of the error I commended out the PIR2 references too.

I attach the modified file to check.

Thanks,
Ioannis

[Darrel Taylor]

Sorry, I added to my previous post.
Didn't get it in there soon enough.

It should help.
<br>

[Ioannis]

Thanks Darrel. Besides the wsave3 thing I had to commend out, yes it helped.

Now is fine.

About the disable interrupt, will the timer be enabled upon @ INT_RETURN ?

Ioannis

[Darrel Taylor]

Also if I want to disable TMR0 interrupts inside the timer0 INT Handler, will the Interrupts be enabled on exiting the routine? Like this:

INT_Service_TMR0:
@ INT_DISABLE TMR0_INT
    tmr0=21                 'Preload for 60msec time out
    timer0=1                'timer 0 has timed out flag
@ INT_RETURN    <<<<<<<<----------------Here I do not want to enable timer0

No it will not be re-enabled automatically.

And you won't get any more interrupts from the timer untill there's an @ INT_ENABLE TMR0_INT somewhere else in the program.

The Timer will continue to run and overflow, so the next time you Enable the timer ints ... make sure you clear the flag first or it will immediately jump into an unwanted INT.
@ INT_CLEAR TMR0_INT
<br>

[Ioannis]

OK. Better is to use Tmr1 but not available at the moment.

Thank you very much.
Ioannis

[bcd]

Hey Darrel,
Have you had a chance to try any of the new enhanced core pics yet ?

I have a few 16f1936 chips on order and would love to know if you have had a chance to play with DT_INT on them yet.

bill

[Darrel Taylor]

I have a few 16f1936 chips on order and would love to know if you have had a chance to play with DT_INT on them yet.

Did you order them in the QFN package?
Apparently the SOIC's won't be available from Microchip till November

I think the only thing you can get in a DIP package so far is the 1934, but they're usually out of stock on those.

I have some on order too, have no idea when I'll get them.

Consequently, DT_INTS will not work with the "E" (F1) chips.
<br>

[Michael Wakileh]

Thanks! ...Hadn't noticed because the main routine wasn't doing anything, and the other Led still seamed to toggle at 1 Hz...