is it possible to break PAUSE statement with multiple interrupts?

[CuriousOne]

Hello, here is my code:



lcdout $FE,1,"Duration:",#xangrdzlivoba, " us "
LCDOUT $FE, $C0,"Delay:", #dakovneba, " ms "
triala:
IF PIRVELI=0 THEN GOSUB DROMINUS
IF MEORE=0 THEN GOSUB DROPLUS
IF MESAME=0 THEN GOSUB PAUSAMINUS
IF MEOTXE=0 THEN GOSUB PAUSAPLUS
IF PIRVELI=1 AND MEORE=1 AND MESAME=1 AND MEOTXE=1 THEN GOSUB CAVIDA
GOTO TRIALA
DROPLUS:
XANGRDZLIVOBA=XANGRDZLIVOBA+10
if xangrdzlivoba>10000 then xangrdzlivoba=10000
lcdout $FE,2,"Duration:",#xangrdzlivoba, " us "
LCDOUT $FE, $C0,"Delay:", #dakovneba, " ms "
PAUSE 50
return
DROMINUS:
XANGRDZLIVOBA=XANGRDZLIVOBA-10
if xangrdzlivoba<10 then xangrdzlivoba=10
lcdout $FE,2,"Duration:",#xangrdzlivoba, " us "
LCDOUT $FE, $C0,"Delay:", #dakovneba, " ms "
PAUSE 50
RETURN

PAUSAPLUS:
DAKOVNEBA=DAKOVNEBA+10
if DAKOVNEBA>10000 then DAKOVNEBA=10000
lcdout $FE,2,"Duration:",#xangrdzlivoba, " us "
LCDOUT $FE, $C0,"Delay:", #dakovneba, " ms "
PAUSE 50
RETURN
PAUSAMINUS:
DAKOVNEBA=DAKOVNEBA-10
if DAKOVNEBA<20 then DAKOVNEBA=20
lcdout $FE,2,"Duration:",#xangrdzlivoba, " us "
LCDOUT $FE, $C0,"Delay:", #dakovneba, " ms "
PAUSE 50
RETURN
CAVIDA:
HIGH ANTEBA
PAUSEUS XANGRDZLIVOBA
LOW ANTEBA
PAUSE DAKOVNEBA 'this causes delay
RETURN
END



It do controls stroboscope, so user presses buttons and sets strobe duration and delay between pulses. The problem is, that when delay is quite long, and code is executing apropriate PAUSE statement, buttons are not operable. So is it possible to add some code, that will end PAUSE statement prematurely, on any key press?

I've tried to make a loop instead of pause, and check state of all buttons inside it, but since the delay can be quite short, such additional statements slow it down considerably. I'm using PIC16F870 @ 4mhz.

[technotronix]

Yes, I think it is possible to set a break point using 'pause' command with multiple interrupts.

[HenrikOlsson]

Without going into tricks like manipulating the system variables used for the PAUSE statement there's no way to terminate a PAUSE statement prematurely. If you're using interrupts (not ON INTERRUPT though) the program can be made to respond DURING the PAUSE statement but then any time spent handling those events will of course be "added" to the duration of the pause.

The best way is probably to break the pause duration up in a a lot of shorter durations and check your inputs and what not as part of that loop. I read your response as if that's something you've tried but it's not clear why it didn't work for you. To keep accurate timin you must try Writing the "check-inputs-code" so that it always takes the same amount of time. Then of course I have no idea exactly how acurate you NEED to be.

If the polling code take 120us to execute then do a loop with PAUSEUS 876 (tweak it match) and GOSUB your polling code each time.

/Henrik.

[CuriousOne]

Yes, what I basically want, is to terminate PAUSE statement, when any key is pressed.

[HenrikOlsson]

And like I said, you basically can't without going to low level tricks. Instead my recommendation would be something like this:

Delay_ms = 1000
GOSUB WaitHere

WaitHere:
For ms = 1 to Delay_ms
Gosub CheckInputs
PAUSEUS 900 ' Tweak this to get correct timing, value depends on execution time CheckInputs.
NEXT

RETURN

CheckInputs:
' Do whatever here, but no pausing etc
' If the delay should be terminated set ms = Delay_ms which will then terminate the FOR-NEXT loop when it returns.
RETURN

/Henrik.

[CuriousOne]

Oh, thanks, will give it a try.