Simple Timer question

[jimseng]

Hello everyone
I failed miserably to get my head round HSERIN/HSEROUT yesterday so I am trying a new approach. I really need some background timer running so that I can set a time out a bit like this:

Main:

if portb.0 = 1 then gosub dostuff 'a pin gets waggled

'if 3 minutes is up then do something here

goto main


gosub dostuff

'reset the timer back to 0

return

Basically under normal circumstances pins will be going high and low and each time they do I want to set the timer back to zero, it is only if there is inactivity that I want to flag it, but do it in the background while the main code is executing. I have been trying to find a simple timer example that applies to me but can't quite understand what I need.

Thanks

[Darrel Taylor]

INCLUDE "Elapsed.bas (http://www.picbasic.co.uk/forum/showthread.php?t=190)"

Gosub ResetTime ' Reset Time to 0d-00:00:00.00
Gosub StartTimer ' Start the Elapsed Timer

Main:
if portb.0 = 1 then gosub dostuff 'a pin gets waggled

IF MinutesChanged THEN
MinutesChanged = 0
IF Minutes = 3 THEN
'if 3 minutes is up then do something here

Gosub ResetTime ' Reset Time to 0d-00:00:00.00
ENDIF
ENDIF
goto main


dostuff:
; waggle as desired

Gosub ResetTime ' Reset Time to 0d-00:00:00.00
return