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hallo
i would like to generate an long or ulong variable with v4.5 (i know that v5 is supporting this feature)

my problem is that i am using a timer for generating long delays between 1 minute and xxx minutes

cristal: 19,6608 Mhz
timer with interupt : prescaler 1:1 --> 75Hz
int variable: max. value 32768 -->causes max time from about 7 minutes

thanx for any help

Hi goingo,
You don't need a ulong variable to have long delays.


At the start of your Flowchart before main loop you can have:
seconds = 0
minutes = 0
hours = 0

With in your interrupt you can have:
count=count+1
If count =75 then count=0: seconds = seconds+1: If seconds = 60 then seconds=0:minutes = minutes + 1:if minutes = 60 then minutes = 0:hours = hours + 1
etc.
If you want to have a 46220 seconds delay for example.
In main you can have:
If (hours = 12) && (minutes =50) && (seconds = 20) then: output 1 to port A1 etc.

There are clock examples on the forums.
If you get stuck just yell and I can help you further.

Martin

wonderful it works perfect
many thanx to you medelec35 (where is the thanx button???)

goingo

Hi goingo,
Glad it works for you

Attached is another version that counts up to 8355584 using just 1 byte and 1 int.
The idea being int counts up to 32767, then byte = byte +1 :int = 0 etc.
If you want 8 million seconds and using a calculator:
8000000/32767 = required bytes (disregard any decimal numbers)
X 32767= Required Integer

Buttons to press on a calculator:
8000000/32767 =
-244 =
X 32767
=
For 8 million seconds:
Byte = 244
Int= 4852

Hope I have made this clear enough?

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Martin