Problem with ASM IRQ using FSR0 on PIC18F252

[Darrel Taylor]

Hi Jan,

Those variables aren't working the way you think. For instance:

TMR1ON VAR BIT
TMR1ON = T1CON.0

Creates a separate BIT variable, and then puts the value of T1CON.0 in it. It doesn't assign T1CON.0 the the name TMR1ON.

Try doing it this way.

TMR1ON VAR T1CON.0
TMR1IF Var PIR1.0
TMR1IE VAR PIE1.0
TMR1IP VAR IPR1.0
IPEN VAR RCON.7<br><br>

[jmen]

I´m realy a fool! I changed the wrong variable declaration to aliases as you suggested - now it´s working!!
thanks a lot, you´ve saved my life!!
Another short question...
When i have declared a variable as word - how do I assign a value like 1000 to it or better a value from anoter variable or constant?

In PBP I would do:
<pre>resetValue CON 1000
counter = resetValue</pre>
or:
<pre>resetValue VAR WORD
resetValue = 1000
counter = resetValue</pre>
In ASM: ??
<pre>MOVFF _resetValue, _counter</pre>
You see I´m a real beginner in ASM :-(

regards,
Jan

[Darrel Taylor]

Hey, don't worry about it Jan. I think I made the same mistake in the beginning.

To move 1 word var to another using movff might look like this ...

MOVFF _resetValue, _counter
MOVFF _resetValue+1, _counter+1

but that will only work with 2 variables. movff won't work with constants.

The easiest way to copy things from 1 place to another is using the MOVE?xx macro's. Take a look at this post for more info.

https://www.picbasic.co.uk/forum/showthread.php?p=2009

The MOVE?xx macro's will take care of all the bank switching (if required) the same way that PBP does it. <br><br>