interrupts disabled during call @ADDFF

j@qmail.com · Joined: 12 Nov 2003 Posts: 4

I have searched and can not find an answer on point. I compile my program and get this message:

PCM programmer · Joined: 06 Sep 2003 Posts: 21708

It seems likely that you're doing an addition operation inside
an interrupt service routine. The code for this operation is
in a CCS "library" module. There is only one instance of it,
but you're using it in both main() and in the interrupt routine.
Therefore, CCS is disabling interrupts around the code in
main(), because their math library code is not re-entrant.
In other words, it can't be executed in main() and in the
interrupt routine at the same time.

See the comments by Ttelmah in this thread about warning messages:
http://www.ccsinfo.com/forum/viewtopic.php?t=41570

If you want to get rid of the warning, then read this thread
about using #org default:
http://www.ccsinfo.com/forum/viewtopic.php?t=33837
Another example:
http://www.ccsinfo.com/forum/viewtopic.php?t=25464&start=4

j@qmail.com · Joined: 12 Nov 2003 Posts: 4

All good,
Tnx,
Jay
Very Happy

vasiliok · Joined: 17 May 2011 Posts: 19 Location: Kaunas, Lithuania

I've got such an error when used "a = a+0.5" in the interrupt.
Probably using float variable in the interrupt is not a good idea Smile

CCS 5.081 version.

Ttelmah · Joined: 11 Mar 2010 Posts: 19510

Yes. The 'FF' here is float. So it is a floating point addition used both
inside and outside the interrupt.... Sad

vasiliok · Joined: 17 May 2011 Posts: 19 Location: Kaunas, Lithuania

temtronic · Posted: Wed Feb 23, 2022 1:16 pm

generally speaking....
ISRs are supposed to be short and fast

OK to do these
set a couple 8 bit values
set a few flags
set a register or two

but NOT these...
no floating point
no fancy math (SIN,COS, etc..)
no printing
no complicated decisions

probably a few other 'rules'.....
a 'cheat' is to use a faster clock speed...