multiple instances of built-in functions with PCD?

billpa · Joined: 30 Mar 2010 Posts: 3

Hi,

I need to do 32 bit integer multiplies and divides at both interrupt and task time with PCD. But, I can’t have global interrupts disabled at task time in the MULS3232 and DIVS3232A functions generated by the compiler.

Is it possible to tell the compiler to create another instance of these two functions? Or, anybody have 32 bit integer mul/div source available? Smile

Thanks!

Bill
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Bill

PCM programmer · Joined: 06 Sep 2003 Posts: 21708

billpa · Joined: 30 Mar 2010 Posts: 3

THANK YOU!!!
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Bill

Ttelmah · Joined: 11 Mar 2010 Posts: 19551

Seriously though, try to work out a way of avoiding the divides!....
Remember that /2,/4 etc., can be done using a shift. It is often possible to scale numbers 'up', using a multiply, and then use one of these. Difference in time is really major. Worth thinking very carefully if you can about this....

Best Wishes