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clearing RBIF flag - input_b optimizes away

 
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john bougs



Joined: 11 Feb 2005
Posts: 6

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clearing RBIF flag - input_b optimizes away
PostPosted: Fri Jan 14, 2011 8:59 am     Reply with quote
I have the following routine. When complied the input_b(); it optimizes away. Without it the RBIF flag is not cleared. I would prefer not to turn optimization off for the whole project. Any suggestions on a simple clean way to prevent it from optimizing away?

Right now I am just assigning it to a global. but I am already low on ram. I suppose I could code a section in assembly, but I am looking for a cleaner way of doing it.






Code:

    //----------------------------------------------------------------------------
    // First stage of keypad routine - key press has been detected, start timer
    // to call keypad scanning (debouce key).
    //----------------------------------------------------------------------------
    #INT_RB
    void keypadIsr (void)
    {
        disable_interrupts(INT_RB);
        input_b();
        keypadTimerStart();
    }
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Fri Jan 14, 2011 9:13 am     Reply with quote
Read this thread:
http://www.ccsinfo.com/forum/viewtopic.php?t=30095
john bougs



Joined: 11 Feb 2005
Posts: 6

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PostPosted: Fri Jan 14, 2011 2:05 pm     Reply with quote
Thanks, I did not find that reference. I am already using that as a alternative but was hoping there was a more elegant solution.
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