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PIC24EP interrupts question

 
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benoitstjean



Joined: 30 Oct 2007
Posts: 289
Location: Ottawa, Ontario, Canada

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PIC24EP interrupts question
PostPosted: Mon Dec 18, 2017 1:01 pm     Reply with quote

Compiler: 5.026
Device: PIC24EP512GP806

Quick question... as far as I know, I disable all interrupts before putting the PIC to sleep except for a few that will be used to wake-up the PIC.

Something else is waking-up the MCU because when it wakes-up, I check all interrupts using the following:
Code:

fprintf( MONITOR_SERIAL, "\n\rINT_RDA: %u -- UART", interrupt_active( INT_RDA ));
fprintf( MONITOR_SERIAL, "\n\rINT_EXT0: %u -- SD Card", interrupt_active( INT_EXT0 ));
fprintf( MONITOR_SERIAL, "\n\rINT_EXT1: %u -- Input 1", interrupt_active( INT_EXT1 ));
fprintf( MONITOR_SERIAL, "\n\rINT_EXT2: %u -- Input 2", interrupt_active( INT_EXT2 ));
fprintf( MONITOR_SERIAL, "\n\rINT_EXT3: %u -- Motion ON", interrupt_active( INT_EXT3 ));
fprintf( MONITOR_SERIAL, "\n\rINT_EXT4: %u -- Motion OFF", interrupt_active( INT_EXT4 ));

On some occasions, none of the above show as being active meaning that something else woke-up the MCU.

Should I be reading IFS0/IEC0 to IF8/IEC8 registers to show what triggered the interrupt? Not sure if I'm doing this right. They all seem to be returning some values that doesn't make sense.

Note here that I never really use direct MCU registers but rather CCS functions... so sorry for my ignorance.

Thanks!

Ben
Ttelmah



Joined: 11 Mar 2010
Posts: 12659

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PostPosted: Mon Dec 18, 2017 2:06 pm     Reply with quote

I'd just read the interrupt flag registers and display any that have changed.
Suspicion would be that there is a fault with your old compiler not accessing the correct bits.

If you check my reply to your earlier thread:
<http://www.ccsinfo.com/forum/viewtopic.php?t=56828>

Your compiler was accessing the wrong bit for interrupt on change. Odds are this is not the only fault.
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