If you have less external interrupt pins on a processor, then how to interface multiple interrupts ?
C Thread Starter cshalini Joined Mar 21, 2013 2 Mar 25, 2013 #1 If you have less external interrupt pins on a processor, then how to interface multiple interrupts ?
ErnieM Joined Apr 24, 2011 8,377 Mar 25, 2013 #2 You OR them together to make 1 interrupt, then the ISR needs to poll each source to see which ones are triggered.
You OR them together to make 1 interrupt, then the ISR needs to poll each source to see which ones are triggered.
T tshuck Joined Oct 18, 2012 3,534 Mar 25, 2013 #3 To tack on to what Ernie said, you should poll them in order of priority, so higher priority interrupts are serviced first.
To tack on to what Ernie said, you should poll them in order of priority, so higher priority interrupts are serviced first.