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Originally Posted by Mike Betts
Kevin, et al,
Use DIO3 and use both rising and falling edges as interrupts. Read Port B within the interrupt handler to determine which edge you are processing...
Mike
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This is exactly how the RC decoded the modulated IR signals from 2004. The code in receiver.c would be a great starting point. Receiver.c can be found in edu_tracker.zip and frc_tracker.zip located here:
http://kevin.org/frc/2004.
-Kevin