An input device sends a 20ms positive signal to perform an action. The signal is captured using an interrupt triggered on the rising edge of the positive signal. It appears that there might be some electrical noise on the signal line. I suspect this because the interrupt is getting trigger inadvertently. I currently don’t have access to an oscilloscope to verify the signal integrity. I am using MSP430 microcontroller.
Question: What is the most effective/simple way for the micro-controller to capture the 20ms positive signal with out modifying electrical hardware?