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EK-TM4C123GXL: Connecting one EK-TM4C123GX board GPIO Output Pin to another EK-TM4C123GX GPIO Input Pin to read for interrupt

sherwin fun
Prodigy 240 points
Part Number: EK-TM4C123GXL

Hi,

I will like ask a question more towards GPIO/Hardware while using the TI EK-TM4C123GX Launchpad board. I am wondering if it's possible to have a EK-TM4C123GX (Board A) with a GPIO pin set to output with a high voltage level setting in code composer and then link this pin to another TI TM4 Launchpad EK-TM4C123GX (Board B) set with a GPIO Input pin to read a interrupt based on a "high voltage" trigger. Do i need to short both TI board gnd together? Wondering if the above works hoping if someone can point to me, how does a TI Launchpad EK-TM4C123GX GPIO port reads the voltage level if both boards are supplied from different power source? 

Regards

Sherwin