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TM4C129ENCPDT: Find which GPIO interrupt has occurred first?

Part Number: TM4C129ENCPDT

Hi, I have PA6 and PA7 of TM4C129 configured as interrupts. both interrupts would occur with a minute phase shift between them. I should detect which interrupt has occurred first and wait for the second interrupt to occur and set the flags accordingly. please guide how to proceed with this.

Thank you