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TMS320F280049: Unexpected GPIO firing on F280049 during EMC test

Sheldon He
Expert 8585 points
Part Number: TMS320F280049

Merry Christmas experts,

Customer found unexpected GPIO26 toggling on 100pin F280049 during EMC test, even without any change on GPIO26's "data", "clear", "set" or "toggle" register.

They have inserted some code to check GPADAT.bit.GPIO26 and this bit is changed even without intended change. Finally, they found "GpioDataRegs.GPADAT.bit.GPIO25 = 0" in ISR caused this problem, after they changed to "GpioDataRegs.GPACLEAR.bit.GPIO25 = 1", GPIO26 will not have any problem any more.

Could help me with any explanations or suggestions?

Thanks

Sheldon