If we accept friend Kel's read/verify of your code - might one of those Port_B pins be "cross-connected" to other GPIO - that board? (if true - dispatch of 0-ohm smt R suggested...)
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If we accept friend Kel's read/verify of your code - might one of those Port_B pins be "cross-connected" to other GPIO - that board? (if true - dispatch of 0-ohm smt R suggested...)