I found a serial bit bang program using direct port manipulation which won't compile - code attached below. It complains that PORTB is undeclared. I created a new sketch and included the softUart.h at the top. I also found a version of 'blink' using direct port manipulation which compiles just fine…

error 'PORTB' undeclared

Danois90 May 28, 2018, 11:36am 2

You are not using PORTB in your code?

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