Can someone please offer a suggestion for a way to check if a value has changed up or down by at least some threshold. It doesn't matter how long it takes but code size and register use are important.
I'm not sure how to handle values lower than ChangeThreshold or higher then 255 - ChangeThreshold.
.equ ChangeThreshold = 6 .def OldValue = R16 .def NewValue = R17
Available registers R10, R11, R12, R13, R19, R24
CheckForChange: ; Determine if NewValue > OldValue + ChangeThreshold ; or NewValue < OldValue - ChangeThreshold rjmp HasChanged