Hi Jeff,

for such a task I would use a timer interrupt only.

And inside the interrupt I check, if the input has changed or not and a byte count the duration.

E.g. on using an interrupt every 100µsec for the times of 0.8 / 1.3 / 2.6msec you get values of 8 or 13 or 26, which can easy be tested.

E.g. a comparison if >20 and <30 will give you the start detection and then if <10 or >10 you can decide if low or high bit.

I can give you an example for the RC5 code which has no extra start bit length.



Peter