The timing of 1 bit is fixed at 52-64µs.
If we poll the port with 44µs time loop, then a „1“ is represented by 2 or 3 times read positive _and_ negative part of bit.
Greater than 3 represent a zero (timing >90µs) and 0 or 1 is a frame error.
With full bit detection, we need to detect the polarity of the bit stream.