To get into the interburst space i poll the clock line and start a time delay (about 1 ms)
from this point the first falling edge belongs to the first 12us cycle.
To recombine serial data my above int0 routine writes
zeroes or ones to bytes (inc R0). After that i assign
values writing to the bit area (from 20h up)
After that I mutiply by 127 and divide 1024 for [mm].

But now I fear that these LOW COST toys may have some
problems on their serial data output....as they are sold with the advice: interface not available.
Could it be second or third choice?

Edgar