Device driver plays an important role in the linux kernel
which is the cornerstone of Android OS. The system creates
a device node /dev/rfsend and registers timer1 in linux
kernel. The timer1 is used to generate 50s as the base level
width for the encoding of the wireless module. By this
method, the needed 150s, 450s pulse width can be
obtained just by interrupting 3 and 9 times. In addition,
Timer input clock Frequency (Freq) and Regular time are
calculated as follows