the comand format is as follows:
this is the string I configured:
but the register for FineTuneFrequency(FTF) is signed 16-bit:
how should I write the register?? thanks!
Right off hand I would say the code you are showing should work fine. The difference between signed and unsigned is not importance -- they are both 16 bits so the command packet should build the same. Just make sure the bytes get inserted in the right order.