里面有三个文件，一个介绍了NRF51822各寄存器的详细资料，一个介绍了各外设的功能，一个介绍了S110协议栈的功能-There are three files, one describes the details NRF51822 each register, a descr iption of the various peripheral functions, an introduction to the functions of the protocol stack S110