说明：  W77E58双串口通信源代码 注：此源程序只作参考，内有些函数未有原型，借鉴在于其通信方式及其设置。 CRC检校可另参考其它代码。
(W77E58 dual serial communication source code Note : This program is for reference only, not some function prototype experiences in his means of communication and set up. CRC calibration can be a reference to other codes.)