说明：  ATMEL mega128，模数转换器驱动程序。将.c和.h文件添加进工程。使用时先初始化，然后调用读函数指定通道和参考点压 ，单片机采样完成后返回采样值。
(ATMEL mega128, AD converter driver. Will. C and. H file added to the project. When using initialized first, then read function called specified channel and reference point pressure, single chip microcomputer sampling after the completion of the return samples values.)