 void uart_init()：uart初始化配置，配置相应IO口状态、奇偶校验选择以及波特率等参数。  unsigned char uart_max_data_get(unsigned char*buf) ：通过协议计算等获取串口通讯的最大数据长度，用于判断这一帧数据接收完全  unsigned char uart_recive(unsigned char*buf)：串口接收函数，接收到的数据存储在buf中。  unsigned char uart_send(unsigned char*buf,unsigned char len)：串口发送数据。传入参数为数据指针以及数据长度。

uart_print\init.c
..........\init.h
..........\output_info.c
..........\output_info.h
..........\readme.doc
uart_print

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