说明：  Pakect数据包的设置，包括TX和RX缓冲区的长度、前导码的配置Preamble、同步字的配置SyncWord、Field对应负载的字节数据，注意总的负载字节数为TX和RX阈值，具体分几个fields看个人需求
(The setting of pakect packet includes the length of TX and Rx buffer, the configuration of preamble, the configuration of synchronous word, the byte data corresponding to the load of syncword and field. Note that the total number of load bytes is the threshold value of TX and Rx, and see the individual requirements in several fields)