One-Wire搜索算法,当单总线器件上挂载多个芯片时的搜索算法-One-Wire search algorithm, when a single device on the bus at the time of mounting multiple chips search algorithm

DS2781电量计程序，共同学习一起进步。(DS2781 electric meter program, learn together, progress together.)

wire libraryWire协议总线通信中最为重要的一种操作，在每次总线通信之前主机必须首先发送复位信号。如程序1.1所示，产生复位信号时主机首先将总线拉低480~960μs然后释放，由于上拉电阻的存在，此时总线变为高电平。(Wire protocol, the operation of the most important of a kind of bus communication, the host before each bus communication must first se