无线通信芯片nRF903与89C51的接口设计

Design of the Interface Between 89C51 and Wireless Communication IC nRF903

介绍了无线通信芯片nRF90 3的主要特点和工作原理 ,在此基础上设计了nRF90 3与单片机 89C5 1的硬件接口电路。单片机 89C5 1可以通过其I/O控制nRF90 3的工作状态、工作频率和发射功率等参数 ,并能实现半双工无线通信。为了保证可靠通信 ,设计了一个简单的通信协议 ,该通信协议数据帧由包头、地址、数据和校验码 4部分组成 ,采用固定帧长度。文中给出了无线通信的接收和发射软件流程。所设计的软硬件接口非常适合在ISM频段的无线通信系统中应用。

This paper first introduces the features and operation principle of wireless communication IC nRF903, then designs a hardware interface circuit between 89C51 and nRF903. The MCU 89C51 can control the nRF’s operating parameters including operation status, operating frequency and transmitted power. The designed circuit can realize half-duplex wireless communicaiton. A simple communication protocol to guarantee reliable communication is also designed. The communication data package has stable length, which includes preamble, address, data and checksum. This paper also presents the software flow chart for sending and receiving data. The design is very suitable for wireless communication systems which work in ISM frequency band.