Full-Duplex and Transparent Transmission Scheme of SPI Bus

To take full advantage of the communication capability of SPI Bus, and maximize the transmission capacity of SPI bus, a transparent transmission scheme for full-duplex communication is designed. Firstly, a hierarchical architecture for communication nodes is designed, which contains two modules: top processing module and underlying communication module. The modules run in parallel mode and a data buffering mechanism is established between them for data exchange; Secondly, based on the hierarchical architecture, a full-duplex transparent data transmission mechanism for independent transmission and reception is designed. The top processing module performs independent receiving and sending operations, while the underlying communication modules use data transparency for data transmission. Both two-way communication can use valid data and can be performed simultaneously. By improving the software algorithm, make full use of the full-duplex communication capability of SPI bus, realize bidirectional and simultaneous data transmission, and greatly improving the data transmission efficiency of the SPI bus.