主要面对 以SPI SCI I2C RS232 RS485 为物理层的低速接口提供一个数据链路层。可以在MCU和PC之间传递数据，也可以在MCU之间传递数据，该数据链路层带CRC校验，带自动出错重传，带确认帧，带超时报警，总之是一个非常好用的数据链路层协议-The main face of SPI SCI I2C RS232 RS485 interfaces for the physical layer to provide a low-speed data link layer. You can pass data between the MCU and PC, you can pass data between the MCU, the data link layer with the CRC, with automatic error retransmission, with confirmation frame, with out warning, in short, is a very easy to use The data link layer protocol