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

LDLP
....\LDLP.c
....\LDLP.h

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