Description: Serial driver itself into the MDD layer and the PDD layer. The MDD layer on top of the Device provides standard flow up COM_xxx Device driver interface (PDD layer), HWOBJ structure and the structure of the realization of serial number on the function pointer, hardware operate these function pointer pointing PDD layer to the serial operation function. DDSI refers to the MDD layer and the PDD layer in serial driver interface, actually refers to HWOBJ, PDD layer will be the MDD layer HWOBJ a pointer to the structure, so the MDD layer can be called PDD layer function to operate the serial interface.
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