A realization of a serial extension of the realization of the four serial procedures, the use of the main chip 51, the expansion of the four sub-serial, sub-serial chip VK32, 51 and sub SPI communication between the serial port. All code in the product authentication through.

source code
...........\def.h
...........\main.c
...........\spi.c
...........\spi.h
...........\vk32.c
...........\vk32.h

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