This document is the I2C bus to read and write test procedures will JP6 jumper shorted, the use of an external 22.1184MHz crystal. Functions: the definition of 0 ~ 9 keys for the numeric keys, A ~ F for the function keys. A key press can be from 0 to 9 number keys, to start from zero address to store the keys, and send digital tube LED display of the keys. By the B button, to start from zero address to read data values, and send digital tube LED display. Once per second read speed. By the C key after the cessation of any operation.

Delay.h
I2C.H
key.h
main000.c
SPI.h

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