Description: CNC water lights, choice of content keys, 16 keys are 0 ~ F, press a button on the motherboard LED sub display the corresponding value, and the way through the asynchronous serial communication sent from the key content machine. Asynchronous serial communication requirements: can not use the serial port chip built, except P3.0 and P3.1 require external IO pins to simulate any transmission, speed is 2400 baud.
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master.c
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