The content of the program is to control KEY2, KEY4 two buttons as interrupt INT0 and INT1 under certain experimental conditions, the light-emitting diode right loop, the loop is terminated, and change to recycling and other functions. Specifically to run the program, eight light-emitting diodes from left to right by-lighted, and continue to cycle. If the press KEY4 starting the INT1 emitting diode cycle stops, and in the digital tube 2 by digital reality this position where the light emitting diode, and restored when the light emitting diode and then press KEY2 cycle. Library functions according to the bench.

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