The procedures P5 port is common anode digital tube, all segments of the light-emitting tube cathode together then+5V P5 port to control the negative of each segment of the light-emitting tube. So, you want to let a certain period of the luminous tube lights up P5 port to send a logical " 0" period extinguished should be sent to the logic " 1" . Which library files under different experimental station.

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