Key control device and key control method

A key control method for a key control device, the key control device comprising:

• a first interface extension circuit, a main control circuit and an encoder circuit, and the encoder circuit comprising a first output terminal and a second output terminal and configured to output a first voltage signal and a second voltage signal through the first output terminal and the second output terminal under triggering of a rotation operation;
• wherein
• the key control method comprises:
• receiving, by the first interface extension circuit, the first voltage signal and the second voltage signal, and generating, by the first interface extension circuit, an interrupt signal and voltage state transition data in response to the first voltage signal or the second voltage signal output by the encoder circuit, and
• determining, by the main control circuit, a rotation direction of the rotation operation according to the interrupt signal and the voltage state transition data,
• wherein the first interface extension circuit comprises a first status register, and
• generating, by the first interface extension circuit, the voltage state transition data, comprises:
• generating and storing, by the first status register, the voltage state transition data for the first output terminal and the second output terminal of the encoder circuit based on the first voltage signal and/or the second voltage signal,
• determining, by the main control circuit, the rotation direction of the rotation operation according to the interrupt signal and the voltage state transition data comprises:
• reading out, by the main control circuit, the voltage state transition data stored in the first status register in response to the interrupt signal output from the first interface extension circuit, and determining the rotation direction of the rotation operation based on at least the voltage state transition data stored in the first status register,
• the first status register comprises a first sub-register and a second sub-register, and
• generating and storing, by the first status register, the voltage state transition data for the first output terminal and the second output terminal of the encoder circuit based on the first voltage signal and/or the second voltage signal, comprises:
• generating and storing, by the first sub-register, the voltage state transition data for the first output terminal of the encoder circuit according to the first voltage signal output by the first output terminal, and generating and storing, by the second sub-register, the voltage state transition data for the second output terminal of the encoder circuit according to the second voltage signal output by the second output terminal, and
• the first interface extension circuit outputs a first type of interrupt signal when a transition of a voltage state occurs at the first output terminal;
• and the first interface extension circuit outputs a second type of interrupt signal when a transition of a voltage state occurs at the second output terminal.