Method for receiving infrared remote control signal through serial port

Abstract

The invention discloses a method for realizing software decoding remote control of signal pulse by receiving infrared remote control signal via a serial port, which is intended to reduce the additional external intermission resource of system occupied by software decoding. The invention is mainly characterized in that: connect an OUT pin of an infrared remote control receiver to a RXD pin of the serial port; calculate the serial port baud rate according to the pulse width of the remote controller currently in use; configure tribute of the serial port, comprising the serial port baud rate; acquire the serial port data that complies the lead code of the remote controller currently in use and a user identification code; save the value of the serial port data and a corresponding serial port status register; convert the serial port data into remote control key press value according to a remote controller key press map for the corresponding relation between the value of the remote control key press, the serial port and the serial port status register. Therefore, the invention does not occupy the additional external intermission resource of system and lowers down the possibility of mistake under great load of other intermission.

Description

technical field [0001] The invention relates to infrared remote control technology, in particular to a method for receiving infrared remote control signals with a serial port. Background technique [0002] Infrared remote control technology is relatively mature at present, and has the advantages of convenient use, low power consumption, strong anti-interference ability and low cost. It has been widely used in home appliances and has also been valued in intelligent instrument systems. A general infrared remote control system is composed of three parts: an infrared remote control signal transmitter, an infrared remote control signal receiver, a microcontroller and its peripheral circuits. The remote coded pulse is generated by the remote coder, and the infrared transmitting tube is driven to output the infrared remote control signal. The remote control receiving head completes the amplification, detection and shaping of the remote signal, and demodulates the remote coded pulse...

AI Technical Summary

Problems solved by technology

For hardware decoding, the burden on the system is small, and the error probability is small, but the cost is relatively high; the cost of software decoding is low, but it increases the system burden. Conventional software decoding occupies the external interrupt resources and internal timer resources of the system, especially The probability of error is higher when other interrupt tasks in the system are heavy

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