RC5 Protocol Decoding with 8051


Posted on Feb 5, 2014

Infrared light is electromagnetic radiation with longer wavelengths than those of visible light. Infrared light is used in industrial, scientific, and medical applications. Most of the remote controllers use IR light to send information. This protocol was developed by Phillips using Manchester Encoding. Information is sent in frames, where each fr


RC5 Protocol Decoding with 8051
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ame is consist of 14 bits. First two bits are start bits, the next bit is flip bit, which toggles every next frame if same command is sent. Next five bits are system address (remote specific) bits and last 6 bits are command bits, which actually stores command. Each bit is of 64 IR pulses. Every bit in an RC5 transmission has uniform duration, and contains one transition. `0` is encoded by a high to low transition, and a `1` by a low to high transition. There is a transition in the middle of the bit. So bit containing `0` value will be encoded as first 32 high pulses and next 32 low pulses, while `1` will be represented by first 32 low pulses and next 32 high pulses.




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