GCBASIC documentation
Infrared Remote Control

Syntax:

    RC5Send address, data

    RC5High
    RC5Low

Command Availability:

Available on all microcontrollers. Requires the inclusion of the following:

    #include <remote.h>

Explanation:

RC5Send transmits a complete RC5-protocol infrared remote-control frame: two AGC (automatic gain control) bits, a toggle bit, 5 address bits, and 6 command bits. RC5High and RC5Low are the lower-level biphase (Manchester-style) half-bit routines RC5Send uses to transmit each bit — most programs only need to call RC5Send.

This command shares its output pin with NECSend (see NEC Remote Control), set with:

    #define RC5Out <pin>

The toggle bit is tracked automatically in the global variable RC5Toggle, which increments by one on every call to RC5Send — this is the standard RC5 mechanism a receiver uses to distinguish a genuinely new button press from a held-down repeat.

address uses the low 5 bits of the value passed, and data uses the low 6 bits, matching RC5’s 5-bit address / 6-bit command frame.

Example:

    #chip 16F877A, 20

    #define RC5Out PORTB.0
    Dir RC5Out Out

    Do
        RC5Send 0x04, 0x0A          ' <<< the RC5Send instruction
        Wait 100 ms
    Loop

Key line: RC5Send 0x04, 0x0A — transmits address 0x04 and command 0x0A as a complete RC5 frame, automatically incrementing RC5Toggle so a receiver can tell this transmission apart from a repeat of the previous one.

See Also: