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Infra-red driver documentation.

Mike Crowe 

(C) Empeg Ltd 1999

Not a lot here yet :-)

The Kenwood KCA-R6A remote control generates a sequence like the following:

Go low for approx 16T (Around 9000us)

Go high for approx 8T (Around 4000us)

Go low for less than 2T (Around 750us)

For each of the 32 bits

  Go high for more than 2T (Around 1500us) == 1

  Go high for less than T (Around 400us) == 0

  Go low for less than 2T (Around 750us)

Rather than repeat a signal when the button is held down certain buttons

generate the following code to indicate repetition.

Go low for approx 16T

Go high for approx 4T

Go low for less than 2T

(By removing the <2T from the start of the sequence and placing at the end

 it can be considered a stop bit but I found it easier to deal with it at

 the start).

The 32 bits are encoded as XxYy where x and y are the actual data values

while X and Y are the logical inverses of the associated data values. Using

LSB first yields sensible codes for the numbers.

All codes are of the form b9xx

The numeric keys generate the code 0x where x is the number pressed.

Tuner           1c

Tape            1d

CD              1e

CD-MD-CH        1f

Track-          0a

Track+          0b

Rewind          0c

FF              0d

DNPP            5e

Play/Pause      0e

Vol+            14

Vol-            15