Documentation/arm/empeg/ir.txt

   1 Infra-red driver documentation.
   2
   3 Mike Crowe <mac@empeg.com>
   4 (C) Empeg Ltd 1999
   5
   6 Not a lot here yet :-)
   7
   8 The Kenwood KCA-R6A remote control generates a sequence like the following:
   9
  10 Go low for approx 16T (Around 9000us)
  11 Go high for approx 8T (Around 4000us)
  12 Go low for less than 2T (Around 750us)
  13
  14 For each of the 32 bits
  15   Go high for more than 2T (Around 1500us) == 1
  16   Go high for less than T (Around 400us) == 0
  17   Go low for less than 2T (Around 750us)
  18
  19 Rather than repeat a signal when the button is held down certain buttons
  20 generate the following code to indicate repetition.
  21
  22 Go low for approx 16T
  23 Go high for approx 4T
  24 Go low for less than 2T
  25
  26 (By removing the <2T from the start of the sequence and placing at the end
  27  it can be considered a stop bit but I found it easier to deal with it at
  28  the start).
  29
  30 The 32 bits are encoded as XxYy where x and y are the actual data values
  31 while X and Y are the logical inverses of the associated data values. Using
  32 LSB first yields sensible codes for the numbers.
  33
  34 All codes are of the form b9xx
  35
  36 The numeric keys generate the code 0x where x is the number pressed.
  37
  38 Tuner           1c
  39 Tape            1d
  40 CD              1e
  41 CD-MD-CH        1f
  42 Track-          0a
  43 Track+          0b
  44 Rewind          0c
  45 FF              0d
  46 DNPP            5e
  47 Play/Pause      0e
  48 Vol+            14
  49 Vol-            15