1 Infra-red driver documentation.
3 Mike Crowe <mac@empeg.com>
8 The Kenwood KCA-R6A remote control generates a sequence like the following:
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)
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)
19 Rather than repeat a signal when the button is held down certain buttons
20 generate the following code to indicate repetition.
24 Go low for less than 2T
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
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.
34 All codes are of the form b9xx
36 The numeric keys generate the code 0x where x is the number pressed.