You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
50 lines
1.2 KiB
50 lines
1.2 KiB
20 years ago
|
Infra-red driver documentation.
|
||
|
|
|
||
|
|
Mike Crowe <mac@empeg.com>
|
||
|
|
(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
|