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Diffstat (limited to 'Documentation/arm/empeg/ir.txt')
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diff --git a/Documentation/arm/empeg/ir.txt b/Documentation/arm/empeg/ir.txt new file mode 100644 index 000000000000..10a297450164 --- /dev/null +++ b/Documentation/arm/empeg/ir.txt @@ -0,0 +1,49 @@ +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 |