50 lines
1.2 KiB
Text
50 lines
1.2 KiB
Text
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Infra-red driver documentation.
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Mike Crowe <mac@empeg.com>
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(C) Empeg Ltd 1999
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Not a lot here yet :-)
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The Kenwood KCA-R6A remote control generates a sequence like the following:
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Go low for approx 16T (Around 9000us)
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Go high for approx 8T (Around 4000us)
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Go low for less than 2T (Around 750us)
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For each of the 32 bits
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Go high for more than 2T (Around 1500us) == 1
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Go high for less than T (Around 400us) == 0
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Go low for less than 2T (Around 750us)
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Rather than repeat a signal when the button is held down certain buttons
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generate the following code to indicate repetition.
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Go low for approx 16T
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Go high for approx 4T
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Go low for less than 2T
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(By removing the <2T from the start of the sequence and placing at the end
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it can be considered a stop bit but I found it easier to deal with it at
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the start).
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The 32 bits are encoded as XxYy where x and y are the actual data values
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while X and Y are the logical inverses of the associated data values. Using
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LSB first yields sensible codes for the numbers.
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All codes are of the form b9xx
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The numeric keys generate the code 0x where x is the number pressed.
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Tuner 1c
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Tape 1d
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CD 1e
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CD-MD-CH 1f
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Track- 0a
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Track+ 0b
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Rewind 0c
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FF 0d
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DNPP 5e
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Play/Pause 0e
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Vol+ 14
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Vol- 15
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