Diffstat (limited to 'Documentation/arm/empeg/ir.txt')
1 files changed, 49 insertions, 0 deletions
diff --git a/Documentation/arm/empeg/ir.txt b/Documentation/arm/empeg/ir.txt
new file mode 100644
@@ -0,0 +1,49 @@
+Infra-red driver documentation.
+Mike Crowe <firstname.lastname@example.org>
+(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.