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Update protocol.md (#436)

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Adjust documentation on transmit format

* Trailer is actually 0x00 0x0d 0x05 (ie the extended pulse length format)
* Trailer doesn't have to be this value on transmit

This is based on work in https://github.com/elupus/irgen, but is just a qualified guess that seem to match reality.
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Joakim Plate 2020-10-18 22:31:56 +02:00 committed by GitHub
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@ -181,11 +181,13 @@ Send the following payload with a command byte of 0x006a
|0x05|repeat count, (0 = no repeat, 1 send twice, .....)|
|0x06-0x07|Length of the following data in little endian|
|0x08 ....|Pulse lengths in 2^-15 s units (µs * 269 / 8192 works very well)|
|....|0x0d 0x05 at the end for IR only|
|....|For IR codes, the pulse lengths should be paired as ON, OFF|
Each value is represented by one byte. If the length exceeds one byte
then it is stored big endian with a leading 0.
Captures of IR codes from the device will always end with a constant OFF value of `0x00 0x0d 0x05` but the trailing silence can be anything on transmit. The likely reason for this value is a capped timeout value on detection. The value is about 102 milliseconds.
Example: The header for my Optoma projector is 8920 4450
8920 * 269 / 8192 = 0x124
4450 * 269 / 8192 = 0x92