media/rc/rc-protos.rst

9 IR is encoded as a series of pulses and spaces, using a protocol. These
10 protocols can encode e.g. an address (which device should respond) and a
12 across different devices for a given protocol.
14 Therefore out the output of the IR decoder is a scancode; a single u32
17 Other things can be encoded too. Some IR protocols encode a toggle bit; this
22 Some remotes have a pointer-type device which can used to control the
32 This IR protocol uses manchester encoding to encode 14 bits. There is a
55      - 6 (inverted)
57      - 2nd start bit in rc5,  re-used as 6th command bit
71    * - 6
77 There is a variant of rc5 called either rc5x or extended rc5
78 where there the second stop bit is the 6th command bit, but inverted.
80 schemes. This bit is stored in bit 6 of the scancode, inverted. This is
115    * - 6
117      - 6 to 11
121    * - 6
130 This rc-5 extended to encoded 20 bits. The is a 3555 microseconds space
166    * - 6
172    * - 6
185 The scancode is a 16 bits value, where the address is the lower 8 bits
191 The sony protocol is a pulse-width encoding. There are three variants,
211      - 0 to 6
218 The sony protocol is a pulse-width encoding. There are three variants,
238      - 0 to 6
245 The sony protocol is a pulse-width encoding. There are three variants,
282 As a check, the nec protocol sends the address and command twice; the
285 A plain nec IR message has 16 bits; the high 8 bits are the address
291 Extended nec has a 16 bit address and a 8 bit command. This is encoded
292 as a 24 bit value as you would expect, with the lower 8 bits the command
305 The scancode has a somewhat unusual encoding.
351 rc-6-0 (RC_PROTO_RC6_0)
354 This is the rc-6 in mode 0. rc-6 is described here
356 The scancode is the exact 16 bits as in the protocol. There is also a
359 rc-6-6a-20 (RC_PROTO_RC6_6A_20)
362 This is the rc-6 in mode 6a, 20 bits. rc-6 is described here
365 as in the protocol. There is also a toggle bit.
367 rc-6-6a-24 (RC_PROTO_RC6_6A_24)
370 This is the rc-6 in mode 6a, 24 bits. rc-6 is described here
373 as in the protocol. There is also a toggle bit.
375 rc-6-6a-32 (RC_PROTO_RC6_6A_32)
378 This is the rc-6 in mode 6a, 32 bits. rc-6 is described here
385 rc-6-mce (RC_PROTO_RC6_MCE)
388 This is the rc-6 in mode 6a, 32 bits. The upper 16 bits are the vendor,
397 This is a protocol used by Sharp VCRs, is described here
398 https://www.sbprojects.net/knowledge/ir/sharp.php. There is a very long
402 There is a 5 bit address and a 8 bit command. In the scancode the address is
415 This is not an IR protocol, this is a protocol over CEC. The CEC
454 device decodes the protocol. There is a BPF decoder available in v4l-utils.