mode2 data questions.

[Gregory M. <gr...@gx...>]

Still plugging away on sorting out transmitting codes with lirc using
the TIRA. I've managed to write code to generate an empty 'send' command
and now am working on actually filling out the data in said string so it
will work. Oh and I got the whole lot tied into lirc so I can do an
irsend <blah blah blah> and get some data to work with.

For instance using the command irsend SEND_ONCE 3100 power (using the
SAT_301 file found here:
http://lirc.sourceforge.net/remotes/echostar/SAT_301  )

I build the following, incomplete, command:

Header: 0x49 0x58 0x23 0x00  (I X {FREQ} {RESERVED} )
(Timing array)
BSA: |0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 |0x00 0x00 0x00 0x00 0x00
0x00 0x00 0x00 |0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00

IR Data:  400 6100  400 2800  400 2800  400 1700  400 2800  400 2800
400 1700  400 2800  400 2800  400 2800  400 2800  400 2800  400 2800
400 2800  400 2800  400 2800  400 2800  400 6200  400 6100  400 2800
400 2800  400 1700  400 2800  400 2800  400 1700  400 2800  400 2800
400 2800  400 2800  400 2800  400 2800  400 2800  400 2800  400 2800
400 2800  400 6200  400 6100  400 2800  400 2800  400 1700  400 2800
400 2800  400 1700  400 2800  400 2800  400 2800  400 2800  400 2800
400 2800  400 2800  400 2800  400 2800  400 2800  400 6200  400 6100
400 2800  400 2800  400 1700  400 2800  400 2800  400 1700  400 2800
400 2800  400 2800  400 2800  400 2800  400 2800  400 2800  400 2800
400 2800  400 2800  400 6200  400 6100  400 2800  400 2800  400 1700
400 2800  400 2800  400 1700  400 2800  400 2800  400 2800  400 2800
400 2800  400 2800  400 2800  400 2800  400 2800  400 2800  400   15 

Looking at the aforementioned lircd.conf chunk:
begin remote

  name 3100
  bits           16
  flags SPACE_ENC
  eps            30
  aeps          100

  header        400  6100
  one           400  1700
  zero          400  2800
  ptrail        400
  gap          6200
  min_repeat      4
  toggle_bit      0

  frequency    56000
[...]
end remote

We can see where the bits match up, Now I'm guessing that the fields:
header, one, zero, ptrail are all timing intervals of some sort? What
resolution are they (I'm looking for 8us resolution data and can convert
if I knew what I was looking at)?

I can see the data repeats 4 times (matches with the min_repeat bit).

It _looks_ like its <pulse length> <space length> for the other values?

I'm guessing the one and zero fields represent the pulse/space timing
for the one and zero bits respectively, again what resolution is this
in?

Does the ptrail and gap represent another interval? Before repeating the
code perhaps?

toggle_bit -- Whats this for?

Is any of this documented anywhere? I'm rummaged around some and can't
seem to find any documentation on the mystical lircd.conf data.

Thanks
  Greg