Re: [PATCH 0/9 v2] IR: few fixes, additions and ENE driver

[Maxim Levitsky <maximlevitsky@gmail.com>]

On Thu, 2010-07-29 at 21:35 +0200, Christoph Bartelmus wrote: 
> Hi!
> 
> Maxim Levitsky "maximlevitsky@gmail.com" wrote:
> [...]
> >>>>> Could you explain exactly how timeout reports work?
> [...]
> >>> So, timeout report is just another sample, with a mark attached, that
> >>> this is last sample? right?
> >>
> >> No, a timeout report is just an additional hint for the decoder that a
> >> specific amount of time has passed since the last pulse _now_.
> >>
> >> [...]
> >>> In that case, lets do that this way:
> >>>
> >>> As soon as timeout is reached, I just send lirc the timeout report.
> >>> Then next keypress will start with pulse.
> >>
> >> When timeout reports are enabled the sequence must be:
> >> <pulse> <timeout> <space> <pulse>
> >> where <timeout> is optional.
> >>
> >> lircd will not work when you leave out the space. It must know the exact
> >> time between the pulses. Some hardware generates timeout reports that are
> >> too short to distinguish between spaces that are so short that the next
> >> sequence can be interpreted as a repeat or longer spaces which indicate
> >> that this is a new key press.
> 
> > Let me give an example to see if I got that right.
> >
> >
> > Suppose we have this sequence of reports from the driver:
> >
> > 500 (pulse)
> > 200000 (timeout)
> > 100000000 (space)
> > 500 (pulse)
> >
> >
> > Is that correct that time between first and second pulse is
> > '100200000' ?
> 
> No, it's 100000000. The timeout is optional and just a hint to the decoder  
> how much time has passed already since the last pulse. It does not change  
> the meaning of the next space.

its like a carrier report then I guess.
Its clear to me now.

So, I really don't need to send/support timeout reports because hw
doesn't support that.

I can however support timeout (LIRC_SET_REC_TIMEOUT) and and use it to
adjust threshold upon which I stop the hardware, and remember current
time.
I can put that in generic function for ene like hardware
(hw that sends small packs of samples very often)


Best regards,
Maxim Levitsky