Re: [Xenomai-core] 2.4.32 compilation error + old timer example problem

[Hannes Mayer <h.mayer@domain.hid>]

Philippe Gerum wrote:
[...]
>> Just one question: what's the reason why the periodic mode
>> is disabled by default ?
>>
> 
> Because AFAICT, most people would rather use the aperiodic timing mode 
> in usual configurations for a much better accuracy. Since the periodic 
> mode uses the available hw PIT and programs it once (or even some 
> decrementer but without handling the time drift when reprogramming it 
> after each shot), it suffers from cumulated rounding errors of the 
> period. If you look at the jitter results of a trivial periodic loop 
> over a broad timescale, you will see the wakeup time irremediably drift, 
> whilst the average interval between shots remains stable and reasonably 
> accurate. The periodic timer should be used for configurations that only 
> need to enforce delays or timeouts, and not, well, precise timings.

Thanks Philippe!
If it's for accuracy, keep it that way!

Best regards,
Hannes.