Re: [Xenomai-help] Keyboard IRQ

[Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>]

Antoine Nourry wrote:
> Gilles Chanteperdrix a écrit :
>> Antoine Nourry wrote:
>>
>>   
>>> I neither understand, is there a way to measure precisely the absolute 
>>> time of a keypress event on our computers ?
>>>     
>> Well, you can wait for the event in a user-space program, and use Linux
>> plain gettimeofday. It will probably give you more than enough precision.
>>
>>   
> Ok, i already made such programs but i thought that my polling method to 
> detect key event was bad and may consume too much time.

Well, you have to set the terminal to raw mode, and wait for a one
character read to return, then call gettimeofday. But you will have to
check in books or other lists for the shortest way to wait for a
character, I will not pretend to know this.

> Moreover aren't there any risks of being preempted or slowed by other
tasks ?

Not if you give your task a real-time priority. Which you were going to
do by using xenomai anyway.

-- 
					    Gilles.