[Gambas-user] Did anybody try to run stepper motors through paralel port

[Benoît Minisini]

> I have VB6 program that run CNC plasma machine. It work very well and
> smooth under win200, but in WinXP machine motion is not good.
> 
> It doesnot help if I set REALTIME prority for the process ...
> 
> How about Linux and Gambas? Daes it depent on version of Linux ...
> 
> What is resolution for Gambas Timer? Can I wait 10 microsec do something
> wait 10 microsec and so on ...
> 
> Regards
> 

If you use timers, then the interpreter maintains a list of all timers, and 
knows how long it should wait before the next timer must be raised.

If the interpreter must wait more than 10 ms, then he sleeps inside the 
select() system call.

If he must wait less than 10 ms, then he enters a busy loop that takes 100% 
CPU before doing the select() system call once with a timeout of zero.

Otherwise, if you don't use timers, you can use:

- The WAIT instruction. This instruction runs an event loop, so you have the 
same behaviour as above.

- The SLEEP instruction, which uses the nanosleep() system call. At the 
moment, SLEEP does not do busy loops for very small delays. This may change in 
the future, in Gambas 3.

Regards,

-- 
Benoît Minisini