On Fri, Apr 04, 2008 at 03:57:53AM -0400, Mauricio A. Araya L�pez wrote: > Hi all, > > I've been searching on the web (and in the rt-wiki) for the current > status of the real-time support for devices. For instance > the serial port, CAN Bus, etc. > > I am doing some experiments to check if RT_PREEMPT could be an option to > a control system that is using RTAI nowadays. > > If not, maybe it is a good thing to develop myself, so if anyone can > comment anything about this, it will be very helpfull to start. I was just doing this and fell into a tangent looking at USB2Serial issues with RT applications. FWIW I was able to get +/- 30usec jitter from a serial port experiment where I programmed a PIC to push 5 bytes over the serial line every 20ms. I had a blocking read from a FIFO pthread that would wake up and call gettimeofday, which I used to measure the jitter. It was very impressive. I'm pretty confident that *if* you use a hardware serial port (no-USB) you will be able to implement effective PID controls with a real time pthread program running on a RT-preempt kernel. um on common desktop PC hardware like what I used anyway. --mgross -- To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
