Linux with RTAI: how would this work?

Hi,

Let's say I'm developing a control system for a UAV and I've decided to use
Linux with RTAI in the vehicle. I have a real-time task which does the
actual actuation of the flight surfaces and it controls the hardware
(motors) through GPIO pins. The RT task is talking to Linux through a fifo
(which Linux processes see as a block device) and Linux has a device driver
for a wireless radio data transceiver to talk to the base station.

The problem I see is that data being fed to the RT task is non-deterministic
since the data comes from Linux. This implies that to get proper hard Real
Time response one would have to write a RT device driver for the wireless
data transceier as well. In other words, the use of Linux wouldn't really
help very much. Even in a factory setting where the UI updates are being
handled by Linux there would still need to be a RT Ethernet driver to talk
to other factory floor devices for the same reason as illustrated above.

So is RT Linux actually a good choice?

JR



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