Hello,
I have a driver written for 2.4 + RT patches with FP support. I want it to work
in 2.6. How to implement FP? Has anybody developped some "protocol" between KS
and US yet? If not, could somebody point me, how to do it the best -- with low
latency.
The device doesn't generate irqs *), I need to quickly respond to timer call,
because interval between two posts of data to the device has to be equal as much
as possible (BTW is there any way how to gain up to 5000Hz).
I've one idea: have a thread with RT priority and wake the app in US waiting in
read of character device when timer ticks, post a struct with 2 floats and
operation and wait in write for the result. App computes, writes the result, we
are woken and can post it to the device. But I'm afraid it would be tooo slow.
*) I don't know how to persuade it (standard PLX chip with unknown piece of
logic behind) to generate, because official driver is closed and _very_
expensive. Old (2.4) driver was implemented with RT thread and timer, where FP
is implemented within RT and computed directly in KS.
So 2 questions are:
1) howto FP in kernel
2) howto precise timer (may mingo RT patches help?)
3) any way to have faster ticks (up to 5000Hz)?
Any suggestions, please?
thanks,
--
<a href="http://www.fi.muni.cz/~xslaby/";>Jiri Slaby</a>
faculty of informatics, masaryk university, brno, cz
e-mail: jirislaby gmail com, gpg pubkey fingerprint:
B674 9967 0407 CE62 ACC8 22A0 32CC 55C3 39D4 7A7E
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