On Wednesday 04 April 2001 07:35, Kalyanaraman, Sivakumar (CTS) wrote:
> > Hi,
>
> sorry if i sound foolish, the question is as follows.
>
> how do i read the keyboard from a RT application ? I do not want to use a
> user-space thread that reads and sends me info thru a FIFO.
> since it is a PC, do I read the keyboard controller ports (60H-63H)
> directly ? will this work ??
It should, but you'd probably have to disengage the Linux keyboard ISR to get
it to work properly. (That is, don't share the IRQ with Linux, as the
standard driver would mess up you communication with the keyboard.)
> Or can the linux device drivers be used for this in any way ???
Well, yeah, bet it won't be more real time than the kernel driver. I'm not
sure how, or if it can be done without hacking the Linux driver, but it
should be possible to install some hook for RTL to use. Beware of the sync
issues, though; the kernel driver code probably can't run safely in RTL
context, so direct calls are out!
The easiest way would probably be to connect one (or two, if you need to talk
to the keyboard as well) RTL FIFOs to some hack in the driver to interface
with your RTL threads. Not sure about the blocking and waking up stuff here,
but it shouldn't be a problem; the RTL APIs you need are available AFAIK.
//David
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