On Die, 27 Jul 1999 Julien Verchere wrote:
> I use RT-Linux to command a video tape recorder. I send a
>command to this device, and i have to wait 5 to 10ms for an
>acknowledgement.
Is this really hard real-time ?
> At the beginning, i used an active wait (
>"while(rt_com_read(.....) < 0);" ) but it was waisting a lot of time.
> So, i add some functions to rt_com to set an handler function,
>only called when something is received by the serial port.
I am not exactly sure what you have done, but rt_com_isr _is_ called
whenever some data comes in (well, actually depending on the FIFO-size
you set).
> Now, my real time task, send a command to the video tape, make
>itself sleeping, and wait to be waking up by the special function called
>when somethings is written in the serial port.
>
> I would like to know if there is a more simple and more clean
>solution. Does someone developp a version of rt_com able to do that ?
For sure something like that could be incorporated into rt_com.
> Another question: what is the correct procedure to install the
>new rt_com module given yesterday by Jochen Kuepper ?
I just send out a new version, including a Makefile.am for incorporation
into a bigger project, and a Makefile.standalone that should basically be
used to do
make -f Makefile.standalone
make -f Makefile.standalone install
Then insmod the module.
-- Jochen
Heinrich-Heine-Universität Düsseldorf [EMAIL PROTECTED]
Institut für Physikalische Chemie I phone ++49-211-8113681
Universitätsstr. 26.43.02.29 fax ++49-211-8115195
40225 Düsseldorf, Germany www-public.rz.uni-duesseldorf.de/~jochen
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