Thanks for the explanations! It's clear for me now.
UDD seems to be exactly what I would like, so if you find some examples
please tell me.
Jean-Marc
Le 17/04/2018 à 18:38, Greg Gallagher a écrit :
This API is the API for the cobalt kernel and used in kernel
space. These functions aren't available in user space. Your user
program is failing to build because the data structures exist in the
kernel and not in user space.
You can create an RTDM driver to handle the IRQs from the PCI
board and then a user space program to read data from the driver.
Usually you can't have the Linux driver and the xenomai driver loaded
at the same time, for drivers like RTnet, serial and SPI I have to
unload the Linux driver or else the Xenomai probe function won't be
called because the Linux driver has registered itself for the
hardware. I guess there could be exceptions to that rule.
If you want examples for RTDM drivers look in the drivers
directory. You can also look at using UDD driver to control the
device from user space. When I get time I'll look through the code
base and see if I can point you to some examples. In the meantime the
UDD source files contain some documentation about how the functions
work if you want to get some more information.
-Greg
On Tue, Apr 17, 2018 at 10:59 AM, Jean-Marc Lenoir
<jean-marc.len...@univ-grenoble-alpes.fr> wrote:
Hello,
I would like to make a program which handle the interrupt requests of a PCI
board with Xenomai 3. I'm trying to use this Xenomai API:
https://xenomai.org/documentation/xenomai-3/html/xeno3prm/group__cobalt__core__irq.html
but there are some points that are not clear at all for me.
1) There is already a Linux driver that handle the IRQ of this board and I
need to keep this driver running because I use it for the board
configuration. So, if both a Linux driver and a Xenomai program try to
handle the same IRQ, what happen? Does Xenomai always have the priority? Or
do I need to configure something to give the priority to Xenomai?
2) This API works on kernel mode or user mode? (Actually, I'm not sure there
is a kernel mode, I'm a beginner with Xenomai.)
3) When I'm trying to make a simple program with this API (in user mode), I
am unable to compile it: there is some missing definitions like the
structure xnintr. I think I need to change something when I build the
Xenomai libraries but I don't know what (the current libraries are compiled
with the options "./configure --with-core=cobalt --enable-smp
--enable-pshared"). Any idea?
4) If someone know where I can find an example of program using this API, it
could help me a lot.
Thanks for your help,
Jean-Marc
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