Hi,
I think you need only a standard kernel driver that mmaps the memory
area of your pci board.
Thus, from user space program , you mmap it and can do whatever you want
in userspace world
Best Regards
steph
M. Koehrer wrote:
Hi everybody,
the RTDM API is really very good as API for drivers.
I have a real time (Xenomai) application in user space that has to access PCI boards.
The "classical" approach is now to use a kernel driver and to use RTDM as
interface
between the user space application an the kernel space driver.
However, for performance issues, I prefer to write a pure user mode driver.
As the memory of the PCI board can be accesses from user space (using /dev/mem)
I want to write a pure user space driver as this seems to me more efficient (and easier to debug) than
a kernel driver.
Also, only one application is accessing the driver at a time, I can link the
driver directly to my application.
My questions are now:
1. Is it possible to use the RTDM API also for pure user space drivers?
2. Is there any experience concerning the performance of a user space driver
versus a kernel space
driver?
In my use case, I have to write and read about 60 byte (each direction) of
(block) data to/from the PCI I/O system.
Thanks for any ideas or hints on that!
Regards
Mathias
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