Doyle, Alan wrote:
>
> Hi,
>
> I have an application where I need to read four contiguous memory mapped
> data registers in response to an interrupt. As its real time critical I
> intend to implement the read in Xenomai. Having read and processed the
> data it later needs to be passed to a Linux domain application, I am
> hoping to use a Posix message queue for this purpose.
>
> I seem to have two options as to how to implement this, I could register
> the interrupt in a Xenomai user space thread and mmap the data registers
> so that on receiving the interrupt the registers could be read.
> Alternatively I could write a Xenomai RTDM driver to read the registers
> on interrupt and use the driver read call from the Xenomai user space
> thread to access register data. In each case the data would then be
> passed to the Linux domain via a message to a Posix queue - after some
> further processing that is not real time critical.
>
> Could you enlighten me as to the pros and cons of each approach,
The advantage of the "all in user-space" approach is that you will be
able to get rapidly something that works, because debugging in
user-space is much easier than in kernel-space. On the other
hand, writing a driver using RTDM will result in a clear separation
between application code and driver code that will be easier to maintain
on the long run. Imagine what will happen in the two cases when the
hardware changes.
--
Gilles Chanteperdrix.
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