Re: [Xenomai-help] SPI and I2C

[Jan Kiszka <jan.kiszka@domain.hid>]

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Dirk Eibach wrote:
> Hello,
> 
> has anybody already thought about RTDM drivers for SPI and I2C? Is there
> any development for a generic solution in progress?

I haven't heard of any activity or thoughts yet (at least I do not
recall them right now).

While reading some related SPI patch on LKML, I once thought about this
issue for a (short) while. I didn't grabbed immediately how the
execution model of the vanilla SPI framework precisely looks like, but
it seemed to involve quite some queueing and IRQ handling. And this
smelled like reusing code or even just the design may not be
straightforward.

Did you already have a look at the related Linux frameworks? I think the
first step should be to collect requirements of a generic
real-time-capable SPI and I2C infrastructure and compare them with the
existing stack designs. Maybe one can at least reuse the API to make
driver migration as smooth as possible.

Jan


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