Making Rtems Device Drivers using C?

[Joel Sherrill <joel@OARcorp.com>]

Alex wrote:
> Hi,
> I would like to implement a simple device driver to answer printer port requests, but in the rtems documentation I only see referencies to develop rtems drivers using ada... I want to implement it using c, any how-to? any tutorial? any help?


You must be missing something.  All drivers are implemented in C and you
should avoid using Ada (or C++ for that matter) for them due to 
potential run-time actions you might not anticipate.  Both Ada and C++ 
have complex run-times that can use mutexes, block, or allocate
memory at times you might not like.

For an LPT driver, I would think a simple serial device driver
would be a sufficient model to copy.  If it isn't interrupt driven,
then you can probably get away with using the "polled single port"
console driver shell used by psim.

> Thank you
> 
> Alex
> 
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Joel Sherrill, Ph.D.             Director of Research & Development
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