[En-Nut-Discussion] Cortex ih_xxx_interuptY code duplication, continued

[Ole Reinhardt]

Hi Harald,

> In the first place I'd recommend to keep the API compatible. It is
> quite frustrating for non regular Nut/OS users to find their
> applications not compiling after upgrading Nut/OS. Or, to put it the
> other way: It was quite enjoyable to see my I2C apps compiling and
> running fine, even after Ulrich significantly changed the I2C API. That
> was good work! (Side note: It would have been even better without the
> typo in "Tranceiver".)
> 
> On the other hand, if you don't see a chance to keep downward
> compatibility:
> 
> 1) Not many applications will not use their own interrupt registration.
> Instead they will use existing drivers.

Some smaller changes to the API will be needed. Especially the ISR
routine won't be a void function any longer but will have a return
value. I think most other changes will be hided in the structs.

> 2) Change it now. Moving from Nut/OS major version 4 to 5 implies, that
> major things changed. After 5.x is out, such changes are less
> acceptable.

Yes, I will try to implement a prototype ASAP, but this might take three
more days, as I'm out of office again for two days.

Before I'll check in anything I will send a patch to the list for review
and commenting.

Bye,

Ole

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