[riot-devel] Working on port to SODAQ Autonomo (SAMD21)
kees at sodaq.com
Tue Jun 14 20:30:26 CEST 2016
On 13-06-16 22:39, Peter Kietzmann wrote:
> Hi Kees,
> honestly just now I got your actual problem and I remember what I
> stumbled upon this morning:
> # define the cpu used by SAMR21 Xplained Pro board
> export CPU = samd21
> export CPU_MODEL = samr21x18a
> However, I won't say "for RIOT that's good enough". To summarize: The
> main questions are (i) how to split different CPUs/MCUs with rather
> small differences and (ii) how to reuse most of the code. Right?
> For (ii) it would obviously be the best way to have drivers and stuff
> in the common folder. Personally I have no idea if this is possible or
> not, it depends on the differences. If these are too big, one needs to
> stay with a separate CPU folder for each "family".
Yes, that is certainly possible. All these SAM devices can be handled
with a common code base. Someone
already started such a common place: cpu/sam21_common. We should
continue with that.
If you ask me, I'd say that already a lot of files from
cpu/samd21/periph can be moved to cpu/sam21_common.
> For (i) won't it be enough to export the CPU_MODEL by the board and
> adjust the include paths properly, as done e.g. here?
Yes, that is the right thing to do. For Atmel there is one more thing:
CFLAGS must have a define like -D__SAMD21J18A__,
otherwise the correct include files aren't selected.
> One other question is the need for changing the CPU name of the Atmel
> samr21-xpro board from "samd21" to "samr21". In your regards I think
> it could make sense but with a solution as described in (i) above,
> there won't be a need for that. Do I see that correctly?
I don't care too much how the CPU is called. But maybe it is useful to
know which CPU variant
it is, like SAMD21J18A.
> Generally I'm not too much into Atmels product series and I would like
> to hear Kaspar's opinion as he knows RIOTs architecture much better
> than me.
I'd be interested to know what Kaspar thinks about it.
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