Re: RFC: spibus: Return status of MISO line with transfer with xlen == 0;

Uwe Bonnes <bon-1JbLm1bU5j5ZIx36JBfelj3+ndqKAYMe9FMPySWZwLkb1SvskN2V4Q@public.gmane.org> Fri, 9 Sep 2016 10:48:45 +0200

Newsgroups	gmane.comp.hardware.microcontrollers.ethernut
Message-ID	<[email protected]>

>>>>> "Ole" == Ole Reinhardt <ole.reinhardt-L1vi/[email protected]> writes:

What about making the return value of
(*bus->bus_transfer) (node, NULL, NULL, 0)
0 : Function not implemented
1 : MISO reads one
-1: Miso reads zero.

0 is also the return value in all other cases.

That way an application could check for unimplemented functionality.

Bye
-- 
Uwe Bonnes                bon-1JbLm1bU5j5ZIx36JBfelj3+ndqKAYMe9FMPySWZwLkb1SvskN2V4Q@public.gmane.org

Institut fuer Kernphysik  Schlossgartenstrasse 9  64289 Darmstadt
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