[riot-notifications] [RIOT] drivers/gpio: changed periph driver interface (#3095)

Hauke Petersen notifications at github.com
Sun Jun 14 16:18:59 CEST 2015

The xbee driver had trouble, as it was using the `GPIO_NUMOF` define as value for undefined GPIO pins. Now that not every platform does have this define anymore, the test failed to build. I introduced a new `GPIO_UNDEF` define, which makes it possible on all platforms to specify unused GPIO pins. This approach should be very much cleaner and straight forward.

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