The CPU has multiple issues and several parts of the platform code
does not even compile cleanly for this CPU in the current state.
This removes support for parts MK60DN256ZVLL10, MK60DN512ZVLL10
(note the Z) CPUs with this part number were used in Mulle v0.60 which
only has been used in some in-house projects at Eistec and LTU.
This is a rewrite of the Kinetis GPIO driver which follows the
refactored API in [1]. Pins are specified using the GPIO_PIN(PORT_x, y)
macro, e.g. GPIO_PIN(PORT_E, 25) for the PTE25 pin.
The interrupt pin handling is now implemented as a linked list, this
is more memory efficient, but with a minor variation in interrupt
latency depending on in what order the pins were initialized at
runtime.
Because the linked list entries are taken from a shared pool, there is
also the possibility of running out of available configuration slots,
define the preprocessor macro GPIO_INT_POOL_SIZE in periph_conf.h if
you need more than 16 pins configured for interrupts in the same
application.
[1]: https://github.com/RIOT-OS/RIOT/pull/3095
