Winterrupts.c writes but never reads .configured

[fpistm]

From @rogerclarkmelbourne on November 20, 2016 21:11

In various lines Winterrupts.c e.g.

https://github.com/stm32duino/Arduino_Core_STM32L4/blob/master/cores/arduino/WInterrupts.c#L43

.configured is written but never read.

These lines can be removed and

PinDescription g_intPinConfigured[MAX_DIGITAL_IOS];

can be changed to a array of pointers to PinDescription

(and the code changed accordingly)

Copied from original issue: fpistm/Arduino_Core_STM32L4#4

[fpistm]

From @fprwi6labs on January 10, 2017 10:26

g_intPinConfigured can be changed to a pointer.

I think the parameter "configured" is not well used in the entire code. I don't know if this parameter is really useful. For the moment we keep it.

[fpistm]

From @rogerclarkmelbourne on January 10, 2017 21:43

We have made a lot of changes to the F1 which probably include changes to this.

The complicated pin mapping function have been simplified etc

Ideally the code for the different MCU series would not differ too much, and perhaps the L4 code should be updated to be more like the revised F1 code.