This module provides no more than the correct configuration parameters
for the `w5100` driver using the Arduino I/O mapping features. But
by doing so, it will work out of the box with every mechanically and
electrically compatible board for which the Arduino I/O mapping
features are implemented.
- most were trivial
- missing group close or open
- extra space
- no doxygen comment
- name commad might open an implicit group
this hould also be implicit cosed but does not happen somtimes
- crazy: internal declared groups have to be closed internal
