[riot-notifications] [RIOT-OS/RIOT] sys/arduino: Added Wire (I2C) interface (#10592)

Gunar Schorcht notifications at github.com
Thu Sep 5 18:29:55 CEST 2019

@cladmin The situation was the following:

You have a directory with an Arduino application, for example `examples/hello-world-arduino`. The `Makefile` enables the `arduino` module
USEMODULE += arduino
In this case, the make system expects a file with extension `.sketch` from which the file `_sketch.cpp` is generated and compiled afterwards.

However, when you have an Arduino library, the directory usually contains only a `.h` and a `.cpp` file, for example:
The compilation of such a directory requires same compiler configuration as for an Arduino application using `sys/arduino` library.

So the idea was just to declare a pseudomodule `arduino_lib` in addition to the `arduino` psdeudomodule. The makefile would then enable
USEMODULE += arduino_lib
which enables module `arduino` implicitly. The make system wouldn't try to generate `_sketch.cpp` from a `.sketch` file.

Therefore I used the following construct in former `sys/arduino/Makefile.include`
- $(shell $(RIOTTOOLS)/arduino/pre_build.sh $(SRCDIR) $(APPDIR) $(SKETCHES))
+ # run the Arduino pre-build script if Arduino module is not used as library
+ ifeq (, $(filter arduino_lib, $(USEMODULE)))
+     $(shell $(RIOTTOOLS)/arduino/pre_build.sh $(SRCDIR) $(APPDIR) $(SKETCHES))
+ endif
and in `sys/Makefile.dep`
+ ifneq (, $(filter arduino_lib, $(USEMODULE)))
+     USEMODULE += arduino
+ endif  

It would be really cool if it would be possible to import Arduino libraries as packages and to compile them since there are thousands of drivers available for Arduino IDE.

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