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/**
* @defgroup sys_arduino Arduino
* @ingroup sys
* @brief Arduino in RIOT
*
* @section sec_about About
*
* This module enables users to run unmodified Arduino sketches in RIOT. For
* this we aim at supporting the full Arduino API.
*
* The support of the Arduino API in RIOT is useful for multiple reasons:
* - starting point for beginners
* - run your existing sketches on any non-Arduino hardware supported by RIOT
* - makes it easy to move from Arduino to RIOT
* - use Arduino device drivers in RIOT
* - is fun to implement :-)
*
* Refer to @ref sys_arduino_api for the actual API documentation
*
*
* @section sec_usage General usage
*
* To run your Arduino sketch in RIOT, just follow these steps:
*
* -# create an empty application
* -# add the `arduino` module to your application, your `Makefile` should now
* look something like this:
* @code
* APPLICATION = YOUR_APP_NAME
* BOARD ?= YOUR_TARGET_PLATFORM
* RIOTBASE ?= PATH_TO_RIOT_ROOT
*
* USEMODULE += arduino
*
* include $(RIOTBASE)/Makefile.include
* @endcode
*
* -# copy your Arduino sktech(es) into your application folder. Currently they
* must have the file ending `*.sketch` to be processed.
* -# build, flash, and run your application the usual RIOT-way: simply call
* `make all`, `make flash`, `make term`, etc.
*
* Thats all. As bonus you can of course use any existing RIOT code inside your
* Arduino sketches - you simply have to add the includes to your sketch and
* the corresponding modules to your `Makefile`.
*
* @note So far, all Arduino sketches MUST have the file ending `*.sketch` to
* be recognized by RIOT's build system
*
*
* @section sec_concept Concept
*
* For enabling RIOT to run Arduino sketches, we extended the build system to
* handle `*.sketch` files and we implemented the Arduino API using RIOT's
* native functions.
*
* @subsection sec_concept_build Extension of the build system
*
* Building Arduino sketches in RIOT is done in a two step process.
*
* First, the make system calls a dedicated
* [Arduino build script](https://github.com/RIOT-OS/RIOT/tree/master/dist/tools/arduino/pre_build.sh),
* which is called from the
* [Makefile.include](https://github.com/RIOT-OS/RIOT/tree/master/sys/arduino/Makefile.include)
* of the RIOT Arduino module.
*
* This script creates a temporary file called '_sketches.cpp' inside the
* application folder. Into this file, the script copies some Arduino glue code (
* [pre.snip](https://github.com/RIOT-OS/RIOT/blob/master/sys/arduino/pre.snip)
* and
* [post.snip](https://github.com/RIOT-OS/RIOT/blob/master/sys/arduino/post.snip))
* together with the contents of all `*.sketch` files contained in the
* application folder.
*
* Second, the RIOT make system is called as usual, processing the temporary
* file containing all the Arduino code. Simple :-)
*
* @subsection sec_conecpt_api Implementation of the Arduino API
*
* For supporting the Arduino API, we have created our own function and class
* definitions, using the exact same signatures as in the original Arduino
* header files. These headers are then implemented using standard RIOT APIs,
* e.g. the peripheral drivers, `xtimer`, etc.
*
*
* @section sec_boardsupport Add Arduino support to a board
*
* @note As prerequisite, the board must have support for C++.
*
* To add Arduino support to a board, it has to provide the following:
*
* In `RIOT/board/BOARD/include/arduino_board.h`:
* - a mapping of GPIO pins to Arduino pin numbers named `arduino_pinmap`, e.g.
* @code{c}
* static const gpio_t arduino_pinmap[] = {
* GPIO_PIN(PORT_D, 12),
* GPIO_PIN(PORT_D, 13),
* GPIO_PIN(PORT_D, 14),
* GPIO_PIN(PORT_D, 15),
* GPIO_PIN(PORT_A, 12),
* GPIO_PIN(PORT_A, 15),
* GPIO_PIN(PORT_B, 1),
* GPIO_PIN(PORT_B, 2),
* ...
* };
* @endcode
*
* - a define `ARDUINO_LED` that is mapped to an Arduino pin number connected to
* any on-board LED, or to pin 0 in case no LED is defined:
* @code{c}
* #define ARDUINO_LED (2)
* @endcode
* This links to the third entry in the `arduino_pinmap` array.
*
* In addition, you have to add the 'arduino' feature to the board. For this,
* just add `FEATURES_PROVIDED += arduino` to the 'other features' section in
* your board's `Makefile.features'.
*
* That's it, your board can now run Ardunio sketches.
*
*
* @section sec_todo Open issues
*
* @todo Make it possible to bootstrap Arduino code manually from any RIOT
* application. Include a pseudomule as e.g. arduino_base, which does not
* implement a main function calling `setup()` and `loop()`, so these
* functions have to be called manually from a RIOT application.
* @todo Implement analog outputs (PWM mapping)
* @todo Implement analog inputs (ADC mapping)
* @todo Implement SPI interface class
* @todo Add support for the 'Wire Library' (I2C)
* @todo Add means to include various Arduino Libraries (maybe as pkg?)
* @todo Implement anything else that is missing...
* @todo Adapt Arduino build script, so sketches do not have to have the file
* ending `*.sketch` anymore
*/