Arduino Core for Arancino SAMD21 Boards

This core is a fork of the Arduino SAMD21 core modified to support the functionality of the Arancino architecture.

Supported Boards

Arancino
Arancino Mignon

Installation on Arduino IDE

This core is available as a package in the Arduino IDE cores manager. If you want to install it:

Open the Preferences of the Arduino IDE.
Add this URL https://raw.githubusercontent.com/smartmeio/arancino-boards/master/package_smartmeio_index.json in the Additional Boards Manager URLs field, and click OK.
Open the Boards Manager (menu Tools -> Board -> Board Manager...)
Install Arancino SAMD Boards
Select one of the boards under Arancino SAMD Boards in Tools -> Board menu

Installation on PlatformIO and Visual Studio Code

To create a project with Visual Studio Code and PlatformIO it is necessary to initially create a project for Arduino M0 and then modify the platformio.ini file in order to point to the Arancino packages. The platformio.ini file must be modififed in order to contains this configuration:

[env:arancinosamd]
platform = https://github.com/smartmeio/platform-atmelsam.git#8.1.0-arancino
board = arancino
framework = arduino
upload_protocol = sam-ba
platform_packages = smartme-io/framework-arduino-samd-arancino@https://github.com/smartmeio/arancino-core-samd21.git
lib_deps = https://github.com/smartmeio/arancino-library
  https://github.com/smartmeio/Arduino-FreeRTOS-SAMD21
upload_port = ...

Any other used library must be included as dependency through lib_deps (as for the Arancino library) or saved under the lib folder; in the latter case the project structure should look like:

include
lib
+-- your_library
     +-- examples
     +-- include
     +-- keywords.txt
     +-- library.json
     +-- src
src
+-- main.cpp
test

Alternatively, you can set an extra directory in which to search for libraries. For example, if you want to include all the libraries installed in the Arduino IDE, you can specify it adding this lines to the platformio.ini configuration file:

lib_extra_dirs = ~/Arduino/libraries

Uploading Sketches

Arduino IDE

Select the appropriate serial port shown in the Arduino Tools -> Port -> Serial Port menu once (this setting will stick and does not need to be touched for multiple uploads). This selection allows the auto-reset tool to identify the proper device to reset.

PlatformIO

Set the appropriate serial port into the platformio.ini file, e.g.:

upload_port = /dev/ttyACM1

Then hit the upload button and your sketch should upload and run.

In some cases the MCU will encounter a hard hang and its USB port will not respond to the auto-reset request. Should this happen, put the MCU in bootloader mode double-tapping the reset button and then retry the upload on the new serial port.

Debugging with OpenOCD and GDB

PlatformIO

To debug the code you need an external debugger (e.g. Atmel EDBG, Ateml ICE, etc).

This additional debugging information can be added to the platformio.ini file in order to improve the debugging process.

build_type = debug
lib_archive = no

Enabling FreeRTOS support

This core supports FreeRTOS: to include and enable it just include the Arancino.h library and, depending on the used IDE, enable it.

Arduino IDE

Through the menu Tools -> Using FreeRTOS -> Yes.

PlatformIO

Add an extra flag to the platformio.ini configuration file:

build_flags = -DUSEFREERTOS -DENABLE_CALLOC_REALLOC -Wl,--wrap=malloc -Wl,--wrap=free -Wl,--wrap=calloc -Wl,--wrap=realloc

Licensing and Credits

The Arduino SAMD21 core is developed and maintained by Arduino LLC in collaboration with Atmel.
The Arduino IDE and ArduinoCore-API are developed and maintained by the Arduino team. The IDE is licensed under GPL.
FreeRTOS is Copyright Amazon.com, Inc. or its affiliates, and distributed under the MIT license.

This core has been developed by Arduino LLC in collaboration with Atmel, and customized by smartme.IO s.r.l.

  Copyright (c) 2019 smartme.IO.  All right reserved.

  This library is free software; you can redistribute it and/or
  modify it under the terms of the GNU Lesser General Public
  License as published by the Free Software Foundation; either
  version 2.1 of the License, or (at your option) any later version.

  This library is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  See the GNU Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public
  License along with this library; if not, write to the Free Software
  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

Arduino and Atmel are trademarks of their respective owners.