Integrate Arduino.org boards

[facchinm]

Tian needs arduino/Arduino@e970968 to work correctly.
Avrdude needs to be added as a dependency in index json file

[ArduinoBot]

✅ Build completed.

⬇️ Build URL: http://downloads.arduino.cc/PR/samd/package_samd-b123_index.json

ℹ️ To test this build:

1. Open the Preferences of the Arduino IDE.
2. Add the Build URL above in the Additional Boards Manager URLs field, and click OK.
3. Open the Boards Manager (menu Tools->Board->Board Manager...)
4. Install Arduino SAMD core - Pull Request Integrate Arduino.org boards #190
5. Select one of the boards under SAMD Pull Request Integrate Arduino.org boards #190 in Tools->Board menu
6. Compile/Upload as usual

[dlabun]

Question: Is it really wise to integrate the Tian in with the rest of the SAMD21 core and not give it a separate core? It seems like there is alot of additional code is being added to support a single board and that code doesn't apply any of the official or 3rd SAMD21 based boards.

[facchinm]

Hi @dlabun ,
in fact the Tian share its variant with all the other Arduino.org boards, so it "naturally" lives in the same repo. The only particular feature is a 2 ports serial-to-usb converter which exposes with the same VID/PID pair on both ports. Only one of those can be used for uploading, the other one is a console directly connected to the Linux processor. Once this is solved, its maintenance will be almost zero 😄

[facchinm]

Merged manually