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This allows a sketch to find out the settings chosen by the USB host (computer) and act accordingly. Other than reading the DTR flag and checking if the baudrate is 1200, the regular CDC code doesn't actually use any of these settings. By exposing these settings to the sketch, it can for example copy them to the hardware UART, turning the Leonardo into a proper USB-to-serial device. This can be useful to let the computer directly talk to whatever device is connected to the hardware serial port (like an XBee module). The Teensy core already supported these methods. This code was independently developed, but the method names were chosen to match the Teensy code, for compatibility (except that `dtr()` and `rtr()` return `bool`, while the Teensy version return a `uint8_t`). This change is applied to both the avr and sam cores, which have a very similar CDC implementation.
Arduino
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Arduino is an open-source physical computing platform based on a simple i/o board and a development environment that implements the Processing/Wiring language. Arduino can be used to develop stand-alone interactive objects or can be connected to software on your computer (e.g. Flash, Processing, MaxMSP). The boards can be assembled by hand or purchased preassembled; the open-source IDE can be downloaded for free at http://www.arduino.cc/en/Main/Software
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For more information, see the website at: http://www.arduino.cc/ or the forums at: http://www.arduino.cc/forum/
You can also follow Arduino on twitter at: https://twitter.com/arduino or like Arduino on Facebook at: https://www.facebook.com/official.arduino -
To report a bug in the software or to request a simple enhancement go to: http://github.com/arduino/Arduino/issues
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More complex requests and technical discussion should go on the Arduino Developers mailing list: https://groups.google.com/a/arduino.cc/forum/#!forum/developers
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If you're interested in modifying or extending the Arduino software, we strongly suggest discussing your ideas on the Developers mailing list before starting to work on them. That way you can coordinate with the Arduino Team and others, giving your work a higher chance of being integrated into the official release https://groups.google.com/a/arduino.cc/forum/#!forum/developers
Installation
Detailed instructions are in reference/Guide_Windows.html and reference/Guide_MacOSX.html. For Linux, see the Arduino playground: http://www.arduino.cc/playground/Learning/Linux
Credits
Arduino is an open source project, supported by many.
The Arduino team is composed of Massimo Banzi, David Cuartielles, Tom Igoe, Gianluca Martino, Daniela Antonietti, and David A. Mellis.
Arduino uses the GNU avr-gcc toolchain, avrdude, avr-libc, and code from Processing and Wiring.
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