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Before, this decision was made in few different places, based on sometimes different register defines. Now, HardwareSerial.h decides wich UARTS are available, defines USE_HWSERIALn macros and HardwareSerial.cpp simply checks these macros (together with some #ifs to decide which registers to use for UART 0). For consistency, USBAPI.h also defines a HAVE_CDCSERIAL macro when applicable. For supported targets, this should change any behaviour. For unsupported targets, the error messages might subtly change because some checks are moved or changed. Additionally, this moves the USBAPI.h include form HardareSerial.h into Arduino.h and raises an error when both CDC serial and UART0 are available (previously this would silently use UART0 instead of CDC, but there is not currently any Atmel chip available for which this would occur).
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. For more information, see the website at: http://www.arduino.cc/ or the forums at: http://arduino.cc/forum/ To report a *bug* in the software or to request *a simple enhancement* go to: http://github.com/arduino/Arduino/issues More complex requests and technical discussion should go on the Arduino Developers mailing list: https://groups.google.com/a/arduino.cc/forum/#!forum/developers 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. Icon and about image designed by ToDo: http://www.todo.to.it/