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Because UBBR is only 12 bits, we were overflowing it at 300 baud because of the use of the U2X bit. Now we turn off U2X if it would yield a UBBR value that would overflow. Note that this breaks 300 baud communication with the computer on the Uno and Mega 2560 because the 8U2 USB-serial firmware has this same bug (and previously they cancelled each other out). Since, however, it seems more likely that people will need to use 300 baud to communicate with other (legacy) hardware than with the computer, I'm making this change. Issue for 8U2 firmware bug: http://code.google.com/p/arduino/issues/detail?id=542 http://code.google.com/p/arduino/issues/detail?id=522
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://www.arduino.cc/cgi-bin/yabb2/YaBB.pl To report a bug or a make a suggestions, go to: [hardware] http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?board=hwbugs [software] http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?board=swbugs 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 If you are using a USB Arduino, you will need to install the drivers for the FTDI chip on the board. These can be found in the drivers/ directory. * On Windows, plug in the Arduino board and point the Windows Add Hardware wizard to the drivers/FTDI USB Drivers sub-directory of the Arduino application directory. * On the Mac, install the FTDIUSBSerialDriver_10_4_10_5_10_6.mpkg package. * On Linux, drivers are included in kernel versions 2.4.20 or greater. CREDITS Arduino is an open source project, supported by many. The Arduino team is composed of Massimo Banzi, David Cuartielles, Tom Igoe, Gianluca Martino, and David A. Mellis. Arduino uses the GNU avr-gcc toolchain, avrdude, avr-libc, and code from Processing and Wiring. Icon designed by ToDo: http://www.todo.to.it/ "About" image created by Thomas Glaser (envis precisely).