AvrLib

Avrlib is a library of easy-to-use C functions for a variety of tasks on the Atmel AVR microcontroller. It gives high-level functions for accomplishing tasks that might otherwise be tedious to program. These include serial communication, analog-to-digital conversion, displaying text on LCD displays and interfacing to a whole range of other devices such as hard drives, GPS units, Ethernet devices and sensors. The avrlib is distributed under a GNU Public License. For more information read the AVR @ CCRMA Programming guide HERE.