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An environment for writing the code, a compiler for the corresponding language and software for uploading written programs to the controller are needed in order to program the AVR controller. The most comfortable method would be by using special integrated developing environment (IDE). The AVR microcontroller can be programmed in many different programming languages: assembler, C, C+, Pascal, Basic, etc. This book focuses on using the C-language when programming the microcontroller. There is free software for programming AVR microcontroller for both the Windows OS and the Linux OS. The next chapters introduce the usage of both.
All software for passing the exercises can be found from the homepage of the HomeLab