AVR chips can be programmed using a variety of hardware from a simple serial cable to a dedicated AVR programmer and development station.
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While each of these methods has it's own benefits and drawbacks, I will focus on using an Arduino.
The Arduino is a large micro-controller prototyping platform. Arduino Uno has its IO pins broken out with headers attached. It is fully contained with all the needed parts to run the on board micro-controller such as a crystal and power supply regulation. It also has its own IDE and programming language that is quite similar to C. Using a program, it can be used to flash new software onto AVR chips.
Fortunately, gcc is supporting the AVR cpu for quite some time now and e.g. The WinAVR toolchain for AVR development under windows is based on this compiler. Many people have already ported these compilers to MacOS X incl. The fink project and others.
Avr-gcc Mac Os
The IDE includes a program called ArduinoISP that is supposed to do just that. Unfortunately, it is very finicky and rarely works with some models of Arduino. A variant on the program made by Adafruit that works more consistently can be found at this location.
Avr-gcc Compiler
If you are using Arduino Uno, then I recommend the latter program as I had much trouble with the official one. Download super metroid for computer.
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