Atmel AVR Toolchain

For platforms based on the AVR architecture from Atmel we recommend the current version (3.4.x) of the Atmel AVR Toolchain from Atmel:

• for Windows
• [for Linux] (http://www.atmel.com/tools/ATMELAVRTOOLCHAINFORLINUX.aspx)

Custom Toolchain via crossdev (Gentoo only)

For people using Gentoo Linux or a Linux distribution derived from Gentoo it's easys to create a custom toolchain via [crossdev] (http://www.gentoo.org/proj/en/base/embedded/handbook/?part=1&chap=2). In this case a newly compiled toolchain can be created by running:

crossdev -S -t avr

With the -S switch only stable versions will be installed - leave it out to get an unstable version.

Data Type Sizes

sizeof(short): 2
sizeof(int): 2
sizeof(long): 4
sizeof(long long): 8
sizeof(float): 4
sizeof(double): 4