cmake-avr - a cmake toolchain for AVR projects

Testing the example provided

The toolchain was created and tested within the following environment:

Linux

• Arch Linux with kernel 3.12.5-1-ARCH up to 3.16.2-1-ARCH
• cmake version 2.8.12.1 - 3.0.2
• GNU Make 4.0
• avr-gcc (GCC) 4.8.2 - 4.9.1
• avr-binutils 2.23.2-1 - 2.24-2
• avr-libc 1.8.0-5 - 1.8.1-1
• git version 1.8.5.2 - 2.1.0

Windows XP

• cmake version 2.8.10.2
• GNU Make 3.81
• avr-gcc (AVR_8_bit_GNU_Toolchain_3.4.1_798) 4.6.2 (Atmel Studio 6)
• avr-binutils AVR_8_bit_GNU_Toolchain_3.4.1_798 (Atmel Studio 6)
• avr-libc AVR_8_bit_GNU_Toolchain_3.4.1_798 (Atmel Studio 6)
• git version 1.7.11.msysgit.1

Windows 7

• cmake 3.0.2
• Atmel Studio 6.2
• git 1.9.0.msysgit

OS X

• OS X 10.10 with AVR toolchain installed from macports
• cmake 3.0.2
• GNU Make 3.81
• avr-gcc 4.9.1
• avr-libc 1.8.1
• avr-binutils 2.24_1
• git version 2.1.2

Note: If building in a Windows environment, you need to extent the values of the environment variable PATH to the location of the binaries, especially to find make. To enable a more general approach to different Windows toolchains, the variable AVR_FIND_ROOT_PATH needs to be defined. Tested was it with the following setup (XP):

PATH=...;d:/Program Files/Atmel/Atmel Studio 6.0/extensions/Atmel/AVRGCC/3.4.1.81/AVRToolchain/bin;...
AVR_FIND_ROOT_PATH="d:/Program Files/Atmel/Atmel Studio 6.0/extensions/Atmel/AVRGCC/3.4.1.81/AVRToolchain/avr"

Issue within Windows 7 environment With Windows 7 (64bit) and the Atmel Studio 6.2 setup, make.exe now resides differently. It also crashes during the cmake generation process, just after the simple examples to test the compiler (try_compile(...)) ran through. The why and avoidance of this is currently unknown to me. I didn't try to use a cygwin make as a substitute yet.

After getting the project

git clone git@github.com:mkleemann/cmake-avr.git /path/to/clone/in

you just need to run the following commands

mkdir -p /path/to/some/build/dir
cd /path/to/some/build/dir
cmake -DCMAKE_TOOLCHAIN_FILE=/path/to/clone/in/generic-gcc-avr.cmake /path/to/clone/in/example
make

For Windows use:

cmake -G "Unix Makefiles" -DCMAKE_TOOLCHAIN_FILE=/path/to/clone/in/generic-gcc-avr.cmake /path/to/clone/in/example

This just creates the example, but does not upload it. For all possible targets, you need to run

make help

after running the cmake command.

ToDo

• option for target name attachments with MCU type (option -DWITH_MCU=ON (default))
• usage of target names w/o extension for avr_target_link_libraries command
• cleanup baudrate and other AVRDUDE settings
• test in Windows environment
• use add_definition() instead of variables for compiler settings
• some more tests with upload and fuses