ETA/OS is a small scale, embedded kernel and/or operating system. It provides basic hardware abstraction allowing an application programmer to build somewhat portable embedded applications. Some of its features:

• Memory management
• Scheduler (semi-SMP ready)
• Interrupt management
• Timer management
• Driver core
• Bunch of basic drivers (USART etc..)

ETA/OS is licenced as GNU General Public Licence version 3 or newer. The COPYING file should contian more information about the licence, or if it's not included, look at http://www.gnu.org/licences/.

ETA/OS
Copyright (C) 2014, 2015, 2016  ETA/OS developers

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.

To retrieve and build ETA/OS the following tools are required:

Retreiving:

• Git or
• a tarball download

Build tools (for the host and target system):

• GCC tool chain (binutils and gcc)
  • gcc
  • ld
  • as
  • objcopy
• A working Linux distribution (windows isn't supported (yet))

To test:

• simulavr or
• embedded hardware (arduino's etc..)

Before you can build ETA/OS you have to configure it. Run

make menuconfig ARCH=archname

to start the configuration process.

When you are finished configuring the project run the following make commands to fully build ETA/OS:

make prepare ARCH=archname
make all ARCH=archname
make modules_install ARCH=archname INSTALL_MOD_PATH=path

After that, you are ready to compile an application. To compile an application you need application sources and Kbuild file in a sepperate directory (anywhere). See the usr/tests/ directory for some examples.

To see how you can help improving ETA/OS, read the contribution guide. You can find it in the CONTRIBUTING.md file in the repository or on the web.