README: rewritten to be up to date

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Getting the source
==================
# ArduPilot Project
We'll assume you are putting the source in `/home/name/ardupilot`.
## Getting the source
You can either download the source using the "ZIP" button at
https://github.com/diydrones/ardupilot, or you can grab it from github
using git:
You can either download the source using the "ZIP" button at the top of the
github page, or you can make a clone using git:
```
git clone git://github.com/diydrones/ardupilot.git
```
Building using Arduino
======================
## Building using Arduino IDE
First install the libraries:
ArduPilot is no longer compatible with the standard Arduino distribution.
You need to use a patched Arduino IDE to build ArduPilot.
1. Copy the `libraries` directory to your
`/path/to/arduino/hardware/libraries/` or
`/path/to/arduino/libraries` directory.
1. The patched ArduPilot Arduino IDE is available for Mac and Windows from
the [downloads page][1]. On Linux, you should use the makefile build.
2. Restart the Arduino IDE.
2. Unpack and launch the ArduPilot Arduino IDE. In the preferences menu, set
your sketchbook location to your downloaded or cloned `ardupilot` directory.
Each library comes with a simple example. You can find the examples in
the menu File→Examples
3. In the ArduPilot Arduino IDE, select your ArduPilot type (APM1 or APM2) from
the ArduPilot menu (in the top menubar).
Building using make
===================
4. Restart the ArduPilot Arduino IDE. You should now be able to build ArduPlane
or ArduCopter from source.
1. Go to the directory of the sketch and type `make`.
5. Remember that, after changing ArduPilot type (APM1 or APM2) in the IDE,
you'll need to close and restart the IDE before continuing.
2. Type `make upload` to upload according to the parameters in
`config.mk`.
For example:
```
cd ArduPlane # or ArduCopter etc.
make
make upload
```
Building using cmake
====================
```
cd ArduPlane # or ArduCopter etc.
mkdir build
cd build
# If you have Arduino installed in a non-standard location you by
# specify it by using -DARDUINO_SDK_PATH=/path/to/arduino
cmake .. -DAPM_BOARD=mega -DAPM_PORT=/dev/ttyUSB0 # Or -DAPM_BOARD=mega2560
make # Will build the sketch.
make ArduPlane-upload # Will upload the sketch.
```
If you have a sync error during upload, reset the board or power cycle
the board before the upload starts.
Building using Eclipse
======================
Generating the Eclipse project for your system
----------------------------------------------
```
mkdir /home/name/apm-build
cd /home/name/apm-build
cmake -G"Eclipse CDT4 - Unix Makefiles" \
-D CMAKE_BUILD_TYPE=Debug \
-D BOARD=mega \
-D PORT=/dev/ttyUSB0 \
../ardupilot/ArduCopter
```
Change the `../ardupilot/ArduCopter` above to be whatever sketch you
want to build.
_Note: Unix can be substituted for MinGW/MSYS/NMake (for Windows).
See http://www.vtk.org/Wiki/Eclipse_CDT4_Generator)._
### Define options
* `CMAKE_BUILD_TYPE` choose from `DEBUG`, `RELEASE` etc.
* `PORT` is the port for uploading to the board, `COM0` etc. on
Windows, `/dev/ttyUSB0` etc. on Linux.
* `BOARD` is your board type, `mega` for the 1280 or `mega2560` for
the 2560 boards.
* `ARDUINO_SDK_PATH` to specify the path to your Arduino installation
if it isn't in the default path.
Importing the Eclipse build project
-----------------------------------
1. Import project using Menu File→Import.
2. Select General→Existing projects into workspace.
3. Browse to where your build tree is and select the root build tree
directory.
4. Keep "Copy projects into workspace" unchecked.
You should now have a fully functional eclipse project.
Importing the Eclipse source project
------------------------------------
You can also import the source repository (`/home/name/ardupilot`) if you
want to modify the source/commit using git.
Configuring Eclipse to recognize PDE files
------------------------------------------
* File association: Go to Window→Preferences→General→Content
Types. This tree associates a filename or filename pattern with its
content type so that tools can treat it properly. Source and header
files for most languages are under the Text tree. Add "*.pde" as a
C++ Source.
* Autocompletion: Right click on source project→Properties→Project
References→apm-build Project
* Regenerating the Eclipse source project file: `cmake -G"Eclipse
CDT4 - Unix Makefiles" -DECLIPSE_CDT4_GENERATE_SOURCE_PROJECT=TRUE
/home/name/ardupilot`
[1]: http://code.google.com/p/ardupilot-mega/downloads/list
Build a package using cpack
===========================
```
cd build
cmake ..
make package
make package_source
```
## Building using make
1. Before you build the project for the first time, you'll need to run
`make configure` from a sketch directory. This will create a `config.mk`
file at the top level of the repository. You can set some defaults in
`config.mk`
2. In the sketch directory, type `make` to build for APM2. Alternatively,
`make apm1` will build for the APM1.
3. Type `make upload` to upload. You may need to set the correct default
serial port in your `config.mk`.
# User Technical Support
ArduPilot users should use the DIYDrones.com forums for technical support.
# Development Team
The ArduPilot project is open source and maintained by a team of volunteers.
To contribute, you can send a pull request on Github. You can also join the
[development discussion on Google Groups][2]. Note that the Google Groups
mailing lists are NOT for user tech support, and are moderated for new users to
prevent off-topic discussion.
[2]: https://groups.google.com/forum/?fromgroups#!forum/drones-discuss