NIST users on Linux need to pay close attention to their ``umask``.
The sledgehammer called ``secureconfig`` leaves you (and root) with umask 027 and files created by root (for example through ``sudo make install``) inaccessible to you.
You can either install Anaconda (choose Python 3.5) from https://store.continuum.io/cshop/anaconda/ or install the more minimalistic Miniconda (choose Python 3.5) from http://conda.pydata.org/miniconda.html
After installing either Anaconda or Miniconda, open a new terminal (also known as command line, console, or shell and denoted here as lines starting with ``$``) and verify the following command works::
Development versions are built for every change and contain more features, but are not as well-tested and are more likely to contain more bugs or inconsistencies than the releases in the ``main`` label.
Then prepare to create a new conda environment with the ARTIQ package and the matching binaries for your hardware:
choose a suitable name for the environment, for example ``artiq-main`` if you intend to track the main label or ``artiq-2016-04-01`` if you consider the environment a snapshot of ARTIQ on 2016-04-01.
Choose the package containing the binaries for your hardware:
When upgrading ARTIQ or when testing different versions it is recommended that new environments are created instead of upgrading the packages in existing environments.
Keep previous environments around until you are certain that they are not needed anymore and a new environment is known to work correctly.
Switching between conda environments using ``$ source deactivate artiq-1.0rc2`` and ``$ source activate artiq-1.0rc1`` is the recommended way to roll back to previous versions of ARTIQ.
You can list the environments you have created using::
OpenOCD can be used to write the binary images into the core device FPGA board's flash memory.
The ``artiq`` or ``artiq-dev`` conda packages install ``openocd`` automatically but it can also be installed explicitly using conda on both Linux and Windows::
Some additional steps are necessary to ensure that OpenOCD can communicate with the FPGA board.
On Linux, first ensure that the current user belongs to the ``plugdev`` group. If it does not, run ``sudo adduser $USER plugdev`` and relogin. Afterwards::
The idle kernel is the kernel (some piece of code running on the core device) which the core device runs whenever it is not connected to a PC via Ethernet.
The idle experiment's ``run()`` method must be a kernel: it must be decorated with the ``@kernel`` decorator (see :ref:`next topic <connecting-to-the-core-device>` for more information about kernels).
..note:: You can find more information about how to use the ``artiq_coreconfig`` utility on the :ref:`Utilities <core-device-configuration-tool>` page.
The startup kernel is executed once when the core device powers up. It should initialize DDSes, set up TTL directions, etc. Proceed as with the idle kernel, but using the ``startup_kernel`` key in ``artiq_coreconfig``.
The core device may use either an external clock signal or its internal clock. This clock can be switched dynamically after the PC is connected using the ``external_clock`` parameter of the core device driver; however, one may want to select the clock at power-up so that it is used for the startup and idle kernels. Use one of these commands: ::
..[1] [Linux] If your shell does not find the ``conda`` command, make sure that the conda binaries are in your ``$PATH``:
If ``$ echo $PATH`` does not show the conda directories, add them: execute ``$ export PATH=$HOME/miniconda3/bin:$PATH`` if you installed conda into ``~/miniconda3``.
