Skip to main content

Channel Access server library

Project description

This library contains a low-level binding to the cas library in EPICS base and a thread-safe high level interface to create channel access servers.

Installation

Before installing the library, the environment variables EPICS_BASE and EPICS_HOST_ARCH must be set.

Then the library can be installed with pip:

pip install channel_access.server

If numpy can be imported at install time, numpy support is automatically activated. This can be explicitly controlled with the environment variable CA_WITH_NUMPY:

CA_WITH_NUMPY=0 pip install channel_access.server
CA_WITH_NUMPY=1 pip install channel_access.server

If the package is compiled with numpy support, numpy arrays are used by default. If numpy arrays should not be used, the parameter use_numpy can be set to False.

Example

This example shows a simple server with a PV counting up:

import time
import channel_access.common as ca
import channel_access.server as cas

with cas.Server() as server:
    pv = server.createPV('CAS:Test', ca.Type.LONG)
    while True:
        pv.value += 1
        time.sleep(1.0)

Documentation

The documentation is available online or it can be generated from the source code with sphinx:

cd /path/to/repository
pip install -e .
python setup.py build_sphinx

Then open build/sphinx/html/index.html.

Get the source

The source code is available in a Github repository:

git clone https://github.com/delta-accelerator/channel_access.server

Tests

Tests are run with pytest:

cd /path/to/repository
pytest -v

To run the tests for all supported version use tox:

cd /path/to/repository
tox

Project details


Download files

Download the file for your platform. If you're not sure which to choose, learn more about installing packages.

Files for channel-access.server, version 0.2.0
Filename, size File type Python version Upload date Hashes
Filename, size channel_access.server-0.2.0.tar.gz (24.8 kB) File type Source Python version None Upload date Hashes View

Supported by

Pingdom Pingdom Monitoring Google Google Object Storage and Download Analytics Sentry Sentry Error logging AWS AWS Cloud computing DataDog DataDog Monitoring Fastly Fastly CDN DigiCert DigiCert EV certificate StatusPage StatusPage Status page