caffi 0.99

Channel Access Foreign Function Interface

caffi is the Channel Access Foreign Function Interface. It uses CFFI to call EPICS channel access library.

It is the goal of this package to provide direct low level interface to channel access, alike the C API.

Install

EPICS dynamic libraries have been shipped with the package for Windows, Linux and OS X. But if the environment variables EPICS_BASE and EPICS_HOST_ARCH are set, those libraries under path ${EPICS_BASE}/lib/${EPICS_HOST_ARCH} will be used.

Either use pip,

$ pip install caffi

or checkout source code from the git repository,

$ git clone http://bitbucket.org/xwang/caffi
$ cd caffi
$ python setup.py install

Documents

Latest documents are hosted at Read the Dcos.

Example

import sys
import caffi.ca as ca

context = ca.create_context()

status, chid = ca.create_channel('catest')
assert status == ca.ECA.NORMAL

status = ca.pend_io(3)
assert status == ca.ECA.NORMAL

status, value = ca.get(chid)
assert status == ca.ECA.NORMAL

status = ca.pend_io(3)
assert status == ca.ECA.NORMAL

print(value.get())