"""
Scaler support
+++++++++++++++++++++++++++++++++++++++
.. autosummary::
~use_EPICS_scaler_channels
"""
from ophyd import EpicsScaler
from ophyd.scaler import ScalerCH
import epics
# for convenience
SCALER_AUTOCOUNT_MODE = 1 # TODO: contribute to ophyd?
[docs]def use_EPICS_scaler_channels(scaler):
"""
configure scaler for only the channels with names assigned in EPICS
Note: For `ScalerCH`, use `scaler.select_channels(None)` instead of this code.
(Applies only to `ophyd.scaler.ScalerCH` in releases after 2019-02-27.)
"""
if isinstance(scaler, EpicsScaler):
read_attrs = []
for ch in scaler.channels.component_names:
_nam = epics.caget(f"{scaler.prefix}.NM{int(ch[4:])}")
if len(_nam.strip()) > 0:
read_attrs.append(ch)
scaler.channels.read_attrs = read_attrs
elif isinstance(scaler, ScalerCH):
# superceded by: https://github.com/NSLS-II/ophyd/commit/543e7ef81f3cb760192a0de719e51f9359642ae8
scaler.match_names()
read_attrs = []
configuration_attrs = []
for ch in scaler.channels.component_names:
nm_pv = scaler.channels.__getattribute__(ch)
if nm_pv is not None and len(nm_pv.chname.get().strip()) > 0:
read_attrs.append(ch)
configuration_attrs.append(ch)
configuration_attrs.append(ch + ".chname")
configuration_attrs.append(ch + ".preset")
configuration_attrs.append(ch + ".gate")
scaler.channels.read_attrs = read_attrs
scaler.channels.configuration_attrs = configuration_attrs
# -----------------------------------------------------------------------------
# :author: Pete R. Jemian
# :email: jemian@anl.gov
# :copyright: (c) 2017-2022, UChicago Argonne, LLC
#
# Distributed under the terms of the Creative Commons Attribution 4.0 International Public License.
#
# The full license is in the file LICENSE.txt, distributed with this software.
# -----------------------------------------------------------------------------