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scaler.py
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scaler.py
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import logging
from collections import OrderedDict
from .ophydobj import Kind
from .signal import (EpicsSignal, EpicsSignalRO)
from .device import Device
from .device import (Component as Cpt, DynamicDeviceComponent as DDCpt,
FormattedComponent as FCpt)
logger = logging.getLogger(__name__)
def _scaler_fields(cls, attr_base, field_base, range_, **kwargs):
defn = OrderedDict()
for i in range_:
attr = '{attr}{i}'.format(attr=attr_base, i=i)
suffix = '{field}{i}'.format(field=field_base, i=i)
defn[attr] = (cls, suffix, kwargs)
return defn
class EpicsScaler(Device):
'''SynApps Scaler Record interface'''
# tigger + trigger mode
count = Cpt(EpicsSignal, '.CNT', trigger_value=1, kind=Kind.omitted)
count_mode = Cpt(EpicsSignal, '.CONT', string=True, kind=Kind.config)
# delay from triggering to starting counting
delay = Cpt(EpicsSignal, '.DLY', kind=Kind.config)
auto_count_delay = Cpt(EpicsSignal, '.DLY1', kind=Kind.config)
# the data
channels = DDCpt(_scaler_fields(EpicsSignalRO, 'chan', '.S', range(1, 33),
kind=Kind.hinted))
names = DDCpt(_scaler_fields(EpicsSignal, 'name', '.NM', range(1, 33),
kind=Kind.config))
time = Cpt(EpicsSignal, '.T', kind=Kind.config)
freq = Cpt(EpicsSignal, '.FREQ', kind=Kind.config)
preset_time = Cpt(EpicsSignal, '.TP', kind=Kind.config)
auto_count_time = Cpt(EpicsSignal, '.TP1', kind=Kind.config)
presets = DDCpt(_scaler_fields(EpicsSignal, 'preset', '.PR', range(1, 33),
kind=Kind.omitted))
gates = DDCpt(_scaler_fields(EpicsSignal, 'gate', '.G', range(1, 33),
kind=Kind.omitted))
update_rate = Cpt(EpicsSignal, '.RATE', kind=Kind.config)
auto_count_update_rate = Cpt(EpicsSignal, '.RAT1', kind=Kind.config)
egu = Cpt(EpicsSignal, '.EGU', kind=Kind.config)
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
self.stage_sigs.update([('count_mode', 0)])
class ScalerChannel(Device):
# TODO set up monitor on this to automatically change the name
chname = FCpt(EpicsSignal, '{self.prefix}.NM{self._ch_num}',
kind=Kind.config)
s = FCpt(EpicsSignalRO, '{self.prefix}.S{self._ch_num}',
kind=Kind.hinted, auto_monitor=False)
preset = FCpt(EpicsSignal, '{self.prefix}.PR{self._ch_num}',
kind=Kind.config)
gate = FCpt(EpicsSignal, '{self.prefix}.G{self._ch_num}', string=True,
kind=Kind.config)
def __init__(self, prefix, ch_num,
**kwargs):
self._ch_num = ch_num
super().__init__(prefix, **kwargs)
self.match_name()
def match_name(self):
self.s.name = self.chname.get()
def _sc_chans(attr_fix, id_range):
defn = OrderedDict()
for k in id_range:
defn['{}{:02d}'.format(attr_fix, k)] = (ScalerChannel,
'', {'ch_num': k,
'kind': Kind.normal})
return defn
class ScalerCH(Device):
# The data
channels = DDCpt(_sc_chans('chan', range(1, 33)))
# tigger + trigger mode
count = Cpt(EpicsSignal, '.CNT', trigger_value=1, kind=Kind.omitted)
count_mode = Cpt(EpicsSignal, '.CONT', string=True, kind=Kind.config)
# delay from triggering to starting counting
delay = Cpt(EpicsSignal, '.DLY', kind=Kind.config)
auto_count_delay = Cpt(EpicsSignal, '.DLY1', kind=Kind.config)
time = Cpt(EpicsSignal, '.T')
freq = Cpt(EpicsSignal, '.FREQ', kind=Kind.config)
preset_time = Cpt(EpicsSignal, '.TP', kind=Kind.config)
auto_count_time = Cpt(EpicsSignal, '.TP1', kind=Kind.config)
update_rate = Cpt(EpicsSignal, '.RATE', kind=Kind.omitted)
auto_count_update_rate = Cpt(EpicsSignal, '.RAT1', kind=Kind.omitted)
egu = Cpt(EpicsSignal, '.EGU', kind=Kind.config)
def match_names(self):
for s in self.channels.component_names:
getattr(self.channels, s).match_name()
def select_channels(self, chan_names=None):
'''Select channels based on the EPICS name PV
Parameters
----------
chan_names : Iterable[str] or None
The names (as reported by the ``channel.chname`` signal)
of the channels to select.
If ``None``, select **all** channels named in the EPICS scaler.
'''
self.match_names()
name_map = {}
for s in self.channels.component_names:
scaler_channel = getattr(self.channels, s)
nm = scaler_channel.s.name # as defined in self.match_names()
if len(nm) > 0:
name_map[nm] = s
if chan_names is None:
chan_names = name_map.keys()
read_attrs = []
for ch in chan_names:
try:
read_attrs.append(name_map[ch])
except KeyError:
raise RuntimeError("The channel {} is not configured "
"on the scaler. The named channels are "
"{}".format(ch, tuple(name_map)))
self.channels.kind = Kind.normal
self.channels.read_attrs = list(read_attrs)
self.channels.configuration_attrs = list(read_attrs)
for ch in read_attrs[1:]:
getattr(self.channels, ch).s.kind = Kind.hinted