from malcolm.core import DEFAULT_TIMEOUT, Display, NumberMeta, Part, PartRegistrar
from .. import util
[docs]class CADoublePart(Part):
"""Defines a float64 `Attribute` that talks to a DBR_DOUBLE ao PV"""
def __init__(
self,
name: util.APartName,
description: util.AMetaDescription,
pv: util.APv = "",
rbv: util.ARbv = "",
rbv_suffix: util.ARbvSuffix = "",
min_delta: util.AMinDelta = 0.05,
timeout: util.ATimeout = DEFAULT_TIMEOUT,
sink_port: util.ASinkPort = None,
widget: util.AWidget = None,
group: util.AGroup = None,
config: util.AConfig = True,
display_from_pv: util.AGetLimits = True,
throw: util.AThrow = True,
) -> None:
super().__init__(name)
self.display_from_pv = display_from_pv
self.caa = util.CAAttribute(
NumberMeta("float64", description),
util.catools.DBR_DOUBLE,
pv,
rbv,
rbv_suffix,
min_delta,
timeout,
sink_port,
widget,
group,
config,
on_connect=self._update_display,
throw=throw,
)
def _update_display(self, connected_pv):
if self.display_from_pv:
display = Display(
limitHigh=connected_pv.upper_disp_limit,
limitLow=connected_pv.lower_disp_limit,
precision=connected_pv.precision,
units=connected_pv.units,
)
self.caa.attr.meta.set_display(display)
def setup(self, registrar: PartRegistrar) -> None:
self.caa.setup(registrar, self.name, self.register_hooked)