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#!/usr/bin/env python
"""Epics Scaler"""
from .. import Device, poll
class Scaler(Device):
"""
Simple implementation of SynApps Scaler Record.
"""
attrs = ('CNT', 'CONT', 'TP', 'T', 'VAL')
attr_kws = {'calc_enable': '%s_calcEnable.VAL'}
chan_attrs = ('NM%i', 'S%i')
calc_attrs = {'calc%i': '%s_calc%i.VAL', 'expr%i': '%s_calc%i.CALC'}
_nonpvs = ('_prefix', '_pvs', '_delim', '_nchan', '_chans')
def __init__(self, prefix, nchan=8):
self._nchan = nchan
self._chans = range(1, nchan+1)
attrs = list(self.attrs)
for i in self._chans:
for att in self.chan_attrs:
attrs.append(att % i)
Device.__init__(self, prefix, delim='.', attrs=attrs)
for key, val in self.attr_kws.items():
self.add_pv(val % prefix, attr= key)
for i in self._chans:
for key, val in self.calc_attrs.items():
self.add_pv(val % (prefix, i), attr = key % i)
self._mutable = False
def AutoCountMode(self):
"set to autocount mode"
self.put('CONT', 1)
def OneShotMode(self):
"set to one shot mode"
self.put('CONT', 0)
def CountTime(self, ctime):
"set count time"
self.put('TP', ctime)
def Count(self, ctime=None, wait=False):
"set count, with optional counttime"
if ctime is not None:
self.CountTime(ctime)
self.put('CNT', 1, wait=wait)
poll()
def EnableCalcs(self):
" enable calculations"
self.put('calc_enable', 1)
def setCalc(self, i, calc):
"set the calculation for scaler i"
attr = 'expr%i' % i
self.put(attr, calc)
def getNames(self):
"get all names"
return [self.get('NM%i' % i) for i in self._chans]
def Read(self, use_calc=False):
"read all values"
attr = 'S%i'
if use_calc:
attr = 'calc%i'
return [self.get(attr % i) for i in self._chans]
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