counter.py 6.87 KB
Newer Older
1
2
3
4
5
6
7
8
9
10
11
# -*- coding: utf-8 -*-
#
# This file is part of the bliss project
#
# Copyright (c) 2017 Beamline Control Unit, ESRF
# Distributed under the GNU LGPLv3. See LICENSE for more info.

import numpy
import time
from gevent import event,sleep
from bliss.common.event import dispatcher
12
from ..chain import AcquisitionDevice,AcquisitionChannel
13
from bliss.common.measurement import SamplingCounter
14
15

class CounterAcqDevice(AcquisitionDevice):
16
17
    SIMPLE_AVERAGE,TIME_AVERAGE,INTEGRATE = range(3)

18
    def __init__(self,counter,
19
20
21
22
23
24
25
26
27
28
29
30
31
                 count_time=None,npoints=1,
                 mode=SIMPLE_AVERAGE,**keys):
        """
        Helper to manage acquisition of a sampling counter.

        count_time -- the master integration time.
        npoints -- number of point for this acquisition
        mode -- three mode are available *SIMPLE_AVERAGE* (the default)
        which sum all the sampling values and divide by the number of read value.
        the *TIME_AVERAGE* which sum all integration  then divide by the sum
        of time spend to measure all values. And *INTEGRATION* which sum all integration
        and then normalize it when the *count_time*.
        """
32
33
34
35
36
37
38
39
40
        prepare_once = keys.pop('prepare_once',npoints > 1 and True or False)
        start_once = keys.pop('start_once',npoints > 1 and True or False)
        npoints = max(1,npoints)
        AcquisitionDevice.__init__(self, counter, counter.name, "zerod",
                                   npoints=npoints,
                                   trigger_type=AcquisitionDevice.SOFTWARE,
                                   prepare_once=prepare_once,
                                   start_once=start_once,
                                   **keys)
41
        self._count_time = count_time
42
        if not isinstance(counter,SamplingCounter.ReadAllHandler):
43
            self.channels.append(AcquisitionChannel(counter.name,numpy.double, (1,)))
44
45
46
47
48
        self._nb_acq_points = 0
        self._event = event.Event()
        self._stop_flag = False
        self._ready_event = event.Event()
        self._ready_flag = True
49
        self.__mode = mode
50
        self.__counters_list = list()
51
52
53
54
55
56
57

    @property
    def mode(self):
        return self.__mode
    @mode.setter
    def mode(self,value):
        self.__mode = value
58

59
    def add_counter_to_read(self,counter):
60
        self.__counters_list.append(counter)
61
62
        self.channels.append(AcquisitionChannel(counter.name,numpy.double, (1,)))

63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
    def prepare(self):
        self._nb_acq_points = 0
        self._stop_flag = False
        self._ready_flag = True
        self._event.clear()

    def start(self):
        pass

    def stop(self):
        self._stop_flag = True
        self._trig_time = None
        self._event.set()

    def trigger(self):
        self._trig_time = time.time()
        self._event.set()

    def wait_ready(self):
        """
        will wait until the last triggered point is read
        """
        while not self._ready_flag:
            self._ready_event.wait()
            self._ready_event.clear()

    def reading(self):
90
        counter_name = [x.name for x in self.channels]
91
        if isinstance(self.device, SamplingCounter.GroupedReadHandler):
92
            def read():
93
                return numpy.array(self.device.read(*self.__counters_list),
94
95
96
97
98
                                   dtype=numpy.double)
        else:                   # read_all
            def read():
                return numpy.array(self.device.read(),
                                   dtype=numpy.double)
99
100
101
102
103
104
105
106
107
108
109
        while self._nb_acq_points < self.npoints:
            #trigger wait
            self._event.wait()
            self._event.clear()
            self._ready_flag = False
            trig_time = self._trig_time
            if trig_time is None: continue
            if self._stop_flag: break

            nb_read = 0
            acc_read_time = 0
110
            acc_value = numpy.zeros((len(counter_name),),dtype=numpy.double)
111
            stop_time = trig_time + self._count_time or 0
112
113
114
            #Counter integration loop
            while not self._stop_flag:
                start_read = time.time()
115
                read_value = read()
116
                end_read = time.time()
117
118
119
120
121
122
                read_time = end_read - start_read
                
                if self.__mode != CounterAcqDevice.TIME_AVERAGE:
                    acc_value += read_value
                else:
                    acc_value += read_value * (end_read - start_read)
123
124
125
126
127
128
129
130
                nb_read += 1
                acc_read_time += end_read - start_read

                current_time = time.time()
                if (current_time + (acc_read_time / nb_read)) > stop_time:
                    break
                sleep(0) # Be able to kill the task
            self._nb_acq_points += 1
131
132
133
134
135
136
137
138
139
            if self.__mode == CounterAcqDevice.TIME_AVERAGE:
                data = acc_value / nb_read
            else:
                data = acc_value / acc_read_time
                
            if self.__mode == CounterAcqDevice.INTEGRATE:
                data *= self._count_time
            
            channel_data = {name:data[index] for index,name in enumerate(counter_name)}
140
            dispatcher.send("new_data",self,
141
                            {"channel_data": channel_data})
142
143
            self._ready_flag = True
            self._ready_event.set()
144
            
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188

class IntegratingAcqDevice(AcquisitionDevice):
    def __init__(self,integrating_device,
                 count_time=None,npoints=1,**keys):
        prepare_once = keys.pop('prepare_once',npoints > 1 and True or False)
        start_once = keys.pop('start_once',npoints > 1 and True or False)
        npoints = max(1,npoints)
        AcquisitionDevice.__init__(self, counter, integrating_device.name, "zerod",
                                   npoints=npoints,
                                   trigger_type=AcquisitionDevice.SOFTWARE,
                                   prepare_once=prepare_once,
                                   start_once=start_once,
                                   **keys)
        self._count_time = count_time
        self.channels.append(AcquisitionChannel(integrating_device.name,numpy.double, (1,)))
        self._nb_acq_points = 0

    def prepare(self):
        self._nb_acq_points = 0
        self._stop_flag = False

    def start(self):
        pass

    def stop(self):
        self._stop_flag = True

    def trigger(self):
        pass
    
    def reading(self):
        from_point_index = 0
        while self._nb_acq_points < self.npoints and not self._stop_flag:
            data = self.device.get_value(from_point_index)
            if data:
                from_point_index += len(data)
                self._nb_acq_points += len(data)
                channel_data = {self.name:data}
                dispatcher.send("new_data",self,
                                {"channel_data": channel_data})
                gevent.idle()
            else:
                gevent.sleep(count_time/2.)