mirror of
https://github.com/ARM-software/workload-automation.git
synced 2025-04-07 11:20:47 +01:00
c239322c4d
- Now works with earlier versions of the DAQmx driver. This is needed to be able to run the server on Linux systems, which support older verisions of the driver only. - DAQ error messages are now properly propaged to the client (PyDAQmx uses "mess" rather than "message" attribute to store the message in the Exception obejects). - pylint and pep8 fixes
348 lines
12 KiB
Python
348 lines
12 KiB
Python
# Copyright 2013-2015 ARM Limited
|
|
#
|
|
# Licensed under the Apache License, Version 2.0 (the "License");
|
|
# you may not use this file except in compliance with the License.
|
|
# You may obtain a copy of the License at
|
|
#
|
|
# http://www.apache.org/licenses/LICENSE-2.0
|
|
#
|
|
# Unless required by applicable law or agreed to in writing, software
|
|
# distributed under the License is distributed on an "AS IS" BASIS,
|
|
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
# See the License for the specific language governing permissions and
|
|
# limitations under the License.
|
|
#
|
|
|
|
"""
|
|
Creates a new DAQ device class. This class assumes that there is a
|
|
DAQ connected and mapped as Dev1. It assumes a specific syndesmology on the DAQ (it is not
|
|
meant to be a generic DAQ interface). The following diagram shows the wiring for one DaqDevice
|
|
port::
|
|
|
|
Port 0
|
|
========
|
|
| A0+ <--- Vr -------------------------|
|
|
| |
|
|
| A0- <--- GND -------------------// |
|
|
| |
|
|
| A1+ <--- V+ ------------|-------V+ |
|
|
| r | |
|
|
| A1- <--- Vr --/\/\/\----| |
|
|
| | |
|
|
| | |
|
|
| |--------------------------|
|
|
========
|
|
|
|
:number_of_ports: The number of ports connected on the DAQ. Each port requires 2 DAQ Channels
|
|
one for the source voltage and one for the Voltage drop over the
|
|
resistor r (V+ - Vr) allows us to detect the current.
|
|
:resistor_value: The resistance of r. Typically a few milliOhm
|
|
:downsample: The number of samples combined to create one Power point. If set to one
|
|
each sample corresponds to one reported power point.
|
|
:sampling_rate: The rate at which DAQ takes a sample from each channel.
|
|
|
|
"""
|
|
# pylint: disable=F0401,E1101,W0621,no-name-in-module
|
|
import os
|
|
import sys
|
|
import csv
|
|
import time
|
|
import threading
|
|
from Queue import Queue, Empty
|
|
|
|
import numpy
|
|
|
|
from PyDAQmx import Task, DAQError
|
|
try:
|
|
from PyDAQmx.DAQmxFunctions import DAQmxGetSysDevNames
|
|
CAN_ENUMERATE_DEVICES = True
|
|
except ImportError: # earlier driver version
|
|
DAQmxGetSysDevNames = None
|
|
CAN_ENUMERATE_DEVICES = False
|
|
|
|
from PyDAQmx.DAQmxTypes import int32, byref, create_string_buffer
|
|
from PyDAQmx.DAQmxConstants import (DAQmx_Val_Diff, DAQmx_Val_Volts, DAQmx_Val_GroupByScanNumber, DAQmx_Val_Auto,
|
|
DAQmx_Val_Rising, DAQmx_Val_ContSamps)
|
|
|
|
try:
|
|
from PyDAQmx.DAQmxConstants import DAQmx_Val_Acquired_Into_Buffer
|
|
callbacks_supported = True
|
|
except ImportError: # earlier driver version
|
|
DAQmx_Val_Acquired_Into_Buffer = None
|
|
callbacks_supported = False
|
|
|
|
|
|
from daqpower import log
|
|
|
|
|
|
def list_available_devices():
|
|
"""Returns the list of DAQ devices visible to the driver."""
|
|
if DAQmxGetSysDevNames:
|
|
bufsize = 2048 # Should be plenty for all but the most pathalogical of situations.
|
|
buf = create_string_buffer('\000' * bufsize)
|
|
DAQmxGetSysDevNames(buf, bufsize)
|
|
return buf.value.split(',')
|
|
else:
|
|
return []
|
|
|
|
|
|
class ReadSamplesBaseTask(Task):
|
|
|
|
def __init__(self, config, consumer):
|
|
Task.__init__(self)
|
|
self.config = config
|
|
self.consumer = consumer
|
|
self.sample_buffer_size = (self.config.sampling_rate + 1) * self.config.number_of_ports * 2
|
|
self.samples_read = int32()
|
|
self.remainder = []
|
|
# create voltage channels
|
|
for i in xrange(0, 2 * self.config.number_of_ports, 2):
|
|
self.CreateAIVoltageChan('{}/ai{}'.format(config.device_id, config.channel_map[i]),
|
|
'', DAQmx_Val_Diff,
|
|
-config.v_range, config.v_range,
|
|
DAQmx_Val_Volts, None)
|
|
self.CreateAIVoltageChan('{}/ai{}'.format(config.device_id, config.channel_map[i + 1]),
|
|
'', DAQmx_Val_Diff,
|
|
-config.dv_range, config.dv_range,
|
|
DAQmx_Val_Volts, None)
|
|
# configure sampling rate
|
|
self.CfgSampClkTiming('',
|
|
self.config.sampling_rate,
|
|
DAQmx_Val_Rising,
|
|
DAQmx_Val_ContSamps,
|
|
self.config.sampling_rate)
|
|
|
|
|
|
class ReadSamplesCallbackTask(ReadSamplesBaseTask):
|
|
"""
|
|
More recent verisons of the driver (on Windows) support callbacks
|
|
|
|
"""
|
|
|
|
def __init__(self, config, consumer):
|
|
ReadSamplesBaseTask.__init__(self, config, consumer)
|
|
# register callbacks
|
|
self.AutoRegisterEveryNSamplesEvent(DAQmx_Val_Acquired_Into_Buffer, self.config.sampling_rate // 2, 0)
|
|
self.AutoRegisterDoneEvent(0)
|
|
|
|
def EveryNCallback(self):
|
|
# Note to future self: do NOT try to "optimize" this but re-using the same array and just
|
|
# zeroing it out each time. The writes happen asynchronously and if your zero it out too soon,
|
|
# you'll see a whole bunch of 0.0's in the output. If you wanna go down that route, you'll need
|
|
# cycler through several arrays and have the code that's actually doing the writing zero them out
|
|
# mark them as available to be used by this call. But, honestly, numpy array allocation does not
|
|
# appear to be a bottleneck at the moment, so the current solution is "good enough".
|
|
samples_buffer = numpy.zeros((self.sample_buffer_size,), dtype=numpy.float64)
|
|
self.ReadAnalogF64(DAQmx_Val_Auto, 0.0, DAQmx_Val_GroupByScanNumber, samples_buffer,
|
|
self.sample_buffer_size, byref(self.samples_read), None)
|
|
self.consumer.write((samples_buffer, self.samples_read.value))
|
|
|
|
def DoneCallback(self, status): # pylint: disable=W0613,R0201
|
|
return 0 # The function should return an integer
|
|
|
|
|
|
class ReadSamplesThreadedTask(ReadSamplesBaseTask):
|
|
"""
|
|
Earlier verisons of the driver (on CentOS) do not support callbacks. So need
|
|
to create a thread to periodically poll the buffer
|
|
|
|
"""
|
|
|
|
def __init__(self, config, consumer):
|
|
ReadSamplesBaseTask.__init__(self, config, consumer)
|
|
self.poller = DaqPoller(self)
|
|
|
|
def StartTask(self):
|
|
ReadSamplesBaseTask.StartTask(self)
|
|
self.poller.start()
|
|
|
|
def StopTask(self):
|
|
self.poller.stop()
|
|
ReadSamplesBaseTask.StopTask(self)
|
|
|
|
|
|
class DaqPoller(threading.Thread):
|
|
|
|
def __init__(self, task, wait_period=1):
|
|
super(DaqPoller, self).__init__()
|
|
self.task = task
|
|
self.wait_period = wait_period
|
|
self._stop_signal = threading.Event()
|
|
self.samples_buffer = numpy.zeros((self.task.sample_buffer_size,), dtype=numpy.float64)
|
|
|
|
def run(self):
|
|
while not self._stop_signal.is_set():
|
|
# Note to future self: see the comment inside EventNCallback() above
|
|
samples_buffer = numpy.zeros((self.task.sample_buffer_size,), dtype=numpy.float64)
|
|
try:
|
|
self.task.ReadAnalogF64(DAQmx_Val_Auto, self.wait_period, DAQmx_Val_GroupByScanNumber, samples_buffer,
|
|
self.task.sample_buffer_size, byref(self.task.samples_read), None)
|
|
except DAQError:
|
|
pass
|
|
self.task.consumer.write((samples_buffer, self.task.samples_read.value))
|
|
|
|
def stop(self):
|
|
self._stop_signal.set()
|
|
self.join()
|
|
|
|
|
|
class AsyncWriter(threading.Thread):
|
|
|
|
def __init__(self, wait_period=1):
|
|
super(AsyncWriter, self).__init__()
|
|
self.daemon = True
|
|
self.wait_period = wait_period
|
|
self.running = threading.Event()
|
|
self._stop_signal = threading.Event()
|
|
self._queue = Queue()
|
|
|
|
def write(self, stuff):
|
|
if self._stop_signal.is_set():
|
|
raise IOError('Attempting to writer to {} after it has been closed.'.format(self.__class__.__name__))
|
|
self._queue.put(stuff)
|
|
|
|
def do_write(self, stuff):
|
|
raise NotImplementedError()
|
|
|
|
def run(self):
|
|
self.running.set()
|
|
while True:
|
|
if self._stop_signal.is_set() and self._queue.empty():
|
|
break
|
|
try:
|
|
self.do_write(self._queue.get(block=True, timeout=self.wait_period))
|
|
except Empty:
|
|
pass # carry on
|
|
self.running.clear()
|
|
|
|
def stop(self):
|
|
self._stop_signal.set()
|
|
|
|
def wait(self):
|
|
while self.running.is_set():
|
|
time.sleep(self.wait_period)
|
|
|
|
|
|
class PortWriter(object):
|
|
|
|
def __init__(self, path):
|
|
self.path = path
|
|
self.fh = open(path, 'w', 0)
|
|
self.writer = csv.writer(self.fh)
|
|
self.writer.writerow(['power', 'voltage'])
|
|
|
|
def write(self, row):
|
|
self.writer.writerow(row)
|
|
|
|
def close(self):
|
|
self.fh.close()
|
|
|
|
def __del__(self):
|
|
self.close()
|
|
|
|
|
|
class SamplePorcessorError(Exception):
|
|
pass
|
|
|
|
|
|
class SampleProcessor(AsyncWriter):
|
|
|
|
def __init__(self, resistor_values, output_directory, labels):
|
|
super(SampleProcessor, self).__init__()
|
|
self.resistor_values = resistor_values
|
|
self.output_directory = output_directory
|
|
self.labels = labels
|
|
self.number_of_ports = len(resistor_values)
|
|
if len(self.labels) != self.number_of_ports:
|
|
message = 'Number of labels ({}) does not match number of ports ({}).'
|
|
raise SamplePorcessorError(message.format(len(self.labels), self.number_of_ports))
|
|
self.port_writers = []
|
|
|
|
def do_write(self, sample_tuple):
|
|
samples, number_of_samples = sample_tuple
|
|
for i in xrange(0, number_of_samples * self.number_of_ports * 2, self.number_of_ports * 2):
|
|
for j in xrange(self.number_of_ports):
|
|
V = float(samples[i + 2 * j])
|
|
DV = float(samples[i + 2 * j + 1])
|
|
P = V * (DV / self.resistor_values[j])
|
|
self.port_writers[j].write([P, V])
|
|
|
|
def start(self):
|
|
for label in self.labels:
|
|
port_file = self.get_port_file_path(label)
|
|
writer = PortWriter(port_file)
|
|
self.port_writers.append(writer)
|
|
super(SampleProcessor, self).start()
|
|
|
|
def stop(self):
|
|
super(SampleProcessor, self).stop()
|
|
self.wait()
|
|
for writer in self.port_writers:
|
|
writer.close()
|
|
|
|
def get_port_file_path(self, port_id):
|
|
if port_id in self.labels:
|
|
return os.path.join(self.output_directory, port_id + '.csv')
|
|
else:
|
|
raise SamplePorcessorError('Invalid port ID: {}'.format(port_id))
|
|
|
|
def __del__(self):
|
|
self.stop()
|
|
|
|
|
|
class DaqRunner(object):
|
|
|
|
@property
|
|
def number_of_ports(self):
|
|
return self.config.number_of_ports
|
|
|
|
def __init__(self, config, output_directory):
|
|
self.config = config
|
|
self.processor = SampleProcessor(config.resistor_values, output_directory, config.labels)
|
|
if callbacks_supported:
|
|
self.task = ReadSamplesCallbackTask(config, self.processor)
|
|
else:
|
|
self.task = ReadSamplesThreadedTask(config, self.processor)
|
|
self.is_running = False
|
|
|
|
def start(self):
|
|
log.debug('Starting sample processor.')
|
|
self.processor.start()
|
|
log.debug('Starting DAQ Task.')
|
|
self.task.StartTask()
|
|
self.is_running = True
|
|
log.debug('Runner started.')
|
|
|
|
def stop(self):
|
|
self.is_running = False
|
|
log.debug('Stopping DAQ Task.')
|
|
self.task.StopTask()
|
|
log.debug('Stopping sample processor.')
|
|
self.processor.stop()
|
|
log.debug('Runner stopped.')
|
|
|
|
def get_port_file_path(self, port_id):
|
|
return self.processor.get_port_file_path(port_id)
|
|
|
|
|
|
if __name__ == '__main__':
|
|
from collections import namedtuple
|
|
DeviceConfig = namedtuple('DeviceConfig', ['device_id', 'channel_map', 'resistor_values',
|
|
'v_range', 'dv_range', 'sampling_rate',
|
|
'number_of_ports', 'labels'])
|
|
channel_map = (0, 1, 2, 3, 4, 5, 6, 7, 16, 17, 18, 19, 20, 21, 22, 23)
|
|
resistor_values = [0.005]
|
|
labels = ['PORT_0']
|
|
dev_config = DeviceConfig('Dev1', channel_map, resistor_values, 2.5, 0.2, 10000, len(resistor_values), labels)
|
|
if not len(sys.argv) == 3:
|
|
print 'Usage: {} OUTDIR DURATION'.format(os.path.basename(__file__))
|
|
sys.exit(1)
|
|
output_directory = sys.argv[1]
|
|
duration = float(sys.argv[2])
|
|
|
|
print "Avialable devices:", list_available_devices()
|
|
runner = DaqRunner(dev_config, output_directory)
|
|
runner.start()
|
|
time.sleep(duration)
|
|
runner.stop()
|