def run(self):
'''
Code to execute immediately prior to the beginning of the task FSM executing, or after the FSM has finished running.
See riglib.experiment.Experiment.run(). This 'run' method stops the NIDAQ sink after the FSM has finished running
'''
try:
super(RelayBlackrock, self).run()
finally:
self.nidaq.stop()
# Remotely stop the recording on the blackrock box
import comedi
import config
import time
com = comedi.comedi_open("/dev/comedi0")
time.sleep(0.5)
# strobe pin should already be low
# set last data pin ("D15"; 16th pin) low
comedi.comedi_dio_bitfield2(com, 0, 1, 0, 15)
# set strobe pin high
comedi.comedi_dio_bitfield2(com, 0, 1, 1, 16)
# set strobe pin low
comedi.comedi_dio_bitfield2(com, 0, 1, 0, 16)
def run(self):
'''
Code to execute immediately prior to the beginning of the task FSM executing, or after the FSM has finished running.
See riglib.experiment.Experiment.run(). This 'run' method stops the NIDAQ sink after the FSM has finished running
'''
try:
super(RelayBlackrock, self).run()
finally:
self.nidaq.stop()
# Remotely stop the recording on the blackrock box
import comedi
import config
import time
com = comedi.comedi_open("/dev/comedi0")
time.sleep(0.5)
# strobe pin should already be low
# set last data pin ("D15"; 16th pin) low
comedi.comedi_dio_bitfield2(com, 0, 1, 0, 15)
# set strobe pin high
comedi.comedi_dio_bitfield2(com, 0, 1, 1, 16)
# set strobe pin low
comedi.comedi_dio_bitfield2(com, 0, 1, 0, 16)
def measure(self,arange,aref,num_scans):
device = _comedi.comedi_open(comedidev)
if not device:
raise Exception('error opening Comedi device {}'.format(
comedidev))
setup_read_insn = SetupReadInsn(
subdevice=subdevice, channel=channel,
aref=aref, range=arange, n_scan=num_scans)
insns = setup_insns(
device, [setup_gtod_insn, setup_read_insn, setup_gtod_insn])
ret = _comedi.comedi_do_insnlist(device, insns)
if ret != insns.n_insns:
raise Exception('error running instructions ({})'.format(ret))
ret = _comedi.comedi_close(device)
if ret != 0:
raise Exception('error closing Comedi device')
array = _comedi.insn_array.frompointer(insns.insns)
t1 = get_time_of_day(array[0])
t2 = get_time_of_day(array[2])
data = _comedi.lsampl_array.frompointer(array[1].data)
vals = []
for i in range(array[1].n):
vals.append(data[i])
#sig=str((sum(vals) / float(len(vals))))
sig=float(median(vals))
free_insns(insns)
ret = _comedi.comedi_close(device)
return(sig)
def cleanup(self, database, saveid, **kwargs):
'''
Function to run at 'cleanup' time, after the FSM has finished executing. See riglib.experiment.Experiment.cleanup
This 'cleanup' method remotely stops the plexon file recording and then links the file created to the database ID for the current TaskEntry
'''
# Stop recording
import comedi
import config
import time
com = comedi.comedi_open("/dev/comedi0")
comedi.comedi_dio_bitfield2(com, 0, 16, 16, 16)
super(RelayPlexon, self).cleanup(database, saveid, **kwargs)
# Sleep time so that the plx file has time to save cleanly
time.sleep(2)
dbname = kwargs['dbname'] if 'dbname' in kwargs else 'default'
if self.plexfile is not None:
if dbname == 'default':
database.save_data(self.plexfile, "plexon", saveid, True, False)
else:
database.save_data(self.plexfile, "plexon", saveid, True, False, dbname=dbname)
else:
print '\n\nPlexon file not found properly! It will have to be manually linked!\n\n'
def open(self):
"""Starts commmunication with the device, must be called before any
set_cmd or get_data"""
self.device = c.comedi_open(self.device_name)
for chan in self.channels:
chan['maxdata'] = c.comedi_get_maxdata(self.device, self.subdevice,
chan['num'])
chan['range_ds'] = c.comedi_get_range(self.device, self.subdevice,
chan['num'],
chan['range_num'])
for chan in self.out_channels:
chan['maxdata'] = c.comedi_get_maxdata(self.device,
self.out_subdevice,
chan['num'])
chan['range_ds'] = c.comedi_get_range(self.device,
self.out_subdevice,
chan['num'],
chan['range_num'])
c.comedi_dio_config(self.device, 2, chan['num'], 1)
c.comedi_dio_write(self.device, 2, chan['num'], 1)
if any([i['make_zero'] for i in self.channels]):
off = self.eval_offset()
for i, chan in enumerate(self.channels):
if chan['make_zero']:
chan['offset'] += off[i]
def __init__(self, device="/dev/comedi0", subdevice=1, channel=0, range_num=0, gain=1, offset=0):
"""Convert wanted tension value into digital values and send it to the
output of some Comedi-controlled card.
Output is (command * gain) + offset.
Parameters
----------
device : str, default = '/dev/comedi0'
Path to the device.
subdevice : int, default = 1
Subdevice 1 is the output.
channel : int, default = 0
The desired output channel.
range_num : int, default = 0
See the comedi documentation for different values.
gain : float, default = 1
Multiplication gain for the output.
offset : float, default = 0
Add this value to your output.
"""
self.subdevice = 1 # delete as argument
self.channel = channel
self.range_num = range_num
self.gain = gain
self.offset = offset
self.device = c.comedi_open(device)
self.maxdata = c.comedi_get_maxdata(self.device, self.subdevice, self.channel)
self.range_ds = c.comedi_get_range(self.device, self.subdevice, self.channel, self.range_num)
c.comedi_dio_config(self.device, 2, self.channel, 1)
class stimulus_pulse(object):
com = comedi.comedi_open('/dev/comedi0')
def __init__(self, *args, **kwargs):
#self.com = comedi.comedi_open('/dev/comedi0')
super(stimulus_pulse, self).__init__(*args, **kwargs)
subdevice = 0
write_mask = 0x800000
val = 0x000000
base_channel = 0
comedi.comedi_dio_bitfield2(self.com, subdevice, write_mask, val,
base_channel)
def pulse(self, ts):
#super(stimulus_pulse, self).pulse()
subdevice = 0
write_mask = 0x800000
val = 0x000000
base_channel = 0
while ts < 0.4:
val = 0x800000
comedi.comedi_dio_bitfield2(self.com, subdevice, write_mask, val,
base_channel)
else:
val = 0x000000
comedi.comedi_dio_bitfield2(self.com, subdevice, write_mask, val,
base_channel)
def __init__(self,
K=1,
Ki=0,
Kd=0,
device='/dev/comedi0',
subdevice=1,
channel=0,
range_num=1,
gain=1,
offset=0,
out_min=0,
out_max=4.095):
self.subdevice = subdevice
self.channel = channel
self.range_num = range_num
self.device0 = c.comedi_open(device)
self.maxdata = c.comedi_get_maxdata(self.device0, self.subdevice,
self.channel)
self.range_ds = c.comedi_get_range(self.device0, self.subdevice,
self.channel, self.range_num)
self.out = 0
self.gain = gain
self.offset = offset
self.I_term = 0
self.last_sensor_input = 0
self.K = K
self.Ki = Ki
self.Kd = Kd
self.last_time = time.time()
self.out_min = out_min
self.out_max = out_max
self.last_output = 0
def cleanup(self, database, saveid, **kwargs):
'''
Function to run at 'cleanup' time, after the FSM has finished executing. See riglib.experiment.Experiment.cleanup
This 'cleanup' method remotely stops the plexon file recording and then links the file created to the database ID for the current TaskEntry
'''
# Stop recording
import comedi
import time
com = comedi.comedi_open("/dev/comedi0")
comedi.comedi_dio_bitfield2(com, 0, 16, 16, 16)
super(RelayPlexon, self).cleanup(database, saveid, **kwargs)
# Sleep time so that the plx file has time to save cleanly
time.sleep(2)
dbname = kwargs['dbname'] if 'dbname' in kwargs else 'default'
if self.plexfile is not None:
if dbname == 'default':
database.save_data(self.plexfile, "plexon", saveid, True,
False)
else:
database.save_data(self.plexfile,
"plexon",
saveid,
True,
False,
dbname=dbname)
else:
print(
'\n\nPlexon file not found properly! It will have to be manually linked!\n\n'
)
def imagecapture_part(xb, yb, xe, ye, nx, ny, n):
dev = comedi.comedi_open("/dev/comedi0")
outsubdevice = 1
insubdevice = 0
xchannel = 0
ychannel = 1
inchannel = 0
analogref = comedi.AREF_GROUND
arange = 0
image = numpy.zeros((nx,ny), float)
for y in range(ny, 0, -1):
y = y-1
write_data = int( (float(y)/(ny-1) *(ye-yb) + yb ) * 65535)
msg = comedi.comedi_data_write(dev, outsubdevice, ychannel, arange, analogref, write_data)
for x in range(0, nx):
# print "( " + str(x) + ", " + str(y) + ")"
write_data = int( (float(x)/(nx-1) * (xe-xb) + xb ) * 65535)
msg = comedi.comedi_data_write(dev, outsubdevice, xchannel, arange, analogref, write_data)
pixel = 0.0
for i in range(0, n):
result = comedi.comedi_data_read(dev,insubdevice,inchannel,arange,analogref)
pixel = pixel + float(result[1])
pixel = pixel/n
# print pixel,
msg=result[0]
image[x][y] = pixel
print
comedi.comedi_close(dev)
return image
def __init__(self, subdevice = c.COMEDI_SUBD_AI):
self.device = c.comedi_open('/dev/comedi0')
self.subdevice = c.comedi_find_subdevice_by_type(self.device, subdevice, 0)
self.numChannels = c.comedi_get_n_channels(self.device, self.subdevice)
self.numRanges = c.comedi_get_n_channels(self.device, self.subdevice)
self.channelRange = c.comedi_get_range(self.device, self.subdevice, 0, 0)
self.maxdata = c.comedi_get_maxdata(self.device, 0, 0)
def getimage(nx, ny, n):
dev = comedi.comedi_open("/dev/comedi0")
outsubdevice = 1
insubdevice = 0
xchannel = 0
ychannel = 1
inchannel = 0
analogref = comedi.AREF_GROUND
arange = 0
image = numpy.zeros((nx,ny), float)
for y in range(0, ny):
write_data = int( (float(y)/(ny-1) ) * 65535)
msg = comedi.comedi_data_write(dev, outsubdevice, ychannel, arange, analogref, write_data)
for x in range(0, nx):
write_data = int( (float(x)/(nx-1) ) * 65535)
msg = comedi.comedi_data_write(dev, outsubdevice, xchannel, arange, analogref, write_data)
pixel = 0.0
for i in range(0, n):
result = comedi.comedi_data_read(dev,insubdevice,inchannel,arange,analogref)
pixel = pixel + float(result[1])
pixel = pixel/n
# print pixel,
msg=result[0]
image[x][y] = pixel
# print
comedi.comedi_close(dev)
return pixel
def __init__(self, subdevice=c.COMEDI_SUBD_AI):
self.device = c.comedi_open('/dev/comedi0')
self.subdevice = c.comedi_find_subdevice_by_type(
self.device, subdevice, 0)
self.numChannels = c.comedi_get_n_channels(self.device, self.subdevice)
self.numRanges = c.comedi_get_n_channels(self.device, self.subdevice)
self.channelRange = c.comedi_get_range(self.device, self.subdevice, 0,
0)
self.maxdata = c.comedi_get_maxdata(self.device, 0, 0)
def __init__(self,device='/dev/comedi0',subdevice=0,channel=1,range_num=0,gain=1,offset=0): self.subdevice=subdevice self.channel=channel self.range_num=range_num self.device0=c.comedi_open(device) self.maxdata=c.comedi_get_maxdata(self.device0,self.subdevice,self.channel) self.range_ds=c.comedi_get_range(self.device0,self.subdevice,self.channel,self.range_num) self.gain=gain self.offset=offset
def __init__(self,dev_file='/dev/comedi0',**kw):
if not 'comedi' in globals().keys():
raise RuntimeError("Comedi input/output not supported on this platform.")
VisionEgg.Daq.Device.__init__(self,**kw)
self.dev = comedi.comedi_open(dev_file)
if not self.dev:
raise RuntimeError("Error openning Comedi device")
for channel in self.channels:
if not isinstance(channel,ComediChannel):
raise ValueError("ComediDevice only has ComediChannel.")
def get_dio_channels(path):
device = c.comedi_open(path)
n_subdevices = c.comedi_get_n_subdevices(device)
dio_list = []
for n_subdevice in range(n_subdevices):
if (c.comedi_get_subdevice_type(
device, n_subdevice) == comedi_subdevice_type("dio")):
n_channel = c.comedi_get_n_channels(device, n_subdevice)
#dio_list.extend([DioSocket(path, n_subdevice, chan)
# for chan in range(n_channel)])
return dio_list
def get_dio_channels(path):
device = c.comedi_open(path)
n_subdevices = c.comedi_get_n_subdevices(device)
dio_list = []
for n_subdevice in range(n_subdevices):
if (c.comedi_get_subdevice_type(device, n_subdevice)
== comedi_subdevice_type("dio")):
n_channel = c.comedi_get_n_channels(device, n_subdevice)
#dio_list.extend([DioSocket(path, n_subdevice, chan)
# for chan in range(n_channel)])
return dio_list
def setx(voltage):
dev = comedi.comedi_open("/dev/comedi0")
outsubdevice = 1
insubdevice = 0
xchannel = 0
ychannel = 1
inchannel = 0
analogref = comedi.AREF_GROUND
arange = 0
write_data = int( (float(voltage)+10)/20*65535)
msg = comedi.comedi_data_write(dev, outsubdevice, xchannel, arange, analogref, write_data)
comedi.comedi_close(dev)
def __init__(self):
# Open device
self.device = comedi.comedi_open('/dev/comedi0')
# Set max values as numbers
comedi.comedi_set_global_oor_behavior(comedi.COMEDI_OOR_NUMBER)
# Get channel range info
self.range_info_input_1 = comedi.comedi_get_range(self.device, 0 , 0 , 0)
self.range_info_input_2 = comedi.comedi_get_range(self.device, 0 , 1 , 0)
self.range_info_output_1 = comedi.comedi_get_range(self.device, 1 , 0 , 0)
# Get channel max inputs
self.maxdata_input_1 = comedi.comedi_get_maxdata(self.device,0 ,0)
self.maxdata_input_2 = comedi.comedi_get_maxdata(self.device,0 ,1)
self.maxdata_output_1 = comedi.comedi_get_maxdata(self.device,1 ,0)
self.lock = threading.Lock()
def init(self):
self.c_con = c.comedi_open('/dev/comedi0')
if self.c_con == None:
return 0
status = 0
for i in range(8):
status |= c.dio_config(self.c_con, channel.PORT_1_SUBDEVICE, i + channel.PORT_1_CHANNEL_OFFSET, channel.PORT_1_DIRECTION)
status |= c.dio_config(self.c_con, channel.PORT_2_SUBDEVICE, i + channel.PORT_2_CHANNEL_OFFSET, channel.PORT_2_DIRECTION)
status |= c.dio_config(self.c_con, channel.PORT_3_SUBDEVICE, i + channel.PORT_3_CHANNEL_OFFSET, channel.PORT_3_DIRECTION)
status |= c.dio_config(self.c_con, channel.PORT_4_SUBDEVICE, i + channel.PORT_4_CHANNEL_OFFSET, channel.PORT_4_DIRECTION)
return status == 0
def setup_adc(self):
self.subdevice=0 #Always the case here
self.dev = c.comedi_open('/dev/comedi0')
if not self.dev:
self.logger.error("Error openning Comedi device")
return -1
self.file_device = c.comedi_fileno(self.dev)
if not self.file_device:
self.logger.error("Error obtaining Comedi device file descriptor")
return -1
self.buffer_size = c.comedi_get_buffer_size(self.dev, self.subdevice)
temp_msg = "Debug size: %i" % self.buffer_size
self.logger.info(temp_msg)
self.map = mmap.mmap(self.file_device,self.buffer_size,mmap.MAP_SHARED, mmap.PROT_READ)
def diowrite(subdevice, channel, data):
dev = comedi.comedi_open("/dev/comedi0")
ret1 = comedi.comedi_dio_config(dev, subdevice, channel, comedi.COMEDI_OUTPUT)
if ret1 == 1:
pass
else:
print "initialisation failed"
ret=comedi.comedi_dio_write(dev, subdevice, channel, data)
if ret == 1:
pass
else:
print "setting failed"
comedi.comedi_close(dev)
def SetComediDevice():
if os.path.isfile("/proc/comedi"):
device = "/dev/comedi0"
try:
dev = comedi.comedi_open(device)
global insubdevice
insubdevice = comedi.comedi_get_read_subdevice(dev)
# print "subdevice for input = " + str(insubdevice)
global outsubdevice
outsubdevice = comedi.comedi_get_write_subdevice(dev)
# print "subdevice for output = " + str(outsubdevice)
return "/dev/comedi0"
except:
print "cannot open /dev/comedi0, permissions?"
else:
return ""
def run(self):
'''
Code to execute immediately prior to the beginning of the task FSM executing, or after the FSM has finished running.
See riglib.experiment.Experiment.run(). This 'run' method stops the NIDAQ sink after the FSM has stopped running.
'''
try:
super(RelayPlexon, self).run()
finally:
# Stop the NIDAQ sink
self.nidaq.stop()
# Remotely stop the recording on the plexon box
import comedi
import time
com = comedi.comedi_open("/dev/comedi0")
time.sleep(0.5)
comedi.comedi_dio_bitfield2(com, 0, 16, 16, 16)
def pre_init(cls, saveid=None):
'''
Run prior to starting the task to remotely start recording from the plexon system
'''
if saveid is not None:
import comedi
import time
com = comedi.comedi_open("/dev/comedi0")
# stop any recording
comedi.comedi_dio_bitfield2(com, 0, 16, 16, 16)
time.sleep(0.1)
# start recording
comedi.comedi_dio_bitfield2(com, 0, 16, 0, 16)
time.sleep(3)
super(RelayPlexon, cls).pre_init(saveid=saveid)
def __init__(self, path, serialNum="FT24092", comediNum=0):
#The defaults are configured for the Linux computer by the MTMs
#The other force sensor is serialNum="FT24093", comedi_num=1
self.num_channels = 6
self.sub_device = 0
self.aref = 0 # = AREF_GROUND
self.range = 0 #0 = [-10V, 10V]
#Create a comedi connection for connected device
self.dev = comedi.comedi_open("/dev/comedi" + str(comediNum))
#Read in calibration matrix
self.cal_matrix = self.read_cal_file(path + "/calibration/" +
serialNum + ".cal")
self.bias = self.findBias()
print("Created sensor " + serialNum + " on port " + str(comediNum) +
"\n")
def __init__(self,
device='/dev/comedi0',
subdevice=0,
channel=1,
range_num=0,
gain=1,
offset=0):
self.subdevice = subdevice
self.channel = channel
self.range_num = range_num
self.device0 = c.comedi_open(device)
self.maxdata = c.comedi_get_maxdata(self.device0, self.subdevice,
self.channel)
self.range_ds = c.comedi_get_range(self.device0, self.subdevice,
self.channel, self.range_num)
self.gain = gain
self.offset = offset
def open_dev(devname):
#open a comedi device
sys.stdout.write("NICOMEDI: Opening comedi subdevice... ")
sys.stdout.flush()
dev=c.comedi_open(devname)
name = c.comedi_get_board_name(dev)
if not dev:
comedi_errcheck()
sys.stdout.write("found %s\n" % (name))
sys.stdout.flush()
#get a file-descriptor for use later
fd = c.comedi_fileno(dev)
if fd == -1:
comedi_errcheck()
return dev, fd, name
def __init__(self, *args, **kwargs):
'''
Constructor for TTLReward
Parameters
----------
pulse_device: string
Path to the NIDAQ device used to generate the solenoid pulse
args, kwargs: optional positional and keyword arguments to be passed to parent constructor
None necessary
Returns
-------
TTLReward instance
'''
import comedi
self.com = comedi.comedi_open('/dev/comedi0')
super(TTLReward, self).__init__(*args, **kwargs)
def open_dev(devname):
#open a comedi device
sys.stdout.write("NICOMEDI: Opening comedi subdevice... ")
sys.stdout.flush()
dev = c.comedi_open(devname)
name = c.comedi_get_board_name(dev)
if not dev:
comedi_errcheck()
sys.stdout.write("found %s\n" % (name))
sys.stdout.flush()
#get a file-descriptor for use later
fd = c.comedi_fileno(dev)
if fd == -1:
comedi_errcheck()
return dev, fd, name
def pre_init(cls, saveid=None):
'''
Run prior to starting the task to remotely start recording from the plexon system
'''
if saveid is not None:
import comedi
import config
import time
com = comedi.comedi_open("/dev/comedi0")
# stop any recording
comedi.comedi_dio_bitfield2(com, 0, 16, 16, 16)
time.sleep(0.1)
# start recording
comedi.comedi_dio_bitfield2(com, 0, 16, 0, 16)
time.sleep(3)
super(RelayPlexon, cls).pre_init(saveid=saveid)
def run(self):
'''
Code to execute immediately prior to the beginning of the task FSM executing, or after the FSM has finished running.
See riglib.experiment.Experiment.run(). This 'run' method stops the NIDAQ sink after the FSM has stopped running.
'''
try:
super(RelayPlexon, self).run()
finally:
# Stop the NIDAQ sink
self.nidaq.stop()
# Remotely stop the recording on the plexon box
import comedi
import config
import time
com = comedi.comedi_open("/dev/comedi0")
time.sleep(0.5)
comedi.comedi_dio_bitfield2(com, 0, 16, 16, 16)
def __init__(self,K=1,Ki=0,Kd=0,device='/dev/comedi0',subdevice=1,channel=0,range_num=1,gain=1,offset=0,out_min=0,out_max=4.095): self.subdevice=subdevice self.channel=channel self.range_num=range_num self.device0=c.comedi_open(device) self.maxdata=c.comedi_get_maxdata(self.device0,self.subdevice,self.channel) self.range_ds=c.comedi_get_range(self.device0,self.subdevice,self.channel,self.range_num) self.out=0 self.gain=gain self.offset=offset self.I_term=0 self.last_sensor_input=0 self.K=K self.Ki=Ki self.Kd=Kd self.last_time=time.time() self.out_min=out_min self.out_max=out_max self.last_output=0
def __init__(self,device='/dev/comedi0',subdevice=0,channels=0,
range_num=0,gain=1,offset=0):
"""
Convert tension value into digital values, on several channels.
Output is (measured_value * gain) + offset.
Parameters
----------
device : str, default = '/dev/comedi0'
Path to the device.
subdevice : int, default = 0
Subdevice 0 is the intput.
channel : int or list of int, default = 0
The desired output channel(s).
range_num : int, default = 0
See the comedi documentation for different values.
gain : float or list of float, default = 1
Multiplication gain for each channel. If there is multiple channels
for a single gain, it will be applied to all.
offset : float, default = 0
Add this value for each channel. If there is multiple channels
for a single offset, it will be applied to all.
"""
self.subdevice=subdevice
self.channels=channels
self.range_num=range_num
self.gain=gain
self.offset=offset
self.device=c.comedi_open(device)
#if type(self.channels)==int or len(self.channels)==1: # for getData
#self.nchans=1
if type(self.channels)==list: # if multiple channels
self.nchans=len(self.channels)
self.range_num=[self.range_num]*self.nchans
if type(self.gain)==int:
self.gain=[self.gain]*self.nchans
if type(self.offset)==int:
self.offset=[self.offset]*self.nchans
self.new()
else:
raise Exception("channels must be int or list")
def pre_init(cls, saveid=None):
if saveid is not None:
import comedi
import config
import time
com = comedi.comedi_open("/dev/comedi0")
# set strobe pin low
comedi.comedi_dio_bitfield2(com, 0, 1, 0, 16)
# set last data pin ("D15"; 16th pin) high
comedi.comedi_dio_bitfield2(com, 0, 1, 1, 15)
# set strobe pin high
comedi.comedi_dio_bitfield2(com, 0, 1, 1, 16)
# set strobe pin low
comedi.comedi_dio_bitfield2(com, 0, 1, 0, 16)
time.sleep(3)
super(RelayPlexon, cls).pre_init(saveid=saveid)
def pre_init(cls, saveid=None):
if saveid is not None:
import comedi
import config
import time
com = comedi.comedi_open("/dev/comedi0")
# set strobe pin low
comedi.comedi_dio_bitfield2(com, 0, 1, 0, 16)
# set last data pin ("D15"; 16th pin) high
comedi.comedi_dio_bitfield2(com, 0, 1, 1, 15)
# set strobe pin high
comedi.comedi_dio_bitfield2(com, 0, 1, 1, 16)
# set strobe pin low
comedi.comedi_dio_bitfield2(com, 0, 1, 0, 16)
time.sleep(3)
super(RelayPlexon, cls).pre_init(saveid=saveid)
def init(self):
self.c_con = c.comedi_open('/dev/comedi0')
if self.c_con == None:
return 0
status = 0
for i in range(8):
status |= c.dio_config(self.c_con, channel.PORT_1_SUBDEVICE,
i + channel.PORT_1_CHANNEL_OFFSET,
channel.PORT_1_DIRECTION)
status |= c.dio_config(self.c_con, channel.PORT_2_SUBDEVICE,
i + channel.PORT_2_CHANNEL_OFFSET,
channel.PORT_2_DIRECTION)
status |= c.dio_config(self.c_con, channel.PORT_3_SUBDEVICE,
i + channel.PORT_3_CHANNEL_OFFSET,
channel.PORT_3_DIRECTION)
status |= c.dio_config(self.c_con, channel.PORT_4_SUBDEVICE,
i + channel.PORT_4_CHANNEL_OFFSET,
channel.PORT_4_DIRECTION)
return status == 0
def _phys_channel(context):
"""Comedi uses device names such as /dev/comedi0 SUBDEVICE CHANNEL
where SUBDEVICE and CHANNEL are integers.
In the config file, we must set /dev/comedi0 as the port and
SUBDEVICE.CHANNEL as the node.
.. code-block:: yaml
daq:
/dev/comedi0:
- node: 1.1
name: dio1
- node: 1.2
name: dio2
"""
filename = context.path[0].device
subdevice, channel = context.node.split(".")
device = c.comedi_open(filename)
if not device:
raise ComediError("Failed to open device %s" % filename)
return device, int(subdevice), int(channel)
def _phys_channel(context):
"""Comedi uses device names such as /dev/comedi0 SUBDEVICE CHANNEL
where SUBDEVICE and CHANNEL are integers.
In the config file, we must set /dev/comedi0 as the port and
SUBDEVICE.CHANNEL as the node.
.. code-block:: yaml
daq:
/dev/comedi0:
- node: 1.1
name: dio1
- node: 1.2
name: dio2
"""
filename = context.path[0].device
subdevice, channel = context.node.split(".")
device = c.comedi_open(filename)
if not device:
raise ComediError("Failed to open device %s" % filename)
return device, int(subdevice), int(channel)
def timedbeamunblank(delay):
dev = comedi.comedi_open("/dev/comedi0")
subdevice = 2
channel = 0
data = 0
ret1 = comedi.comedi_dio_config(dev, subdevice, channel, comedi.COMEDI_OUTPUT)
if ret1 == 1:
pass
else:
print "initialisation failed"
start_time = datetime.datetime.now()
ret=comedi.comedi_dio_write(dev, subdevice, channel, data)
blanked_time = datetime.datetime.now()
if ret == 1:
pass
else:
print "setting failed"
time.sleep(delay)
data = 1
ret=comedi.comedi_dio_write(dev, subdevice, channel, data)
end_time = datetime.datetime.now()
print "blanked_time =", blanked_time - start_time
print "end_time =", end_time - start_time
if ret == 1:
pass
else:
print "setting failed"
comedi.comedi_close(dev)
# comedi_combo_test.py
import comedi as c
import time
channel = 0
comediDevice = c.comedi_open('/dev/comedi0')
print comediDevice
print "***** HANDLING INPUT DEVICE(S) *****"
inputSubdev = c.comedi_find_subdevice_by_type(comediDevice, c.COMEDI_SUBD_AI, 0)
print "input subdevice: %d" % inputSubdev
inputMaxdata = c.comedi_get_maxdata(comediDevice, inputSubdev, channel)
print "Input max Data: %d" % inputMaxdata
nInputChannels = c.comedi_get_n_channels(comediDevice, inputSubdev)
print "Num input Channels: %d" % nInputChannels
nInputRanges = c.comedi_get_n_ranges(comediDevice, inputSubdev, channel)
print "number Input Ranges: %d" % nInputRanges
inputRange = c.comedi_get_range(comediDevice, inputSubdev, channel, 0)
print "input range: : %s" % str(inputRange)
print "Input locked? %d" % c.comedi_lock(comediDevice, inputSubdev)
print "***** HANDLING OUTPUT DEVICE(S) *****"
return insns
def free_insns(insns):
array = _comedi.insn_array.frompointer(insns.insns)
array.thisown = True
for i in range(insns.n_insns):
insn = array[i]
data = _comedi.lsampl_array.frompointer(insn.data)
data.thisown = True
if True:
fname = '/dev/comedi0'
device = _comedi.comedi_open(fname)
if not device:
raise Exception('error opening Comedi device {}'.format(fname))
subdevice = 0
channel = 2
aref = 'ground'
rng = 0
n_scan = 1
if True:
setup_read_insn = SetupReadInsn(subdevice=subdevice,
channel=channel,
aref=aref,
range=rng,
def acquire_data(config):
"""
Acquire data from data acquisition device.
"""
#Open a comedi device
dev = c.comedi_open(config['device'])
if not dev:
err_msg = "%s: error: unable to open openning Comedi device" % (
PROG_NAME, )
sys.stderr.write(err_msg)
sys.exit(1)
# Get a file-descriptor to access data
fd = c.comedi_fileno(dev)
# Setup channels
nchans = len(config['channels'])
aref_str = config['aref'].lower()
if aref_str == 'diff':
aref = [c.AREF_DIFF] * nchans
elif aref_str == 'common':
aref = [c.AREF_COMMON] * nchans
elif aref_str == 'ground':
aref = [c.AREF_GROUND] * nchans
else:
raise ValueError, 'unknown aref'
#nchans = len(config['channels'])
#aref =[c.AREF_GROUND]*nchans
# Pack the channel, gain and reference information into the chanlist object
channel_list = c.chanlist(nchans)
for i in range(nchans):
channel_list[i] = c.cr_pack(config['channels'][i], config['gains'][i],
aref[i])
# Construct a comedi command
cmd = c.comedi_cmd_struct()
cmd.subdev = config['subdev']
cmd.flags = DEFAULT_CMD_FLAGS
cmd.start_src = c.TRIG_NOW
cmd.sart_arg = DEFAULT_CMD_SART_ARG
cmd.scan_begin_src = c.TRIG_TIMER
cmd.scan_begin_arg = int(NANO_SEC / config['sample_freq'])
cmd.convert_src = c.TRIG_TIMER
cmd.convert_arg = DEFAULT_CMD_CONVERT_ARG
cmd.scan_end_src = c.TRIG_COUNT
cmd.scan_end_arg = nchans
cmd.stop_src = c.TRIG_COUNT
cmd.stop_arg = config['sample_num']
cmd.chanlist = channel_list
cmd.chanlist_len = nchans
# Test comedi command
if config['verbose']:
print 'Testing comedi command'
print
for i in range(0, DEFAULT_CMD_TEST_NUM):
if config['verbose']:
print_cmd(cmd)
ret = c.comedi_command_test(dev, cmd)
if config['verbose']:
print
print '\t*** test %d returns %s' % (i, CMD_TEST_MSG[ret])
print
if not ret == 0:
msg_data = (PROG_NAME, CMD_TEST_MSG[ret])
err_msg = '%s: error: unable to configure daq device - %s' % msg_data
sys.stderr.write(err_msg)
# Acquire data
if config['verbose']:
print 'acquiring data'
print
sys.stdout.flush()
ret = c.comedi_command(dev, cmd) # non blocking
if not ret == 0:
err_msg = '%s: error: unable to execute comedi command' % (PROG_NAME, )
sys.stderr.write(err_msg)
sys.exit(1)
# Read data from buffer - may want to add a timeout here
read_done = False
bytes_total = 2 * config['sample_num'] * nchans
bytes_read = 0
datastr = ''
while not read_done:
try:
buffstr = os.read(fd, bytes_total)
except OSError, err:
if err.args[0] == 4:
continue
raise
datastr += buffstr
bytes_read += len(buffstr)
if config['verbose']:
print '\tread:', bytes_read, 'of', 2 * config[
'sample_num'] * nchans, 'bytes'
if bytes_read == bytes_total:
read_done = True
c.COMEDI_SUBD_UNUSED: "unused",
c.COMEDI_SUBD_AI: "analog input",
c.COMEDI_SUBD_AO: "analog output",
c.COMEDI_SUBD_DI: "digital input",
c.COMEDI_SUBD_DO: "digital output",
c.COMEDI_SUBD_DIO: "digital I/O",
c.COMEDI_SUBD_COUNTER: "counter",
c.COMEDI_SUBD_SERIAL: "serial",
c.COMEDI_SUBD_PWM: "pulse width modulation",
c.COMEDI_SUBD_TIMER: "timer",
c.COMEDI_SUBD_MEMORY: "memory",
c.COMEDI_SUBD_CALIB: "calibration",
c.COMEDI_SUBD_PROC: "processor"
}
#open a comedi device
dev = c.comedi_open('/dev/comedi0')
if not dev: raise "Error openning Comedi device"
version_code = c.comedi_get_version_code(dev)
if not version_code: raise "Error reading version_code"
print "version code is: ", version_code
driver_name = c.comedi_get_driver_name(dev)
if not driver_name: raise "Error reading driver_name"
print "driver name is: ", driver_name
board_name = c.comedi_get_board_name(dev)
if not board_name: raise "Error reading board_name"
print "board name is: ", board_name
n_subdevices = c.comedi_get_n_subdevices(dev)
#!/usr/bin/python
#set the paths so python can find the comedi module
import sys, os, string, struct, time, mmap, array
import comedi as c
import numpy
#open a comedi device
dev=c.comedi_open('/dev/comedi0')
device = dev
if not dev:
raise "Error openning Comedi device"
#get a file-descriptor for use later
fd = c.comedi_fileno(dev)
if fd<=0:
raise "Error obtaining Comedi device file descriptor"
freq=50000 # as defined in demo/common.c
subdevice=0 #as defined in demo/common.c
secs = 3 # used to stop scan after "secs" seconds
packetSize = 512
#three lists containing the chans, gains and referencing
#the lists must all have the same length
#~ chans=[0,1,2,3]
#~ gains=[0,0,0,0]
#~ aref =[c.AREF_GROUND, c.AREF_GROUND, c.AREF_GROUND, c.AREF_GROUND]
#nchans = 16
nchans = 2
def open(self):
self.device = comedi.comedi_open(self.device_name)
if self.device is None:
raise InterfaceError('could not open comedi device %s' %
self.device_name)
import comedi
import time
com = comedi.comedi_open("/dev/comedi0")
time.sleep(0.010)
print "starting file recording"
comedi.comedi_dio_bitfield2(com,0,16,0,16)
print "Sleeping for 10 seconds"
import time
time.sleep(10)
print "Stopping file recording"
comedi.comedi_dio_bitfield2(com, 0, 16, 16, 16)
# The maximum value we display for the final forces
FORCE_MAXREADING = 5
N_FORCES = 6
dumpf = open('dump.txt', 'w')
import math
import numpy as np
sens_to_f = np.genfromtxt('sensor_transf_matrix_FT4714.csv', delimiter=',')
# read the matrix that transforms sensor data into force data.
# note: the columns here are the sensor dimensions, the rows are the force dimensions.
#open a comedi device
dev = c.comedi_open(DEVICE)
if not dev: raise Exception("Error opening Comedi device")
# get maxdata & range
# - these values are used to convert integer to physical values
i = SUBDEVICE
maxdata = c.comedi_get_maxdata(dev, SUBDEVICE, 0)
#print("\tmax data value: %d" % (maxdata))
ranges = []
#n_ranges = c.comedi_get_n_ranges(dev,i,0)
#print("\t\tall chans:")
n_ranges = c.comedi_get_n_ranges(dev, SUBDEVICE,
0) # get how many range options we have
class TTLStimulation(object):
'''During the stimulation phase, send a timed TTL pulse to the Master-8 stimulator'''
hold_time = float(1)
stimulation_pulse_length = float(0.2 * 1e6)
stimulation_frequency = float(3)
status = dict(pulse=dict(pulse_end="interpulse_period", stop=None),
interpulse_period=dict(another_pulse="pulse",
pulse_train_end="pulse_off",
stop=None),
pulse_off=dict(stop=None))
com = comedi.comedi_open('/dev/comedi0')
pulse_count = 0 #initializing number of pulses that have occured
def __init__(self, *args, **kwargs):
super(TTLStimulation, self).__init__(*args, **kwargs)
number_of_pulses = int(
self.hold_time * self.stimulation_frequency
) # total pulses during a stimulation pulse train, assumes hold_time is in s
def init(self):
super(TTLStimulation, self).init()
#### TEST FUNCTIONS ####
def _test_pulse_end(self, ts):
#return true if time has been longer than the specified pulse duration
pulse_length = self.stimulation_pulse_length * 1e-6 # assumes stimulation_pulse_length is in us
return ts >= pulse_length
def _test_another_pulse(self, ts):
interpulse_time = (
1 / self.stimulationfrequency
) - self.stimulation_pulse_length * 1e-6 # period minus the duration of a pulse
return ts >= interpulse_time
def _test_pulse_train_end(self, ts):
return (
self.pulse_count > number_of_pulses
) # end train if number of pulses is completed or if the animal ends holding early
#### STATE FUNCTIONS ####
def _start_pulse(self):
'''
At the start of the stimulation state, send TTL pulse
'''
#super(TTLStimulation, self)._start_pulse()
subdevice = 0
write_mask = 0x800000
val = 0x800000
base_channel = 0
comedi.comedi_dio_bitfield2(self.com, subdevice, write_mask, val,
base_channel)
self.pulse_count = self.pulse_count + 1
#self.stimulation_start = self.get_time() - self.start_time
def _end_pulse(self):
subdevice = 0
write_mask = 0x800000
val = 0x000000
base_channel = 0
comedi.comedi_dio_bitfield2(self.com, subdevice, write_mask, val,
base_channel)
def _start_interpulse_period(self):
super(TTLStimulation, self)._start_interpulse_period()
subdevice = 0
write_mask = 0x800000
val = 0x000000
base_channel = 0
comedi.comedi_dio_bitfield2(self.com, subdevice, write_mask, val,
base_channel)
def _end_interpulse_period(self):
super(TTLStimulation, self)._end_interpulse_period()
subdevice = 0
write_mask = 0x800000
val = 0x000000
base_channel = 0
comedi.comedi_dio_bitfield2(self.com, subdevice, write_mask, val,
base_channel)
#curses.nocbreak()
stdscr.keypad(0)
curses.echo()
stdscr.nodelay(1)
gin = stdscr.getch()
# -------------------------------------------------------------------------
# --------- DAQ initialization
# -------------------------------------------------------------------------
chans = [0,1]
subdev = 0
chrange = 0
# Open and configure device
daq = comedi.comedi_open('/dev/comedi0')
if not daq:
raise "Error openning Comedi device"
maxdata = [0,0]
cr = [0,0]
maxdata[0] = comedi.comedi_get_maxdata(daq,subdev, chans[0])
cr[0] = comedi.comedi_get_range(daq,subdev,chans[0],chrange)
maxdata[1] = comedi.comedi_get_maxdata(daq,subdev, chans[1])
cr[1] = comedi.comedi_get_range(daq,subdev,chans[1],chrange)
# -------------------------------------------------------------------------
# --------- polarizer initialization
# -------------------------------------------------------------------------
NUM_TEETH_PASSIVE_GEAR = 80.0 # number of teeth on gear surrounding polarizer
LOG.setLevel(_logging.DEBUG)
elif args.verbose >= 2:
LOG.setLevel(_logging.INFO)
elif args.verbose >= 1:
LOG.setLevel(_logging.WARN)
if args.num_scans > MAX_SAMPLES:
LOG.warn(
'requested too many samples, reducing to {}'.format(MAX_SAMPLES))
args.num_scans = MAX_SAMPLES
LOG.info(('measuring device={0.filename} subdevice={0.subdevice} '
'channel={0.channel} range={0.range} analog reference={0.aref}'
).format(args))
device = _comedi.comedi_open(args.filename)
if not device:
raise Exception('error opening Comedi device {}'.format(args.filename))
setup_read_insn = SetupReadInsn(subdevice=args.subdevice,
channel=args.channel,
aref=args.aref,
range=args.range,
n_scan=args.num_scans)
insns = setup_insns(device,
[setup_gtod_insn, setup_read_insn, setup_gtod_insn])
ret = _comedi.comedi_do_insnlist(device, insns)
if ret != insns.n_insns:
raise Exception('error running instructions ({})'.format(ret))
def main():
# Find comedi analog device number
try:
with open(COMEDI_PROC_F) as f:
#print(f)
for line in f.readlines():
m_analog = re.match(PCI_6033E_PATTERN, line)
m_digital = re.match(PCI_DIO_32HS_PATTERN, line)
if m_analog:
print(m_analog.group())
dev_number = m_analog.groups()[0]
analog_dev_fname = "/dev/comedi" + dev_number
if m_digital:
print(m_digital.group())
dev_number = m_digital.groups()[0]
digital_dev_fname = "/dev/comedi" + dev_number
except IOError:
print("Could not find file: %s" % COMEDI_PROC_F)
if (f):
f.close()
if (analog_dev_fname):
analog_dev = c.comedi_open(analog_dev_fname)
if not(analog_dev):
print("Unable to open analog comedi device...")
ret = c.comedi_lock(analog_dev, 0)
if (ret < 0):
print("Could not lock comedi device")
ret = c.comedi_get_max_buffer_size(analog_dev, 0)
if (ret > 0):
print("analog max buffer size: %i" % ret)
else:
print("Failed to get analog dev max buffer size...")
ret = c.comedi_set_max_buffer_size(analog_dev, 0, MAX_BUFFER_SIZE)
if (ret > 0):
print("analog dev new buffer size: %i" % ret)
else:
print("Failed to analog dev set max buffer size...")
c.comedi_close(analog_dev)
if (digital_dev_fname):
digital_dev = c.comedi_open(digital_dev_fname)
if not(digital_dev):
print("Unable to open digital comedi device...")
ret = c.comedi_lock(digital_dev, 0)
if (ret < 0):
print("Could not lock digital comedi device")
ret = c.comedi_get_max_buffer_size(digital_dev, 0)
if (ret > 0):
print("analog max buffer size: %i" % ret)
else:
print("Failed to get digital dev max buffer size...")
ret = c.comedi_set_max_buffer_size(digital_dev, 0, MAX_BUFFER_SIZE)
if (ret > 0):
print("digital dev new buffer size: %i" % ret)
else:
print("Failed to digital dev set max buffer size...")
c.comedi_close(digital_dev)
def streamer(device,subdevice,chans,comedi_range,shared_array):
''' read the channels defined in chans, on the device/subdevice, and streams the values in the shared_array.
The shared_array has a lock, to avoid reading and writing at the same time and it's process-proof.
device: '/dev/comedi0'
subdevice : 0=in, 1=out
chans : [0,1,2,3,4....] : BE AWARE the reading is done crescendo, no matter the order given here. It means that [0,1,2] and [2,0,1] will both have [0,1,2] as result, but you can ask for [0,1,5].
comedi_range: same size as chans, with the proper range for each chan. If unknown, try [0,0,0,....].
shared_array: same size as chans, must be defined before with multiprocess.Array: shared_array= Array('f', np.arange(len(chans)))
'''
dev=c.comedi_open(device)
if not dev: raise "Error openning Comedi device"
fd = c.comedi_fileno(dev) #get a file-descriptor for use later
BUFSZ = 10000 #buffer size
freq=8000# acquisition frequency: if too high, set frequency to maximum.
nchans = len(chans) #number of channels
aref =[c.AREF_GROUND]*nchans
mylist = c.chanlist(nchans) #create a chanlist of length nchans
maxdata=[0]*(nchans)
range_ds=[0]*(nchans)
for index in range(nchans): #pack the channel, gain and reference information into the chanlist object
mylist[index]=c.cr_pack(chans[index], comedi_range[index], aref[index])
maxdata[index]=c.comedi_get_maxdata(dev,subdevice,chans[index])
range_ds[index]=c.comedi_get_range(dev,subdevice,chans[index],comedi_range[index])
cmd = c.comedi_cmd_struct()
period = int(1.0e9/freq) # in nanoseconds
ret = c.comedi_get_cmd_generic_timed(dev,subdevice,cmd,nchans,period)
if ret: raise "Error comedi_get_cmd_generic failed"
cmd.chanlist = mylist # adjust for our particular context
cmd.chanlist_len = nchans
cmd.scan_end_arg = nchans
cmd.stop_arg=0
cmd.stop_src=c.TRIG_NONE
t0 = time.time()
j=0
ret = c.comedi_command(dev,cmd)
if ret !=0: raise "comedi_command failed..."
#Lines below are for initializing the format, depending on the comedi-card.
data = os.read(fd,BUFSZ) # read buffer and returns binary data
data_length=len(data)
#print maxdata
#print data_length
if maxdata[0]<=65536: # case for usb-dux-D
n = data_length/2 # 2 bytes per 'H'
format = `n`+'H'
elif maxdata[0]>65536: #case for usb-dux-sigma
n = data_length/4 # 2 bytes per 'H'
format = `n`+'I'
#print struct.unpack(format,data)
# init is over, start acquisition and stream
last_t=time.time()
try:
while True:
#t_now=time.time()
#while (t_now-last_t)<(1./frequency):
#t_now=time.time()
##print t_now-last_t
#last_t=t_now
data = os.read(fd,BUFSZ) # read buffer and returns binary data
#print len(data), data_length
if len(data)==data_length:
datastr = struct.unpack(format,data) # convert binary data to digital value
if len(datastr)==nchans: #if data not corrupted for some reason
#shared_array.acquire()
for i in range(nchans):
shared_array[i]=c.comedi_to_phys((datastr[i]),range_ds[i],maxdata[i])
#print datastr
#shared_array.release()
#j+=1
#print j
#print "Frequency= ",(j/(time.time()-t0))
#print np.transpose(shared_array[:])
except (KeyboardInterrupt):
c.comedi_cancel(dev,subdevice)
ret = c.comedi_close(dev)
if ret !=0: raise "comedi_close failed..."
import comedi
import time
com = comedi.comedi_open("/dev/comedi0")
for i in range(6):
# set strobe pin low
comedi.comedi_dio_bitfield2(com, 0, 1, 0, 16)
time.sleep(1)
# set strobe pin high
comedi.comedi_dio_bitfield2(com, 0, 1, 1, 16)
time.sleep(1)
def __init__(self):
self.device = comedi.comedi_open(DEVICE_FILENAME)
if not self.device:
raise Exception("Cannot open device")
self.initialize()
def streamer(device, subdevice, chans, comedi_range, shared_array):
''' read the channels defined in chans, on the device/subdevice, and streams the values in the shared_array.
The shared_array has a lock, to avoid reading and writing at the same time and it's process-proof.
device: '/dev/comedi0'
subdevice : 0=in, 1=out
chans : [0,1,2,3,4....] : BE AWARE the reading is done crescendo, no matter the order given here. It means that [0,1,2] and [2,0,1] will both have [0,1,2] as result, but you can ask for [0,1,5].
comedi_range: same size as chans, with the proper range for each chan. If unknown, try [0,0,0,....].
shared_array: same size as chans, must be defined before with multiprocess.Array: shared_array= Array('f', np.arange(len(chans)))
'''
dev = c.comedi_open(device)
if not dev: raise "Error openning Comedi device"
fd = c.comedi_fileno(dev) #get a file-descriptor for use later
BUFSZ = 10000 #buffer size
freq = 8000 # acquisition frequency: if too high, set frequency to maximum.
nchans = len(chans) #number of channels
aref = [c.AREF_GROUND] * nchans
mylist = c.chanlist(nchans) #create a chanlist of length nchans
maxdata = [0] * (nchans)
range_ds = [0] * (nchans)
for index in range(
nchans
): #pack the channel, gain and reference information into the chanlist object
mylist[index] = c.cr_pack(chans[index], comedi_range[index],
aref[index])
maxdata[index] = c.comedi_get_maxdata(dev, subdevice, chans[index])
range_ds[index] = c.comedi_get_range(dev, subdevice, chans[index],
comedi_range[index])
cmd = c.comedi_cmd_struct()
period = int(1.0e9 / freq) # in nanoseconds
ret = c.comedi_get_cmd_generic_timed(dev, subdevice, cmd, nchans, period)
if ret: raise "Error comedi_get_cmd_generic failed"
cmd.chanlist = mylist # adjust for our particular context
cmd.chanlist_len = nchans
cmd.scan_end_arg = nchans
cmd.stop_arg = 0
cmd.stop_src = c.TRIG_NONE
t0 = time.time()
j = 0
ret = c.comedi_command(dev, cmd)
if ret != 0: raise "comedi_command failed..."
#Lines below are for initializing the format, depending on the comedi-card.
data = os.read(fd, BUFSZ) # read buffer and returns binary data
data_length = len(data)
#print maxdata
#print data_length
if maxdata[0] <= 65536: # case for usb-dux-D
n = data_length / 2 # 2 bytes per 'H'
format = ` n ` + 'H'
elif maxdata[0] > 65536: #case for usb-dux-sigma
n = data_length / 4 # 2 bytes per 'H'
format = ` n ` + 'I'
#print struct.unpack(format,data)
# init is over, start acquisition and stream
last_t = time.time()
try:
while True:
#t_now=time.time()
#while (t_now-last_t)<(1./frequency):
#t_now=time.time()
##print t_now-last_t
#last_t=t_now
data = os.read(fd, BUFSZ) # read buffer and returns binary data
#print len(data), data_length
if len(data) == data_length:
datastr = struct.unpack(
format, data) # convert binary data to digital value
if len(datastr
) == nchans: #if data not corrupted for some reason
#shared_array.acquire()
for i in range(nchans):
shared_array[i] = c.comedi_to_phys(
(datastr[i]), range_ds[i], maxdata[i])
#print datastr
#shared_array.release()
#j+=1
#print j
#print "Frequency= ",(j/(time.time()-t0))
#print np.transpose(shared_array[:])
except (KeyboardInterrupt):
c.comedi_cancel(dev, subdevice)
ret = c.comedi_close(dev)
if ret != 0: raise "comedi_close failed..."