import comedi as c
dev = c.comedi_open('/dev/comedi0')
print dev
maxdata = c.comedi_get_maxdata(dev, 0, 0)
print "Max Data: %d" % maxdata
subdev = c.comedi_find_subdevice_by_type(dev, c.COMEDI_SUBD_AO, 0)
print "Subdevice: %d" % subdev
print "Locked? %d" % c.comedi_lock(dev, subdev)
nChannels = c.comedi_get_n_channels(dev, subdev)
print "Num Channels: %d" % nChannels
crange = c.comedi_get_range(dev, 0, 0, 0)
print "Range: %s" % str(crange)
data = maxdata/2
# start with no speed
c.comedi_data_write(dev, subdev, 0, 0, 0, data)
while True:
usrin = raw_input("Enter a char: ")
if usrin is 'q':
break
elif usrin is 'o':
data = data + 10
elif usrin is 'l':
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 pci_6033e_init(self, dev_name):
self.dev = c.comedi_open(dev_name)
if not(self.dev):
self.warn_dialog("Unable to open device: " + dev_name)
return(-1)
ret = c.comedi_lock(self.dev, SUBDEVICE)
if (ret < 0):
self.warn_dialog("Could not lock comedi device")
return(-1)
# get a file-descriptor for use later
self.fd = c.comedi_fileno(self.dev)
if (self.fd <= 0):
self.warn_dialog("Error obtaining Comedi device file descriptor")
c.comedi_close(self.dev)
return(-1)
# Channel range (0-5V)
if (c.comedi_range_is_chan_specific(self.dev, SUBDEVICE) != 0):
self.warn_dialog("Comedi range is channel specific!")
c.comedi_close(self.dev)
return(-1)
self.comedi_range = c.comedi_get_range(self.dev, SUBDEVICE, 0, CHAN_RANGE)
self.comedi_maxdata = c.comedi_get_maxdata(self.dev, SUBDEVICE, 0)
board_name = c.comedi_get_board_name(self.dev)
if (board_name != "pci-6033e"):
print("Opened wrong device!")
# Prepare channels, gains, refs
self.comedi_num_chans = NUM_CHANNELS
chans = range(self.comedi_num_chans)
gains = [0]*self.comedi_num_chans
aref = [c.AREF_GROUND]*self.comedi_num_chans
chan_list = c.chanlist(self.comedi_num_chans)
# Configure all the channels!
for i in range(self.comedi_num_chans):
chan_list[i] = c.cr_pack(chans[i], gains[i], aref[i])
# The comedi command
self.cmd = c.comedi_cmd_struct()
# 1.0e9 because this number is in nanoseconds for some reason
period = int(1.0e9/float(SCAN_FREQ))
# Init cmd
ret = c.comedi_get_cmd_generic_timed(self.dev, SUBDEVICE, self.cmd, self.comedi_num_chans, period)
if (ret):
self.warn_dialog("Could not initiate command")
c.comedi_close(self.dev)
return(-1)
# Populate command
self.cmd.chanlist = chan_list
self.cmd.chanlist_len = self.comedi_num_chans
self.cmd.scan_end_arg = self.comedi_num_chans
self.cmd.stop_src = c.TRIG_NONE
self.cmd.stop_arg = 0
print("real timing: %d ns" % self.cmd.convert_arg)
print("Real scan freq: %d Hz" % (1.0/(float(self.cmd.convert_arg)*32.0*1.0e-9)))
#print("period: %d ns" % period)
print_cmd(self.cmd)
# Test command out.
ret = c.comedi_command_test(self.dev, self.cmd)
if (ret < 0):
self.warn_dialog("Comedi command test failed!")
c.comedi_close(self.dev)
return(-1)
print("Command test passed")
return(0)
import comedi as c
dev = c.comedi_open('/dev/comedi0')
print dev
maxdata = c.comedi_get_maxdata(dev, 0, 0)
print "Max Data: %d" % maxdata
subdev = c.comedi_find_subdevice_by_type(dev, c.COMEDI_SUBD_AO, 0)
print "Subdevice: %d" % subdev
print "Locked? %d" % c.comedi_lock(dev, subdev)
nChannels = c.comedi_get_n_channels(dev, subdev)
print "Num Channels: %d" % nChannels
crange = c.comedi_get_range(dev, 0, 0, 0)
print "Range: %s" % str(crange)
data = maxdata / 2
# start with no speed
c.comedi_data_write(dev, subdev, 0, 0, 0, data)
while True:
usrin = raw_input("Enter a char: ")
if usrin is 'q':
break
elif usrin is 'o':
data = data + 10
elif usrin is 'l':
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) *****" outputSubdev = c.comedi_find_subdevice_by_type(comediDevice, c.COMEDI_SUBD_AO, 0) print "output subdevice: %d" % outputSubdev outputMaxdata = c.comedi_get_maxdata(comediDevice, outputSubdev, channel) print "output max Data: %d" % outputMaxdata nOutputChannels = c.comedi_get_n_channels(comediDevice, outputSubdev) print "Num output Channels: %d" % nOutputChannels nOutputRanges = c.comedi_get_n_ranges(comediDevice, outputSubdev, channel) print "number output Ranges: %d" % nOutputRanges
