Exemplo n.º 1
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':
Exemplo n.º 2
0
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)
Exemplo n.º 3
0
    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)
Exemplo n.º 4
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':
Exemplo n.º 5
0
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