prologix.py

Fri, 25 Jan 2008 21:01:30 +0100

author
David Douard <david.douard@logilab.fr>
date
Fri, 25 Jan 2008 21:01:30 +0100
changeset 33
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parent 14
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child 35
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permissions
-rw-r--r--

added some hpgl example plots

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1 """
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2 prologix
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3 ========
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4
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5 Module defining a communication object to talk to Prologix USB-GPIB controler.
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7 """
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8 import serial
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9 import time
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10
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11 import gpib
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12 from gpib import ConnectionError
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14 GPIB_CONTROLLER = 1
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15 GPIB_DEVICE = 0
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16
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17 class GPIB(object):
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18 _retries = 15
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19 def __init__(self, device="/dev/ttyUSB0", baudrate=115200, timeout=0.1,
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20 address=0, mode=1):
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21 """
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22 Create a new GPIB controller for the Prologix USB-GPIB device
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23 located on serial device 'device'.
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24 """
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25 self._cnx = serial.Serial(port=device, baudrate=baudrate, timeout=timeout)
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26 self._timeout = timeout
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27
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28 self.set_mode(mode)
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29 self.set_address(address)
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30
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31 def set_address(self, address):
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32 """
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33 Set the address of the GPIB device:
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34
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35 - if the device is the Controller In Charge, this is the
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36 address of the device commands are sent to,
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37
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38 - if the device is in GPIB_DEVICE mode, this is its address.
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39 """
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40 self._set_cmd('addr', address)
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41 self._adress = address
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42
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43 def set_mode(self, mode):
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44 """
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45 Set GPIB device mode to 'mode':
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46
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47 - GPIB_CONTROLLER: set the device as the Controller In Charge
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48 on the GPIB bus
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49
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50 - GPIB_DEVICE: set the device as a standard GPIB device on the
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51 bus.
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52 """
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53 self._set_cmd('mode', mode)
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54 self._mode = mode
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55
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56 def set_controller(self):
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57 """
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58 Set GPIB device the Controller In Charge on the GPIB bus.
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59 """
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60 self.set_mode(1)
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61
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62 def set_device(self):
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63 """
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64 Set the GPIB device as a simple device on the GPIB bus.
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65 """
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66 self.set_mode(0)
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67
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68 def send_command(self, cmd):
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69 """
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70 Send the specified GPIB command on the bus (must be the CIC),
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71 and read the answer.
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72 """
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73 assert self._mode == 1
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74 self._cnx.write(cmd+'\r')
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75 time.sleep(self._timeout) # required?
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76 ret = self._cnx.readlines()
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77 return ''.join(ret)
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78
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79 def check_srq(self):
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80 """
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81 Check the SRQ line
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82 """
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83 assert self._mode == 1, "must be the Controller In Charge"
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84 self._cnx.write('++srq\r')
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85 ret = self._cnx.readline().strip()
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86 if ret:
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87 return bool(int(ret))
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88 return None
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89
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90 def poll(self):
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91 """
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92 Poll every address, and return a dictionnary
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93 {add: status, ...}
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94 """
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95 assert self._mode == 1, "must be the Controller In Charge"
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96 dico = {}
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97 for add in range(31):
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98 self._cnx.write('++spoll %d\r'%i)
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99 ret = self._cnx.readline().strip()
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100 if ret:
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101 dico[i] = int(ret)
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102 return dico
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103
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104 def _read(self):
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105 for i in range(self._retries):
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106 rdata = self._cnx.readline()
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107 if rdata.strip() != "":
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108 break
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109 time.sleep(self._timeout)
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110 return rdata
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111
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112 def _set_cmd(self, cmd, value):
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113 self._cnx.write('++%s %d\r'%(cmd, value))
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114 self._cnx.write('++%s\r'%(cmd))
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115 rval = self._read().strip()
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116 if not rval.isdigit() or int(rval) != value:
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117 raise ConnectionError("Can't set GPIB %s to %s [ret=%s]"%(cmd, value, repr(rval)))

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