--- a/prologix.py Mon Feb 04 19:49:48 2008 +0100
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,117 +0,0 @@
-"""
-prologix
-========
-
-Module defining a communication object to talk to Prologix USB-GPIB controler.
-
-"""
-import serial
-import time
-
-import pygpib
-from pygpib import ConnectionError
-
-GPIB_CONTROLLER = 1
-GPIB_DEVICE = 0
-
-class GPIB(object):
- _retries = 15
- def __init__(self, device="/dev/ttyUSB0", baudrate=115200, timeout=0.1,
- address=0, mode=1):
- """
- Create a new GPIB controller for the Prologix USB-GPIB device
- located on serial device 'device'.
- """
- self._cnx = serial.Serial(port=device, baudrate=baudrate, timeout=timeout)
- self._timeout = timeout
-
- self.set_mode(mode)
- self.set_address(address)
-
- def set_address(self, address):
- """
- Set the address of the GPIB device:
-
- - if the device is the Controller In Charge, this is the
- address of the device commands are sent to,
-
- - if the device is in GPIB_DEVICE mode, this is its address.
- """
- self._set_cmd('addr', address)
- self._adress = address
-
- def set_mode(self, mode):
- """
- Set GPIB device mode to 'mode':
-
- - GPIB_CONTROLLER: set the device as the Controller In Charge
- on the GPIB bus
-
- - GPIB_DEVICE: set the device as a standard GPIB device on the
- bus.
- """
- self._set_cmd('mode', mode)
- self._mode = mode
-
- def set_controller(self):
- """
- Set GPIB device the Controller In Charge on the GPIB bus.
- """
- self.set_mode(1)
-
- def set_device(self):
- """
- Set the GPIB device as a simple device on the GPIB bus.
- """
- self.set_mode(0)
-
- def send_command(self, cmd):
- """
- Send the specified GPIB command on the bus (must be the CIC),
- and read the answer.
- """
- assert self._mode == 1
- self._cnx.write(cmd+'\r')
- time.sleep(self._timeout) # required?
- ret = self._cnx.readlines()
- return ''.join(ret)
-
- def check_srq(self):
- """
- Check the SRQ line
- """
- assert self._mode == 1, "must be the Controller In Charge"
- self._cnx.write('++srq\r')
- ret = self._cnx.readline().strip()
- if ret:
- return bool(int(ret))
- return None
-
- def poll(self):
- """
- Poll every address, and return a dictionnary
- {add: status, ...}
- """
- assert self._mode == 1, "must be the Controller In Charge"
- dico = {}
- for add in range(31):
- self._cnx.write('++spoll %d\r'%i)
- ret = self._cnx.readline().strip()
- if ret:
- dico[i] = int(ret)
- return dico
-
- def _read(self):
- for i in range(self._retries):
- rdata = self._cnx.readline()
- if rdata.strip() != "":
- break
- time.sleep(self._timeout)
- return rdata
-
- def _set_cmd(self, cmd, value):
- self._cnx.write('++%s %d\r'%(cmd, value))
- self._cnx.write('++%s\r'%(cmd))
- rval = self._read().strip()
- if not rval.isdigit() or int(rval) != value:
- raise ConnectionError("Can't set GPIB %s to %s [ret=%s]"%(cmd, value, repr(rval)))