86 lines
2.4 KiB
Python
86 lines
2.4 KiB
Python
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##
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## **** Prologix_GPIB_USB Class ****
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##
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## A Device that emulates the functionality of the
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## Prologix GPIB-USB Controller (prologix.biz)
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##
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import Device, PTY_Interface
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class Prologix_GPIB_USB(Device.Device):
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##%% Initialization - Prologix_GPIB_USB()
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## Does not take arguments, but is VERY important
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## All classes that attempt to inherit this class,
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## must call this initialization.
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##
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## This creates a dictionary containing all the commands
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## to be run. If this dictionary is not created, this class
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## does nothing
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##
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def __init__(self):
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self.cmds = { "++ver":self.version, # "COMMAND":HANDLER
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"++addr":self.addr,
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"++kill":self.kill}
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##%% handleCMD(pty_interface, command, arguments)
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## See Device.handleCMD documentation
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##
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## In Prologix_GPIB_USB, this function makes use of the
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## map made in initialization to find the command and
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## its associated handler, then call the handler and pass in
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## the pty_interface and the arguments
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##
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def handleCMD(self, fpl, cmd, args=[]):
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out = Device.Device.handleCMD(self, fpl, cmd, args)
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if out != "":
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return out
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elif cmd in self.cmds:
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return self.cmds[cmd](fpl, args)
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else:
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return ""
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##%% version(pty, args)
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## Returns the device version
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##
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def version(self, fpl, args=[]):
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return "Prologix Version 1.1 Simulator (Python)"
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##%% addr(pty, args)
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## If no arguments are given, returns the current address
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## of the pty interface
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##
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## if args are given, then an integer is parsed out of
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## the first argument and set as the address. This ensures
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## that a device exists at the following address
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##
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## Any errors return "ERROR"
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##
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def addr(self, fpl, args=[]):
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if args == []:
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return str(fpl.addr)
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else:
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try:
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fpl.addr = int(args[0])
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if not fpl.addr in fpl.devices:
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fpl.addDevice(PrologixAdapter(), fpl.addr)
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return ""
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except:
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return "ERROR"
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##%% kill(pty, args)
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## Stops the pty interface from running
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##
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def kill(self, fpl, args=[]):
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fpl.running = False
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return ""
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##%% addCMD(command, handler_function)
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## Adds a command to the dictionary
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## Handler function must be of the form
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## func(pty_interface, arguments):
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##
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def addCMD(self, cmd, func):
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self.cmds[cmd] = func
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