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#pyparallel driver for win32
#see __init__.py
#
#(C) 2002 Chris Liechti <cliechti@gmx.net>
# this is distributed under a free software license, see license.txt
#
# thanks to Dincer Aydin dinceraydin@altavista.net for his work on the
# winioport module: www.geocities.com/dinceraydin/ the graphic below is
# borrowed form him ;-)
# LPT1 = 0x0378 or 0x03BC
# LPT2 = 0x0278 or 0x0378
# LPT3 = 0x0278
#
# Data Register (base + 0) ........ outputs
#
# 7 6 5 4 3 2 1 0
# . . . . . . . * D0 ........... (pin 2), 1=High, 0=Low (true)
# . . . . . . * . D1 ........... (pin 3), 1=High, 0=Low (true)
# . . . . . * . . D2 ........... (pin 4), 1=High, 0=Low (true)
# . . . . * . . . D3 ........... (pin 5), 1=High, 0=Low (true)
# . . . * . . . . D4 ........... (pin 6), 1=High, 0=Low (true)
# . . * . . . . . D5 ........... (pin 7), 1=High, 0=Low (true)
# . * . . . . . . D6 ........... (pin 8), 1=High, 0=Low (true)
# * . . . . . . . D7 ........... (pin 9), 1=High, 0=Low (true)
#
# Status Register (base + 1) ...... inputs
#
# 7 6 5 4 3 2 1 0
# . . . . . * * * Undefined
# . . . . * . . . Error ........ (pin 15), high=1, low=0 (true)
# . . . * . . . . Selected ..... (pin 13), high=1, low=0 (true)
# . . * . . . . . No paper ..... (pin 12), high=1, low=0 (true)
# . * . . . . . . Ack .......... (pin 10), high=1, low=0 (true)
# * . . . . . . . Busy ......... (pin 11), high=0, low=1 (inverted)
#
# ctrl Register (base + 2) ..... outputs
#
# 7 6 5 4 3 2 1 0
# . . . . . . . * Strobe ....... (pin 1), 1=low, 0=high (inverted)
# . . . . . . * . Auto Feed .... (pin 14), 1=low, 0=high (inverted)
# . . . . . * . . Initialize ... (pin 16), 1=high,0=low (true)
# . . . . * . . . Select ....... (pin 17), 1=low, 0=high (inverted)
# * * * * . . . . Unused
LPT1 = 0
LPT2 = 1
LPT1_base = 0x0378
LPT2_base = 0x0278
import ctypes
import os
#need to patch PATH so that the DLL can be found and loaded
os.environ['PATH'] = os.environ['PATH'] + ';' + os.path.abspath(os.path.dirname(__file__))
#fake module, names of the functions are the same as in the old _pyparallel
#python extension in earlier versions of this modules
_pyparallel = ctypes.windll.simpleio
#need to initialize giveio on WinNT based systems
if _pyparallel.init():
raise IOError('Could not access the giveio driver which is required on NT based systems.')
class Parallel:
def __init__(self, port = LPT1):
if port == LPT1:
self.dataRegAdr = LPT1_base
elif port == LPT2:
self.dataRegAdr = LPT2_base
else:
raise ValueError("No such port available - expecting a number")
self.statusRegAdr = self.dataRegAdr + 1
self.ctrlRegAdr = self.dataRegAdr + 2
self.ctrlReg = _pyparallel.inp(self.ctrlRegAdr)
def setData(self, value):
_pyparallel.outp(self.dataRegAdr, value)
# control register output functions
def setDataStrobe(self, level):
"""data strobe bit"""
if level:
self.ctrlReg = self.ctrlReg & ~0x01
else:
self.ctrlReg = self.ctrlReg | 0x01
_pyparallel.outp(self.ctrlRegAdr, self.ctrlReg)
def setAutoFeed(self, level):
"""auto feed bit"""
if level:
self.ctrlReg = self.ctrlReg & ~0x02
else:
self.ctrlReg = self.ctrlReg | 0x02
_pyparallel.outp(self.ctrlRegAdr, self.ctrlReg)
def setInitOut(self, level):
"""initialize bit"""
if level:
self.ctrlReg = self.ctrlReg | 0x04
else:
self.ctrlReg = self.ctrlReg & ~0x04
_pyparallel.outp(self.ctrlRegAdr, self.ctrlReg)
def setSelect(self, level):
"""select bit"""
if level:
self.ctrlReg = self.ctrlReg & ~0x08
else:
self.ctrlReg = self.ctrlReg | 0x08
_pyparallel.outp(self.ctrlRegAdr, self.ctrlReg)
def getInError(self):
"""Error pin"""
return _pyparallel.inp(self.statusRegAdr) & 0x08 and 1
def getInSelected(self):
"""select pin"""
return _pyparallel.inp(self.statusRegAdr) & 0x10 and 1
def getInPaperOut(self):
"""paper out pin"""
return _pyparallel.inp(self.statusRegAdr) & 0x20 and 1
def getInAcknowledge(self):
"""Acknowledge pin"""
return _pyparallel.inp(self.statusRegAdr) & 0x40 and 1
def getInBusy(self):
"""input from busy pin"""
return not (_pyparallel.inp(self.statusRegAdr) & 0x80)
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