psychopy.parallel- functions for interacting with the parallel port¶
This module provides read / write access to the parallel port for Linux or Windows.
Parallel class described below will
attempt to load whichever parallel port driver is first found on your
system and should suffice in most instances. If you need to use a specific
driver then, instead of using
shown below you can use one of the following as drop-in replacements,
forcing the use of a specific driver:
Either way, each instance of the class can provide access to a different parallel port.
There is also a legacy API which consists of the routines which are directly in this module. That API assumes you only ever want to use a single parallel port at once.
We would strongly recommend you use the class above instead: these are provided for backwards compatibility only.
Set the memory address or device node for your parallel port of your parallel port, to be used in subsequent commands
Common port addresses:
LPT1 = 0x0378 or 0x03BC LPT2 = 0x0278 or 0x0378 LPT3 = 0x0278
This routine will attempt to find a usable driver depending on your platform
Set the data to be presented on the parallel port (one ubyte).
Alternatively you can set the value of each pin (data pins are pins
2-9 inclusive) using
parallel.setData(0) # sets all pins low parallel.setData(255) # sets all pins high parallel.setData(2) # sets just pin 3 high (remember that pin2=bit0) parallel.setData(3) # sets just pins 2 and 3 high
You can also convert base 2 to int v easily in python:
parallel.setData(int("00000011", 2)) # pins 2 and 3 high parallel.setData(int("00000101", 2)) # pins 2 and 4 high
Set a desired pin to be high (1) or low (0).
Only pins 2-9 (incl) are normally used for data output:
parallel.setPin(3, 1) # sets pin 3 high parallel.setPin(3, 0) # sets pin 3 low
Determine whether a desired (input) pin is high(1) or low(0).
Pins 2-13 and 15 are currently read here