Source code for psychopy.hardware.minolta

#!/usr/bin/env python
# -*- coding: utf-8 -*-

# Part of the PsychoPy library
# Copyright (C) 2002-2018 Jonathan Peirce (C) 2019-2021 Open Science Tools Ltd.
# Distributed under the terms of the GNU General Public License (GPL).

"""Minolta light-measuring devices

from __future__ import absolute_import, print_function

from builtins import range
from builtins import object
from psychopy import logging
import struct
import sys
import time

    import serial
except ImportError:
    serial = False

[docs]class LS100(object): """A class to define a Minolta LS100 (or LS110?) photometer You need to connect a LS100 to the serial (RS232) port and **when you turn it on press the F key** on the device. This will put it into the correct mode to communicate with the serial port. usage:: from psychopy.hardware import minolta phot = minolta.LS100(port) if phot.OK: # then we successfully made a connection print(phot.getLum()) :parameters: port: string the serial port that should be checked maxAttempts: int If the device doesn't respond first time how many attempts should be made? If you're certain that this is the correct port and the device is on and correctly configured then this could be set high. If not then set this low. :troubleshooting: Various messages are printed to the log regarding the function of this device, but to see them you need to set the printing of the log to the correct level:: from psychopy import logging logging.console.setLevel(logging.ERROR) # error messages only logging.console.setLevel(logging.INFO) # more info logging.console.setLevel(logging.DEBUG) # log all communications If you're using a keyspan adapter (at least on macOS) be aware that it needs a driver installed. Otherwise no ports will be found. Error messages: ``ERROR: Couldn't connect to Minolta LS100/110 on ____``: This likely means that the device is not connected to that port (although the port has been found and opened). Check that the device has the `[` in the bottom right of the display; if not turn off and on again holding the `F` key. ``ERROR: No reply from LS100``: The port was found, the connection was made and an initial command worked, but then the device stopped communating. If the first measurement taken with the device after connecting does not yield a reasonable intensity the device can sulk (not a technical term!). The "[" on the display will disappear and you can no longer communicate with the device. Turn it off and on again (with F depressed) and use a reasonably bright screen for your first measurement. Subsequent measurements can be dark (or we really would be in trouble!!). """ longName = "Minolta LS100/LS110" driverFor = ["ls110", "ls100"] def __init__(self, port, maxAttempts=1): super(LS100, self).__init__() if not serial: raise ImportError("The module serial is needed to connect to " "photometers. On most systems this can be " "installed with\n\t easy_install pyserial") if type(port) in [int, float]: # add one so that port 1=COM1 self.portNumber = port self.portString = 'COM%i' % self.portNumber else: self.portString = port self.portNumber = None self.isOpen = 0 self.lastQual = 0 self.lastLum = None self.type = 'LS100' = False self.OK = True # until we fail self.maxAttempts = maxAttempts = { 'ER00\r\n': 'Unknown command', 'ER01\r\n': 'Setting error', 'ER11\r\n': 'Memory value error', 'ER10\r\n': 'Measuring range over', 'ER19\r\n': 'Display range over', 'ER20\r\n': 'EEPROM error (the photometer needs repair)', 'ER30\r\n': 'Photometer battery exhausted', } # try to open the port _linux = sys.platform.startswith('linux') if sys.platform in ('darwin', 'win32') or _linux: try: = serial.Serial(self.portString) except Exception: msg = ("Couldn't connect to port %s. Is it being used by " "another program?") self._error(msg % self.portString) else: msg = "I don't know how to handle serial ports on %s" self._error(msg % sys.platform) # setup the params for comms if self.OK: # not sure why this helps but on win32 it does!! # this is a slightly odd characteristic of the Minolta LS100 = 7 = 4800 = serial.PARITY_EVEN # none = serial.STOPBITS_TWO try: if not except Exception: msg = "Opened serial port %s, but couldn't connect to LS100" self._error(msg % self.portString) else: self.isOpen = 1 if self.OK: # we have an open com port. try to send a command for repN in range(self.maxAttempts): time.sleep(0.2) for n in range(10): # set to use absolute measurements reply = self.sendMessage(b'MDS,04') if reply[0:2] == 'OK': self.OK = True break elif reply not in self.OK = False break # wasn't valid else: self.OK = False # false so far but keep trying if self.OK: # we have successfully sent and read a command"Successfully opened %s" % self.portString)
[docs] def setMode(self, mode='04'): """Set the mode for measurements. Returns True (success) or False '04' means absolute measurements. '08' = peak '09' = cont See user manual for other modes """ reply = self.sendMessage(b'MDS,%s' % mode) return self.checkOK(reply)
[docs] def measure(self): """Measure the current luminance and set .lastLum to this value """ reply = self.sendMessage(b'MES') if self.checkOK(reply): lum = float(reply.split()[-1]) return lum else: return -1
[docs] def getLum(self): """Makes a measurement and returns the luminance value """ return self.measure()
[docs] def clearMemory(self): """Clear the memory of the device from previous measurements """ reply = self.sendMessage(b'CLE') ok = self.checkOK(reply) return ok
[docs] def checkOK(self, msg): """Check that the message from the photometer is OK. If there's an error show it (printed). Then return True (OK) or False. """ # also check that the reply is what was expected if msg[0:2] != 'OK': if msg == '': logging.error('No reply from LS100') sys.stdout.flush() else: logging.error('Error message from LS100:' +[msg]) sys.stdout.flush() return False else: return True
[docs] def sendMessage(self, message, timeout=5.0): """Send a command to the photometer and wait an allotted timeout for a response. """ if message[-2:] != '\r\n': message += '\r\n' # append a newline if necess # flush the read buffer first # read as many chars as are in the buffer'utf-8') for attemptN in range(self.maxAttempts): # send the message time.sleep(0.1) if type(message)!=bytes: message = message.decode('utf-8') time.sleep(0.1) # get reply (within timeout limit) = timeout # send complete message logging.debug('Sent command:' + message[:-2]) retVal ='utf-8') if len(retVal) > 0: break # we got a reply so can stop trying return retVal
def _error(self, msg): self.OK = False logging.error(msg)
[docs] def setMaxAttempts(self, maxAttempts): """Changes the number of attempts to send a message and read the output. Typically this should be low initially, if you aren't sure that the device is setup correctly but then, after the first successful reading, set it higher. """ self.maxAttempts = maxAttempts

Back to top