research/TCS/interface.py

   1 #!/usr/bin/python
   2
   3 # @file "interface.py"
   4 # @author Sam Moore
   5 # @purpose AVR Butterfly Datalogger control for Total Current Spectroscopy Measurements
   6 #       The AVR responds to a limited number of RS232 commands to read ADC channels and set the DAC
   7 #       This script can be used to control the DAC and monitor initial energy & sample current over RS232
   8
   9 import sys
  10 import os
  11 import time
  12 import serial
  13 import datetime
  14
  15 import odict
  16 import Gnuplot, Gnuplot.funcutils
  17 import subprocess
  18
  19 gnuplot = Gnuplot.Gnuplot()
  20
  21 # TODO: Insert variables for calibration purposes here.
  22 calibrate = {
  23         "ADC_Counts" : [2**10,2**10,2**10,2**10,2**10,2**10,2**10], # Maxed counts on ADC channels (10 bits = 2**10 = 1024)
  24         "DAC_Counts" : 2**12, # Maxed counts on DAC channel (12 bits = 2**12 = 4096)
  25
  26         # Calibration data for DAC and ADC
  27         "DAC" : None,
  28         "ADC" : [None, None, None, None, None, None, None, None],
  29
  30         # Data used for rough calibration if above data is not present
  31         "Vref" : 3.3, # The output of the voltage regulator (Vref = Vcc) relative to signal ground
  32         "ADC_Rin" : [None, None, None, None, 15000, 1100, 1100, 1100],
  33         "ADC_Rvar" : [None, None, None, None, 1000, 5000, 10000, 50000],
  34         "DAC_Gain" : 1
  35 }
  36
  37 # TODO: Adjust aqcuisition parameters here
  38 aquire = { "DAC_Sweep" : "0.0 + 10.0*int(step)", # DAC Sweep value (t is in STEPS, not seconds!)
  39         "ADC_Averages" : 200,
  40         #"ADC_Vi" : 5, # ADC channel to read back Vi (set by DAC) through
  41         #"ADC_Is" : 4, # ADC channel to read back Is through
  42         #"ADC_Ie" : 4, # ADC channel to read back Ie through
  43         "DAC_Settle" : 0.0, # Time in seconds to wait for DAC to stabilise
  44         #"response_wait" : 0.2, # Time to wait in seconds between sending data and reading back
  45         "start_date" : None,
  46         "open_files" : []
  47 }
  48
  49 #Setup the serial connection parameters
  50 ser = serial.Serial(
  51         port="/dev/ttyUSB1", # Modify as needed (note: in linux need to run `sudo chmod a+rw /dev/ttyUSBX' to set permissions)
  52
  53         # Do not change the values below here (unless AVR butterfly is reprogrammed to use different values)
  54         baudrate=4800,
  55         parity="N",
  56         stopbits=1,
  57         bytesize=8,
  58         timeout=None,
  59         xonxoff=0,
  60         rtscts=0
  61 )
  62 #Using an ordered dictionary, so results will be determined (or prompted for) in this order.
  63 # Put things that are being changed a lot near the top of the list.
  64 parameters = odict.odict([
  65         ("Chamber Pressure" , None), # Chamber pressure now automatically determined
  66         ("Venault Voltage" , None),
  67         ("Title" , None),
  68         ("Comment" , None),
  69         ("Accelerating Voltage" , None),
  70         ("Focus Voltage" , None),
  71         ("Deflection Voltage" , None),
  72         ("Initial Voltage" , None),
  73         ("Heating Current" , None),
  74         ("Heating Voltage (across filament)" , None),
  75         ("Heating Voltage (across power supply)", None),
  76         #("610B Zero" , None),
  77         ("602 Zero" , None),
  78         #("610B Scale" , None),
  79         ("602 Scale" , None),
  80         ("602 0.1 Battery" , None),
  81         ("602 0.03 Battery" , None),
  82         ("602 0.01 Battery" , None),
  83         ("602 0.003 Battery" , None),
  84         ("602 0.001 Battery" , None),
  85         ("ADC Regulator" , None),
  86         ("Sample", None),
  87         ("Sample Angle", None),
  88         ("Data" , None),
  89         ("Parameters last checked", None)
  90 ])
  91
  92 def getTime():
  93         return str(datetime.datetime.now()).split(" ")[1].split(".")[0].replace(":","")
  94
  95 def getDate():
  96         return str(datetime.datetime.now()).split(" ")[0]
  97
  98 def getPressure():
  99         p = subprocess.Popen("./pressure/get_pressure.sh", stdout=subprocess.PIPE)
 100         return float(p.stdout.readline().strip(" \r\n\t"))
 101
 102
 103 # Used for when I press Control-C to stop things
 104 def set_exit_handler(func):
 105     if os.name == "nt":
 106         try:
 107             import win32api
 108             win32api.SetConsoleCtrlHandler(func, True)
 109         except ImportError:
 110             version = ".".join(map(str, sys.version_info[:2]))
 111             raise Exception("pywin32 not installed for Python " + version)
 112     else:
 113         import signal
 114         signal.signal(signal.SIGTERM, func)
 115         signal.signal(signal.SIGINT, func)
 116
 117 def killed_handler(signal, frame):
 118         reason = ""
 119         sys.stdout.write("\n# Reason for killing program? ")
 120         reason = sys.stdin.readline().strip("\r\n ")
 121         for out in aquire["open_files"]:
 122                 sys.stdout.write("# Closing file " + str(out) + "\n")
 123                 out.write("# Recieved KILL signal.\n# Reason: " + str(reason) + "\n")
 124                 log_close(out)
 125
 126
 127
 128 def cleanup():
 129         for out in aquire["open_files"]:
 130                 out.write("# Program exits.\n")
 131                 log_close(out)
 132
 133 def log_open(a, b):
 134         result = open(a, b,0)
 135         if (b == "w"):
 136                 result.write("# File opened at " + str(datetime.datetime.now()) + "\n")
 137                 aquire["open_files"].append(result)
 138         return result
 139
 140 def log_close(afile):
 141         if (afile in aquire["open_files"]):
 142                 afile.write("# File closed at " + str(datetime.datetime.now()) + "\n")
 143                 aquire["open_files"].remove(afile)
 144
 145         afile.close()
 146
 147
 148 def init():
 149         #import atexit
 150         #atexit.register(cleanup)
 151         set_exit_handler(killed_handler)
 152
 153         aquire["start_date"] = getDate()
 154
 155
 156
 157         # Connect serial
 158         ser.open()
 159         ser.isOpen()
 160 #       print("Waiting for \"# hello\" from device...")
 161 #       while (ser.readline().strip("\r\n") != "# hello"):
 162 #               pass
 163         #while (ser.readline().strip("\r\n ") != "#"):
 164         #       pass
 165         #time.sleep(1.0)
 166
 167         ser.write("a "+str(aquire["ADC_Averages"]) + "\r\n")
 168         ser.readline().strip("\r\n")
 169         ser.readline().strip("\r\n")
 170         ser.readline().strip("\r\n")
 171         #print(ser.readline().strip("\r\n"))
 172         #print(ser.readline().strip("\r\n"))
 173         #print(ser.readline().strip("\r\n"))
 174
 175         #print("Writing config information to config.dat...")
 176         #output = log_open("config.dat", "w", 1)
 177
 178         #output.write("# Initialise " + str(datetime.datetime.now()) + "\n")
 179
 180         #for field in calibrate:
 181         #       output.write("# calibrate["+str(field)+"] = "+str(calibrate[field]) + "\n")
 182         #output.write("\n")
 183         #for field in aquire:
 184         #       output.write("# aquire["+str(field)+"] = "+str(aquire[field]) + "\n")
 185
 186         #output.write("# Ready " + str(datetime.datetime.now()) + "\n# EOF\n")
 187         #output.close()
 188
 189 def main():
 190
 191         init()
 192
 193         # I haven't ever used calibrated results, and yet this code is still here, why???
 194         #if (loadCalibration_DAC() == False):
 195         #       if (calibrateDAC() == False):
 196         #               return -1
 197         #if (loadCalibration_ADC(aquire["ADC_Is"]) == False):
 198         #       if (calibrateADC_usingDAC(aquire["ADC_Is"], False) == False):
 199         #               if (calibrateADC(aquire["ADC_Is"]) == False):
 200         #                       return -1
 201
 202         #if (loadCalibration_ADC(aquire["ADC_Vi"]) == False):
 203         #       if (calibrateADC_usingDAC(aquire["ADC_Vi"], True) == False):
 204         #               if (calibrateADC(aquire["ADC_Vi"]) == False):
 205         #                       return -1
 206
 207
 208         # Make directory for today, backup calibration files
 209         os.system("mkdir -p " + getDate())
 210         #os.system("cp *.dat " + getDate() +"/")
 211
 212         checkList()
 213
 214
 215
 216
 217
 218         # Experiment
 219         # TODO: Modify data to record here
 220         sweep = 1
 221         #for i in range(0,5):
 222         while True:
 223                 os.system("mkdir -p " + getDate())
 224                 record_data([5], getDate()+"/"+str(getTime())+".dat", None, 4001)
 225                 sweep += 1
 226         #setDAC(500)
 227
 228 def checkList():
 229         try:
 230                 input_file = log_open(getDate()+"/checklist", "r")
 231         except:
 232                 input_file = None
 233
 234         if (input_file != None):
 235                 for line in input_file:
 236                         k = line.split("=")
 237                         item = None
 238                         if (len(k) >= 2):
 239                                 item = k[0].strip("# \r\n")
 240                                 value = k[1].strip("# \r\n")
 241
 242                         if (item in parameters):
 243                                 if item == "Chamber Pressure":
 244                                         parameters[item] = getPressure()
 245                                 else:
 246                                         parameters[item] = value
 247
 248                 #print("Checklist found. Overwrite? [Y/n]")
 249                 response = "" #sys.stdin.readline().strip(" \r\n")
 250                 if (response == "" or response == "y" or response == "Y"):
 251                         input_file = log_open(getDate()+"/checklist.old", "w")
 252                         for item in parameters:
 253                                 input_file.write("# " + str(item) + " = " + str(parameters[item]) + "\n")
 254                         input_file.write("\n")
 255                         log_close(input_file)
 256                         input_file = None
 257
 258         if (input_file == None):
 259                 for item in parameters:
 260                         if item == "Parameters last checked":
 261                                 continue
 262                         if item == "Chamber Pressure":
 263                                 #sys.stdout.write("\""+str(item)+"\" = " + str(parameters[item]) + " - get new pressure... ")
 264                                 #parameters[item] = getPressure()
 265                                 #sys.stdout.write(str(parameters[item]) + "\n")
 266                                 continue
 267
 268                         sys.stdout.write("\""+str(item)+"\" = " + str(parameters[item]) + " New value?: ")
 269                         response = sys.stdin.readline().strip("\r\n ")
 270                         if (response == "!"):
 271                                 break
 272                         if (response != ""):
 273                                 parameters[item] = response
 274                         sys.stdout.write("\n")
 275                 parameters["Parameters last checked"] = str(datetime.datetime.now())
 276
 277
 278         checklist = log_open(getDate()+"/checklist", "w")
 279         for item in parameters:
 280                 checklist.write("# "+str(item) + " = " + str(parameters[item]) + "\n")
 281                 #output_file.write("# "+str(item) + " = " + str(parameters[item]) + "\n")
 282         log_close(checklist)
 283
 284
 285 def record_data(ADC_channels, output, pollTime = None, dac_max = None):
 286
 287         if (output != None):
 288                 gnuplot("set title \""+str(output)+"\"")
 289                 output = [log_open(output, "w"), sys.stdout]
 290
 291         else:
 292                 gnuplot("set title \"<No file>\"")
 293                 output = [sys.stdout]
 294
 295         for field in aquire:
 296                 for out in output:
 297                         out.write("# aquire["+str(field)+"] = "+str(aquire[field]) + "\n")
 298
 299         for out in output:
 300                 out.write("# Parameters:\n")
 301
 302         parameters["Chamber Pressure"] = getPressure() # Update chamber pressure
 303
 304         for field in parameters:
 305                 for out in output:
 306                         out.write("# "+str(field)+" = " + str(parameters[field]) + "\n")
 307
 308
 309         start_time = time.time()
 310
 311         gnuplot("set xlabel \"DAC (counts)\"")
 312         gnuplot("set ylabel \"ADC (counts)\"")
 313
 314
 315         for out in output:
 316                 out.write("\n")
 317                 out.write("# Experiment " + str(datetime.datetime.now()) + "\n")
 318                 out.write("# Polling for " + str(pollTime) + "s.\n")
 319                 out.write("\n")
 320                 out.write("# Data:\n")
 321                 out.write("# time\tDAC")
 322                 for channel in ADC_channels:
 323                         out.write("\tADC"+str(channel))
 324                 out.write("\n")
 325
 326         step = 0
 327         data = [] # Keep track of data for dynamic plotting
 328         dacValue = int(eval(aquire["DAC_Sweep"]))
 329         if (setDAC(dacValue) == False):
 330                 setDAC(dacValue)
 331         time.sleep(2.0)
 332         while (pollTime == None or time.time() < start_time + pollTime):
 333                 if (aquire["DAC_Sweep"] != None):
 334                         nextDacValue = int(eval(aquire["DAC_Sweep"]))
 335                         if (nextDacValue != dacValue):
 336                                 dacValue = nextDacValue
 337                                 if (dacValue < 0):
 338                                         break
 339                                 setDAC(dacValue)
 340                         step += 1
 341
 342
 343                 if (dac_max != None and dacValue >= dac_max):
 344                         break
 345
 346                 measure_start = time.time()
 347
 348                 raw_adc = []
 349
 350                 for channel in ADC_channels:
 351                         read = readADC(channel)
 352                         if read == False:
 353                                 for out in output:
 354                                         print("# Abort data collection due to failed ADC read")
 355                                         if out != sys.stdout:
 356                                                 log_close(out)
 357                                         return False
 358                         raw_adc.append((channel, read[0], read[1]))
 359
 360                 end_time = time.time()
 361
 362                 for out in output:
 363                         measure_time = measure_start + (end_time - measure_start)/2.0 - start_time
 364                         out.write(str(measure_time))
 365                         out.write("\t"+str(dacValue))
 366                         data.append([measure_time, dacValue])
 367
 368                         for adc in raw_adc:
 369                                 out.write("\t" + str(adc[1]) + "\t" + str(adc[2]))
 370                                 data[len(data)-1].append(adc[1])
 371                                 data[len(data)-1].append(adc[2])
 372                         out.write("\n")
 373
 374                 #gnuplot("set yrange [0:1023]")
 375                 #gnuplot("set xrange [0:4000]")
 376                 gnuplot.plot(Gnuplot.Data(data, title="t = "+str(measure_time), with_="lp", using="2:3"))
 377         for out in output:
 378                 if out != sys.stdout:
 379                         log_close(out)
 380         return True
 381
 382 def loadCalibration_ADC(channel):
 383         try:
 384                 input_file = log_open("calibrateADC"+str(channel)+".dat")
 385         except:
 386                 print("Couldn't find calibration file for ADC " + str(channel))
 387                 return False
 388
 389         calibrate["ADC"][channel] = []
 390         for l in input_file:
 391                 l = l.split("#")[0].strip("\r\n ")
 392                 if (l == ""):
 393                         continue
 394                 else:
 395                         split_line = l.split("\t")
 396                         calibrate["ADC"][channel].append((float(split_line[0]), float(split_line[1])))
 397         log_close(input_file)
 398
 399         if (len(calibrate["ADC"][channel]) <= 0):
 400                 print("Empty calibration file for ADC " + str(channel))
 401                 return False
 402         return True
 403
 404 def loadCalibration_DAC():
 405         try:
 406                 input_file = log_open("calibrateDAC.dat")
 407         except:
 408                 print("Couldn't find calibration file for DAC")
 409                 return False
 410
 411         calibrate["DAC"] = []
 412         for l in input_file:
 413                 #print("Line is: "+str(l))
 414                 l = l.split("#")[0].strip("\r\n ")
 415                 if (l == ""):
 416                         continue
 417                 else:
 418                         split_line = l.split("\t")
 419                         if (len(split_line) >= 3):
 420                                 calibrate["DAC"].append((int(split_line[0]), float(split_line[1]), float(split_line[2])))
 421                         else:
 422                                 calibrate["DAC"].append((int(split_line[0]), float(split_line[1])))
 423
 424
 425         log_close(input_file)
 426
 427         if (len(calibrate["DAC"]) <= 0):
 428                 print("Empty calibration file for DAC")
 429                 return False
 430         return True
 431
 432 def getADC_Voltage(channel, counts):
 433         if (calibrate["ADC"][channel] == None or len(calibrate["ADC"][channel]) <= 0):
 434                 if (calibrate["ADC_Rin"][channel] != None and calibrate["ADC_Rvar"][channel] != None):
 435                         print("Warning: Using rough calibration for ADC"+str(channel) + " = " + str(counts))
 436                         ratio = float(calibrate["ADC_Rin"][channel]) / (float(calibrate["ADC_Rin"][channel]) + float(calibrate["ADC_Rvar"][channel]))
 437                         return ratio * (float(counts) / float(calibrate["ADC_Counts"][channel]) * Vref)
 438                 else:
 439                         print("Error: No calibration for ADC"+str(channel))
 440                         return False
 441
 442         c = calibrate["ADC"][channel]
 443         valueIndex = 1
 444         for i in range(0, len(c)-1):
 445                 if (c[i][0] <= counts and i + 1 < len(c)):
 446                         grad = (float(c[i+1][valueIndex]) - float(c[i][valueIndex])) / (float(c[i+1][0]) - float(c[i][0]))
 447                         value = float(c[i][valueIndex]) + grad * (float(counts) - float(c[i][0]))
 448                         return value
 449
 450
 451         print("Warning: Extrapolating outside calibration range for DAC = " + str(counts))
 452
 453         grad = (float(c[len(c)-1][valueIndex]) - float(c[len(c)-2][valueIndex])) / (float(c[len(c)-1][0]) -  float(c[len(c)-2][0]))
 454         value = float(c[len(c)-1][valueIndex]) + grad * (float(counts) - float(c[len(c)-1][0]))
 455
 456 def readADC(channel):
 457         #for i in range(0, aquire["ADC_Averages"]):
 458         #       ser.write("r "+str(channel)+"\r") # Send command to datalogger
 459                 #time.sleep(aquire["response_wait"])
 460         #       response = ser.readline().strip("#\r\n ")
 461         #       if (response != "r "+str(channel)):
 462         #               print("Received wierd response reading ADC ("+response+")")
 463         #               return False
 464                 #time.sleep(aquire["response_wait"])
 465         #       values.append(int(ser.readline().strip("\r\n ")))
 466         #       adc_sum += float(values[len(values)-1])
 467         ser.write("r "+str(channel)+"\r")
 468         response = ser.readline().strip("#\r\n")
 469         if (response != "r "+str(channel)):
 470                 print("Received wierd response reading ADC ("+response+")")
 471                 return False
 472         return ser.readline().strip("\r\n").split(" ")
 473
 474 def getDAC_Voltage(counts, gain = True):
 475         if (calibrate["DAC"] == None or len(calibrate["DAC"]) <= 0):
 476                 if (calibrate["DAC_Gain"] != None):
 477                         print("Warning: Using rough calibration for DAC = " + str(counts))
 478                         return float(counts) / float(calibrate["DAC_Counts"]) * float(calibrate["Vref"]) * float(calibrate["DAC_Gain"])
 479                 else:
 480                         print("Error: No calibrate for DAC")
 481                         return False
 482
 483         valueIndex = 1
 484         if (gain == False):
 485                 valueIndex = 2
 486                 if (len(calibrate["DAC"][0]) < 3):
 487                         print("Error: No data for unamplified DAC")
 488                         return False
 489
 490         c = calibrate["DAC"]
 491         if (len(c) == 1):
 492                 print("Warning: Only one point in calibration data!")
 493                 return float(c[0][valueIndex])
 494
 495         for i in range(0, len(c)-1):
 496                 if (c[i][0] <= counts and i + 1 < len(c)):
 497                         grad = (float(c[i+1][valueIndex]) - float(c[i][valueIndex])) / (float(c[i+1][0]) - float(c[i][0]))
 498                         value = float(c[i][valueIndex]) + grad * (float(counts) - float(c[i][0]))
 499                         return value
 500
 501
 502         print("Warning: Extrapolating outside calibration range for DAC = " + str(counts))
 503
 504         grad = (float(c[len(c)-1][valueIndex]) - float(c[len(c)-2][valueIndex])) / (float(c[len(c)-1][0]) -  float(c[len(c)-2][0]))
 505         value = float(c[len(c)-1][valueIndex]) + grad * (float(counts) - float(c[len(c)-1][0]))
 506         return value
 507
 508
 509 def setDAC(level):
 510
 511         ser.write("d "+str(level)+"\r")
 512
 513         response = ser.readline().strip("#\r\n ")
 514         if (response != "d "+str(level)):
 515                 print("Recieved wierd response setting DAC to "+str(level) + " ("+response+")")
 516                 return False
 517         #time.sleep(aquire["response_wait"])
 518         #time.sleep(aquire["DAC_Settle"])
 519         #time.sleep(aquire["DAC_Settle"])
 520         response = ser.readline().strip("#\r\n ")
 521         if (response != "DAC "+str(level)):
 522                 print("Recieved wierd response setting DAC to "+str(level) + " ("+response+")")
 523                 return False
 524         #time.sleep(aquire["response_wait"])
 525         time.sleep(aquire["DAC_Settle"])
 526
 527
 528 def calibrateADC_usingDAC(channel, gain = True):
 529         if (calibrate["DAC"] == None):
 530                 print("ERROR: DAC is not calibrated, can't use to calibrate ADC!")
 531                 return False
 532
 533         calibrate["ADC"][channel] = []
 534         outfile = log_open("calibrateADC"+str(channel)+".dat", "w")
 535         outfile.write("# Calibrate ADC " + str(channel) + "\n")
 536         outfile.write("# Start " + str(datetime.datetime.now()) + "\n")
 537
 538         print("Connect DAC output to ADC " + str(channel) + " and press enter\n")
 539         sys.stdin.readline()
 540
 541         for dac in calibrate["DAC"]:
 542                 if (setDAC(dac[0]) == False):
 543                         return False
 544
 545                 value = readADC(channel)
 546                 if (value == False):
 547                         return False
 548                 canadd = (len(calibrate["ADC"][channel]) <= 0)
 549                 if (canadd == False):
 550                         canadd = True
 551                         for adc in calibrate["ADC"][channel]:
 552                                 if adc[0] == value[0]:
 553                                         canadd = False
 554                                         break
 555
 556                 if (canadd):
 557
 558                         if gain:
 559                                 input_value = dac[1]
 560                         else:
 561                                 input_value = dac[2]
 562
 563                         #input_value = getDAC_Voltage(dac[0], gain)
 564                         if (input_value == False):
 565                                 return False
 566
 567                         outfile.write(str(value[0]) + "\t" + str(input_value) + "\t" + str(value[1]) + "\n")
 568                         print(str(value[0]) + "\t" + str(input_value) + "\t" + str(value[1]))
 569
 570                         calibrate["ADC"][channel].append((value[0], input_value, value[1]))
 571
 572         outfile.write("# Stop " + str(datetime.datetime.now()) + "\n# EOF\n")
 573         log_close(outfile)
 574         if (setDAC(0) == False):
 575                 return False
 576         if (len(calibrate["ADC"][channel]) <= 0):
 577                 print("Error: No calibration points taken for ADC " + str(channel))
 578                 return False
 579         return True
 580
 581 def calibrateADC(channel):
 582         calibrate["ADC"][channel] = []
 583         outfile = log_open("calibrateADC"+str(channel)+".dat", "w")
 584         outfile.write("# Calibrate ADC " + str(channel) + "\n")
 585         outfile.write("# Start " + str(datetime.datetime.now()) + "\n")
 586
 587         print("Calibrating ADC...\n")
 588         print("Enter measured voltage, empty line stops.\n")
 589
 590         while True:
 591                 read = sys.stdin.readline().strip("\r\n ")
 592                 if (read == ""):
 593                         break
 594                 input_value = float(read)
 595                 output_value = readADC(channel)
 596                 if (output_value == False):
 597                         return False
 598
 599                 calibrate["ADC"][channel].append((output_value[0], input_value))
 600                 print(str(output_value[0]) + "\t" + str(input_value))
 601
 602         calibrate["ADC"][channel].sort(lambda e : e[1], reverse = False)
 603
 604
 605
 606
 607         outfile.write("# Stop " + str(datetime.datetime.now()) + "\n# EOF\n")
 608         log_close(outfile)
 609         if (len(calibrate["ADC"][channel]) <= 0):
 610                 print("Error: No calibration points taken for ADC " + str(channel))
 611                 return False
 612
 613         return True
 614
 615 def calibrateDAC():
 616         calibrate["DAC"] = []
 617
 618         outfile = log_open("calibrateDAC.dat", "w")
 619         outfile.write("# Calibrate DAC\n")
 620         outfile.write("# Start " + str(datetime.datetime.now()) + "\n")
 621
 622         print("Calibrating DAC...")
 623         sys.stdout.write("Number of counts to increment per step: ")
 624         read = sys.stdin.readline().strip("\r\n")
 625         if (read == ""):
 626                 return False
 627         stepSize = max(1, int(read))
 628         sys.stdout.write("\n")
 629
 630         outfile.write("# Increment by " + str(stepSize) + "\n")
 631         print("Input measured DAC voltage for each level; empty input ends calibration.")
 632         print("You may optionally input the DAC voltage before it is amplified too.")
 633
 634         level = 0
 635         while (level < calibrate["DAC_Counts"]):
 636
 637                 setDAC(level)
 638
 639                 sys.stdout.write(str(level) + " ?")
 640                 read = sys.stdin.readline().strip("\r\n ")
 641                 if (read == ""):
 642                         break
 643                 else:
 644                         read = read.split(" ")
 645                         if (len(calibrate["DAC"]) > 0 and len(calibrate["DAC"][len(calibrate["DAC"])-1]) != len(read)):
 646                                 print("Either give one value for EVERY point, or two values for EVERY point. Don't mess around.")
 647                                 return False
 648                         if (len(read) == 2):
 649                                 calibrate["DAC"].append((level, float(read[0]), float(read[1])))
 650                                 outfile.write(str(level) + "\t" + str(float(read[0])) + "\t" + str(float(read[1])) + "\n")
 651                         else:
 652                                 calibrate["DAC"].append((level, float(read[0])))
 653                                 outfile.write(str(level) + "\t" + str(float(read[0])) + "\n")
 654
 655
 656
 657                 level += stepSize
 658
 659         outfile.write("# Stop " + str(datetime.datetime.now()) + "\n# EOF\n")
 660         log_close(outfile)
 661         if (len(calibrate["DAC"]) <= 0):
 662                 print("Error: No calibration points taken for DAC")
 663                 return False
 664         return setDAC(0)
 665
 666 # Run the main function
 667 if __name__ == "__main__":
 668         sys.exit(main())