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" : "2000.0 + 500.0*int(step/500)", # 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/ttyUSB0", # 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         ("Title" , None),
  67         ("Comment" , None),
  68         ("602 Scale" , None),
  69         ("Venault Voltage" , None),
  70         ("Accelerating Voltage" , None),
  71         ("Focus Voltage" , None),
  72         ("Deflection Voltage" , None),
  73         ("Initial Voltage" , None),
  74         ("Heating Current" , None),
  75         ("Heating Voltage (across filament)" , None),
  76         ("Heating Voltage (across power supply)", None),
  77         #("610B Zero" , None),
  78         ("602 Zero" , None),
  79         #("610B Scale" , None),
  80
  81         ("602 0.1 Battery" , None),
  82         ("602 0.03 Battery" , None),
  83         ("602 0.01 Battery" , None),
  84         ("602 0.003 Battery" , None),
  85         ("602 0.001 Battery" , None),
  86         ("Sample", None),
  87         ("Sample Angle", None),
  88         ("ADC Regulator" , None),
  89         ("Data" , None),
  90         ("Parameters last checked", None)
  91 ])
  92
  93 def getTime():
  94         return str(datetime.datetime.now()).split(" ")[1].split(".")[0].replace(":","")
  95
  96 def getDate():
  97         return str(datetime.datetime.now()).split(" ")[0]
  98
  99 def getPressure():
 100
 101         try:
 102                 p = subprocess.Popen("./pressure/get_pressure.sh", stdout=subprocess.PIPE)
 103                 #p = subprocess.Popen("./this_program_does_not_exist.sh", stdout=subprocess.PIPE)
 104                 #result = float("a")
 105                 result = float(p.stdout.readline().strip(" \r\n\t"))
 106         except:
 107                 return 0.0
 108         return result
 109
 110
 111 # Used for when I press Control-C to stop things
 112 def set_exit_handler(func):
 113     if os.name == "nt":
 114         try:
 115             import win32api
 116             win32api.SetConsoleCtrlHandler(func, True)
 117         except ImportError:
 118             version = ".".join(map(str, sys.version_info[:2]))
 119             raise Exception("pywin32 not installed for Python " + version)
 120     else:
 121         import signal
 122         signal.signal(signal.SIGTERM, func)
 123         signal.signal(signal.SIGINT, func)
 124
 125 def killed_handler(signal, frame):
 126         reason = ""
 127         sys.stdout.write("\n# Reason for killing program? ")
 128         reason = sys.stdin.readline().strip("\r\n ")
 129         for out in aquire["open_files"]:
 130                 sys.stdout.write("# Closing file " + str(out) + "\n")
 131                 out.write("# Recieved KILL signal.\n# Reason: " + str(reason) + "\n")
 132                 log_close(out)
 133
 134
 135
 136 def cleanup():
 137         for out in aquire["open_files"]:
 138                 out.write("# Program exits.\n")
 139                 log_close(out)
 140
 141 def log_open(a, b):
 142         result = open(a, b,0)
 143         if (b == "w"):
 144                 result.write("# File opened at " + str(datetime.datetime.now()) + "\n")
 145                 aquire["open_files"].append(result)
 146         return result
 147
 148 def log_close(afile):
 149         if (afile in aquire["open_files"]):
 150                 afile.write("# File closed at " + str(datetime.datetime.now()) + "\n")
 151                 aquire["open_files"].remove(afile)
 152
 153         afile.close()
 154
 155
 156 def init():
 157         #import atexit
 158         #atexit.register(cleanup)
 159         set_exit_handler(killed_handler)
 160
 161         aquire["start_date"] = getDate()
 162
 163
 164
 165         # Connect serial
 166         ser.open()
 167         ser.isOpen()
 168 #       print("Waiting for \"# hello\" from device...")
 169 #       while (ser.readline().strip("\r\n") != "# hello"):
 170 #               pass
 171         #while (ser.readline().strip("\r\n ") != "#"):
 172         #       pass
 173         #time.sleep(1.0)
 174
 175         ser.write("a "+str(aquire["ADC_Averages"]) + "\r\n")
 176         ser.readline().strip("\r\n")
 177         ser.readline().strip("\r\n")
 178         ser.readline().strip("\r\n")
 179         #print(ser.readline().strip("\r\n"))
 180         #print(ser.readline().strip("\r\n"))
 181         #print(ser.readline().strip("\r\n"))
 182
 183         #print("Writing config information to config.dat...")
 184         #output = log_open("config.dat", "w", 1)
 185
 186         #output.write("# Initialise " + str(datetime.datetime.now()) + "\n")
 187
 188         #for field in calibrate:
 189         #       output.write("# calibrate["+str(field)+"] = "+str(calibrate[field]) + "\n")
 190         #output.write("\n")
 191         #for field in aquire:
 192         #       output.write("# aquire["+str(field)+"] = "+str(aquire[field]) + "\n")
 193
 194         #output.write("# Ready " + str(datetime.datetime.now()) + "\n# EOF\n")
 195         #output.close()
 196
 197 def main():
 198
 199         init()
 200
 201         # I haven't ever used calibrated results, and yet this code is still here, why???
 202         #if (loadCalibration_DAC() == False):
 203         #       if (calibrateDAC() == False):
 204         #               return -1
 205         #if (loadCalibration_ADC(aquire["ADC_Is"]) == False):
 206         #       if (calibrateADC_usingDAC(aquire["ADC_Is"], False) == False):
 207         #               if (calibrateADC(aquire["ADC_Is"]) == False):
 208         #                       return -1
 209
 210         #if (loadCalibration_ADC(aquire["ADC_Vi"]) == False):
 211         #       if (calibrateADC_usingDAC(aquire["ADC_Vi"], True) == False):
 212         #               if (calibrateADC(aquire["ADC_Vi"]) == False):
 213         #                       return -1
 214
 215
 216         # Make directory for today, backup calibration files
 217         os.system("mkdir -p " + getDate())
 218         #os.system("cp *.dat " + getDate() +"/")
 219
 220         checkList()
 221
 222
 223
 224
 225
 226         # Experiment
 227         # TODO: Modify data to record here
 228         sweep = 1
 229         #for i in range(0,5):
 230         while True:
 231                 os.system("mkdir -p " + getDate())
 232                 record_data([5], getDate()+"/"+str(getTime())+".dat", None, 4001)
 233                 sweep += 1
 234         #setDAC(500)
 235
 236 def checkList():
 237         try:
 238                 input_file = log_open(getDate()+"/checklist", "r")
 239         except:
 240                 input_file = None
 241
 242         if (input_file != None):
 243                 for line in input_file:
 244                         k = line.split("=")
 245                         item = None
 246                         if (len(k) >= 2):
 247                                 item = k[0].strip("# \r\n")
 248                                 value = k[1].strip("# \r\n")
 249
 250                         if (item in parameters):
 251                                 if item == "Chamber Pressure":
 252                                         parameters[item] = getPressure()
 253                                 else:
 254                                         parameters[item] = value
 255
 256                 #print("Checklist found. Overwrite? [Y/n]")
 257                 response = "" #sys.stdin.readline().strip(" \r\n")
 258                 if (response == "" or response == "y" or response == "Y"):
 259                         input_file = log_open(getDate()+"/checklist.old", "w")
 260                         for item in parameters:
 261                                 input_file.write("# " + str(item) + " = " + str(parameters[item]) + "\n")
 262                         input_file.write("\n")
 263                         log_close(input_file)
 264                         input_file = None
 265
 266         if (input_file == None):
 267                 for item in parameters:
 268                         if item == "Parameters last checked":
 269                                 continue
 270                         if item == "Chamber Pressure":
 271                                 #sys.stdout.write("\""+str(item)+"\" = " + str(parameters[item]) + " - get new pressure... ")
 272                                 parameters[item] = getPressure()
 273                                 #sys.stdout.write(str(parameters[item]) + "\n")
 274                                 continue
 275
 276                         sys.stdout.write("\""+str(item)+"\" = " + str(parameters[item]) + " New value?: ")
 277                         response = sys.stdin.readline().strip("\r\n ")
 278                         if (response == "!"):
 279                                 break
 280                         if (response != ""):
 281                                 parameters[item] = response
 282                         sys.stdout.write("\n")
 283                 parameters["Parameters last checked"] = str(datetime.datetime.now())
 284
 285
 286         checklist = log_open(getDate()+"/checklist", "w")
 287         for item in parameters:
 288                 checklist.write("# "+str(item) + " = " + str(parameters[item]) + "\n")
 289                 #output_file.write("# "+str(item) + " = " + str(parameters[item]) + "\n")
 290         log_close(checklist)
 291
 292
 293 def record_data(ADC_channels, output, pollTime = None, dac_max = None):
 294
 295         if (output != None):
 296                 gnuplot("set title \""+str(output)+"\"")
 297                 output = [log_open(output, "w"), sys.stdout]
 298
 299         else:
 300                 gnuplot("set title \"<No file>\"")
 301                 output = [sys.stdout]
 302
 303         for field in aquire:
 304                 for out in output:
 305                         out.write("# aquire["+str(field)+"] = "+str(aquire[field]) + "\n")
 306
 307         for out in output:
 308                 out.write("# Parameters:\n")
 309
 310         parameters["Chamber Pressure"] = getPressure() # Update chamber pressure
 311
 312         for field in parameters:
 313                 for out in output:
 314                         out.write("# "+str(field)+" = " + str(parameters[field]) + "\n")
 315
 316
 317         start_time = time.time()
 318
 319         gnuplot("set xlabel \"DAC (counts)\"")
 320         gnuplot("set ylabel \"ADC (counts)\"")
 321
 322
 323         for out in output:
 324                 out.write("\n")
 325                 out.write("# Experiment " + str(datetime.datetime.now()) + "\n")
 326                 out.write("# Polling for " + str(pollTime) + "s.\n")
 327                 out.write("\n")
 328                 out.write("# Data:\n")
 329                 out.write("# time\tDAC")
 330                 for channel in ADC_channels:
 331                         out.write("\tADC"+str(channel))
 332                 out.write("\n")
 333
 334         step = 0
 335         data = [] # Keep track of data for dynamic plotting
 336         dacValue = int(eval(aquire["DAC_Sweep"]))
 337         if (setDAC(dacValue) == False):
 338                 setDAC(dacValue)
 339         time.sleep(2.0)
 340         while (pollTime == None or time.time() < start_time + pollTime):
 341                 if (aquire["DAC_Sweep"] != None):
 342                         nextDacValue = int(eval(aquire["DAC_Sweep"]))
 343                         if (nextDacValue != dacValue):
 344                                 dacValue = nextDacValue
 345                                 if (dacValue < 0):
 346                                         break
 347                                 setDAC(dacValue)
 348                         step += 1
 349
 350
 351                 if (dac_max != None and dacValue >= dac_max):
 352                         break
 353
 354                 measure_start = time.time()
 355
 356                 raw_adc = []
 357
 358                 for channel in ADC_channels:
 359                         read = readADC(channel)
 360                         if read == False:
 361                                 for out in output:
 362                                         print("# Abort data collection due to failed ADC read")
 363                                         if out != sys.stdout:
 364                                                 log_close(out)
 365                                         return False
 366                         raw_adc.append((channel, read[0], read[1]))
 367
 368                 end_time = time.time()
 369
 370                 for out in output:
 371                         measure_time = measure_start + (end_time - measure_start)/2.0 - start_time
 372                         out.write(str(measure_time))
 373                         out.write("\t"+str(dacValue))
 374                         data.append([measure_time, dacValue])
 375
 376                         for adc in raw_adc:
 377                                 out.write("\t" + str(adc[1]) + "\t" + str(adc[2]))
 378                                 data[len(data)-1].append(adc[1])
 379                                 data[len(data)-1].append(adc[2])
 380                         out.write("\n")
 381
 382                 #gnuplot("set yrange [0:1023]")
 383                 #gnuplot("set xrange [0:4000]")
 384                 gnuplot("set xlabel \"DAC (counts)\"")
 385                 gnuplot("set ylabel \"Sample Current (ADC counts)\"")
 386                 gnuplot.plot(Gnuplot.Data(data, title="t = "+str(measure_time), with_="lp", using="2:3"))
 387         for out in output:
 388                 if out != sys.stdout:
 389                         log_close(out)
 390         return True
 391
 392 def loadCalibration_ADC(channel):
 393         try:
 394                 input_file = log_open("calibrateADC"+str(channel)+".dat")
 395         except:
 396                 print("Couldn't find calibration file for ADC " + str(channel))
 397                 return False
 398
 399         calibrate["ADC"][channel] = []
 400         for l in input_file:
 401                 l = l.split("#")[0].strip("\r\n ")
 402                 if (l == ""):
 403                         continue
 404                 else:
 405                         split_line = l.split("\t")
 406                         calibrate["ADC"][channel].append((float(split_line[0]), float(split_line[1])))
 407         log_close(input_file)
 408
 409         if (len(calibrate["ADC"][channel]) <= 0):
 410                 print("Empty calibration file for ADC " + str(channel))
 411                 return False
 412         return True
 413
 414 def loadCalibration_DAC():
 415         try:
 416                 input_file = log_open("calibrateDAC.dat")
 417         except:
 418                 print("Couldn't find calibration file for DAC")
 419                 return False
 420
 421         calibrate["DAC"] = []
 422         for l in input_file:
 423                 #print("Line is: "+str(l))
 424                 l = l.split("#")[0].strip("\r\n ")
 425                 if (l == ""):
 426                         continue
 427                 else:
 428                         split_line = l.split("\t")
 429                         if (len(split_line) >= 3):
 430                                 calibrate["DAC"].append((int(split_line[0]), float(split_line[1]), float(split_line[2])))
 431                         else:
 432                                 calibrate["DAC"].append((int(split_line[0]), float(split_line[1])))
 433
 434
 435         log_close(input_file)
 436
 437         if (len(calibrate["DAC"]) <= 0):
 438                 print("Empty calibration file for DAC")
 439                 return False
 440         return True
 441
 442 def getADC_Voltage(channel, counts):
 443         if (calibrate["ADC"][channel] == None or len(calibrate["ADC"][channel]) <= 0):
 444                 if (calibrate["ADC_Rin"][channel] != None and calibrate["ADC_Rvar"][channel] != None):
 445                         print("Warning: Using rough calibration for ADC"+str(channel) + " = " + str(counts))
 446                         ratio = float(calibrate["ADC_Rin"][channel]) / (float(calibrate["ADC_Rin"][channel]) + float(calibrate["ADC_Rvar"][channel]))
 447                         return ratio * (float(counts) / float(calibrate["ADC_Counts"][channel]) * Vref)
 448                 else:
 449                         print("Error: No calibration for ADC"+str(channel))
 450                         return False
 451
 452         c = calibrate["ADC"][channel]
 453         valueIndex = 1
 454         for i in range(0, len(c)-1):
 455                 if (c[i][0] <= counts and i + 1 < len(c)):
 456                         grad = (float(c[i+1][valueIndex]) - float(c[i][valueIndex])) / (float(c[i+1][0]) - float(c[i][0]))
 457                         value = float(c[i][valueIndex]) + grad * (float(counts) - float(c[i][0]))
 458                         return value
 459
 460
 461         print("Warning: Extrapolating outside calibration range for DAC = " + str(counts))
 462
 463         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]))
 464         value = float(c[len(c)-1][valueIndex]) + grad * (float(counts) - float(c[len(c)-1][0]))
 465
 466 def readADC(channel):
 467         #for i in range(0, aquire["ADC_Averages"]):
 468         #       ser.write("r "+str(channel)+"\r") # Send command to datalogger
 469                 #time.sleep(aquire["response_wait"])
 470         #       response = ser.readline().strip("#\r\n ")
 471         #       if (response != "r "+str(channel)):
 472         #               print("Received wierd response reading ADC ("+response+")")
 473         #               return False
 474                 #time.sleep(aquire["response_wait"])
 475         #       values.append(int(ser.readline().strip("\r\n ")))
 476         #       adc_sum += float(values[len(values)-1])
 477         ser.write("r "+str(channel)+"\r")
 478         response = ser.readline().strip("#\r\n")
 479         if (response != "r "+str(channel)):
 480                 print("Received wierd response reading ADC ("+response+")")
 481                 return False
 482         return ser.readline().strip("\r\n").split(" ")
 483
 484 def getDAC_Voltage(counts, gain = True):
 485         if (calibrate["DAC"] == None or len(calibrate["DAC"]) <= 0):
 486                 if (calibrate["DAC_Gain"] != None):
 487                         print("Warning: Using rough calibration for DAC = " + str(counts))
 488                         return float(counts) / float(calibrate["DAC_Counts"]) * float(calibrate["Vref"]) * float(calibrate["DAC_Gain"])
 489                 else:
 490                         print("Error: No calibrate for DAC")
 491                         return False
 492
 493         valueIndex = 1
 494         if (gain == False):
 495                 valueIndex = 2
 496                 if (len(calibrate["DAC"][0]) < 3):
 497                         print("Error: No data for unamplified DAC")
 498                         return False
 499
 500         c = calibrate["DAC"]
 501         if (len(c) == 1):
 502                 print("Warning: Only one point in calibration data!")
 503                 return float(c[0][valueIndex])
 504
 505         for i in range(0, len(c)-1):
 506                 if (c[i][0] <= counts and i + 1 < len(c)):
 507                         grad = (float(c[i+1][valueIndex]) - float(c[i][valueIndex])) / (float(c[i+1][0]) - float(c[i][0]))
 508                         value = float(c[i][valueIndex]) + grad * (float(counts) - float(c[i][0]))
 509                         return value
 510
 511
 512         print("Warning: Extrapolating outside calibration range for DAC = " + str(counts))
 513
 514         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]))
 515         value = float(c[len(c)-1][valueIndex]) + grad * (float(counts) - float(c[len(c)-1][0]))
 516         return value
 517
 518
 519 def setDAC(level):
 520
 521         ser.write("d "+str(level)+"\r")
 522
 523         response = ser.readline().strip("#\r\n ")
 524         if (response != "d "+str(level)):
 525                 print("Recieved wierd response setting DAC to "+str(level) + " ("+response+")")
 526                 return False
 527         #time.sleep(aquire["response_wait"])
 528         #time.sleep(aquire["DAC_Settle"])
 529         #time.sleep(aquire["DAC_Settle"])
 530         response = ser.readline().strip("#\r\n ")
 531         if (response != "DAC "+str(level)):
 532                 print("Recieved wierd response setting DAC to "+str(level) + " ("+response+")")
 533                 return False
 534         #time.sleep(aquire["response_wait"])
 535         time.sleep(aquire["DAC_Settle"])
 536
 537
 538 def calibrateADC_usingDAC(channel, gain = True):
 539         if (calibrate["DAC"] == None):
 540                 print("ERROR: DAC is not calibrated, can't use to calibrate ADC!")
 541                 return False
 542
 543         calibrate["ADC"][channel] = []
 544         outfile = log_open("calibrateADC"+str(channel)+".dat", "w")
 545         outfile.write("# Calibrate ADC " + str(channel) + "\n")
 546         outfile.write("# Start " + str(datetime.datetime.now()) + "\n")
 547
 548         print("Connect DAC output to ADC " + str(channel) + " and press enter\n")
 549         sys.stdin.readline()
 550
 551         for dac in calibrate["DAC"]:
 552                 if (setDAC(dac[0]) == False):
 553                         return False
 554
 555                 value = readADC(channel)
 556                 if (value == False):
 557                         return False
 558                 canadd = (len(calibrate["ADC"][channel]) <= 0)
 559                 if (canadd == False):
 560                         canadd = True
 561                         for adc in calibrate["ADC"][channel]:
 562                                 if adc[0] == value[0]:
 563                                         canadd = False
 564                                         break
 565
 566                 if (canadd):
 567
 568                         if gain:
 569                                 input_value = dac[1]
 570                         else:
 571                                 input_value = dac[2]
 572
 573                         #input_value = getDAC_Voltage(dac[0], gain)
 574                         if (input_value == False):
 575                                 return False
 576
 577                         outfile.write(str(value[0]) + "\t" + str(input_value) + "\t" + str(value[1]) + "\n")
 578                         print(str(value[0]) + "\t" + str(input_value) + "\t" + str(value[1]))
 579
 580                         calibrate["ADC"][channel].append((value[0], input_value, value[1]))
 581
 582         outfile.write("# Stop " + str(datetime.datetime.now()) + "\n# EOF\n")
 583         log_close(outfile)
 584         if (setDAC(0) == False):
 585                 return False
 586         if (len(calibrate["ADC"][channel]) <= 0):
 587                 print("Error: No calibration points taken for ADC " + str(channel))
 588                 return False
 589         return True
 590
 591 def calibrateADC(channel):
 592         calibrate["ADC"][channel] = []
 593         outfile = log_open("calibrateADC"+str(channel)+".dat", "w")
 594         outfile.write("# Calibrate ADC " + str(channel) + "\n")
 595         outfile.write("# Start " + str(datetime.datetime.now()) + "\n")
 596
 597         print("Calibrating ADC...\n")
 598         print("Enter measured voltage, empty line stops.\n")
 599
 600         while True:
 601                 read = sys.stdin.readline().strip("\r\n ")
 602                 if (read == ""):
 603                         break
 604                 input_value = float(read)
 605                 output_value = readADC(channel)
 606                 if (output_value == False):
 607                         return False
 608
 609                 calibrate["ADC"][channel].append((output_value[0], input_value))
 610                 print(str(output_value[0]) + "\t" + str(input_value))
 611
 612         calibrate["ADC"][channel].sort(lambda e : e[1], reverse = False)
 613
 614
 615
 616
 617         outfile.write("# Stop " + str(datetime.datetime.now()) + "\n# EOF\n")
 618         log_close(outfile)
 619         if (len(calibrate["ADC"][channel]) <= 0):
 620                 print("Error: No calibration points taken for ADC " + str(channel))
 621                 return False
 622
 623         return True
 624
 625 def calibrateDAC():
 626         calibrate["DAC"] = []
 627
 628         outfile = log_open("calibrateDAC.dat", "w")
 629         outfile.write("# Calibrate DAC\n")
 630         outfile.write("# Start " + str(datetime.datetime.now()) + "\n")
 631
 632         print("Calibrating DAC...")
 633         sys.stdout.write("Number of counts to increment per step: ")
 634         read = sys.stdin.readline().strip("\r\n")
 635         if (read == ""):
 636                 return False
 637         stepSize = max(1, int(read))
 638         sys.stdout.write("\n")
 639
 640         outfile.write("# Increment by " + str(stepSize) + "\n")
 641         print("Input measured DAC voltage for each level; empty input ends calibration.")
 642         print("You may optionally input the DAC voltage before it is amplified too.")
 643
 644         level = 0
 645         while (level < calibrate["DAC_Counts"]):
 646
 647                 setDAC(level)
 648
 649                 sys.stdout.write(str(level) + " ?")
 650                 read = sys.stdin.readline().strip("\r\n ")
 651                 if (read == ""):
 652                         break
 653                 else:
 654                         read = read.split(" ")
 655                         if (len(calibrate["DAC"]) > 0 and len(calibrate["DAC"][len(calibrate["DAC"])-1]) != len(read)):
 656                                 print("Either give one value for EVERY point, or two values for EVERY point. Don't mess around.")
 657                                 return False
 658                         if (len(read) == 2):
 659                                 calibrate["DAC"].append((level, float(read[0]), float(read[1])))
 660                                 outfile.write(str(level) + "\t" + str(float(read[0])) + "\t" + str(float(read[1])) + "\n")
 661                         else:
 662                                 calibrate["DAC"].append((level, float(read[0])))
 663                                 outfile.write(str(level) + "\t" + str(float(read[0])) + "\n")
 664
 665
 666
 667                 level += stepSize
 668
 669         outfile.write("# Stop " + str(datetime.datetime.now()) + "\n# EOF\n")
 670         log_close(outfile)
 671         if (len(calibrate["DAC"]) <= 0):
 672                 print("Error: No calibration points taken for DAC")
 673                 return False
 674         return setDAC(0)
 675
 676 # Run the main function
 677 if __name__ == "__main__":
 678         sys.exit(main())