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 + 1.0*int(step)", # DAC Sweep value (t is in STEPS, not seconds!)
  39         "ADC_Averages" : 100,
  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         ("Deflection Voltage" , None),
  67         ("Title" , None),
  68         ("Comment" , None),
  69         ("602 Scale" , None),
  70         ("Venault Voltage" , None),
  71         ("Accelerating Voltage" , None),
  72         ("Focus Voltage" , None),
  73
  74         ("Initial Voltage" , None),
  75         ("Heating Current" , None),
  76         ("Heating Voltage (across filament)" , None),
  77         ("Heating Voltage (across power supply)", None),
  78         #("610B Zero" , None),
  79         ("602 Zero" , None),
  80         #("610B Scale" , None),
  81
  82         ("602 0.1 Battery" , None),
  83         ("602 0.03 Battery" , None),
  84         ("602 0.01 Battery" , None),
  85         ("602 0.003 Battery" , None),
  86         ("602 0.001 Battery" , None),
  87         ("Sample", None),
  88         ("Sample Angle", None),
  89         ("ADC Regulator" , None),
  90         ("Data" , None),
  91         ("Parameters last checked", None)
  92 ])
  93
  94 def getTime():
  95         return str(datetime.datetime.now()).split(" ")[1].split(".")[0].replace(":","")
  96
  97 def getDate():
  98         return str(datetime.datetime.now()).split(" ")[0]
  99
 100 def getPressure():
 101
 102         try:
 103                 p = subprocess.Popen("./pressure/get_pressure.sh", stdout=subprocess.PIPE)
 104                 #p = subprocess.Popen("./this_program_does_not_exist.sh", stdout=subprocess.PIPE)
 105                 #result = float("a")
 106                 result = float(p.stdout.readline().strip(" \r\n\t"))
 107         except:
 108                 return 0.0
 109         return result
 110
 111
 112 # Used for when I press Control-C to stop things
 113 def set_exit_handler(func):
 114     if os.name == "nt":
 115         try:
 116             import win32api
 117             win32api.SetConsoleCtrlHandler(func, True)
 118         except ImportError:
 119             version = ".".join(map(str, sys.version_info[:2]))
 120             raise Exception("pywin32 not installed for Python " + version)
 121     else:
 122         import signal
 123         signal.signal(signal.SIGTERM, func)
 124         signal.signal(signal.SIGINT, func)
 125
 126 def killed_handler(signal, frame):
 127         reason = ""
 128         sys.stdout.write("\n# Reason for killing program? ")
 129         reason = sys.stdin.readline().strip("\r\n ")
 130         for out in aquire["open_files"]:
 131                 sys.stdout.write("# Closing file " + str(out) + "\n")
 132                 out.write("# Recieved KILL signal.\n# Reason: " + str(reason) + "\n")
 133                 log_close(out)
 134
 135
 136
 137 def cleanup():
 138         for out in aquire["open_files"]:
 139                 out.write("# Program exits.\n")
 140                 log_close(out)
 141
 142 def log_open(a, b):
 143         result = open(a, b,0)
 144         if (b == "w"):
 145                 result.write("# File opened at " + str(datetime.datetime.now()) + "\n")
 146                 aquire["open_files"].append(result)
 147         return result
 148
 149 def log_close(afile):
 150         if (afile in aquire["open_files"]):
 151                 afile.write("# File closed at " + str(datetime.datetime.now()) + "\n")
 152                 aquire["open_files"].remove(afile)
 153
 154         afile.close()
 155
 156
 157 def init():
 158         #import atexit
 159         #atexit.register(cleanup)
 160         set_exit_handler(killed_handler)
 161
 162         aquire["start_date"] = getDate()
 163
 164
 165
 166         # Connect serial
 167         ser.open()
 168         ser.isOpen()
 169 #       print("Waiting for \"# hello\" from device...")
 170 #       while (ser.readline().strip("\r\n") != "# hello"):
 171 #               pass
 172         #while (ser.readline().strip("\r\n ") != "#"):
 173         #       pass
 174         #time.sleep(1.0)
 175
 176         ser.write("a "+str(aquire["ADC_Averages"]) + "\r\n")
 177         ser.readline().strip("\r\n")
 178         ser.readline().strip("\r\n")
 179         ser.readline().strip("\r\n")
 180         #print(ser.readline().strip("\r\n"))
 181         #print(ser.readline().strip("\r\n"))
 182         #print(ser.readline().strip("\r\n"))
 183
 184         #print("Writing config information to config.dat...")
 185         #output = log_open("config.dat", "w", 1)
 186
 187         #output.write("# Initialise " + str(datetime.datetime.now()) + "\n")
 188
 189         #for field in calibrate:
 190         #       output.write("# calibrate["+str(field)+"] = "+str(calibrate[field]) + "\n")
 191         #output.write("\n")
 192         #for field in aquire:
 193         #       output.write("# aquire["+str(field)+"] = "+str(aquire[field]) + "\n")
 194
 195         #output.write("# Ready " + str(datetime.datetime.now()) + "\n# EOF\n")
 196         #output.close()
 197
 198 def main():
 199
 200         init()
 201
 202         # I haven't ever used calibrated results, and yet this code is still here, why???
 203         #if (loadCalibration_DAC() == False):
 204         #       if (calibrateDAC() == False):
 205         #               return -1
 206         #if (loadCalibration_ADC(aquire["ADC_Is"]) == False):
 207         #       if (calibrateADC_usingDAC(aquire["ADC_Is"], False) == False):
 208         #               if (calibrateADC(aquire["ADC_Is"]) == False):
 209         #                       return -1
 210
 211         #if (loadCalibration_ADC(aquire["ADC_Vi"]) == False):
 212         #       if (calibrateADC_usingDAC(aquire["ADC_Vi"], True) == False):
 213         #               if (calibrateADC(aquire["ADC_Vi"]) == False):
 214         #                       return -1
 215
 216
 217         # Make directory for today, backup calibration files
 218         os.system("mkdir -p " + getDate())
 219         #os.system("cp *.dat " + getDate() +"/")
 220
 221         checkList()
 222
 223
 224
 225
 226
 227         # Experiment
 228         # TODO: Modify data to record here
 229         sweep = 1
 230         #for i in range(0,1):
 231         while True:
 232                 os.system("mkdir -p " + getDate())
 233                 record_data([5], getDate()+"/"+str(getTime())+".dat", None, 4001)
 234
 235                 try:
 236                         pass
 237                         #os.system("echo \"Sweep number " + str(sweep) + " completed\" | festival --tts")
 238                 except:
 239                         pass
 240                 sweep += 1
 241         #setDAC(500)
 242
 243         try:
 244                 os.system("echo \"Experiment complete\" | festival --tts")
 245         except:
 246                 pass
 247
 248
 249 def checkList():
 250         try:
 251                 input_file = log_open(getDate()+"/checklist", "r")
 252         except:
 253                 input_file = None
 254
 255         if (input_file != None):
 256                 for line in input_file:
 257                         k = line.split("=")
 258                         item = None
 259                         if (len(k) >= 2):
 260                                 item = k[0].strip("# \r\n")
 261                                 value = k[1].strip("# \r\n")
 262
 263                         if (item in parameters):
 264                                 if item == "Chamber Pressure":
 265                                         parameters[item] = getPressure()
 266                                 else:
 267                                         parameters[item] = value
 268
 269                 #print("Checklist found. Overwrite? [Y/n]")
 270                 response = "" #sys.stdin.readline().strip(" \r\n")
 271                 if (response == "" or response == "y" or response == "Y"):
 272                         input_file = log_open(getDate()+"/checklist.old", "w")
 273                         for item in parameters:
 274                                 input_file.write("# " + str(item) + " = " + str(parameters[item]) + "\n")
 275                         input_file.write("\n")
 276                         log_close(input_file)
 277                         input_file = None
 278
 279         if (input_file == None):
 280                 for item in parameters:
 281                         if item == "Parameters last checked":
 282                                 continue
 283                         if item == "Chamber Pressure":
 284                                 #sys.stdout.write("\""+str(item)+"\" = " + str(parameters[item]) + " - get new pressure... ")
 285                                 parameters[item] = getPressure()
 286                                 #sys.stdout.write(str(parameters[item]) + "\n")
 287                                 continue
 288
 289                         sys.stdout.write("\""+str(item)+"\" = " + str(parameters[item]) + " New value?: ")
 290                         response = sys.stdin.readline().strip("\r\n ")
 291                         if (response == "!"):
 292                                 break
 293                         if (response != ""):
 294                                 parameters[item] = response
 295                         sys.stdout.write("\n")
 296                 parameters["Parameters last checked"] = str(datetime.datetime.now())
 297
 298
 299         checklist = log_open(getDate()+"/checklist", "w")
 300         for item in parameters:
 301                 checklist.write("# "+str(item) + " = " + str(parameters[item]) + "\n")
 302                 #output_file.write("# "+str(item) + " = " + str(parameters[item]) + "\n")
 303         log_close(checklist)
 304
 305
 306 def record_data(ADC_channels, output, pollTime = None, dac_max = None):
 307
 308         if (output != None):
 309                 gnuplot("set title \""+str(output)+"\"")
 310                 output = [log_open(output, "w"), sys.stdout]
 311
 312         else:
 313                 gnuplot("set title \"<No file>\"")
 314                 output = [sys.stdout]
 315
 316         for field in aquire:
 317                 for out in output:
 318                         out.write("# aquire["+str(field)+"] = "+str(aquire[field]) + "\n")
 319
 320         for out in output:
 321                 out.write("# Parameters:\n")
 322
 323         parameters["Chamber Pressure"] = getPressure() # Update chamber pressure
 324
 325         for field in parameters:
 326                 for out in output:
 327                         out.write("# "+str(field)+" = " + str(parameters[field]) + "\n")
 328
 329
 330         start_time = time.time()
 331
 332         gnuplot("set xlabel \"DAC (counts)\"")
 333         gnuplot("set ylabel \"ADC (counts)\"")
 334
 335
 336         for out in output:
 337                 out.write("\n")
 338                 out.write("# Experiment " + str(datetime.datetime.now()) + "\n")
 339                 out.write("# Polling for " + str(pollTime) + "s.\n")
 340                 out.write("\n")
 341                 out.write("# Data:\n")
 342                 out.write("# time\tDAC")
 343                 for channel in ADC_channels:
 344                         out.write("\tADC"+str(channel))
 345                 out.write("\n")
 346
 347         step = 0
 348         data = [] # Keep track of data for dynamic plotting
 349         dacValue = int(eval(aquire["DAC_Sweep"]))
 350         if (setDAC(dacValue) == False):
 351                 setDAC(dacValue)
 352         time.sleep(2.0)
 353         while (pollTime == None or time.time() < start_time + pollTime):
 354                 if (aquire["DAC_Sweep"] != None):
 355                         nextDacValue = int(eval(aquire["DAC_Sweep"]))
 356                         if (nextDacValue != dacValue):
 357                                 dacValue = nextDacValue
 358                                 if (dacValue < 0):
 359                                         break
 360                                 setDAC(dacValue)
 361                         step += 1
 362
 363
 364                 if (dac_max != None and dacValue >= dac_max):
 365                         break
 366
 367                 measure_start = time.time()
 368
 369                 raw_adc = []
 370
 371                 for channel in ADC_channels:
 372                         read = readADC(channel)
 373                         if read == False:
 374                                 for out in output:
 375                                         print("# Abort data collection due to failed ADC read")
 376                                         if out != sys.stdout:
 377                                                 log_close(out)
 378                                         return False
 379                         raw_adc.append((channel, read[0], read[1]))
 380
 381                 end_time = time.time()
 382
 383                 for out in output:
 384                         measure_time = measure_start + (end_time - measure_start)/2.0 - start_time
 385                         out.write(str(measure_time))
 386                         out.write("\t"+str(dacValue))
 387                         data.append([measure_time, dacValue])
 388
 389                         for adc in raw_adc:
 390                                 out.write("\t" + str(adc[1]) + "\t" + str(adc[2]))
 391                                 data[len(data)-1].append(adc[1])
 392                                 data[len(data)-1].append(adc[2])
 393                         out.write("\n")
 394
 395                 #gnuplot("set yrange [0:1023]")
 396                 #gnuplot("set xrange [0:4000]")
 397                 gnuplot("set xlabel \"DAC (counts)\"")
 398                 gnuplot("set ylabel \"Sample Current (ADC counts)\"")
 399                 gnuplot.plot(Gnuplot.Data(data, title="t = "+str(measure_time), with_="lp", using="2:3"))
 400         for out in output:
 401                 if out != sys.stdout:
 402                         log_close(out)
 403         return True
 404
 405 def loadCalibration_ADC(channel):
 406         try:
 407                 input_file = log_open("calibrateADC"+str(channel)+".dat")
 408         except:
 409                 print("Couldn't find calibration file for ADC " + str(channel))
 410                 return False
 411
 412         calibrate["ADC"][channel] = []
 413         for l in input_file:
 414                 l = l.split("#")[0].strip("\r\n ")
 415                 if (l == ""):
 416                         continue
 417                 else:
 418                         split_line = l.split("\t")
 419                         calibrate["ADC"][channel].append((float(split_line[0]), float(split_line[1])))
 420         log_close(input_file)
 421
 422         if (len(calibrate["ADC"][channel]) <= 0):
 423                 print("Empty calibration file for ADC " + str(channel))
 424                 return False
 425         return True
 426
 427 def loadCalibration_DAC():
 428         try:
 429                 input_file = log_open("calibrateDAC.dat")
 430         except:
 431                 print("Couldn't find calibration file for DAC")
 432                 return False
 433
 434         calibrate["DAC"] = []
 435         for l in input_file:
 436                 #print("Line is: "+str(l))
 437                 l = l.split("#")[0].strip("\r\n ")
 438                 if (l == ""):
 439                         continue
 440                 else:
 441                         split_line = l.split("\t")
 442                         if (len(split_line) >= 3):
 443                                 calibrate["DAC"].append((int(split_line[0]), float(split_line[1]), float(split_line[2])))
 444                         else:
 445                                 calibrate["DAC"].append((int(split_line[0]), float(split_line[1])))
 446
 447
 448         log_close(input_file)
 449
 450         if (len(calibrate["DAC"]) <= 0):
 451                 print("Empty calibration file for DAC")
 452                 return False
 453         return True
 454
 455 def getADC_Voltage(channel, counts):
 456         if (calibrate["ADC"][channel] == None or len(calibrate["ADC"][channel]) <= 0):
 457                 if (calibrate["ADC_Rin"][channel] != None and calibrate["ADC_Rvar"][channel] != None):
 458                         print("Warning: Using rough calibration for ADC"+str(channel) + " = " + str(counts))
 459                         ratio = float(calibrate["ADC_Rin"][channel]) / (float(calibrate["ADC_Rin"][channel]) + float(calibrate["ADC_Rvar"][channel]))
 460                         return ratio * (float(counts) / float(calibrate["ADC_Counts"][channel]) * Vref)
 461                 else:
 462                         print("Error: No calibration for ADC"+str(channel))
 463                         return False
 464
 465         c = calibrate["ADC"][channel]
 466         valueIndex = 1
 467         for i in range(0, len(c)-1):
 468                 if (c[i][0] <= counts and i + 1 < len(c)):
 469                         grad = (float(c[i+1][valueIndex]) - float(c[i][valueIndex])) / (float(c[i+1][0]) - float(c[i][0]))
 470                         value = float(c[i][valueIndex]) + grad * (float(counts) - float(c[i][0]))
 471                         return value
 472
 473
 474         print("Warning: Extrapolating outside calibration range for DAC = " + str(counts))
 475
 476         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]))
 477         value = float(c[len(c)-1][valueIndex]) + grad * (float(counts) - float(c[len(c)-1][0]))
 478
 479 def readADC(channel):
 480         #for i in range(0, aquire["ADC_Averages"]):
 481         #       ser.write("r "+str(channel)+"\r") # Send command to datalogger
 482                 #time.sleep(aquire["response_wait"])
 483         #       response = ser.readline().strip("#\r\n ")
 484         #       if (response != "r "+str(channel)):
 485         #               print("Received wierd response reading ADC ("+response+")")
 486         #               return False
 487                 #time.sleep(aquire["response_wait"])
 488         #       values.append(int(ser.readline().strip("\r\n ")))
 489         #       adc_sum += float(values[len(values)-1])
 490         ser.write("r "+str(channel)+"\r")
 491         response = ser.readline().strip("#\r\n")
 492         if (response != "r "+str(channel)):
 493                 print("Received wierd response reading ADC ("+response+")")
 494                 return False
 495         return ser.readline().strip("\r\n").split(" ")
 496
 497 def getDAC_Voltage(counts, gain = True):
 498         if (calibrate["DAC"] == None or len(calibrate["DAC"]) <= 0):
 499                 if (calibrate["DAC_Gain"] != None):
 500                         print("Warning: Using rough calibration for DAC = " + str(counts))
 501                         return float(counts) / float(calibrate["DAC_Counts"]) * float(calibrate["Vref"]) * float(calibrate["DAC_Gain"])
 502                 else:
 503                         print("Error: No calibrate for DAC")
 504                         return False
 505
 506         valueIndex = 1
 507         if (gain == False):
 508                 valueIndex = 2
 509                 if (len(calibrate["DAC"][0]) < 3):
 510                         print("Error: No data for unamplified DAC")
 511                         return False
 512
 513         c = calibrate["DAC"]
 514         if (len(c) == 1):
 515                 print("Warning: Only one point in calibration data!")
 516                 return float(c[0][valueIndex])
 517
 518         for i in range(0, len(c)-1):
 519                 if (c[i][0] <= counts and i + 1 < len(c)):
 520                         grad = (float(c[i+1][valueIndex]) - float(c[i][valueIndex])) / (float(c[i+1][0]) - float(c[i][0]))
 521                         value = float(c[i][valueIndex]) + grad * (float(counts) - float(c[i][0]))
 522                         return value
 523
 524
 525         print("Warning: Extrapolating outside calibration range for DAC = " + str(counts))
 526
 527         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]))
 528         value = float(c[len(c)-1][valueIndex]) + grad * (float(counts) - float(c[len(c)-1][0]))
 529         return value
 530
 531
 532 def setDAC(level):
 533
 534         ser.write("d "+str(level)+"\r")
 535
 536         response = ser.readline().strip("#\r\n ")
 537         if (response != "d "+str(level)):
 538                 print("Recieved wierd response setting DAC to "+str(level) + " ("+response+")")
 539                 return False
 540         #time.sleep(aquire["response_wait"])
 541         #time.sleep(aquire["DAC_Settle"])
 542         #time.sleep(aquire["DAC_Settle"])
 543         response = ser.readline().strip("#\r\n ")
 544         if (response != "DAC "+str(level)):
 545                 print("Recieved wierd response setting DAC to "+str(level) + " ("+response+")")
 546                 return False
 547         #time.sleep(aquire["response_wait"])
 548         time.sleep(aquire["DAC_Settle"])
 549
 550
 551 def calibrateADC_usingDAC(channel, gain = True):
 552         if (calibrate["DAC"] == None):
 553                 print("ERROR: DAC is not calibrated, can't use to calibrate ADC!")
 554                 return False
 555
 556         calibrate["ADC"][channel] = []
 557         outfile = log_open("calibrateADC"+str(channel)+".dat", "w")
 558         outfile.write("# Calibrate ADC " + str(channel) + "\n")
 559         outfile.write("# Start " + str(datetime.datetime.now()) + "\n")
 560
 561         print("Connect DAC output to ADC " + str(channel) + " and press enter\n")
 562         sys.stdin.readline()
 563
 564         for dac in calibrate["DAC"]:
 565                 if (setDAC(dac[0]) == False):
 566                         return False
 567
 568                 value = readADC(channel)
 569                 if (value == False):
 570                         return False
 571                 canadd = (len(calibrate["ADC"][channel]) <= 0)
 572                 if (canadd == False):
 573                         canadd = True
 574                         for adc in calibrate["ADC"][channel]:
 575                                 if adc[0] == value[0]:
 576                                         canadd = False
 577                                         break
 578
 579                 if (canadd):
 580
 581                         if gain:
 582                                 input_value = dac[1]
 583                         else:
 584                                 input_value = dac[2]
 585
 586                         #input_value = getDAC_Voltage(dac[0], gain)
 587                         if (input_value == False):
 588                                 return False
 589
 590                         outfile.write(str(value[0]) + "\t" + str(input_value) + "\t" + str(value[1]) + "\n")
 591                         print(str(value[0]) + "\t" + str(input_value) + "\t" + str(value[1]))
 592
 593                         calibrate["ADC"][channel].append((value[0], input_value, value[1]))
 594
 595         outfile.write("# Stop " + str(datetime.datetime.now()) + "\n# EOF\n")
 596         log_close(outfile)
 597         if (setDAC(0) == False):
 598                 return False
 599         if (len(calibrate["ADC"][channel]) <= 0):
 600                 print("Error: No calibration points taken for ADC " + str(channel))
 601                 return False
 602         return True
 603
 604 def calibrateADC(channel):
 605         calibrate["ADC"][channel] = []
 606         outfile = log_open("calibrateADC"+str(channel)+".dat", "w")
 607         outfile.write("# Calibrate ADC " + str(channel) + "\n")
 608         outfile.write("# Start " + str(datetime.datetime.now()) + "\n")
 609
 610         print("Calibrating ADC...\n")
 611         print("Enter measured voltage, empty line stops.\n")
 612
 613         while True:
 614                 read = sys.stdin.readline().strip("\r\n ")
 615                 if (read == ""):
 616                         break
 617                 input_value = float(read)
 618                 output_value = readADC(channel)
 619                 if (output_value == False):
 620                         return False
 621
 622                 calibrate["ADC"][channel].append((output_value[0], input_value))
 623                 print(str(output_value[0]) + "\t" + str(input_value))
 624
 625         calibrate["ADC"][channel].sort(lambda e : e[1], reverse = False)
 626
 627
 628
 629
 630         outfile.write("# Stop " + str(datetime.datetime.now()) + "\n# EOF\n")
 631         log_close(outfile)
 632         if (len(calibrate["ADC"][channel]) <= 0):
 633                 print("Error: No calibration points taken for ADC " + str(channel))
 634                 return False
 635
 636         return True
 637
 638 def calibrateDAC():
 639         calibrate["DAC"] = []
 640
 641         outfile = log_open("calibrateDAC.dat", "w")
 642         outfile.write("# Calibrate DAC\n")
 643         outfile.write("# Start " + str(datetime.datetime.now()) + "\n")
 644
 645         print("Calibrating DAC...")
 646         sys.stdout.write("Number of counts to increment per step: ")
 647         read = sys.stdin.readline().strip("\r\n")
 648         if (read == ""):
 649                 return False
 650         stepSize = max(1, int(read))
 651         sys.stdout.write("\n")
 652
 653         outfile.write("# Increment by " + str(stepSize) + "\n")
 654         print("Input measured DAC voltage for each level; empty input ends calibration.")
 655         print("You may optionally input the DAC voltage before it is amplified too.")
 656
 657         level = 0
 658         while (level < calibrate["DAC_Counts"]):
 659
 660                 setDAC(level)
 661
 662                 sys.stdout.write(str(level) + " ?")
 663                 read = sys.stdin.readline().strip("\r\n ")
 664                 if (read == ""):
 665                         break
 666                 else:
 667                         read = read.split(" ")
 668                         if (len(calibrate["DAC"]) > 0 and len(calibrate["DAC"][len(calibrate["DAC"])-1]) != len(read)):
 669                                 print("Either give one value for EVERY point, or two values for EVERY point. Don't mess around.")
 670                                 return False
 671                         if (len(read) == 2):
 672                                 calibrate["DAC"].append((level, float(read[0]), float(read[1])))
 673                                 outfile.write(str(level) + "\t" + str(float(read[0])) + "\t" + str(float(read[1])) + "\n")
 674                         else:
 675                                 calibrate["DAC"].append((level, float(read[0])))
 676                                 outfile.write(str(level) + "\t" + str(float(read[0])) + "\n")
 677
 678
 679
 680                 level += stepSize
 681
 682         outfile.write("# Stop " + str(datetime.datetime.now()) + "\n# EOF\n")
 683         log_close(outfile)
 684         if (len(calibrate["DAC"]) <= 0):
 685                 print("Error: No calibration points taken for DAC")
 686                 return False
 687         return setDAC(0)
 688
 689 # Run the main function
 690 if __name__ == "__main__":
 691         sys.exit(main())