David Gouveia

#!/usr/bin/python
import serial
import sys
 
latestByte  = ('c')
lastByte    = ('c')
inPacket    = False
myPacket    = []
PLENGTH     = 0
 
EEGVALUES    = []
EEGRAWVALUES = []
 
def parsePacket():
  if checksum():
    i=1
    while i < len(myPacket) - 1:
      if ord(myPacket[i]) == 0x02:
        POOR_SIGNAL = ord(myPacket[i+1])
        i += 2
      elif ord(myPacket[i]) == 0x04:
        ATTENTION = ord(myPacket[i+1])
        i += 2
      elif ord(myPacket[i]) == 0x05:
        MEDITATION = ord(myPacket[i+1])
        i += 2
      elif ord(myPacket[i]) == 0x16:
        BLINK_STRENGTH = ord(myPacket[i+1])
        i += 2
      elif ord(myPacket[i]) == 0x83:
        for c in xrange(i+1, i+25, 3):
          EEGVALUES.append(ord(myPacket[c]) << 16 | ord(myPacket[c+1]) << 8 | ord(myPacket[c+2]))
        i += 26
      elif ord(myPacket[i]) == 0x80:
        EEGRAWVALUES = ord(myPacket[i+1]) << 8 | ord(myPacket[i+2])         i += 4     print "%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d" % (POOR_SIGNAL,ATTENTION,MEDITATION,EEGVALUES[0],EEGVALUES[1],EEGVALUES[2],EEGVALUES[3],EEGVALUES[4],EEGVALUES[5],EEGVALUES[6],EEGVALUES[7])   else:     print "Invalid Checksum!" def checksum():   x = 0   for i in range(1, len(myPacket) -1):     x += ord(myPacket[i])   return ~(x&255) & 0b11111111 == ord(myPacket[len(myPacket)-1]) def readCSV():   global myPacket, lastByte, LatestByte, inPacket, PLENGTH   ser = serial.Serial(       port=sys.argv[1],       baudrate=9600,       parity=serial.PARITY_NONE,       stopbits=serial.STOPBITS_ONE,       bytesize=serial.SEVENBITS   )   ser.isOpen()   try:     while 1 :       while ser.inWaiting() > 0:
        latestByte = ser.read(1)
 
        if ord(lastByte) == 170 and ord(latestByte) == 170 and inPacket == False:
          inPacket   = True
 
        elif len(myPacket) == 1:
          myPacket.append(latestByte)
          PLENGTH = ord(myPacket[0])
 
        elif inPacket == True:
          myPacket.append(latestByte)
          if len(myPacket) > 169:
            print "Error: Data Error too long!"
            del myPacket[:]
            inPacket = False
            del EEGVALUES[:]
          elif len(myPacket) == PLENGTH + 2:
            parsePacket()
            del myPacket[:]
            inPacket = False
            del EEGVALUES[:]
 
 
        lastByte = latestByte
 
  except KeyboardInterrupt:
    print('Exiting...')
    if ser.isOpen():
      ser.close();
    sys.exit(0)
 
if len(sys.argv) < 2:
  print "Mindflex datalogger by David gouveia <david.gouveia[at]gmail[dot]com>"
  print "Usage: %s " % sys.argv[0]
  sys.exit(1)
 
readCSV()