rfid_USB

#!/usr/bin/env python3
import math
import serial
import binascii
import subprocess
import time
from bitstring import BitArray

tags = {}

com_port = '/dev/ttyUSB0'
baud_rate = 115200
ser = serial.Serial(com_port, baud_rate, timeout=1)

def checksum(data):
	cSum = 0x00
	for byte in data:
		cSum += byte
	return (((~cSum) + 1) + (1 << 8)) % (1 << 8)

def send(cmd, data=None):
     msg = [0xA0, 0x00, 0x01, cmd]
     if data:
          msg.extend(data)
     msg[1] = len(msg) - 1
     msg.append(checksum(msg))
     ser.write(msg)

def ean_checksum(data):
     even = False
     cSum = 0
     for i in map(int,reversed(str(data))):
          if even:
               cSum += i
               even = False
          else:
               cSum += i * 3
               even = True
     return (int(math.ceil(cSum / 10.0)) * 10) - cSum

send(0x76,data=[0x14])
time.sleep(1)
ans = ser.read(ser.read(2)[1])
send(0x7a, data=[0x00])
ans = ser.read(ser.read(2)[1])
send(0x89, data=[0xff])

timer = time.time()
while True:
     try:
          ans = BitArray(ser.read(ser.read(2)[1])[5:])
          if ans.hex[:2] == '30':
               filt = BitArray(ans[8:11])
               part = BitArray(ans[11:14])
               ans = ans[14:]
               if part.uint == 0:
                    company_len = 40
                    indicator_len = 4
               elif part.uint == 1:
                    company_len = 37
                    indicator_len = 7
               elif part.uint == 2:
                    company_len = 34
                    indicator_len = 10
               elif part.uint == 3:
                    company_len = 30
                    indicator_len = 14
               elif part.uint == 4:
                    company_len = 27
                    indicator_len = 17
               elif part.uint == 5:
                    company_len = 24
                    indicator_len = 20
               elif part.uint == 6:
                    company_len = 20
                    indicator_len = 24

               company = BitArray(ans[:company_len])
               indicator = BitArray(ans[company_len:company_len+indicator_len])
               #serNum = BitArray(ans[company_len+indicator_len:company_len+indicator_len+38])

               barcode = (company.uint * 100000 + indicator.uint) * 10 + ean_checksum(company.uint * 100000 + indicator.uint)
               #if ans[-16:][:8].uint <= 55:
#               print(str(barcode), end=' - ')
#               print(ans[-16:][:8].uint)


#               if barcode not in tags:
#                    tags[barcode] = [int(time.time()), 0]
#               else:
#                    tags[barcode][1] += 1

#               for tag in tags.keys():
#                    if int(time.time()) - tags[tag][0] <= 3:
#                         if tags[tag][1] >= 3:
#                              subprocess.call(["xdotool", "type", str(barcode)])
#                              subprocess.call(["xdotool", "key", "Return"])
#                              print (tag, end=' - ')
#                              print(int(time.time()))
#                              del tags[tag]
#                    else:
#                         del tags[tag]
               subprocess.call(["xdotool", "type", str(barcode)])
               subprocess.call(["xdotool", "key", "Return"])

#               print(str(barcode) + '*', end=' - ')
#               print(ans[-16:][:8].uint)

     except Exception as e:
          #print(e)
          if time.time() - timer > 3600:
               send(0x70)
               timer = time.time()
          send(0x89, data=[0xff])

exit()