jsantanders · November 27, 2016 03:33 · Nov 27, 2016
diff --git a/CRC16.py b/CRC16.py
@@ -0,0 +1,51 @@
+import random
+
+class  CRC16:
+    #codificacion de bits basado en el estandar CRC-12
+    def __init__(self, word):
+        self.word = word
+        print("La trama a transmitir es:\n", bin(int(self.word,2)))
+    G = 0b11000000000000101     #Polinomio generador G(x)
+
+    def mod2(self,data):
+        Glist = [1,1,0,0,0,0,0,0,0,0,0,0,0,0,1,0,1]
+        Wordlist =  [int(d) for d in str(bin(data))[2:]]
+        while len(Glist) <= len(Wordlist) and Wordlist:
+            if Wordlist[0] == Glist[0]:
+                del Wordlist[0]
+                for j in range(len(Glist)-1):
+                    Wordlist[j] ^= Glist[j+1]
+            while Wordlist and Wordlist[0] == 0:
+                del Wordlist[0]
+        if not Wordlist:
+            return 0
+        else:
+            CRCstring = ''.join(str(e) for e in Wordlist)
+            CRCdata = int(CRCstring,2)
+            return CRCdata
+
+    def M(self):
+        stringdata = self.word + '0000000000000000'    #Agregar 13 bits 0 a la palabra
+        dataM = int(stringdata,2)                      #Convertirlos a binarios
+        CRC = self.mod2(dataM)                         #Operacion Mod2
+        CRCfix = format(CRC, 'b').zfill(16)
+        Tstring = str(self.word) + CRCfix              #Palabra binaria
+        T = int(Tstring,2)
+        return T
+
+def  verificar(word):
+    if Trama.mod2(word) == 0:
+        print("La transmisión se realizó sin errores")
+    else:
+        print("Hubo errores en la transmisión")
+
+#Parte principal del programa
+
+Wordinput = input("Ingrese la trama binaria:\n")
+Trama = CRC16(Wordinput)                               #Objeto de la clase CRC16
+print("La palabra códificada es: \n", bin(Trama.M()))        
+
+biterror = random.randint(0,1)    
+wordrecived =  biterror + Trama.M()
+print("La palabra recibida es:\n",bin(wordrecived))
+verificar(wordrecived)