Irayya Mathad / CRC

prototype

Dependents:   Mbed_Prototype_copy_4_INNO_day_15_6_2017

crc.cpp@1:fc4b4d69aa7a, 2017-05-29 (annotated)

Committer:
irayya
Date:
Mon May 29 03:56:36 2017 +0000
Revision:
1:fc4b4d69aa7a
Parent:
0:b3b7346e07fe
Child:
2:c0d73ae91788
CRC

Who changed what in which revision?

UserRevisionLine numberNew contents of line
irayya 0:b3b7346e07fe 1 #include "mbed.h"
irayya 0:b3b7346e07fe 2 #include "crc.h"
irayya 0:b3b7346e07fe 3 Serial output(USBTX,USBRX);
irayya 0:b3b7346e07fe 4 char result1[18];
irayya 0:b3b7346e07fe 5 int binary1[256];
irayya 0:b3b7346e07fe 6 char binary2[256];
irayya 0:b3b7346e07fe 7 int generator[]= {1,0,0,0,0,1,0,0,0,0,0,0,1,0,0,0};
irayya 0:b3b7346e07fe 8 int v,v1;
irayya 0:b3b7346e07fe 9
irayya 0:b3b7346e07fe 10
irayya 0:b3b7346e07fe 11
irayya 0:b3b7346e07fe 12 char* crcCheck_transmit(char* targetChar)
irayya 0:b3b7346e07fe 13 {
irayya 0:b3b7346e07fe 14 int i1,j1,k1,l1,h1;
irayya 1:fc4b4d69aa7a 15 //char* str = malloc(3 * sizeof(char));
irayya 0:b3b7346e07fe 16 //Get Frame
irayya 0:b3b7346e07fe 17
irayya 0:b3b7346e07fe 18
irayya 0:b3b7346e07fe 19 v=0,v1=0;
irayya 0:b3b7346e07fe 20 for(h1=0; h1<strlen(targetChar); h1++) {
irayya 0:b3b7346e07fe 21 printBinary(targetChar[h1]);
irayya 0:b3b7346e07fe 22 output.printf(" - ");
irayya 0:b3b7346e07fe 23 }
irayya 0:b3b7346e07fe 24 //output.printf("%d",sizeof(f));
irayya 0:b3b7346e07fe 25 output.printf("\n The data to be analyzed is : ");
irayya 0:b3b7346e07fe 26 int frame[v+16];
irayya 0:b3b7346e07fe 27 for(h1=0; h1<v; h1++) {
irayya 0:b3b7346e07fe 28 output.printf("%d",binary1[h1]);
irayya 0:b3b7346e07fe 29 frame[h1]=binary1[h1];
irayya 0:b3b7346e07fe 30 }
irayya 0:b3b7346e07fe 31
irayya 0:b3b7346e07fe 32 output.printf("\n The value of v is : %d ",v);
irayya 0:b3b7346e07fe 33
irayya 0:b3b7346e07fe 34 output.printf("\n Sender Side:");
irayya 0:b3b7346e07fe 35 output.printf("\n Frame: ");
irayya 0:b3b7346e07fe 36 for(i1=0; i1<v; i1++) {
irayya 0:b3b7346e07fe 37 output.printf("%d",frame[i1]);
irayya 0:b3b7346e07fe 38 }
irayya 0:b3b7346e07fe 39 output.printf("\n Generator : ");
irayya 0:b3b7346e07fe 40 for(i1=0; i1<16; i1++) {
irayya 0:b3b7346e07fe 41 output.printf("%d",generator[i1]);
irayya 0:b3b7346e07fe 42 }
irayya 0:b3b7346e07fe 43
irayya 0:b3b7346e07fe 44 //Append 0's
irayya 0:b3b7346e07fe 45 int rs1=16-1;
irayya 0:b3b7346e07fe 46 for (i1=v; i1<v+rs1; i1++) {
irayya 0:b3b7346e07fe 47 frame[i1]=0;
irayya 0:b3b7346e07fe 48 }
irayya 0:b3b7346e07fe 49
irayya 0:b3b7346e07fe 50 int temp2[v+16];
irayya 0:b3b7346e07fe 51 for(i1=0; i1<v+16; i1++) {
irayya 0:b3b7346e07fe 52 temp2[i1]=frame[i1];
irayya 0:b3b7346e07fe 53 }
irayya 0:b3b7346e07fe 54
irayya 0:b3b7346e07fe 55 output.printf("\n Message after appending 0's :");
irayya 0:b3b7346e07fe 56 for(i1=0; i1<v+rs1; i1++) {
irayya 0:b3b7346e07fe 57 output.printf("%d",temp2[i1]);
irayya 0:b3b7346e07fe 58 }
irayya 0:b3b7346e07fe 59
irayya 0:b3b7346e07fe 60 //Division
irayya 0:b3b7346e07fe 61 for(i1=0; i1<v; i1++) {
irayya 0:b3b7346e07fe 62 j1=0;
irayya 0:b3b7346e07fe 63 k1=i1;
irayya 0:b3b7346e07fe 64 //check whether it is divisible or not
irayya 0:b3b7346e07fe 65 if (temp2[k1]>=generator[j1]) {
irayya 0:b3b7346e07fe 66 for(j1=0,k1=i1; j1<16; j1++,k1++) {
irayya 0:b3b7346e07fe 67 if((temp2[k1]==1 && generator[j1]==1) || (temp2[k1]==0 && generator[j1]==0)) {
irayya 0:b3b7346e07fe 68 temp2[k1]=0;
irayya 0:b3b7346e07fe 69 } else {
irayya 0:b3b7346e07fe 70 temp2[k1]=1;
irayya 0:b3b7346e07fe 71 }
irayya 0:b3b7346e07fe 72 }
irayya 0:b3b7346e07fe 73 }
irayya 0:b3b7346e07fe 74 }
irayya 0:b3b7346e07fe 75
irayya 0:b3b7346e07fe 76 //CRC
irayya 0:b3b7346e07fe 77 int crc[16];
irayya 0:b3b7346e07fe 78 for(i1=0,j1=v; i1<rs1; i1++,j1++) {
irayya 0:b3b7346e07fe 79 crc[i1]=temp2[j1];
irayya 0:b3b7346e07fe 80 }
irayya 0:b3b7346e07fe 81
irayya 0:b3b7346e07fe 82 output.printf("\n CRC bits: ");
irayya 0:b3b7346e07fe 83 for(i1=0; i1<rs1; i1++) {
irayya 0:b3b7346e07fe 84 output.printf("%d",crc[i1]);
irayya 0:b3b7346e07fe 85 }
irayya 0:b3b7346e07fe 86
irayya 1:fc4b4d69aa7a 87 /* output.printf("\n Transmitted Frame: ");
irayya 1:fc4b4d69aa7a 88 int tf2[v+16];
irayya 1:fc4b4d69aa7a 89 char tf3[v+16];
irayya 1:fc4b4d69aa7a 90 for(i1=0; i1<v; i1++) {
irayya 1:fc4b4d69aa7a 91 tf2[i1]=frame[i1];
irayya 1:fc4b4d69aa7a 92 }
irayya 1:fc4b4d69aa7a 93 for(i1=v,j1=0; i1<v+rs1; i1++,j1++) {
irayya 1:fc4b4d69aa7a 94 tf2[i1]=crc[j1];
irayya 1:fc4b4d69aa7a 95 }
irayya 1:fc4b4d69aa7a 96 for(i1=0; i1<v+rs1; i1++) {
irayya 1:fc4b4d69aa7a 97 output.printf("%d",tf2[i1]);
irayya 1:fc4b4d69aa7a 98 }
irayya 1:fc4b4d69aa7a 99
irayya 1:fc4b4d69aa7a 100 tf2[v+rs1]=0;
irayya 1:fc4b4d69aa7a 101
irayya 1:fc4b4d69aa7a 102 output.printf("\n The final data to be sent is : ");
irayya 1:fc4b4d69aa7a 103 for(i1=0; i1<=v+rs1; i1++) {
irayya 1:fc4b4d69aa7a 104 output.printf("%d",tf2[i1]);
irayya 1:fc4b4d69aa7a 105 }*/
irayya 0:b3b7346e07fe 106 crc[15]=0;
irayya 0:b3b7346e07fe 107 for(i1=0; i1<16; i1++) {
irayya 0:b3b7346e07fe 108 charBinary(crc[i1]);
irayya 0:b3b7346e07fe 109 }
irayya 0:b3b7346e07fe 110 output.printf("\n The final data to be sent is : ");
irayya 0:b3b7346e07fe 111 for(i1=0; i1<16; i1++) {
irayya 0:b3b7346e07fe 112 output.printf("%c",binary2[i1]);
irayya 0:b3b7346e07fe 113 }
irayya 0:b3b7346e07fe 114 printChar(binary2);
irayya 0:b3b7346e07fe 115 char* str=result1;
irayya 1:fc4b4d69aa7a 116
irayya 0:b3b7346e07fe 117 v=0,v1=0;
irayya 0:b3b7346e07fe 118 return str;
irayya 0:b3b7346e07fe 119 }
irayya 1:fc4b4d69aa7a 120 int crcCheck_receive(char a1[])
irayya 0:b3b7346e07fe 121 {
irayya 0:b3b7346e07fe 122 int i,j,k,l;
irayya 0:b3b7346e07fe 123 int rs=15;
irayya 0:b3b7346e07fe 124 v=0;
irayya 0:b3b7346e07fe 125 output.printf("\n Receiver side : ");
irayya 0:b3b7346e07fe 126 output.printf("\n Received Frame: ");
irayya 0:b3b7346e07fe 127
irayya 1:fc4b4d69aa7a 128 for(int m=0; m<strlen(a1); m++) {
irayya 1:fc4b4d69aa7a 129 printBinary(a1[m]);
irayya 1:fc4b4d69aa7a 130 output.printf("-");
irayya 1:fc4b4d69aa7a 131 }
irayya 0:b3b7346e07fe 132 for(i=0; i<v; i++) {
irayya 0:b3b7346e07fe 133 output.printf("%d",binary1[i]);
irayya 0:b3b7346e07fe 134 }
irayya 0:b3b7346e07fe 135 v=v-16;
irayya 0:b3b7346e07fe 136 int tf[v+16];
irayya 0:b3b7346e07fe 137 for(i=0; i<v+rs; i++) {
irayya 0:b3b7346e07fe 138 tf[i]=binary1[i];
irayya 0:b3b7346e07fe 139 }
irayya 0:b3b7346e07fe 140 output.printf("\n");
irayya 0:b3b7346e07fe 141 output.printf("The data to be Analyzed on the receiving side : ");
irayya 0:b3b7346e07fe 142 for(i=0; i<v+rs; i++) {
irayya 0:b3b7346e07fe 143 output.printf("%d",tf[i]);
irayya 0:b3b7346e07fe 144 }
irayya 0:b3b7346e07fe 145 int temp[v+16];
irayya 0:b3b7346e07fe 146 for(i=0; i<v+rs; i++) {
irayya 0:b3b7346e07fe 147 temp[i]=tf[i];
irayya 0:b3b7346e07fe 148 }
irayya 0:b3b7346e07fe 149
irayya 0:b3b7346e07fe 150 //Division
irayya 0:b3b7346e07fe 151 for(i=0; i<v+rs; i++) {
irayya 0:b3b7346e07fe 152 j=0;
irayya 0:b3b7346e07fe 153 k=i;
irayya 0:b3b7346e07fe 154 if (temp[k]>=generator[j]) {
irayya 0:b3b7346e07fe 155 for(j=0,k=i; j<16; j++,k++) {
irayya 0:b3b7346e07fe 156 if((temp[k]==1 && generator[j]==1) || (temp[k]==0 && generator[j]==0)) {
irayya 0:b3b7346e07fe 157 temp[k]=0;
irayya 0:b3b7346e07fe 158 } else {
irayya 0:b3b7346e07fe 159 temp[k]=1;
irayya 0:b3b7346e07fe 160 }
irayya 0:b3b7346e07fe 161 }
irayya 0:b3b7346e07fe 162 }
irayya 0:b3b7346e07fe 163 }
irayya 0:b3b7346e07fe 164
irayya 0:b3b7346e07fe 165 output.printf("\n Reaminder: ");
irayya 0:b3b7346e07fe 166 int rrem[16];
irayya 0:b3b7346e07fe 167 for (i=v,j=0; i<v+rs; i++,j++) {
irayya 0:b3b7346e07fe 168 rrem[j]= temp[i];
irayya 0:b3b7346e07fe 169 }
irayya 0:b3b7346e07fe 170 for(i=0; i<rs; i++) {
irayya 0:b3b7346e07fe 171 output.printf("%d",rrem[i]);
irayya 0:b3b7346e07fe 172 }
irayya 0:b3b7346e07fe 173
irayya 0:b3b7346e07fe 174 int flag=0;
irayya 0:b3b7346e07fe 175 for(i=0; i<rs; i++) {
irayya 0:b3b7346e07fe 176 if(rrem[i]!=0) {
irayya 0:b3b7346e07fe 177 flag=1;
irayya 0:b3b7346e07fe 178 }
irayya 0:b3b7346e07fe 179 }
irayya 0:b3b7346e07fe 180
irayya 0:b3b7346e07fe 181 if(flag==0) {
irayya 0:b3b7346e07fe 182 //output.printf("\n Since Remainder Is 0 Hence Message Transmitted From Sender To Receriver Is Correct");
irayya 0:b3b7346e07fe 183 return 0;
irayya 1:fc4b4d69aa7a 184
irayya 0:b3b7346e07fe 185
irayya 0:b3b7346e07fe 186 } else {
irayya 1:fc4b4d69aa7a 187 // output.printf(" \n Since Remainder Is Not 0 Hence Message Transmitted From Sender To Receriver Contains Error");
irayya 1:fc4b4d69aa7a 188 return 1;
irayya 0:b3b7346e07fe 189 }
irayya 0:b3b7346e07fe 190 v=0;
irayya 0:b3b7346e07fe 191 }
irayya 0:b3b7346e07fe 192
irayya 0:b3b7346e07fe 193 void printBinary(char c)
irayya 0:b3b7346e07fe 194 {
irayya 0:b3b7346e07fe 195
irayya 0:b3b7346e07fe 196 for (int i = 7; i >= 0; --i) {
irayya 0:b3b7346e07fe 197 int x = ((c & (1 << i))? 1 : 0);
irayya 0:b3b7346e07fe 198 output.printf("%d",x);
irayya 0:b3b7346e07fe 199 binary1[v]=x;
irayya 0:b3b7346e07fe 200 v++;
irayya 0:b3b7346e07fe 201 }
irayya 0:b3b7346e07fe 202 }
irayya 0:b3b7346e07fe 203
irayya 0:b3b7346e07fe 204 void charBinary(int c1)
irayya 0:b3b7346e07fe 205 {
irayya 0:b3b7346e07fe 206 char x1 = ((c1 & 1)? '1' : '0');
irayya 0:b3b7346e07fe 207 // output.printf("%c",x1);
irayya 0:b3b7346e07fe 208 binary2[v1]=x1;
irayya 0:b3b7346e07fe 209 v1++;
irayya 0:b3b7346e07fe 210 }
irayya 0:b3b7346e07fe 211
irayya 0:b3b7346e07fe 212
irayya 0:b3b7346e07fe 213 /* ####### printChar function ########## */
irayya 0:b3b7346e07fe 214
irayya 0:b3b7346e07fe 215 void printChar(char x2[])
irayya 0:b3b7346e07fe 216 {
irayya 0:b3b7346e07fe 217
irayya 0:b3b7346e07fe 218 //memcpy(a, b, sizeof(a));
irayya 0:b3b7346e07fe 219 char *ON = x2 ;
irayya 0:b3b7346e07fe 220 output.printf("\n");
irayya 0:b3b7346e07fe 221 output.printf("%c",x2);
irayya 0:b3b7346e07fe 222 char subbuff[9];
irayya 0:b3b7346e07fe 223 for(int j=0; j<sizeof(result1); j++) {
irayya 0:b3b7346e07fe 224 result1[j]='\0';
irayya 0:b3b7346e07fe 225 }
irayya 0:b3b7346e07fe 226 unsigned char c3;
irayya 0:b3b7346e07fe 227 int k1;
irayya 0:b3b7346e07fe 228 int index = 0;
irayya 0:b3b7346e07fe 229 int fichero_len = (int)strlen(ON);
irayya 0:b3b7346e07fe 230
irayya 0:b3b7346e07fe 231 for(k1 = 0; k1 < fichero_len; k1 += 8) {
irayya 0:b3b7346e07fe 232 memcpy(subbuff, &ON[k1], 8); // <--- copy 8 butes only
irayya 0:b3b7346e07fe 233 subbuff[8] = '\0';
irayya 0:b3b7346e07fe 234 c3 = (unsigned char)strtol(subbuff, 0, 2);
irayya 0:b3b7346e07fe 235 //printf("\%s = %c = %d = 0x%.2X\n", subbuff, c3, c3, c3);
irayya 0:b3b7346e07fe 236 result1[index++] = c3;
irayya 0:b3b7346e07fe 237 result1[index] = '\0';
irayya 0:b3b7346e07fe 238 }
irayya 0:b3b7346e07fe 239 printf("\nResult = %s\n", result1);
irayya 0:b3b7346e07fe 240
irayya 0:b3b7346e07fe 241 }