ajeet prajapati
ntg
Dependents: AESslave_modified_test_27-9-2017 AESslave_modified_test_copy AESslave_modified_test_27-9-2017
Diff: crc.cpp
- Revision:
- 0:ffa9fb6be9a1
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/crc.cpp Wed Sep 27 10:16:49 2017 +0000
@@ -0,0 +1,284 @@
+#include "mbed.h"
+#include "crc.h"
+Serial output(USBTX,USBRX); //USB serial to print the data in the console
+char result1[18]; //To store the character format of the CRC bit
+int binary1[256]; //To store the binary data in integer type
+char binary2[256]; //To store the binary data in chracter type
+int generator[]= {1,0,0,0,0,1,0,0,0,0,0,0,1,0,0,0}; //CRC generator
+int v,v1;
+
+
+//Function for generating CRC and transmitting it
+char* crcCheck_transmit(char* targetChar) //for transmission the data from gateway to slave device with crc
+{
+ int i1,j1,k1,l1,h1;
+
+
+
+ v=0,v1=0;
+ for(h1=0; h1<16; h1++) { //loop for binary printing
+ printBinary(targetChar[h1]);
+ output.printf(" - ");
+ }
+ //output.printf("%d",sizeof(f));
+ // output.printf("\n The data to be analyzed is : ");
+ int frame[v+16];
+ for(h1=0; h1<v; h1++) { //storing the binary data in frame array
+ // output.printf("%d",binary1[h1]);
+ frame[h1]=binary1[h1];
+ }
+ //frame[2]=0;
+ /* output.printf("\n The value of v is : %d ",v); //Printing the value of V i.e total binary no.
+
+ output.printf("\n Sender Side:");
+ output.printf("\n Frame: ");*/
+ /* for(i1=0; i1<v; i1++) { // total binary stream printing
+ output.printf("%d",frame[i1]);
+ }
+ output.printf("\n Generator : "); */ // generator for CRC checking
+ /* for(i1=0; i1<16; i1++) {
+ output.printf("%d",generator[i1]);
+ }*/
+
+ //Append 0's
+ int rs1=16-1;
+ for (i1=v; i1<v+rs1; i1++) { //appending the zeros to the data for calculating the crc
+ frame[i1]=0;
+ }
+
+ int temp2[v+16];
+ for(i1=0; i1<v+16; i1++) { // copying the data from one array to another array
+ temp2[i1]=frame[i1];
+ }
+
+ /* output.printf("\n Message after appending 0's :");
+ for(i1=0; i1<v+rs1; i1++) { //printing the data after appending zeros
+ output.printf("%d",temp2[i1]);
+ }*/
+
+ //Division
+ for(i1=0; i1<v; i1++) { //CRC generating through division operation
+ j1=0;
+ k1=i1;
+ //check whether it is divisible or not
+ if (temp2[k1]>=generator[j1]) {
+ for(j1=0,k1=i1; j1<16; j1++,k1++) {
+ if((temp2[k1]==1 && generator[j1]==1) || (temp2[k1]==0 && generator[j1]==0)) {
+ temp2[k1]=0;
+ } else {
+ temp2[k1]=1;
+ }
+ }
+ }
+ }
+
+ //CRC
+ int crc[16];
+ for(i1=0,j1=v; i1<rs1; i1++,j1++) { // storing CRC bits in CRC array
+ crc[i1]=temp2[j1];
+ }
+
+ /*output.printf("\n CRC bits: ");
+ for(i1=0; i1<rs1; i1++) { //printing CRC bits
+ output.printf("%d",crc[i1]);
+ }*/
+
+ //output.printf("\n Transmitted Frame: ");
+ int tf2[v+16];
+ char tf3[v+16];
+ for(i1=0; i1<v; i1++) { // copying the data from one to another
+ tf2[i1]=frame[i1];
+ }
+ for(i1=v,j1=0; i1<v+rs1; i1++,j1++) { // Adding CRC bits to the data
+ tf2[i1]=crc[j1];
+ }
+ /* for(i1=0; i1<v+rs1; i1++) { // printing the data after adding the CRC bits to the data
+ output.printf("%d",tf2[i1]);
+ }*/
+
+ tf2[v+rs1]=0;
+
+ /* output.printf("\n The final data to be sent is : "); // printing the Final data
+ for(i1=0; i1<=v+rs1; i1++) {
+ output.printf("%d",tf2[i1]);
+ }*/
+
+ /* for(i1=0;i1<7;i1++)
+ {
+ tf2[i1]=1;
+ }
+ for(i1=136;i1<144;i1++)
+ {
+ tf2[i1]=1;
+ }*/
+ output.printf("\n The final data to be sent is : "); // printing the Final data
+ for(i1=0; i1<=v+rs1; i1++) {
+ output.printf("%d",tf2[i1]);
+ }
+ for(i1=0; i1<=v+rs1; i1++) {
+ charBinary(tf2[i1]);
+ }
+ /* output.printf("\n The final data to be sent is : ");
+ for(i1=0; i1<=v+rs1; i1++) {
+ output.printf("%c",binary2[i1]);
+ }*/
+ printChar(binary2);
+
+ char* str=result1;
+ //result1[18]='!';
+ output.printf("\n check %s ", str);
+ v=0,v1=0;
+ return result1;
+}
+
+
+
+//Function for CRC Checksum
+int crcCheck_receive(char a1[])
+{
+ int i,j,k,l; //Variable required for CRC checksum
+ int rs=15; //Value of should be N - 1 if the generator is of N bits
+ v=0;
+ /*output.printf("\n Receiver side : ");
+ output.printf("\n Received Frame: ");*/
+
+//For loop to convert the given data to binary form
+for(int m=0; m<18; m++) {
+ printBinary(a1[m]);
+ output.printf("-");
+ }
+
+ //For loop to print the binary form of the data
+ /* for(i=0; i<v; i++) {
+ output.printf("%d",binary1[i]);
+ }*/
+ v=v-16;
+ int tf[v+16]; //Variable to store the binsry form of the data
+
+ //For loop to store the bianry form of data into tf
+ for(i=0; i<v+rs; i++) {
+ tf[i]=binary1[i];
+ }
+
+ /* output.printf("\n");
+ output.printf("The data to be Analyzed on the receiving side : ");*/
+
+ //For loop to print the data to be analyzed
+ /*for(i=0; i<v+rs; i++) {
+ output.printf("%d",tf[i]);
+ }*/
+
+ int temp[v+16];
+ int temp2[v+16];
+ for(i=0; i<v+rs; i++) {
+ temp[i]=tf[i];
+ }
+ output.printf("\n The value before operation is :");
+for(i=0; i<v+rs; i++) {
+ output.printf("%d",temp[i]);
+ }
+ //Division
+ for(i=0; i<v; i++) {
+ j=0;
+ k=i;
+ if (temp[k]>=generator[j]) {
+ for(j=0,k=i; j<16; j++,k++) {
+ if(temp[k] == generator[j]) { //If the data bit and generator bit are same
+ temp[k]=0; //Result is 0
+ } else { //If the data bit and generator bit are not same
+ temp[k]=1; //Result is 1
+ }
+ }
+ }
+ }
+ output.printf("\n The value after operation is :");
+ for(i=0; i<v+rs; i++) {
+ output.printf("%d",temp[i]);
+ }
+ output.printf("\n Reaminder: ");
+ int rrem[16]; //Char array to store the remainder of the CRC checksum
+
+ //For loop to store the remainder
+ for (i=v,j=0; i<v+rs; i++,j++) {
+ rrem[j]= temp[i];
+ }
+
+ //For loop to print the remainder
+ for(i=0; i<rs; i++) {
+ output.printf("%d",rrem[i]);
+ }
+
+ int flag=0; //Variable to store the status of the flag
+
+ //For loop to check the remainder
+ for(i=0; i<rs; i++) {
+ if(rrem[i]!=0) { //If remainder bit is not equal to 0
+ flag=1; //Set the flag value as 1
+ break;
+ }
+ }
+
+ if(flag==0) { //if flag value is 0
+ //output.printf("\n Since Remainder Is 0 Hence Message Transmitted From Sender To Receriver Is Correct");
+ return 0; //Return 0
+
+
+ } else { //if flag value is not zero
+ // output.printf(" \n Since Remainder Is Not 0 Hence Message Transmitted From Sender To Receriver Contains Error");
+ return 1; //return 1
+ }
+ v=0;
+}
+
+//Function to print the binary format of the data which takes char c as a parameter
+void printBinary(char c)
+{
+
+ for (int i = 7; i >= 0; --i) {
+ int x = ((c & (1 << i))? 1 : 0);
+ output.printf("%d",x);
+ binary1[v]=x;
+ v++;
+ }
+}
+
+//Function to convertthe data from integer form to binary form which takes int c1 as parameter
+void charBinary(int c1)
+{
+ char x1 = ((c1 & 1)? '1' : '0');
+ // output.printf("%c",x1);
+ binary2[v1]=x1;
+ v1++;
+}
+
+
+/* ####### printChar function to convert the binary value into the respective character ########## */
+
+void printChar(char x2[])
+{
+
+ //memcpy(a, b, sizeof(a));
+ char *ON = x2 ;
+ output.printf("\n");
+ output.printf("%c",x2);
+ char subbuff[9];
+ for(int j=0; j<sizeof(result1); j++) {
+ result1[j]='\0';
+ }
+ unsigned char c3;
+ int k1;
+ int index = 0;
+ int fichero_len = (int)strlen(ON);
+
+ for(k1 = 0; k1 < fichero_len; k1 += 8) {
+ memcpy(subbuff, &ON[k1], 8); // <--- copy 8 butes only
+ subbuff[8] = '\0';
+ c3 = (unsigned char)strtol(subbuff, 0, 2);
+ //printf("\%s = %c = %d = 0x%.2X\n", subbuff, c3, c3, c3);
+ result1[index++] = c3;
+ result1[index] = '\0';
+ }
+ printf("\nResult = %s\n", result1);
+
+}
+