Mercurial > public > ostc4
view ostc4pack/src/checksum_final_add_fletcher.cpp @ 264:b3685fbada3b IPC_Sync_Improvment_2
Sync to Main 100ms time stamp & added Reinitialization of globals after startup
Added function to synchronize RTE to the timestamp provided by Main 100ms callback. This was introduced to compensated small shifts in execution and program flow shifts (for example during long operation times)
author | ideenmodellierer |
---|---|
date | Sun, 14 Apr 2019 11:43:29 +0200 |
parents | 1e707b34667e |
children | 01f40cb1057e |
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#include <iostream> #include <stdlib.h> #include <stdio.h> #include <string.h> #include <time.h> void fletcher16(unsigned char *result1, unsigned char *result2, unsigned char const *data, size_t bytes ) { unsigned short sum1 = 0xff, sum2 = 0xff; size_t tlen; while (bytes) { tlen = bytes >= 20 ? 20 : bytes; bytes -= tlen; do { sum2 += sum1 += *data++; } while (--tlen); sum1 = (sum1 & 0xff) + (sum1 >> 8); sum2 = (sum2 & 0xff) + (sum2 >> 8); } /* Second reduction step to reduce sums to 8 bits */ sum1 = (sum1 & 0xff) + (sum1 >> 8); sum2 = (sum2 & 0xff) + (sum2 >> 8); *result2 = (sum2 & 0xff); *result1 = (sum1 & 0xff); // return sum2 << 8 | sum1; } // This is a variant of fletcher16 with a 16 bit sum instead of an 8 bit sum, // and modulo 2^16 instead of 2^16-1 void hw_ostc3_firmware_checksum (unsigned char *result1, unsigned char *result2, unsigned char *result3, unsigned char *result4, unsigned char const *data, size_t bytes ) { unsigned short low = 0; unsigned short high = 0; for (unsigned int i = 0; i < bytes; i++) { low += data[i]; high += low; } *result1 = (low & 0xff); *result2 = (low/256 & 0xff); *result3 = (unsigned char)(high & 0xff); *result4 = (unsigned char)((high/256) & 0xff); // return (((unsigned int)high) << 16) + low; } int main(int argc, char** argv) { FILE *fp, * fpout; size_t lenTotal,lenTemp; unsigned char buf[2000000]; char *file = argv[1]; char *file2 = argv[2]; char *file3 = argv[3]; unsigned int pruefsumme; unsigned char buf2[4]; printf("1: %s\n", file); printf("2: %s\n", file2); printf("3: %s\n", file3); printf("\n"); //write File with length and cheksum char filename[500], filenameout[510] ; sprintf(filename,"%s",file); int filelength = strlen(filename); filename[filelength -4] = 0; lenTotal = 0; if (NULL == (fp = fopen(file, "rb"))) { printf("Unable to open %s for reading\n", file); return -1; } lenTemp = fread(&buf[lenTotal], sizeof(char), sizeof(buf), fp); // lenTemp = fread(buf, sizeof(char), sizeof(buf), fp); lenTotal = lenTemp; printf("%d bytes read (hex: %#x )\n", lenTemp,lenTemp); fclose(fp); if(file2) { if (NULL == (fp = fopen(file2, "rb"))) { printf("Unable to open %s for reading\n", file2); return -1; } lenTemp = fread(&buf[lenTotal], sizeof(char), sizeof(buf)-lenTotal, fp); lenTotal += lenTemp; printf("%d bytes read (hex: %#x )\n", lenTemp,lenTemp); fclose(fp); } if(file3) { if (NULL == (fp = fopen(file3, "rb"))) { printf("Unable to open %s for reading\n", file3); return -1; } lenTemp = fread(&buf[lenTotal], sizeof(char), sizeof(buf)-lenTotal, fp); lenTotal += lenTemp; printf("%d bytes read (hex: %#x )\n", lenTemp,lenTemp); fclose(fp); } printf("\n"); printf("%d bytes read (hex: %#x ) total \n", lenTotal,lenTotal); time_t rawtime; time (&rawtime); struct tm *timeinfo; timeinfo = localtime(&rawtime); // sprintf(filenameout,"fwupdate_%s.bin",ctime(&rawtime)); sprintf(filenameout,"OSTC4update_%02u%02u%02u.bin",timeinfo->tm_year-100,timeinfo->tm_mon+1,timeinfo->tm_mday); fpout = fopen(filenameout, "wb"); for(int i = 0;i <lenTotal;i++) { if(fwrite(&buf[i],1,1,fpout) != 1) printf("error writing\n"); } hw_ostc3_firmware_checksum(&buf2[0],&buf2[1],&buf2[2],&buf2[3],buf,lenTotal); printf("checksum %#x %#x %#x %#x\n", buf2[0],buf2[1], buf2[2], buf2[3]); if(fwrite(&buf2[0],1,4,fpout) != 4) printf("error writing checksum\n"); ; fclose(fpout); }