Mercurial > public > ostc4
view ostc4pack/src/checksum_final_add_fletcher.cpp @ 302:eba8d1eb5bef cleanup-4
bugfix, cleanup: keep both is_ambient_pressure_close_to_surface in sync
The CPU1 firmware used 40cm of water pressure, and the RTE used 1m of
water pressure to detect between diving and surface state. This is
simply wrong, and can lead to small, rounding like, errors.
Use 1m water pressure as "official" depth things count as diving.
Signed-off-by: Jan Mulder <jlmulder@xs4all.nl>
author | Jan Mulder <jlmulder@xs4all.nl> |
---|---|
date | Mon, 20 May 2019 10:13:44 +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); }