view ostc4pack/src/checksum_final_add_fletcher.cpp @ 917:0d6c4b40fae4 Evo_2_23

Bugfix external interface power up after sleep: The previous implementation did not consider if the external power was enabled of not before sleep (the power was later enabled by sensor handling). The power is now activated immediatly after leaving sleep in order to aoid delays in sensor startup.
author Ideenmodellierer
date Sun, 03 Nov 2024 15:37:00 +0100 (5 weeks ago)
parents 01f40cb1057e
children
line wrap: on
line source
#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", (uint32_t)lenTemp, (uint32_t)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", (uint32_t)lenTemp, (uint32_t)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", (uint32_t)lenTemp, (uint32_t)lenTemp);
		fclose(fp);
	}

   	printf("\n");
	printf("%d bytes read (hex: %#x ) total \n", (uint32_t)lenTotal, (uint32_t)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);
}