?? ecc sample source code for 512 byte.txt
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/*****************************************************************************/
/* */
/* PROJECT : SAMSUNG ECC */
/* FILE : SAMSUNG_ECC.c */
/* PURPOSE : This file implements core ECC algorithms adopted */
/* Hamming Error Correction and Detection Algorithm */
/* */
/*---------------------------------------------------------------------------*/
/* */
/* COPYRIGHT 2000-2004, SAMSUNG ELECTRONICS CO., LTD. */
/* ALL RIGHTS RESERVED */
/* */
/* Permission is hereby granted to licensees of Samsung Electronics */
/* Co., Ltd. products to use or abstract this computer program for the */
/* sole purpose of implementing a product based on Samsung */
/* Electronics Co., Ltd. products. No other rights to reproduce, use, */
/* or disseminate this computer program, whether in part or in whole, */
/* are granted. */
/* */
/* Samsung Electronics Co., Ltd. makes no representation or warranties */
/* with respect to the performance of this computer program, and */
/* specifically disclaims any responsibility for any damages, */
/* special or consequential, connected with the use of this program. */
/* */
/*---------------------------------------------------------------------------*/
/* */
/* REVISION HISTORY */
/* */
/* 13-NOV-2003 [Chang JongBaek] : first writing */
/* 03-MAR-2004 [ Kim YoungGon ] : Second writing */
/* 03-MAR-2004 [ Lee JaeBum ] : Third writing */
/*---------------------------------------------------------------------------*/
/* */
/* NOTES */
/* */
/* - Make ECC parity code of 512bytes(256words) and 3 bytes are represented */
/* And ECC compare & Correction code is also represented */
/* */
/*****************************************************************************/
#include <stdio.h>
#include <conio.h>
#include <stdlib.h>
#include <string.h>
#include "ecc.h"
#define XMODE 8
/*****************************************************************************/
/* Address Types */
/*****************************************************************************/
typedef unsigned char * address_t; /* address (pointer) */
typedef unsigned long address_value_t; /* address (for calculation) */
/*****************************************************************************/
/* Integer Types */
/*****************************************************************************/
typedef unsigned long uint32_t; /* unsigned 4 byte integer */
typedef signed long int32_t; /* signed 4 byte integer */
typedef unsigned short uint16_t; /* unsigned 2 byte integer */
typedef signed short int16_t; /* signed 2 byte integer */
typedef unsigned char uint8_t; /* unsigned 1 byte integer */
typedef signed char int8_t; /* signed 1 byte integer */
typedef enum {
ECC_NO_ERROR = 0, /* no error */
ECC_CORRECTABLE_ERROR = 1, /* one bit data error */
ECC_ECC_ERROR = 2, /* one bit ECC error */
ECC_UNCORRECTABLE_ERROR = 3 /* uncorrectable error */
} eccdiff_t;
/*****************************************************************************/
/* */
/* NAME */
/* make_ecc_512 */
/* DESCRIPTION */
/* This function generates 3 byte ECC for 512 byte data. */
/* (Software ECC) */
/* PARAMETERS */
/* ecc_buf the location where ECC should be stored */
/* data_buf given data */
/* RETURN VALUES */
/* none */
/* */
/*****************************************************************************/
#if (XMODE == 8)
void make_ecc_512(uint8_t * ecc_buf, uint8_t * data_buf)
#else
void make_ecc_512(uint16_t * ecc_buf, uint16_t * data_buf)
#endif
{
uint32_t i, ALIGN_FACTOR;
uint32_t tmp;
uint32_t uiparity = 0;
uint32_t parityCol, ecc = 0;
uint32_t parityCol4321 = 0, parityCol4343 = 0, parityCol4242 = 0, parityColTot = 0;
uint32_t *Data;
uint32_t Xorbit=0;
ALIGN_FACTOR = (uint32_t)data_buf % 4 ;
Data = (uint32_t *)(data_buf + ALIGN_FACTOR);
for( i = 0; i < 16; i++)
{
parityCol = *Data++;
tmp = *Data++; parityCol ^= tmp; parityCol4242 ^= tmp;
tmp = *Data++; parityCol ^= tmp; parityCol4343 ^= tmp;
tmp = *Data++; parityCol ^= tmp; parityCol4343 ^= tmp; parityCol4242 ^= tmp;
tmp = *Data++; parityCol ^= tmp; parityCol4321 ^= tmp;
tmp = *Data++; parityCol ^= tmp; parityCol4242 ^= tmp; parityCol4321 ^= tmp;
tmp = *Data++; parityCol ^= tmp; parityCol4343 ^= tmp; parityCol4321 ^= tmp;
tmp = *Data++; parityCol ^= tmp; parityCol4242 ^= tmp; parityCol4343 ^= tmp; parityCol4321 ^= tmp;
parityColTot ^= parityCol;
tmp = (parityCol >> 16) ^ parityCol;
tmp = (tmp >> 8) ^ tmp;
tmp = (tmp >> 4) ^ tmp;
tmp = ((tmp >> 2) ^ tmp) & 0x03;
if ((tmp == 0x01) || (tmp == 0x02))
{
uiparity ^= i;
Xorbit ^= 0x01;
}
}
#if (XMODE == 8)
tmp = (parityCol4321 >> 16) ^ parityCol4321;
tmp = (tmp << 8) ^ tmp;
tmp = (tmp >> 4) ^ tmp;
tmp = (tmp >> 2) ^ tmp;
ecc |= ((tmp << 1) ^ tmp) & 0x200; // p128
#else
tmp = (parityCol4321 >> 16) ^ parityCol4321;
tmp = (tmp >> 8) ^ tmp;
tmp = (tmp << 4) ^ tmp;
tmp = (tmp << 2) ^ tmp;
ecc |= ((tmp << 1) ^ tmp) & 0x80; // p128
#endif
#if (XMODE == 8)
tmp = (parityCol4343 >> 16) ^ parityCol4343;
tmp = (tmp >> 8) ^ tmp;
tmp = (tmp << 4) ^ tmp;
tmp = (tmp << 2) ^ tmp;
ecc |= ((tmp << 1) ^ tmp) & 0x80; // p64
#else
tmp = (parityCol4343 >> 16) ^ parityCol4343;
tmp = (tmp >> 8) ^ tmp;
tmp = (tmp << 4) ^ tmp;
tmp = (tmp >> 2) ^ tmp;
ecc |= ((tmp << 1) ^ tmp) & 0x20; // p64
#endif
#if (XMODE == 8)
tmp = (parityCol4242 >> 16) ^ parityCol4242;
tmp = (tmp >> 8) ^ tmp;
tmp = (tmp << 4) ^ tmp;
tmp = (tmp >> 2) ^ tmp;
ecc |= ((tmp << 1) ^ tmp) & 0x20; // p32
#else
tmp = (parityCol4242 >> 16) ^ parityCol4242;
tmp = (tmp >> 8) ^ tmp;
tmp = (tmp >> 4) ^ tmp;
tmp = (tmp << 2) ^ tmp;
ecc |= ((tmp << 1) ^ tmp) & 0x08; // p32
#endif
#if (XMODE == 8)
tmp = parityColTot & 0xFFFF0000;
tmp = tmp >> 16;
tmp = (tmp >> 8) ^ tmp;
tmp = (tmp >> 4) ^ tmp;
tmp = (tmp << 2) ^ tmp;
ecc |= ((tmp << 1) ^ tmp) & 0x08; // p16
#else
tmp = parityColTot & 0xFFFF0000;
tmp = tmp >> 16;
tmp = (tmp >> 8) ^ tmp;
tmp = (tmp >> 4) ^ tmp;
tmp = (tmp >> 2) ^ tmp;
ecc |= ((tmp << 1) ^ tmp) & 0x02; // p16
#endif
#if (XMODE == 8)
tmp = parityColTot & 0xFF00FF00;
tmp = (tmp >> 16) ^ tmp;
tmp = (tmp >> 8);
tmp = (tmp >> 4) ^ tmp;
tmp = (tmp >> 2) ^ tmp;
ecc |= ((tmp << 1) ^ tmp) & 0x02; // p8
#else
tmp = parityColTot & 0xFF00FF00;
tmp = (tmp << 16) ^ tmp;
tmp = (tmp >> 8);
tmp = (tmp << 4) ^ tmp;
tmp = (tmp << 2) ^ tmp;
ecc |= ((tmp << 1) ^ tmp) & 0x800000; // p8
#endif
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