📄 ecc.c
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/*************************************************************************Title: Filename: $Header:$Hardware: MX21Summay:License: The contents of this file are subject to the Mozilla Public License Version 1.1 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.mozilla.org/MPL/Author: ====================Change Log========================$Log:$********************************************************************************////@ingroup NAND_BOOTLOADER///@file ecc.c///@brief ECC interface for data read/write.//////@remark/////////@bug///@version $Version$ //<<<<<Include#include "uart.h"#include "nand_ecc.c"//>>>>>Include//<<<<<< Private Macro//>>>>>> Private Macro//<<<<<< Private Structurestruct nand_oob_config { int ecc_pos[6]; int badblock_pos; int eccvalid_pos;};//>>>>>> Private Structure//<<<<<< Global Variablestatic struct nand_oob_config oob_config;static int oobblock = 512;//>>>>>> Global Variable//<<<<<Private Function Declearation//>>>>>Private Function Declearation//<<<<<Body/* ecc init function */void ecc_init(){ oob_config.ecc_pos[0] = 0; oob_config.ecc_pos[1] = 1; oob_config.ecc_pos[2] = 2; oob_config.ecc_pos[3] = 3; oob_config.ecc_pos[4] = 6; oob_config.ecc_pos[5] = 7; oob_config.badblock_pos = 5; oob_config.eccvalid_pos = 4;}/* ecc handle interface after read a page */void mx2_read_ecc( char* buff, char* para , int page){ char main_buf[512]; char oob_buf[16]; char ecc_code[6]; int i; char* p1 = buff; char* p2 = para; unsigned char ecc_calc[6]; /* Write the ecc_pos for 8 bit nand flash with 16 byte oob size */ ecc_init(); /* Copy the main buffer and para buff into array */ for( i = 0; i < 512; i++ ) main_buf[i] = *p1++; for( i = 0; i < 16; i++ ) oob_buf[i] = *p2++; /* Pick the ECC bytes out of the oob data */ for( i = 0; i < 6; i++ ) ecc_code[i] = oob_buf[oob_config.ecc_pos[i]]; /* Calculate the ECC and verify it */ /* If block was not written with ECC, skip ECC */ if (oob_config.eccvalid_pos != -1 && (ecc_code[oob_config.eccvalid_pos] & 0x0f) != 0x0f) { nand_calculate_ecc (&main_buf[0], &ecc_calc[0]); switch (nand_correct_data (&main_buf[0],&ecc_code[0], &ecc_calc[0])) { case -1: break; case 1: case 2: /* transfer ECC corrected data to cache */ for(i=0,p1=buff;i<256;i++) *p1++ = main_buf[i]; break; } } /* Calculate the ECC for upper 256 bytes of data in this page */ /* Has some problem need resolved. So, just ignore the output */ if (oob_config.eccvalid_pos != -1 && oobblock == 512 && (ecc_code[oob_config.eccvalid_pos] & 0xf0) != 0xf0) { nand_calculate_ecc (&main_buf[256],&ecc_calc[3]); switch (nand_correct_data (&main_buf[256],&ecc_code[3], &ecc_calc[3])) { case -1: break; case 1: case 2: /* transfer ECC corrected data to cache */ if (buff) for(i=0,p1=buff+256;i<256;i++) *p1++ = main_buf[256+i]; break; } }}/* ecc handle interface before write a page */void mx2_write_ecc( char* buff, char* para, int last ){ char main_buf[512]; char oob_buf[16]; char ecc_code[6]; int i; char* p1 = buff; char* p2 = para; /* Write the ecc_pos for 8 bit nand flash with 16 byte oob size */ ecc_init(); /* Zero out the ECC array */ for(i=0; i<6; i++) ecc_code[i] = 0x00; /* pad oob area */ for(i=0;i < 16; i++) oob_buf[i] = 0xff; /* Copy the main buffer into array */ for( i = 0; i < 512; i++ ) main_buf[i] = *p1++; /* Calculate and write the ECC if we have enough data */ if ((last >= 256)) { nand_calculate_ecc (&main_buf[0], &(ecc_code[0])); for (i=0 ; i<3 ; i++) oob_buf[oob_config.ecc_pos[i]] = ecc_code[i]; if (oob_config.eccvalid_pos != -1) oob_buf[oob_config.eccvalid_pos] = 0xf0; } /* Calculate and write the second ECC if we have enough data */ if ((oobblock == 512) && (last == oobblock)) { nand_calculate_ecc (&main_buf[256], &(ecc_code[3])); for (i=3 ; i<6 ; i++) oob_buf[oob_config.ecc_pos[i]] = ecc_code[i]; if (oob_config.eccvalid_pos != -1) oob_buf[oob_config.eccvalid_pos] &= 0x0f; } for(i=0;i<16;i++) *p2++ = oob_buf[i];}//>>>>>Body⌨️ 快捷键说明
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