evm5509_flash_checksum.c

来自「dsp 5509a MMC 卡 ID号读取 12Mhzx16=192M」· C语言 代码 · 共 31 行

/*
 *  Copyright 2002 by Spectrum Digital Incorporated.
 *  All rights reserved. Property of Spectrum Digital Incorporated.
 */

/*
 *  ======== evm5509_flash_checksum.c ========
 *  EVM5509_FLASH_checksum() implementation
 */
 
#include <std.h>
#include <csl.h>

#include <evm5509.h>
#include <evm5509_flash.h>

/* Calculate the checksum of a data range in Flash */
Uint32 EVM5509_FLASH_checksum(Uint32 start, Uint32 length)
{
    Uint32 i, checksum;
    
    /* Calculate checksum by adding each word to the total */
    checksum = 0;
    for (i = 0; i < length; i++)
    {
        checksum += EVM5509_mget(start++);
    }
    
    return checksum;
}