nvramtoflash.c

ARM7开发板 AT91EB01 BSP源代码

/* nvRamToFlash.c - non-volatile RAM to FLASH memory routine mapping */

/* Copyright 1994-1998 Wind River Systems, Inc. */
#include "copyright_wrs.h"

/*
modification history
--------------------
01d,03apr98,cdp  copied to BSP with mods to use end of boot device as NVRAM.
01c,14nov96,wlf  doc: cleanup.
01b,31jan96,dzb  added NV_BOOT_OFFSET and NV_RAM_SIZE checking.  Added EOS.
01a,08jan94,dzb  created.
*/

/*
DESCRIPTION
This library contains non-volatile RAM manipulation routines for targets
lacking non-volatile RAM, but that do have FLASH memory.  Read and write
wrappers are provided for the FLASH memory routines sysFlashGet() and
sysFlashSet().
*/

/* includes */

#include "drv/mem/memDev.h"
#include "drv/mem/flashDev.h"

/******************************************************************************
*
* sysNvRamGet - get the contents of non-volatile RAM
*
* This routine calls sysFlashGet() to copy the contents of flash memory
* into a specified string.  The string is terminated with an EOS.
*
* RETURNS: The return value of sysFlashGet().
*
* SEE ALSO: sysNvRamSet(), sysFlashGet()
*/

STATUS sysNvRamGet
    (
    char *string,    /* where to copy non-volatile RAM    */
    int strLen,      /* maximum number of bytes to copy   */
    int offset       /* byte offset into non-volatile RAM */
    )
    {
    STATUS retVal;

    if ((offset < 0) || (strLen < 0) || ((offset + strLen) > NV_RAM_SIZE))
        return (ERROR);

    retVal = sysFlashGet (string, strLen, offset + FLASH_NV_RAM_OFFSET);
    string [strLen] = EOS;

    return (retVal);
    }

/*******************************************************************************
*
* sysNvRamSet - write to non-volatile RAM
*
* This routine calls sysFlashSet() to copy a specified string into
* flash memory.
*
* RETURNS: The return value of sysFlashSet().
*
* SEE ALSO: sysNvRamGet(), sysFlashSet()
*/

STATUS sysNvRamSet
    (
    char *string,     /* string to be copied into non-volatile RAM */
    int strLen,       /* maximum number of bytes to copy           */
    int offset        /* byte offset into non-volatile RAM         */
    )
    {
    if ((offset < 0) || (strLen < 0) || ((offset + strLen) > NV_RAM_SIZE))
        return (ERROR);

    return (sysFlashSet (string, strLen, offset + FLASH_NV_RAM_OFFSET));
    }