haleep.c

一个免费的SMART CARD OS系统。

/* ============================================================================
   Project Name : jayaCard
   Module Name  : proto/hal/avr/haleep.c
   Version : $Id: haleep.c,v 1.3 2004/01/11 09:56:32 dgil Exp $

	Description:

 		EEPROM read/write of byte/word/buffer

    The Original Code is jayaCard code.

    The Initial Developer of the Original Code is Gilles Dumortier.

	Portions created by the Initial Developer are Copyright (C) 2002-2004 the
    Initial Developer. All Rights Reserved.

    Contributor(s):

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; see http://www.gnu.org/licenses/gpl.html

   History Rev	Description
   073103 dgil	wrote it from scratch
   ============================================================================
*/

#include "precomp.h"

/* =========================================================================
	__hal_eeprom_read_byte()

	Read a single byte from the EEPROM

	!this is an unsecure version! BIOS will handle the security around this
	primitive
   ========================================================================= */

jbyte __hal_eeprom_read_byte(jword src)
{
	while( !eeprom_is_ready() ) {}

	return eeprom_rb(src);
}

/* =========================================================================
	__hal_eeprom_read_word()

	Read a word from the EEPROM

	!this is an unsecure version! BIOS will handle the security around this
	primitive
   ========================================================================= */

jword __hal_eeprom_read_word(jword src)
{
	LOCAL(jbyte,b);

	while( !eeprom_is_ready() ) {}

	b = eeprom_rb(src);

	while( !eeprom_is_ready() ) {}

	return ( ((jword)b)| (((jword)eeprom_rb(src))<<8) );
}

/* =========================================================================
	__hal_eeprom_read()

	Read a buffer from the EEPROM

	!this is an unsecure version! BIOS will handle the security around this
	primitive
   ========================================================================= */

void __hal_eeprom_read(jbyte xdata* dest, jword src,jbyte len)
{
	while( len-- ) {
		while( !eeprom_is_ready() ) {}

		*dest++ = eeprom_rb( src++ );
	}
}

/* =========================================================================
	__hal_eeprom_write_byte()

	Write a single byte to the EEPROM. Returns EEPROM_HAL_OK if the write was
	successful, EEPROM_HAL_ERROR otherwise.

	Note that this primitive *can* write to write-once and OTP areas

	!this is an unsecure version! BIOS will handle the security around this
	primitive
   ========================================================================= */

jbyte __hal_eeprom_write_byte(jword dest,jbyte val)
{
	while( !eeprom_is_ready() ) {}

	eeprom_wb( dest, val );

	return EEPROM_HAL_OK;
}

/* =========================================================================
	__hal_eeprom_write_word()

	Write a word to the EEPROM. Returns EEPROM_HAL_OK if the write was
	successful, EEPROM_HAL_ERROR otherwise.

	Note that this primitive *can* write to write-once and OTP areas

	!this is an unsecure version! BIOS will handle the security around this
	primitive
   ========================================================================= */

jbyte __hal_eeprom_write_word(jword dest,jword w)
{
	while( !eeprom_is_ready() ) {}

	eeprom_wb( dest, LOBYTE(w) );
	dest++;

	while( !eeprom_is_ready() ) {}

	eeprom_wb( dest, HIBYTE(w) );

	return EEPROM_HAL_OK;
}

/* =========================================================================
	__hal_eeprom_write()

	Write a buffer to the EEPROM. Returns EEPROM_HAL_OK if the write was
	successful, EEPROM_HAL_ERROR otherwise.

	Note that this primitive *can* write to write-once and OTP areas

	!this is an unsecure version! BIOS will handle the security around this
	primitive
   ========================================================================= */

jbyte __hal_eeprom_write(jword dest, jbyte xdata* src,jbyte len)
{
	while( len-- ) {

		while( !eeprom_is_ready() ) {}

		eeprom_wb( dest++, *src++ );

	}

	return EEPROM_HAL_OK;
}

/* =========================================================================
	That's all folks !
   ========================================================================= */