325 lines
11 KiB
C
325 lines
11 KiB
C
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/**
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* \file
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* EEPROM functions.
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* \author Adam Dunkels <adam@sics.se>
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*/
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/* Copyright (c) 2004 Swedish Institute of Computer Science.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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* OF SUCH DAMAGE.
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*
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* $Id: eeprom.c,v 1.1 2006/06/18 07:49:33 adamdunkels Exp $
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*
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* Author: Adam Dunkels <adam@sics.se>
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*
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*/
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/*
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Copyright 2003/2004, Freie Universitaet Berlin. All rights reserved.
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These sources were developed at the Freie Universit\x{FFFF}t Berlin, Computer
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Systems and Telematics group.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are
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met:
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- Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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- Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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- Neither the name of Freie Universitaet Berlin (FUB) nor the names of its
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contributors may be used to endorse or promote products derived from
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this software without specific prior written permission.
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This software is provided by FUB and the contributors on an "as is"
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basis, without any representations or warranties of any kind, express
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or implied including, but not limited to, representations or
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warranties of non-infringement, merchantability or fitness for a
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particular purpose. In no event shall FUB or contributors be liable
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for any direct, indirect, incidental, special, exemplary, or
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consequential damages (including, but not limited to, procurement of
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substitute goods or services; loss of use, data, or profits; or
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business interruption) however caused and on any theory of liability,
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whether in contract, strict liability, or tort (including negligence
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or otherwise) arising in any way out of the use of this software, even
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if advised of the possibility of such damage.
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This implementation was developed by the CST group at the FUB.
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Contributors: Thomas Pietsch, Bjoern Lichtblau
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For documentation and questions please use the web site
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http://www.scatterweb.net and the mailinglist
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scatterweb@lists.spline.inf.fu-berlin.de (subscription via the Website).
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Berlin, 2003/2004
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*/
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#include <msp430x14x.h>
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#include <io.h>
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#include "dev/eeprom.h"
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/* Temporary switch for the eeprom address. */
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#define EEPROMADDRESS (0x00) /* use 8k EEPROM, future versions will have only one 64k eeprom at this address */
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/*#define EEPROMADDRESS (0x02)*/ /* use 64k EEPROM */
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/* must be set together with EEPROMADDRESS */
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/*#define EEPROMPAGEMASK (0x1F) */ /* 8k EEPROM, 32b page writes possible */
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#define EEPROMPAGEMASK (0x7F) /* 64k EEPROM, 128b page writes possible */
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/*
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* Macros for accessing the clock and data lines. Data is on P56 and
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* clock on P57.
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*/
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#define SDA_HIGH (P5OUT |= 0x04) /**< EEPROM data line high */
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#define SDA_LOW (P5OUT &= 0xFB) /**< EEPROM data line low */
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#define SCL_HIGH (P5OUT |= 0x08) /**< EEPROM clock line high */
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#define SCL_LOW (P5OUT &= 0xF7) /**< EEPROM clock line low */
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/*-----------------------------------------------------------------------------------*/
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/**
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* \internal \name Basic functions for interfacing the i2c-like EEPROM bus.
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*/
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/** @{ */
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/**
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* \internal
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* Put start condition on the bus.
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*/
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static void
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start(void)
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{
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P5DIR |= 0x0C; /* ensure: P52(SDA), P53(SCL) output */
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SCL_LOW; _NOP(); _NOP();
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SDA_HIGH; _NOP(); _NOP();
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SCL_HIGH; _NOP(); _NOP();
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SDA_LOW; _NOP(); _NOP();
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SCL_LOW; _NOP(); _NOP();
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}
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/*-----------------------------------------------------------------------------------*/
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/**
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* \internal
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* Put stop condition on the bus.
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*/
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static void
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stop(void)
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{
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//P5DIR |= 0x0C; /* ensure: P52(SDA), P53(SCL) output */
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SCL_LOW; _NOP(); _NOP();
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SDA_LOW; _NOP(); _NOP();
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SCL_HIGH; _NOP(); _NOP();
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SDA_HIGH; _NOP(); _NOP();
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SCL_LOW; _NOP(); _NOP();
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P5DIR &= ~0x0C;
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}
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/*-----------------------------------------------------------------------------------*/
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/**
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* \internal
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* Write a byte on the bus, return the acknowledge bit.
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*/
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static int
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write_bus(unsigned char byte)
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{
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int i, ack;
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/* Write byte, one bit at a time. Start with the leftmost (most
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significant) bit and roll in bits from the right. */
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for(i = 0; i < 8; ++i) {
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if(byte & 0x80) {
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SDA_HIGH;
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} else {
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SDA_LOW;
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}
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_NOP();
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_NOP();
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SCL_HIGH;
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_NOP();
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_NOP();
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byte = byte << 1;
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SCL_LOW;
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_NOP();
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_NOP();
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}
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/* check ack */
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P5DIR &= 0xFB; /* P52(SDA) input */
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SCL_HIGH;
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_NOP();
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_NOP();
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if(P5IN & 0x04) {
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ack = 0;
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} else {
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ack = 1; /* test if ack=0, else error */
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}
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SCL_LOW;
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_NOP();
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_NOP();
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P5DIR |= 0x04; /* P52(SDA) output */
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_NOP();
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_NOP();
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_NOP();
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return ack;
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}
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/*-----------------------------------------------------------------------------------*/
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/**
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* \internal
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* Read one byte from the bus.
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*
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* \param ack If set, the ackbit after the received byte will be set.
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*/
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static unsigned char
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read_bus(unsigned char ack)
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{
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int i;
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unsigned char byte = 0;
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P5DIR &= 0xFB; /* P52(SDA) input */
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for(i = 0; i < 8; ++i) {
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byte = byte << 1;
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SCL_HIGH;
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_NOP();
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_NOP();
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if(P5IN & 0x04) {
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byte |= 0x01;
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} else {
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byte &= 0xFE;
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}
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_NOP();
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SCL_LOW;
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_NOP();
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_NOP();
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}
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P5DIR |= 0x04; /* P52(SDA) output */
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if(ack) {
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SDA_LOW;
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} else {
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SDA_HIGH;
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}
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_NOP();
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SCL_HIGH;
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_NOP();
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SCL_LOW;
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_NOP();
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return byte;
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}
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/** @} */
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/*-----------------------------------------------------------------------------------*/
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/**
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* Read bytes from the EEPROM using sequential read.
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*/
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void
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eeprom_read(unsigned short addr, unsigned char *buf, int size)
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{
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unsigned int i;
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if(size <= 0) {
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return;
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}
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do {
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/* Wait if the writecycle has not finished. */
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start();
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/* 1010 control, 000 address, 0=write --- but only inits address */
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} while(!write_bus(0xa0 | EEPROMADDRESS));
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/* Write address to bus, low byte first. */
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write_bus(addr >> 8);
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write_bus(addr & 0xff);
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start();
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/* 1010 control, 000 address, 1=read */
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write_bus(0xa1 | EEPROMADDRESS);
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for(i = 0; i < (size - 1); ++i){
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buf[i] = read_bus(1);
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}
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buf[size - 1] = read_bus(0);
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stop();
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}
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/*-----------------------------------------------------------------------------------*/
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/**
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* Write bytes to EEPROM using sequencial write.
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*/
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void
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eeprom_write(unsigned short addr, unsigned char *buf,
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int size)
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{
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unsigned int i = 0;
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unsigned int curaddr;
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if(size <= 0) {
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return;
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}
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/* Disable write protection. */
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P5OUT &= 0xEF;
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curaddr = addr;
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for(i = 0; i < size; ++i) {
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/* If we are writing the first byte or are on a 128b page boundary
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we have to start a new write. */
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if(i == 0 || (curaddr & EEPROMPAGEMASK) == 0) {
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do {
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start();
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/* 1010 control, 000 addresse, 0=write */
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} while(!write_bus(0xa0 | EEPROMADDRESS));
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/* Write the new address to the bus. */
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if(write_bus(curaddr >> 8) == 0) {
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return;
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}
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if(write_bus(curaddr) == 0) {
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return;
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}
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}
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/* Write byte. */
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if(write_bus(buf[i]) == 0) {
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return;
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}
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/* If we are writing the last byte totally or of a 128b page
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generate a stop condition */
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if(i == size - 1 || (curaddr & EEPROMPAGEMASK) == EEPROMPAGEMASK) {
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stop();
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}
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++curaddr;
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}
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/* Enable write protection. */
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P5OUT |= 0x10;
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}
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/*-----------------------------------------------------------------------------------*/
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