param.c

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/*! \file param.c \brief EEPROM Parameter Storage Library. */
//*****************************************************************************
//
// File Name    : 'param.c'
// Title        : EEPROM Parameter Storage Library
// Author       : Pascal Stang (c)2005
// Created      : 9/16/2005
// Revised      : 9/20/2005
// Version      : 0.1
// Target MCU   : Atmel AVR series
// Editor Tabs  : 4
//
//*****************************************************************************

#include "global.h"

#include "i2ceeprom.h"

void eeprom_read_block(u08* data, u08* memaddr, u16 sizebytes)
{
    int i;

    for(i=0; i<sizebytes; i++)
    {
        *data++ = i2ceepromReadByte(0xA0, (u32)memaddr++);
    }
}

void eeprom_write_block(u08* data, u08* memaddr, u16 sizebytes)
{
    int i;

    for(i=0; i<sizebytes; i++)
    {
        i2ceepromWriteByte(0xA0, (u32)memaddr++, *data++);
    }
}

u08 paramLoad(u08* parameters, u08* memaddr, u16 sizebytes)
{
    u16 i;
    u08 checksum_stored=0;
    u08 checksum=0;

    // load parameters
    eeprom_read_block(parameters, memaddr, sizebytes);
    // load checksum
    eeprom_read_block(&checksum_stored, memaddr+sizebytes, sizeof(u08));

    // calculate own checksum
    for(i=0;i<sizebytes;i++)
        checksum += parameters[i];
    checksum = ~checksum;
    
    if(checksum == checksum_stored)
        return TRUE;
    else
        return FALSE;
}

void paramStore(u08* parameters, u08* memaddr, u16 sizebytes)
{
    u16 i;
    u08 checksum=0;

    // calculate checksum
    for(i=0;i<sizebytes;i++)
        checksum += parameters[i];
    checksum = ~checksum;

    // store parameters
    eeprom_write_block(parameters, memaddr, sizebytes);
    // store checksum
    eeprom_write_block(&checksum, memaddr+sizebytes, sizeof(u08));
}

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