library

/*! \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 <avr/eeprom.h>

#include "global.h"

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));
}