library

/*! \file spieeprom.c \brief Interface for standard SPI EEPROM memories. */
//*****************************************************************************
//
// File Name    : 'spieeprom.c'
// Title                : Interface for standard SPI EEPROM memories
// Author               : Pascal Stang - Copyright (C) 2004
// Created              : 2004.10.07
// Revised              : 2004.10.07
// Version              : 0.1
// Target MCU   : Atmel AVR series
// Editor Tabs  : 4
//
// This code is distributed under the GNU Public License
//              which can be found at http://www.gnu.org/licenses/gpl.txt
//
//*****************************************************************************

#include <avr/io.h>
#include <avr/interrupt.h>

#include "spi.h"
#include "spieeprom.h"

// functions
void spieepromInit(void)
{
        // although there is no code here
        // don't forget to initialize the SPI interface itself
//      sbi(DDRB, 0);
}

u08 spieepromReadByte(u32 memAddr)
{
        u08 data;
//      cbi(PORTB,0);
        // send command
        spiTransferByte(SPIEEPROM_CMD_READ);
        // send address
        spiTransferByte(memAddr>>8);
        spiTransferByte(memAddr&0x00FF);
        // read contents of memory address
        data = spiTransferByte(0xFF);
        // return data
        return data;
//      sbi(PORTB,0);
}

void spieepromWriteByte(u32 memAddr, u08 data)
{
        // wait for any previous write to complete
        while(spieepromReadStatus() & SPIEEPROM_STATUS_WIP);

//      cbi(PORTB,0);
        // send command
        spiTransferByte(SPIEEPROM_CMD_WRITE);
        // send address
        spiTransferByte(memAddr>>8);
        spiTransferByte(memAddr&0x00FF);
        // send data to be written
        spiTransferByte(data);
//      sbi(PORTB,0);
}

void spieepromWriteEnable(void)
{
//      cbi(PORTB,0);
        // send command
        spiTransferByte(SPIEEPROM_CMD_WREN);
//      sbi(PORTB,0);
}

void spieepromWriteDisable(void)
{
//      cbi(PORTB,0);
        // send command
        spiTransferByte(SPIEEPROM_CMD_WRDI);
//      sbi(PORTB,0);
}

u08 spieepromReadStatus(void)
{
        u08 status;
//      cbi(PORTB,0);
        // send command
        spiTransferByte(SPIEEPROM_CMD_RDSR);
        // get status register value
        status = spiTransferByte(0xFF);
//      sbi(PORTB,0);
        return status;
}