Colony

/**

 * Copyright (c) 2007 Colony Project

 * 

 * Permission is hereby granted, free of charge, to any person

 * obtaining a copy of this software and associated documentation

 * files (the "Software"), to deal in the Software without

 * restriction, including without limitation the rights to use,

 * copy, modify, merge, publish, distribute, sublicense, and/or sell

 * copies of the Software, and to permit persons to whom the

 * Software is furnished to do so, subject to the following

 * conditions:

 * 

 * The above copyright notice and this permission notice shall be

 * included in all copies or substantial portions of the Software.

 * 

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,

 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES

 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND

 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT

 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,

 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING

 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR

 * OTHER DEALINGS IN THE SOFTWARE.

 **/

/**

 * @file eeprom.c

 * @brief EEPROM Driver

 *

 * Implementation of functions for the EEPROM, including

 * retrieving the robot's id from EEPROM.

 *

 * @author Colony Project, CMU Robotics Club

 **/

#include <avr/io.h>

#include "eeprom.h"

int eeprom_put_byte(unsigned int uiAddress, unsigned char ucData) {

    /* Wait for completion of previous write */

    while(EECR & (1<<EEWE));

    /* Set up address and data registers */

    EEAR = uiAddress;

    EEDR = ucData;

    /* Write logical one to EEMWE */

    EECR |= (1<<EEMWE);

    /* Start eeprom write by setting EEWE */

    EECR |= (1<<EEWE);

    return 0;

}

int eeprom_get_byte(unsigned int uiAddress, unsigned char *byte) {

    /* Wait for completion of previous write */

    while(EECR & (1<<EEWE));

    /* Set up address register */

    EEAR = uiAddress;

    /* Start eeprom read by writing EERE */

    EECR |= (1<<EERE);

    /* get data from data register */

    *byte=EEDR;

    return 0;

}

unsigned char get_robotid(void) {

    unsigned char ret;

    eeprom_get_byte(EEPROM_ROBOT_ID_ADDR, &ret);

    return ret;

}