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root / demos / hunter_prey / lib / src / libdragonfly / eeprom.c @ 1828

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#include <avr/io.h>
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#include "eeprom.h"
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int eeprom_put_byte(unsigned int uiAddress, unsigned char ucData) {
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    /* Wait for completion of previous write */
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    while(EECR & (1<<EEWE));
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    /* Set up address and data registers */
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    EEAR = uiAddress;
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    EEDR = ucData;
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    /* Write logical one to EEMWE */
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    EECR |= (1<<EEMWE);
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    /* Start eeprom write by setting EEWE */
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    EECR |= (1<<EEWE);
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    return 0;
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}
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int eeprom_get_byte(unsigned int uiAddress, unsigned char *byte) {
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    /* Wait for completion of previous write */
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    while(EECR & (1<<EEWE));
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    /* Set up address register */
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    EEAR = uiAddress;
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    /* Start eeprom read by writing EERE */
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    EECR |= (1<<EERE);
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    /* get data from data register */
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    *byte=EEDR;
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    return 0;
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}
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unsigned char get_robotid(void) {
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    unsigned char c0, c1, c2;
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    eeprom_get_byte(EEPROM_ROBOT_ID_ADDR, &c0);
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    eeprom_get_byte(EEPROM_ROBOT_ID_ADDR+1, &c1);
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    eeprom_get_byte(EEPROM_ROBOT_ID_ADDR+2, &c2);
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    if(c0 == 'I' && c1 == 'D')
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        return c2;
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    else
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        return 0xFF;
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}
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unsigned char get_bom_type(void) {
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    unsigned char c0, c1, c2, c3;
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    eeprom_get_byte(EEPROM_BOM_TYPE_ADDR, &c0);
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    eeprom_get_byte(EEPROM_BOM_TYPE_ADDR+1, &c1);
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    eeprom_get_byte(EEPROM_BOM_TYPE_ADDR+2, &c2);
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    eeprom_get_byte(EEPROM_BOM_TYPE_ADDR+3, &c3);
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    if(c0 == 'B' && c1 == 'O' && c2 == 'M')
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        return c3;
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    else
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        return 0xFF;
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}