Remote Access Control

memory.h

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// This file has been prepared for Doxygen automatic documentation generation.
#ifndef MEMORY_H
#define MEMORY_H

#include "common.h"
#include "config.h"



/* --- EEPROM memory contents --- */

// Due to placement at absolute addresses, these variables
// are defined in the header file without external declaration.
// This means that every translation unit will have its own
// copy of the variable, but since they occupy the same place in
// memory, it doesn't give any extra memory usage.

__no_init SERIAL_NO_TYPE __eeprom serialNo @ SERIAL_NO_ADDRESS;
__no_init SEQ_COUNTER_TYPE __eeprom nextCounterValue @ SEQ_COUNTER_ADDRESS;

__no_init byte __eeprom secretKey[ KEY_SIZE ] @ SECRET_KEY_ADDRESS;
__no_init byte __eeprom sharedKey[ KEY_SIZE ] @ SHARED_KEY_ADDRESS;



/* --- SRAM memory contents --- */

extern byte cryptoBlock[ BLOCK_SIZE + 1 ]; // Leave room for one appended end byte when using this buffer to transmit MAC bytes.

struct MessagePayload
{
        byte preamble;
        SERIAL_NO_TYPE serialNo;
        SEQ_COUNTER_TYPE counterValue;
        COMMAND_CODE_TYPE commandCode;
};

union SharedBlock {
        struct MessagePayload messagePayload;
        byte cryptoBlock[ BLOCK_SIZE ];
};

extern union SharedBlock sharedBlock;



/* --- Associated functions --- */



void initializeMessage(void);
void createMessage( COMMAND_CODE_TYPE commandCode );
void startCounterUpdate();
void waitForCounterUpdate();



#endif