Remote Access Control

config.h

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



//#define RF_CARRIER 315 //!< Use 315.0 MHz RF carrier.
#define RF_CARRIER 433 
//#define RF_CARRIER 868 
//#define RF_CARRIER 915 



#define CPU_F 8000000

//#define DONT_ERASE_TRANSMITTERS

#define ASK 
//#define FSK 

#define INVERTED_MANCHESTER
//#define USE_UART

#define KEY_BITS 128 
//#define KEY_BITS 192 
//#define KEY_BITS 256 

#define SERIAL_NO_BYTES 4

#define COMMAND_CODE_BYTES 1

#define SEQ_COUNTER_BYTES 4

#define MAC_BYTES 4

#define MAX_TRANSMITTERS 5

#define WINDOW_SIZE 100

#define MAX_WATCHDOG_RESETS 3

// Long timeout delay = HI * 8.39 s + LO * 0.128 ms @ MHz

#define LONG_TIMEOUT_HI_VALUE 1
#define LONG_TIMEOUT_LO_VALUE 12578



#define LEARN_MODE_PCINT_VECT PCINT2_vect
#define LEARN_MODE_PCINT_ENABLE_BIT PCIE2
#define LEARN_MODE_PCINT_MASK_REG PCMSK2
#define LEARN_MODE_PCINT_MASK_BIT PCINT21
#define LEARN_MODE_INPUT_DDR DDRD
#define LEARN_MODE_INPUT_REG PIND
#define LEARN_MODE_INPUT_PULLUP_REG PORTD
#define LEARN_MODE_INPUT_BIT PD5
#define LEARN_MODE_OUTPUT_DDR DDRC
#define LEARN_MODE_OUTPUT_REG PORTC
#define LEARN_MODE_OUTPUT_BIT PC5
#define LEARN_MODE_OUTPUT_HIGH() LEARN_MODE_OUTPUT_REG |= (1<<LEARN_MODE_OUTPUT_BIT);
#define LEARN_MODE_OUTPUT_LOW() LEARN_MODE_OUTPUT_REG &= ~(1<<LEARN_MODE_OUTPUT_BIT);

#define POLY 0x8005 // CRC-16
//#define POLY 0x1021 // CRC-CCITT



/* --- Calculated parameters follow, do not change --- */

// Calc RF receiver configuration parameters.
// Consult receiver datasheet for LIM values.
#if RF_CARRIER == 315
  #define RX_XTAL_HZ 4906250
  #define RX_PRESCALE 10
  #define RX_LIM_MIN 20
  #define RX_LIM_MAX 32
#elif RF_CARRIER == 433
  #define RX_XTAL_HZ 6764380
  #define RX_PRESCALE 14
  #define RX_LIM_MIN 20
  #define RX_LIM_MAX 31
#elif RF_CARRIER == 868
  #define RX_XTAL_HZ 6776170
  #define RX_PRESCALE 14
  #define RX_LIM_MIN 20
  #define RX_LIM_MAX 31
#elif RF_CARRIER == 915
  #define RX_XTAL_HZ 7140630
  #define RX_PRESCALE 14
  #define RX_LIM_MIN 21
  #define RX_LIM_MAX 33
#else
  #error RF carrier must be 315, 433, 868 or 915!
#endif



#define BLOCK_SIZE 16
#define CMAC_SUBKEY_SIZE BLOCK_SIZE

// Calculate some info based on key bit count.
#if KEY_BITS == 128
  #define ROUNDS 10 
  #define KEY_SIZE 16 
  #define SCHEDULE_BLOCK_REPETITIONS 1 // Number of blocks/rounds in the schedule buffer.
  #define SCHEDULE_KEY_REPETITIONS 1 // Number of keys that fits in the schedule buffer.
  #define LAST_ROUND_CONSTANT 0x6C // Round constant taken from last encryption round.
#elif KEY_BITS == 192
  #define ROUNDS 12 
  #define KEY_SIZE 24 
  #define SCHEDULE_BLOCK_REPETITIONS 3 // Number of blocks/rounds in the schedule buffer.
  #define SCHEDULE_KEY_REPETITIONS 2 // Number of keys that fits in the schedule buffer.
  #define LAST_ROUND_CONSTANT 0x36 // Round constant taken from last encryption round.
#elif KEY_BITS == 256
  #define ROUNDS 14 
  #define KEY_SIZE 32 
  #define SCHEDULE_BLOCK_REPETITIONS 2 // Number of blocks/rounds in the schedule buffer.
  #define SCHEDULE_KEY_REPETITIONS 1 // Number of keys that fits in the schedule buffer.
  #define LAST_ROUND_CONSTANT 0x80 // Round constant taken from last encryption round.
#else
  #error Key must be 128, 192 or 256 bits!
#endif

#define SCHEDULE_BUFFER_SIZE (BLOCK_SIZE*SCHEDULE_BLOCK_REPETITIONS)

#define MESSAGE_SIZE_WO_MAC (SERIAL_NO_BYTES+COMMAND_CODE_BYTES+SERIAL_NO_BYTES)

// Check that message payload does not exceed AES block size.
#if MESSAGE_SIZE_WO_MAC > BLOCK_SIZE
  #error Message payload exceeds AES block size.
#endif

#define MESSAGE_SIZE_W_MAC (MESSAGE_SIZE_WO_MAC+MAC_BYTES)

// Prepare type and max value for serial number.
#if SERIAL_NO_BYTES == 1
  #define SERIAL_NO_TYPE uint8_t
  #define SERIAL_NO_MAX 0xff
#elif SERIAL_NO_BYTES == 2
  #define SERIAL_NO_TYPE uint16_t
  #define SERIAL_NO_MAX 0xffff
#elif SERIAL_NO_BYTES == 4
  #define SERIAL_NO_TYPE uint32_t
  #define SERIAL_NO_MAX 0xffffffff
#else
  #error Invalid serial number size, must be 1, 2 or 4 bytes.
#endif

// Prepare type and max value for command code.
#if COMMAND_CODE_BYTES == 1
  #define COMMAND_CODE_TYPE uint8_t
  #define COMMAND_CODE_MAX 0xff
#elif COMMAND_CODE_BYTES == 2
  #define COMMAND_CODE_TYPE uint16_t
  #define COMMAND_CODE_MAX 0xffff
#elif COMMAND_CODE_BYTES == 4
  #define COMMAND_CODE_TYPE uint32_t
  #define COMMAND_CODE_MAX 0xffffffff
#else
  #error Invalid command code size, must be 1, 2 or 4 bytes.
#endif

// Prepare type and max value for sequential counter.
#if SEQ_COUNTER_BYTES == 1
  #define SEQ_COUNTER_TYPE uint8_t
  #define SEQ_COUNTER_MAX 0xff
#elif SEQ_COUNTER_BYTES == 2
  #define SEQ_COUNTER_TYPE uint16_t
  #define SEQ_COUNTER_MAX 0xffff
#elif SEQ_COUNTER_BYTES == 4
  #define SEQ_COUNTER_TYPE uint32_t
  #define SEQ_COUNTER_MAX 0xffffffff
#else
  #error Invalid sequential counter size, must be 1, 2 or 4 bytes.
#endif



#endif