#ifndef RADIO_DEF_H
#define RADIO_DEF_H

//Buffer Sizes
#define TX_NUM_MESSAGES   4
#define RX_NUM_MESSAGES   4
#define RADIO_INC_TX(x) if(++x>=TX_NUM_MESSAGES)x=0
#define RADIO_INC_RX(x) if(++x>=RX_NUM_MESSAGES)x=0

//Message Overhead
#define RADIO_LEN_START_SEQ 4
#define RADIO_LEN_ADDR      2
#define RADIO_LEN_TYPE      1
#define RADIO_LEN_LEN       1
#define RADIO_LEN_CRC       2
#define RADIO_LEN_HEADER (RADIO_LEN_START_SEQ+RADIO_LEN_ADDR+RADIO_LEN_TYPE+RADIO_LEN_LEN)
#define RADIO_OVERHEAD (RADIO_LEN_HEADER+RADIO_LEN_CRC)

//Message Parameter Positions
#define RADIO_POS_SEQ0 0
#define RADIO_POS_SEQ1 1
#define RADIO_POS_SEQ2 2
#define RADIO_POS_SEQ3 3
#define RADIO_POS_DEST 4
#define RADIO_POS_SRC  5
#define RADIO_POS_TYPE 6
#define RADIO_POS_LEN  7
#define RADIO_POS_DATA (RADIO_POS_LEN+1)

//Message Constants
#define RADIO_START_BYTE0 0xFF
#define RADIO_START_BYTE1 0x00
#define RADIO_START_BYTE2 0xBE
#define RADIO_START_BYTE3 0xEF
#define RADIO_HS_NONE 0
#define RADIO_HS_ACK  1
#define RADIO_HS_NACK 2

//Message Types
#define RADIO_MSG_TYPE_DATA 0x00
#define RADIO_MSG_TYPE_ACK  0x01
#define RADIO_MSG_TYPE_NACK 0x02

//I/O Location
#define RADIO_DDR   DDRD
#define RADIO_PORT  PORTD
#define RADIO_PIN   PIND
#define RADIO_RX_EN 3
#define RADIO_TX_EN 2

//TX States
#define RADIO_TX_STATE_SEND 0
#define RADIO_TX_STATE_HS   1
#define RADIO_TX_STATE_COMP 2
#define RADIO_TX_STATE_FAIL 3
#define RADIO_TX_STATE_RETX 4
#define RADIO_TX_STATE_IDLE 5

//RX States
#define RADIO_RX_CHAR_STATE_0  0
#define RADIO_RX_CHAR_STATE_1  1
#define RADIO_RX_CHAR_STATE_2  2
#define RADIO_RX_CHAR_STATE_3  3
#define RADIO_RX_CHAR_STATE_OK 4

//Modes
#define RADIO_MODE_TX 0
#define RADIO_MODE_RX 1

//Timeouts
#define RADIO_TX_TIMEOUT 5 //TX state machine timeout (ms).
#define RADIO_CHAR_TIMEOUT 5 //RX character timeout (ms).
#define RADIO_HS_TIMEOUT 500 //Handshake timeout (ms).
#define RADIO_RETX_TIMEOUT 100 //Retransmit timeout (ms).//FIXME Replace this with LFSR.

void radio_switch_mode(unsigned char mode,unsigned char pri);
unsigned int crc16(unsigned char len, unsigned char *payload);
//unsigned char next_retx_timeout(void);
signed char radio_send_msg(unsigned char dest, unsigned char retransmit, unsigned char type, unsigned char len, unsigned char *payload);
signed char radio_send_pri(unsigned char dest, unsigned char type, unsigned char len, unsigned char *payload);
void radio_send_hs(unsigned char src,unsigned char type);
//void radio_send_hs_debug(unsigned char src,unsigned char type,unsigned char len,unsigned char *payload);

#endif