/*****************************************************************************/
/**
 * Description: A simplified version of timesync for datalink 814 (Dijian)
 * 
 * Date: 2021-12-04 16:32
 * LastEditors: Fan Hao
 * LastEditTime: 2022-07-06 16:32
 * Revisions: Rev 0.0
 * History: 
 * [2022-07-06]: Initial version.
 * [2021-12-04]: Initial version.
 * 
 * Copyright(c) 2021 Beijing Institute of Technology.
 * Lab of Communication and Networking
 * 
 ******************************************************************************/

#ifndef RTT_H_
#define RTT_H_

/***************************** Include Files *********************************/
#include <stdint.h>
#include "linklayer814.h"
#include "linklayer814_types.h"

/************************** Constant Definitions *****************************/
#define MAX_FREQ_EST_NUM 128 // 32bit word
#define SVC_FREQ_EST_NUM 512 // byte
#define MGMT_FREQ_EST_NUM 512 // byte
#define BISAR_FREQ_EST_NUM 480 // byte

#define CXR_FREQ 3800000000.0       // Hz

#define LIGHT_SPPED_AIR 299702547.0 // m/s
#define LIGHT_SPPED_VAC 299792458.0 // m/s

#define RCV2FSYNC_CLOCKS 0 // clocks from frame sync time to receive time
#define PHYRSP_DELAY_CLOCKS 0// clocks from frame sync time to receive time
//#define PHY_SYNCT2FEND_200K 904052L
//#define PHY_SYNCT2FEND_200K 924232L
#define PHY_SYNCT2FEND_200K 905052L

#define RTT_TIME_NONE	UINT32_MAX
#define RTT_DOPPLER_NONE	UINT32_MAX


/***************** Macros (Inline Functions) Definitions *********************/

/**************************** Type Definitions *******************************/

// TODO: Multi-node RTT
typedef struct {
	L2_TIME_WORD Tt1;
	L2_TIME_WORD Tr1;
	L2_TIME_WORD Tt2;
	L2_TIME_WORD Tr2;
	L2_TIME_WORD Tt3;
	L2_TIME_WORD Tr3;
	L2_TIME_WORD Tt4;
	L2_TIME_WORD Tr4;
	int32_t dopplerR1;
	int32_t dopplerR2;
	int32_t dopplerR3;
	int32_t dopplerR4;
	L2_TIME_WORD TroundA;
	L2_TIME_WORD TreplyA;
	L2_TIME_WORD TroundB;
	L2_TIME_WORD TreplyB;
	int32_t rttAdj;
} RTT_RECORD;

typedef enum {
	RTT_NONE_STAGE = 0,
	RTT_REQ1 = 1,
	RTT_RSP1 = 2,
	RTT_REQ2 = 3,
	RTT_RSP2 = 4, // Rtt Stages
} L2_RTT_SATGE;

typedef struct {
	L2_RCD rttStatge;
	bool isR1Valid;
	bool isR2Valid;
	bool isR3Valid;
	bool isR4Valid;
	RTT_RECORD rttRecord;
} L2_RTT_FSM;

typedef enum {
	RTT_NONE = 0,
	RTT_SEND = 1,
	RTT_RCV = 2,
} L2_RTT_TOR;

/************************** Function Prototypes ******************************/

// RTT
L2_RTT_SATGE RTT_GetLastStage(L2_RTT_FSM* rttFsmPtr);
L2_RTT_SATGE RTT_GetCurrentStage(L2_RTT_FSM* rttFsmPtr);
L2_RTT_SATGE RTT_GetNextStage(L2_RTT_FSM* rttFsmPtr);

#endif /* RTT_H_ */