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/*******************************************************************************
 * Copyright (c) 2014-2015 IBM Corporation.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *    IBM Zurich Research Lab - initial API, implementation and documentation
 *******************************************************************************/

//! @file
//! @brief LMIC API

#ifndef _lmic_h_
#define _lmic_h_

// MBED compiler options
//#define CFG_eu868                                   1
#define CFG_us915                                   1
#define CHNL_HYBRID     0       /* US915: 0-7 to select block of 8 channels used */

#define USE_SMTC_RADIO_DRIVER                       1

//#define CFG_sx1272_radio                            0
#define CFG_sx1276_radio                            1
// End MBED compiler options

#include "oslmic.h"
#include "lorabase.h"

// LMIC version
#define LMIC_VERSION_MAJOR 1
#define LMIC_VERSION_MINOR 5
#define LMIC_VERSION_BUILD 1431528305

enum { MAX_FRAME_LEN      =  64 };   //!< Library cap on max frame length
enum { TXCONF_ATTEMPTS    =   8 };   //!< Transmit attempts for confirmed frames
enum { MAX_MISSED_BCNS    =  20 };   // threshold for triggering rejoin requests
enum { MAX_RXSYMS         = 100 };   // stop tracking beacon beyond this

enum { LINK_CHECK_CONT    =  12 ,    // continue with this after reported dead link
       LINK_CHECK_DEAD    =  24 ,    // after this UP frames and no response from NWK assume link is dead
       LINK_CHECK_INIT    = -12 ,    // UP frame count until we inc datarate
       LINK_CHECK_OFF     =-128 };   // link check disabled

enum { TIME_RESYNC        = 6*128 }; // secs
enum { TXRX_GUARD_ms      =  6000 };  // msecs - don't start TX-RX transaction before beacon
enum { JOIN_GUARD_ms      =  9000 };  // msecs - don't start Join Req/Acc transaction before beacon
enum { TXRX_BCNEXT_secs   =     2 };  // secs - earliest start after beacon time
enum { RETRY_PERIOD_secs  =     3 };  // secs - random period for retrying a confirmed send

#if defined(CFG_eu868) // EU868 spectrum ====================================================

enum { MAX_CHANNELS = 16 };      //!< Max supported channels
enum { MAX_BANDS    =  4 };

enum { LIMIT_CHANNELS = (1<<4) };   // EU868 will never have more channels
//! \internal
struct band_t {
    u2_t     txcap;     // duty cycle limitation: 1/txcap
    s1_t     txpow;     // maximum TX power
    u1_t     lastchnl;  // last used channel
    ostime_t avail;     // channel is blocked until this time
};
TYPEDEF_xref2band_t; //!< \internal

#elif defined(CFG_us915)  // US915 spectrum =================================================

enum { MAX_XCHANNELS = 2 };      // extra channels in RAM, channels 0-71 are immutable 
enum { MAX_TXPOW_125kHz = 30 };

#endif // ==========================================================================

// Keep in sync with evdefs.hpp::drChange
enum { DRCHG_SET, DRCHG_NOJACC, DRCHG_NOACK, DRCHG_NOADRACK, DRCHG_NWKCMD };
enum { KEEP_TXPOW = -128 };


//! \internal
struct rxsched_t {
    u1_t     dr;
    u1_t     intvExp;   // 0..7
    u1_t     slot;      // runs from 0 to 128
    u1_t     rxsyms;
    ostime_t rxbase;
    ostime_t rxtime;    // start of next spot
    u4_t     freq;
};
TYPEDEF_xref2rxsched_t;  //!< \internal


//! Parsing and tracking states of beacons.
enum { BCN_NONE    = 0x00,   //!< No beacon received
       BCN_PARTIAL = 0x01,   //!< Only first (common) part could be decoded (info,lat,lon invalid/previous)
       BCN_FULL    = 0x02,   //!< Full beacon decoded
       BCN_NODRIFT = 0x04,   //!< No drift value measured yet
       BCN_NODDIFF = 0x08 }; //!< No differential drift measured yet
//! Information about the last and previous beacons.
struct bcninfo_t {
    ostime_t txtime;  //!< Time when the beacon was sent
    s1_t     rssi;    //!< Adjusted RSSI value of last received beacon
    s1_t     snr;     //!< Scaled SNR value of last received beacon
    u1_t     flags;   //!< Last beacon reception and tracking states. See BCN_* values.
    u4_t     time;    //!< GPS time in seconds of last beacon (received or surrogate)
    //
    u1_t     info;    //!< Info field of last beacon (valid only if BCN_FULL set)
    s4_t     lat;     //!< Lat field of last beacon (valid only if BCN_FULL set)
    s4_t     lon;     //!< Lon field of last beacon (valid only if BCN_FULL set)
};

// purpose of receive window - lmic_t.rxState
enum { RADIO_RST=0, RADIO_TX=1, RADIO_RX=2, RADIO_RXON=3 };
// Netid values /  lmic_t.netid
enum { NETID_NONE=(int)~0U, NETID_MASK=(int)0xFFFFFF };
// MAC operation modes (lmic_t.opmode).
enum { OP_NONE     = 0x0000,
       OP_SCAN     = 0x0001, // radio scan to find a beacon
       OP_TRACK    = 0x0002, // track my networks beacon (netid)
       OP_JOINING  = 0x0004, // device joining in progress (blocks other activities)
       OP_TXDATA   = 0x0008, // TX user data (buffered in pendTxData)
       OP_POLL     = 0x0010, // send empty UP frame to ACK confirmed DN/fetch more DN data
       OP_REJOIN   = 0x0020, // occasionally send JOIN REQUEST
       OP_SHUTDOWN = 0x0040, // prevent MAC from doing anything
       OP_TXRXPEND = 0x0080, // TX/RX transaction pending
       OP_RNDTX    = 0x0100, // prevent TX lining up after a beacon
       OP_PINGINI  = 0x0200, // pingable is initialized and scheduling active
       OP_PINGABLE = 0x0400, // we're pingable
       OP_NEXTCHNL = 0x0800, // find a new channel
       OP_LINKDEAD = 0x1000, // link was reported as dead
       OP_TESTMODE = 0x2000, // developer test mode
};
// TX-RX transaction flags - report back to user
enum { TXRX_ACK    = 0x80,   // confirmed UP frame was acked
       TXRX_NACK   = 0x40,   // confirmed UP frame was not acked
       TXRX_NOPORT = 0x20,   // set if a frame with a port was RXed, clr if no frame/no port
       TXRX_PORT   = 0x10,   // set if a frame with a port was RXed, LMIC.frame[LMIC.dataBeg-1] => port
       TXRX_DNW1   = 0x01,   // received in 1st DN slot
       TXRX_DNW2   = 0x02,   // received in 2dn DN slot
       TXRX_PING   = 0x04 }; // received in a scheduled RX slot
// Event types for event callback
enum _ev_t { EV_SCAN_TIMEOUT=1, EV_BEACON_FOUND,
             EV_BEACON_MISSED, EV_BEACON_TRACKED, EV_JOINING,
             EV_JOINED, EV_RFU1, EV_JOIN_FAILED, EV_REJOIN_FAILED,
             EV_TXCOMPLETE, EV_LOST_TSYNC, EV_RESET,
             EV_RXCOMPLETE, EV_LINK_DEAD, EV_LINK_ALIVE };
typedef enum _ev_t ev_t;


struct lmic_t {
    // Radio settings TX/RX (also accessed by HAL)
    ostime_t    txend;
    ostime_t    rxtime;
    u4_t        freq;
    s1_t        rssi;
    s1_t        snr;
    rps_t       rps;
    u1_t        rxsyms;
    u1_t        dndr;
    s1_t        txpow;     // dBm
    s1_t        txpow_limit;    // dBm maximum permitted

    osjob_t     osjob;

    // Channel scheduling
#if defined(CFG_eu868)
    band_t      bands[MAX_BANDS];
    u4_t        channelFreq[MAX_CHANNELS];
    u2_t        channelDrMap[MAX_CHANNELS];
    u2_t        channelMap;
#elif defined(CFG_us915)
    u4_t        xchFreq[MAX_XCHANNELS];    // extra channel frequencies (if device is behind a repeater)
    u2_t        xchDrMap[MAX_XCHANNELS];   // extra channel datarate ranges  ---XXX: ditto
    u2_t        channelMap[(72+MAX_XCHANNELS+15)/16];  // enabled bits
    u2_t        chRnd;        // channel randomizer
#endif
    u1_t        txChnl;          // channel for next TX
    u1_t        globalDutyRate;  // max rate: 1/2^k
    ostime_t    globalDutyAvail; // time device can send again
    
    u4_t        netid;        // current network id (~0 - none)
    u2_t        opmode;
    u1_t        upRepeat;     // configured up repeat
    s1_t        adrTxPow;     // ADR adjusted TX power
    u1_t        datarate;     // current data rate
    u1_t        errcr;        // error coding rate (used for TX only)
    u1_t        rejoinCnt;    // adjustment for rejoin datarate
    u1_t        joinBlock;    // during join attempt: current channel block
    u1_t        joinBlockChnl;    // during join attempt: current 125KHz channel    
    s2_t        drift;        // last measured drift
    s2_t        lastDriftDiff;
    s2_t        maxDriftDiff;

    u1_t        pendTxPort;
    u1_t        pendTxConf;   // confirmed data
    u1_t        pendTxLen;    // +0x80 = confirmed
    u1_t        pendTxData[MAX_LEN_PAYLOAD];

    u2_t        devNonce;     // last generated nonce
    u1_t        nwkKey[16];   // network session key
    u1_t        artKey[16];   // application router session key
    devaddr_t   devaddr;
    u4_t        seqnoDn;      // device level down stream seqno
    u4_t        seqnoUp;

    u1_t        dnConf;       // dn frame confirm pending: LORA::FCT_ACK or 0
    s1_t        adrAckReq;    // counter until we reset data rate (0=off)
    u1_t        adrChanged;

    u1_t        margin;
    bit_t       ladrAns;      // link adr adapt answer pending
    bit_t       devsAns;      // device status answer pending
    u1_t        adrEnabled;
    u1_t        moreData;     // NWK has more data pending
    bit_t       dutyCapAns;   // have to ACK duty cycle settings
    u1_t        snchAns;      // answer set new channel
    // 2nd RX window (after up stream)
    u1_t        dn2Dr;
    u4_t        dn2Freq;
    u1_t        dn2Ans;       // 0=no answer pend, 0x80+ACKs

    // Class B state
    u1_t        missedBcns;   // unable to track last N beacons
    u1_t        bcninfoTries; // how often to try (scan mode only)
    u1_t        pingSetAns;   // answer set cmd and ACK bits
    rxsched_t   ping;         // pingable setup

    // Public part of MAC state
    u1_t        txCnt;
    u1_t        txrxFlags;  // transaction flags (TX-RX combo)
    u1_t        dataBeg;    // 0 or start of data (dataBeg-1 is port)
    u1_t        dataLen;    // 0 no data or zero length data, >0 byte count of data
    u1_t        frame[MAX_LEN_FRAME];

    u1_t        bcnChnl;
    u1_t        bcnRxsyms;    // 
    ostime_t    bcnRxtime;
    bcninfo_t   bcninfo;      // Last received beacon info
};
//! \var struct lmic_t LMIC
//! The state of LMIC MAC layer is encapsulated in this variable.
DECLARE_LMIC; //!< \internal

//! Construct a bit map of allowed datarates from drlo to drhi (both included). 
#define DR_RANGE_MAP(drlo,drhi) (((u2_t)0xFFFF<<(drlo)) & ((u2_t)0xFFFF>>(15-(drhi))))
#if defined(CFG_eu868)
enum { BAND_MILLI=0, BAND_CENTI=1, BAND_DECI=2, BAND_AUX=3 };
bit_t LMIC_setupBand (u1_t bandidx, s1_t txpow, u2_t txcap);
#endif
bit_t LMIC_setupChannel (u1_t channel, u4_t freq, u2_t drmap, s1_t band);
void  LMIC_disableChannel (u1_t channel);

void  LMIC_setDrTxpow   (dr_t dr, s1_t txpow);  // set default/start DR/txpow
void  LMIC_setAdrMode   (bit_t enabled);        // set ADR mode (if mobile turn off)
bit_t LMIC_startJoining (void);

void  LMIC_shutdown     (void);
void  LMIC_init         (void);
void  LMIC_reset        (void);
void  LMIC_clrTxData    (void);
void  LMIC_setTxData    (void);
int   LMIC_setTxData2   (u1_t port, xref2u1_t data, u1_t dlen, u1_t confirmed);
void  LMIC_sendAlive    (void);

bit_t LMIC_enableTracking  (u1_t tryBcnInfo);
void  LMIC_disableTracking (void);

void  LMIC_stopPingable  (void);
void  LMIC_setPingable   (u1_t intvExp);
void  LMIC_tryRejoin     (void);

void LMIC_setSession (u4_t netid, devaddr_t devaddr, xref2u1_t nwkKey, xref2u1_t artKey);
void LMIC_setLinkCheckMode (bit_t enabled);

void LMIC_reverse_memcpy(u1_t *dst, const u1_t *src, size_t len);
// Special APIs - for development or testing
// !!!See implementation for caveats!!!

#endif // _lmic_h_