Diff: lmic.h

Revision:

0:f2716e543d97

Child:

5:e4ba433f0ac1

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lmic.h	Tue Jun 02 19:04:29 2015 +0000
@@ -0,0 +1,264 @@
+/*******************************************************************************
+ * 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_
+
+#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
+
+    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
+    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);
+
+// Special APIs - for development or testing
+// !!!See implementation for caveats!!!
+
+#endif // _lmic_h_