Giorgos Tsapparellas
LMiC adapted to work with SX1272MB2xAS LoRa shield.
Fork of
LMiC
by 
Timothy Mulrooney
Diff: lorabase.h
- Revision:
- 0:62d1edcc13d1
- Child:
- 1:d3b7bde3995c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/lorabase.h Thu Jan 22 12:50:49 2015 +0000
@@ -0,0 +1,372 @@
+/*******************************************************************************
+ * Copyright (c) 2014 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
+ *******************************************************************************/
+
+#ifndef _lorabase_h_
+#define _lorabase_h_
+
+// ================================================================================
+// BEG: Keep in sync with lorabase.hpp
+//
+
+enum _cr_t { CR_4_5=0, CR_4_6, CR_4_7, CR_4_8 };
+enum _sf_t { FSK=0, SF7, SF8, SF9, SF10, SF11, SF12, SFrfu };
+enum _bw_t { BW125=0, BW250, BW500, BWrfu };
+typedef u1_t cr_t;
+typedef u1_t sf_t;
+typedef u1_t bw_t;
+typedef u1_t dr_t;
+// Radio parameter set (encodes SF/BW/CR/IH/NOCRC)
+typedef u2_t rps_t;
+TYPEDEF_xref2rps_t;
+
+enum { ILLEGAL_RPS = 0xFF };
+enum { DR_PAGE_EU868 = 0x00 };
+enum { DR_PAGE_US915 = 0x10 };
+
+// Global maximum frame length
+enum { STD_PREAMBLE_LEN = 8 };
+enum { MAX_LEN_FRAME = 64 };
+enum { LEN_DEVNONCE = 2 };
+enum { LEN_ARTNONCE = 3 };
+enum { LEN_NETID = 3 };
+enum { DELAY_JACC1 = 5 }; // in secs
+enum { DELAY_DNW1 = 1 }; // in secs down window #1
+enum { DELAY_EXTDNW2 = 1 }; // in secs
+enum { DELAY_JACC2 = DELAY_JACC1+(int)DELAY_EXTDNW2 }; // in secs
+enum { DELAY_DNW2 = DELAY_DNW1 +(int)DELAY_EXTDNW2 }; // in secs down window #1
+enum { BCN_INTV_exp = 7 };
+enum { BCN_INTV_sec = 1<<BCN_INTV_exp };
+enum { BCN_INTV_ms = BCN_INTV_sec*1000L };
+enum { BCN_INTV_us = BCN_INTV_ms*1000L };
+enum { BCN_RESERVE_ms = 2120 }; // space reserved for beacon and NWK management
+enum { BCN_GUARD_ms = 3000 }; // end of beacon period to prevent interference with beacon
+enum { BCN_SLOT_SPAN_ms = 30 }; // 2^12 reception slots a this span
+enum { BCN_WINDOW_ms = BCN_INTV_ms-(int)BCN_GUARD_ms-(int)BCN_RESERVE_ms };
+enum { BCN_RESERVE_us = 2120000 };
+enum { BCN_GUARD_us = 3000000 };
+enum { BCN_SLOT_SPAN_us = 30000 };
+
+#if CFG_eu868 // ==============================================
+
+enum _dr_eu868_t { DR_SF12=0, DR_SF11, DR_SF10, DR_SF9, DR_SF8, DR_SF7, DR_SF7B, DR_FSK, DR_NONE };
+enum { DR_DFLTMIN = DR_SF7 };
+enum { DR_PAGE = DR_PAGE_EU868 };
+
+// Default frequency plan for EU 868MHz ISM band
+// Bands:
+// g1 : 1% 14dBm
+// g2 : 0.1% 14dBm
+// g3 : 10% 27dBm
+// freq band datarates
+enum { EU868_F1 = 868100000, // g1 SF7-12
+ EU868_F2 = 868300000, // g1 SF7-12 FSK SF7/250
+ EU868_F3 = 868500000, // g1 SF7-12
+ EU868_F4 = 868850000, // g2 SF7-12
+ EU868_F5 = 869050000, // g2 SF7-12
+ EU868_F6 = 869525000, // g3 SF7-12
+ EU868_J4 = 864100000, // g2 SF7-12 used during join
+ EU868_J5 = 864300000, // g2 SF7-12 ditto
+ EU868_J6 = 864500000, // g2 SF7-12 ditto
+};
+enum { EU868_FREQ_MIN = 863000000,
+ EU868_FREQ_MAX = 870000000 };
+
+enum { CHNL_PING = 5 };
+enum { FREQ_PING = EU868_F6 }; // default ping freq
+enum { DR_PING = SF9 }; // default ping DR
+enum { CHNL_DNW2 = 5 };
+enum { FREQ_DNW2 = EU868_F6 };
+enum { DR_DNW2 = DR_SF9 };
+enum { CHNL_BCN = 5 };
+enum { FREQ_BCN = EU868_F6 };
+enum { DR_BCN = DR_SF9 };
+enum { AIRTIME_BCN = 185344 }; // micros
+
+#elif CFG_us915 // =========================================
+
+enum _dr_us915_t { DR_SF10=0, DR_SF9, DR_SF8, DR_SF7, DR_SF8C, DR_NONE,
+ // Devices behind a router:
+ DR_SF12CR=8, DR_SF11CR, DR_SF10CR, DR_SF9CR, DR_SF8CR, DR_SF7CR };
+enum { DR_DFLTMIN = DR_SF8C };
+enum { DR_PAGE = DR_PAGE_US915 };
+
+// Default frequency plan for US 915MHz
+enum { US915_125kHz_UPFBASE = 902300000,
+ US915_125kHz_UPFSTEP = 200000,
+ US915_500kHz_UPFBASE = 903000000,
+ US915_500kHz_UPFSTEP = 1600000,
+ US915_500kHz_DNFBASE = 923300000,
+ US915_500kHz_DNFSTEP = 600000
+};
+enum { US915_FREQ_MIN = 902000000,
+ US915_FREQ_MAX = 928000000 };
+
+enum { CHNL_PING = 2 };
+enum { FREQ_PING = US915_500kHz_DNFBASE + CHNL_PING*US915_500kHz_DNFSTEP }; // default ping freq
+enum { DR_PING = DR_SF10CR }; // default ping DR
+enum { CHNL_DNW2 = 1 };
+enum { FREQ_DNW2 = US915_500kHz_DNFBASE + CHNL_DNW2*US915_500kHz_DNFSTEP };
+enum { DR_DNW2 = DR_SF10CR };
+enum { CHNL_BCN = 0 };
+enum { FREQ_BCN = US915_500kHz_DNFBASE + CHNL_BCN*US915_500kHz_DNFSTEP };
+enum { DR_BCN = DR_SF10CR };
+enum { AIRTIME_BCN = 82432 }; // micros
+
+#endif // ===================================================
+
+
+enum {
+ // Beacon frame format
+ OFF_BCN_RFU = 0,
+ OFF_BCN_NETID = 4,
+ OFF_BCN_CMAP = 7,
+ OFF_BCN_TIME = 9,
+ OFF_BCN_CRC1 = 13,
+ OFF_BCN_INFO = 15,
+ OFF_BCN_LAT = 16,
+ OFF_BCN_LON = 19,
+ OFF_BCN_CRC2 = 22,
+ LEN_BCN = 24
+};
+enum {
+ // Join Request frame format
+ OFF_JR_HDR = 0,
+ OFF_JR_ARTEUI = 1,
+ OFF_JR_DEVEUI = 9,
+ OFF_JR_DEVNONCE = 17,
+ OFF_JR_MIC = 19,
+ LEN_JR = 23
+};
+enum {
+ // Join Accept frame format
+ OFF_JA_HDR = 0,
+ OFF_JA_ARTNONCE = 1,
+ OFF_JA_NETID = 4,
+ OFF_JA_DEVADDR = 7,
+ OFF_JA_RFU = 11,
+ OFF_CFLIST = 14,
+ LEN_JA = 17,
+ LEN_JAEXT = 17+16
+};
+enum {
+ // Data frame format
+ OFF_DAT_HDR = 0,
+ OFF_DAT_ADDR = 1,
+ OFF_DAT_FCT = 5,
+ OFF_DAT_SEQNO = 6,
+ OFF_DAT_OPTS = 8,
+};
+enum { MAX_LEN_PAYLOAD = MAX_LEN_FRAME-(int)OFF_DAT_OPTS-4 };
+enum {
+ // Bitfields in frame format octet
+ HDR_FTYPE = 0xE0,
+ HDR_RFU = 0x1C,
+ HDR_MAJOR = 0x03
+};
+enum { HDR_FTYPE_DNFLAG = 0x20 }; // flags DN frame except for HDR_FTYPE_PROP
+enum {
+ // Values of frame type bit field
+ HDR_FTYPE_JREQ = 0x00,
+ HDR_FTYPE_JACC = 0x20,
+ HDR_FTYPE_DAUP = 0x40, // data (unconfirmed) up
+ HDR_FTYPE_DADN = 0x60, // data (unconfirmed) dn
+ HDR_FTYPE_DCUP = 0x80, // data confirmed up
+ HDR_FTYPE_DCDN = 0xA0, // data confirmed dn
+ HDR_FTYPE_REJOIN = 0xC0, // rejoin for roaming
+ HDR_FTYPE_PROP = 0xE0
+};
+enum {
+ HDR_MAJOR_V1 = 0x00,
+};
+enum {
+ // Bitfields in frame control octet
+ FCT_ADREN = 0x80,
+ FCT_ADRARQ = 0x40,
+ FCT_ACK = 0x20,
+ FCT_MORE = 0x10,
+ FCT_OPTLEN = 0x0F,
+};
+enum {
+ NWKID_MASK = (int)0xFE000000,
+ NWKID_BITS = 7
+};
+
+// MAC uplink commands downwlink too
+enum {
+ // Class A
+ MCMD_LCHK_REQ = 0x02, // - link check request : -
+ MCMD_LADR_ANS = 0x03, // - link ADR answer : u1:7-3:RFU, 3/2/1: pow/DR/Ch ACK
+ MCMD_DCAP_ANS = 0x04, // - duty cycle answer : -
+ MCMD_DN2P_ANS = 0x05, // - 2nd DN slot status : u1:7-2:RFU 1/0:datarate/channel ack
+ MCMD_DEVS_ANS = 0x06, // - device status ans : u1:battery 0,1-254,255=?, u1:7-6:RFU,5-0:margin(-32..31)
+ MCMD_SNCH_ANS = 0x07, // - set new channel : u1: 7-2=RFU, 1/0:DR/freq ACK
+ // Class B
+ MCMD_PING_IND = 0x10, // - pingability indic : u1: 7=RFU, 6-4:interval, 3-0:datarate
+ MCMD_PING_ANS = 0x11, // - ack ping freq : u1: 7-1:RFU, 0:freq ok
+ MCMD_BCNI_REQ = 0x12, // - next beacon start : -
+};
+
+// MAC downlink commands
+enum {
+ // Class A
+ MCMD_LCHK_ANS = 0x02, // link check answer : u1:margin 0-254,255=unknown margin / u1:gwcnt
+ MCMD_LADR_REQ = 0x03, // link ADR request : u1:DR/TXPow, u2:chmask, u1:chpage/repeat
+ MCMD_DCAP_REQ = 0x04, // duty cycle cap : u1:255 dead [7-4]:RFU, [3-0]:cap 2^-k
+ MCMD_DN2P_SET = 0x05, // 2nd DN window param: u1:7-4:RFU/3-0:datarate, u3:freq
+ MCMD_DEVS_REQ = 0x06, // device status req : -
+ MCMD_SNCH_REQ = 0x07, // set new channel : u1:chidx, u3:freq, u1:DRrange
+ // Class B
+ MCMD_PING_SET = 0x11, // set ping freq : u3: freq
+ MCMD_BCNI_ANS = 0x12, // next beacon start : u2: delay(10ms), u1:channel
+};
+
+enum {
+ MCMD_LADR_ANS_RFU = 0xF8, // RFU bits
+ MCMD_LADR_ANS_POWACK = 0x04, // 0=not supported power level
+ MCMD_LADR_ANS_DRACK = 0x02, // 0=unknown data rate
+ MCMD_LADR_ANS_CHACK = 0x01, // 0=unknown channel enabled
+};
+enum {
+ MCMD_DN2P_ANS_RFU = 0xFC, // RFU bits
+ MCMD_DN2P_ANS_DRACK = 0x02, // 0=unknown data rate
+ MCMD_DN2P_ANS_CHACK = 0x01, // 0=unknown channel enabled
+};
+enum {
+ MCMD_SNCH_ANS_RFU = 0xFC, // RFU bits
+ MCMD_SNCH_ANS_DRACK = 0x02, // 0=unknown data rate
+ MCMD_SNCH_ANS_FQACK = 0x01, // 0=rejected channel frequency
+};
+enum {
+ MCMD_PING_ANS_RFU = 0xFE,
+ MCMD_PING_ANS_FQACK = 0x01
+};
+
+enum {
+ MCMD_DEVS_EXT_POWER = 0x00, // external power supply
+ MCMD_DEVS_BATT_MIN = 0x01, // min battery value
+ MCMD_DEVS_BATT_MAX = 0xFE, // max battery value
+ MCMD_DEVS_BATT_NOINFO = 0xFF, // unknown battery level
+};
+
+// Bit fields byte#3 of MCMD_LADR_REQ payload
+enum {
+ MCMD_LADR_CHP_125ON = 0x60, // special channel page enable, bits applied to 64..71
+ MCMD_LADR_CHP_125OFF = 0x70, // ditto
+ MCMD_LADR_N3RFU_MASK = 0x80,
+ MCMD_LADR_CHPAGE_MASK = 0xF0,
+ MCMD_LADR_REPEAT_MASK = 0x0F,
+ MCMD_LADR_REPEAT_1 = 0x01,
+ MCMD_LADR_CHPAGE_1 = 0x10
+};
+// Bit fields byte#0 of MCMD_LADR_REQ payload
+enum {
+ MCMD_LADR_DR_MASK = 0xF0,
+ MCMD_LADR_POW_MASK = 0x0F,
+ MCMD_LADR_DR_SHIFT = 4,
+ MCMD_LADR_POW_SHIFT = 0,
+#if CFG_eu868
+ MCMD_LADR_SF12 = DR_SF12<<4,
+ MCMD_LADR_SF11 = DR_SF11<<4,
+ MCMD_LADR_SF10 = DR_SF10<<4,
+ MCMD_LADR_SF9 = DR_SF9 <<4,
+ MCMD_LADR_SF8 = DR_SF8 <<4,
+ MCMD_LADR_SF7 = DR_SF7 <<4,
+ MCMD_LADR_SF7B = DR_SF7B<<4,
+ MCMD_LADR_FSK = DR_FSK <<4,
+
+ MCMD_LADR_20dBm = 0,
+ MCMD_LADR_14dBm = 1,
+ MCMD_LADR_11dBm = 2,
+ MCMD_LADR_8dBm = 3,
+ MCMD_LADR_5dBm = 4,
+ MCMD_LADR_2dBm = 5,
+#elif CFG_us915
+ MCMD_LADR_SF10 = DR_SF10<<4,
+ MCMD_LADR_SF9 = DR_SF9 <<4,
+ MCMD_LADR_SF8 = DR_SF8 <<4,
+ MCMD_LADR_SF7 = DR_SF7 <<4,
+ MCMD_LADR_SF8C = DR_SF8C<<4,
+ MCMD_LADR_SF12CR = DR_SF12CR<<4,
+ MCMD_LADR_SF11CR = DR_SF11CR<<4,
+ MCMD_LADR_SF10CR = DR_SF10CR<<4,
+ MCMD_LADR_SF9CR = DR_SF9CR<<4,
+ MCMD_LADR_SF8CR = DR_SF8CR<<4,
+ MCMD_LADR_SF7CR = DR_SF7CR<<4,
+
+ MCMD_LADR_30dBm = 0,
+ MCMD_LADR_28dBm = 1,
+ MCMD_LADR_26dBm = 2,
+ MCMD_LADR_24dBm = 3,
+ MCMD_LADR_22dBm = 4,
+ MCMD_LADR_20dBm = 5,
+ MCMD_LADR_18dBm = 6,
+ MCMD_LADR_16dBm = 7,
+ MCMD_LADR_14dBm = 8,
+ MCMD_LADR_12dBm = 9,
+ MCMD_LADR_10dBm = 10
+#endif
+};
+
+// Device address
+typedef u4_t devaddr_t;
+
+
+// RX quality (device)
+enum { RSSI_OFF=64, SNR_SCALEUP=4 };
+struct rxqu_t {
+ s1_t rssi; // offset by RSSI_OFF, max physical RSSI range -198..+63
+ s1_t snr; // scaled by SNR_SCALEUP, max physical SNR range -32..+31.75
+};
+TYPEDEF_xref2rxqu_t;
+
+
+inline sf_t getSf (rps_t params) { return (sf_t)(params & 0x7); }
+inline rps_t setSf (rps_t params, sf_t sf) { return (rps_t)((params & ~0x7) | sf); }
+inline bw_t getBw (rps_t params) { return (bw_t)((params >> 3) & 0x3); }
+inline rps_t setBw (rps_t params, bw_t cr) { return (rps_t)((params & ~0x18) | (cr<<3)); }
+inline cr_t getCr (rps_t params) { return (cr_t)((params >> 5) & 0x3); }
+inline rps_t setCr (rps_t params, cr_t cr) { return (rps_t)((params & ~0x60) | (cr<<5)); }
+inline int getNocrc(rps_t params) { return ((params >> 7) & 0x1); }
+inline rps_t setNocrc(rps_t params, int nocrc) { return (rps_t)((params & ~0x80) | (nocrc<<7)); }
+inline int getIh (rps_t params) { return ((params >> 8) & 0xFF); }
+inline rps_t setIh (rps_t params, int ih) { return (rps_t)((params & ~0xFF00) | (ih<<8)); }
+inline rps_t makeRps (sf_t sf, bw_t bw, cr_t cr, int ih, int nocrc) {
+ return sf | (bw<<3) | (cr<<5) | (nocrc?(1<<7):0) | ((ih&0xFF)<<8);
+}
+#define MAKERPS(sf,bw,cr,ih,nocrc) ((rps_t)((sf) | ((bw)<<3) | ((cr)<<5) | ((nocrc)?(1<<7):0) | ((ih&0xFF)<<8)))
+// Two frames with params r1/r2 would interfere on air: same SFx + BWx
+inline int sameSfBw(rps_t r1, rps_t r2) { return ((r1^r2)&0x1F) == 0; }
+
+extern const u1_t _DR2RPS_CRC[];
+inline rps_t updr2rps (dr_t dr) { return (rps_t)_DR2RPS_CRC[dr+1]; }
+inline rps_t dndr2rps (dr_t dr) { return setNocrc(updr2rps(dr),1); }
+inline int isFasterDR (dr_t dr1, dr_t dr2) { return dr1 > dr2; }
+inline int isSlowerDR (dr_t dr1, dr_t dr2) { return dr1 < dr2; }
+inline dr_t incDR (dr_t dr) { return _DR2RPS_CRC[dr+2]==ILLEGAL_RPS ? dr : (dr_t)(dr+1); } // increase data rate
+inline dr_t decDR (dr_t dr) { return _DR2RPS_CRC[dr ]==ILLEGAL_RPS ? dr : (dr_t)(dr-1); } // decrease data rate
+inline dr_t assertDR (dr_t dr) { return _DR2RPS_CRC[dr+1]==ILLEGAL_RPS ? DR_DFLTMIN : dr; } // force into a valid DR
+inline bit_t validDR (dr_t dr) { return _DR2RPS_CRC[dr+1]!=ILLEGAL_RPS; } // in range
+inline dr_t lowerDR (dr_t dr, u1_t n) { while(n--){dr=decDR(dr);} return dr; } // decrease data rate by n steps
+
+//
+// BEG: Keep in sync with lorabase.hpp
+// ================================================================================
+
+
+// Convert between dBm values and power codes (MCMD_LADR_XdBm)
+s1_t pow2dBm (u1_t mcmd_ladr_p1);
+// Calculate airtime
+ostime_t calcAirTime (rps_t rps, u1_t plen);
+// Sensitivity at given SF/BW
+int getSensitivity (rps_t rps);
+
+
+#endif // _lorabase_h_