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ttn-esp32/src/lmic/lmic_us915.c

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/*
* Copyright (c) 2014-2016 IBM Corporation.
* Copyright (c) 2017, 2019 MCCI Corporation.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of the <organization> nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#define LMIC_DR_LEGACY 0
#include "lmic_bandplan.h"
#if defined(CFG_us915)
// ================================================================================
//
// BEG: US915 related stuff
//
CONST_TABLE(u1_t, _DR2RPS_CRC)[] = {
ILLEGAL_RPS, // [-1]
MAKERPS(SF10, BW125, CR_4_5, 0, 0), // [0]
MAKERPS(SF9 , BW125, CR_4_5, 0, 0), // [1]
MAKERPS(SF8 , BW125, CR_4_5, 0, 0), // [2]
MAKERPS(SF7 , BW125, CR_4_5, 0, 0), // [3]
MAKERPS(SF8 , BW500, CR_4_5, 0, 0), // [4]
ILLEGAL_RPS , // [5]
ILLEGAL_RPS , // [6]
ILLEGAL_RPS , // [7]
MAKERPS(SF12, BW500, CR_4_5, 0, 0), // [8]
MAKERPS(SF11, BW500, CR_4_5, 0, 0), // [9]
MAKERPS(SF10, BW500, CR_4_5, 0, 0), // [10]
MAKERPS(SF9 , BW500, CR_4_5, 0, 0), // [11]
MAKERPS(SF8 , BW500, CR_4_5, 0, 0), // [12]
MAKERPS(SF7 , BW500, CR_4_5, 0, 0), // [13]
ILLEGAL_RPS // [14]
};
static CONST_TABLE(u1_t, maxFrameLens)[] = {
19+5, 61+5, 133+5, 250+5, 250+5, 0, 0,0,
61+5, 133+5, 250+5, 250+5, 250+5, 250+5
};
uint8_t LMICus915_maxFrameLen(uint8_t dr) {
if (dr < LENOF_TABLE(maxFrameLens))
return TABLE_GET_U1(maxFrameLens, dr);
else
return 0;
}
int8_t LMICus915_pow2dbm(uint8_t mcmd_ladr_p1) {
if ((mcmd_ladr_p1 & MCMD_LinkADRReq_POW_MASK) >
((LMIC_LORAWAN_SPEC_VERSION < LMIC_LORAWAN_SPEC_VERSION_1_0_3)
? US915_LinkAdrReq_POW_MAX_1_0_2
: US915_LinkAdrReq_POW_MAX_1_0_3))
return -128;
else
return ((s1_t)(US915_TX_MAX_DBM - (((mcmd_ladr_p1)&MCMD_LinkADRReq_POW_MASK)<<1)));
}
static CONST_TABLE(ostime_t, DR2HSYM_osticks)[] = {
us2osticksRound(128 << 5), // DR_SF10 DR_SF12CR
us2osticksRound(128 << 4), // DR_SF9 DR_SF11CR
us2osticksRound(128 << 3), // DR_SF8 DR_SF10CR
us2osticksRound(128 << 2), // DR_SF7 DR_SF9CR
us2osticksRound(128 << 1), // DR_SF8C DR_SF8CR
us2osticksRound(128 << 0) // ------ DR_SF7CR
};
ostime_t LMICus915_dr2hsym(uint8_t dr) {
return TABLE_GET_OSTIME(DR2HSYM_osticks, (dr) & 7); // map DR_SFnCR -> 0-6
}
u4_t LMICus915_convFreq(xref2cu1_t ptr) {
u4_t freq = (os_rlsbf4(ptr - 1) >> 8) * 100;
if (freq < US915_FREQ_MIN || freq > US915_FREQ_MAX)
freq = 0;
return freq;
}
bit_t LMIC_setupChannel(u1_t chidx, u4_t freq, u2_t drmap, s1_t band) {
LMIC_API_PARAMETER(band);
if (chidx < 72 || chidx >= 72 + MAX_XCHANNELS)
return 0; // channels 0..71 are hardwired
LMIC.xchFreq[chidx - 72] = freq;
// TODO(tmm@mcci.com): don't use US SF directly, use something from the LMIC context or a static const
LMIC.xchDrMap[chidx - 72] = drmap == 0 ? DR_RANGE_MAP(US915_DR_SF10, US915_DR_SF8C) : drmap;
LMIC.channelMap[chidx >> 4] |= (1 << (chidx & 0xF));
return 1;
}
bit_t LMIC_disableChannel(u1_t channel) {
bit_t result = 0;
if (channel < 72 + MAX_XCHANNELS) {
if (ENABLED_CHANNEL(channel)) {
result = 1;
if (IS_CHANNEL_125khz(channel))
LMIC.activeChannels125khz--;
else if (IS_CHANNEL_500khz(channel))
LMIC.activeChannels500khz--;
}
LMIC.channelMap[channel >> 4] &= ~(1 << (channel & 0xF));
}
return result;
}
bit_t LMIC_enableChannel(u1_t channel) {
bit_t result = 0;
if (channel < 72 + MAX_XCHANNELS) {
if (!ENABLED_CHANNEL(channel)) {
result = 1;
if (IS_CHANNEL_125khz(channel))
LMIC.activeChannels125khz++;
else if (IS_CHANNEL_500khz(channel))
LMIC.activeChannels500khz++;
}
LMIC.channelMap[channel >> 4] |= (1 << (channel & 0xF));
}
return result;
}
bit_t LMIC_enableSubBand(u1_t band) {
ASSERT(band < 8);
u1_t start = band * 8;
u1_t end = start + 8;
bit_t result = 0;
// enable all eight 125 kHz channels in this subband
for (int channel = start; channel < end; ++channel)
result |= LMIC_enableChannel(channel);
// there's a single 500 kHz channel associated with
// each group of 8 125 kHz channels. Enable it, too.
result |= LMIC_enableChannel(64 + band);
return result;
}
bit_t LMIC_disableSubBand(u1_t band) {
ASSERT(band < 8);
u1_t start = band * 8;
u1_t end = start + 8;
bit_t result = 0;
// disable all eight 125 kHz channels in this subband
for (int channel = start; channel < end; ++channel)
result |= LMIC_disableChannel(channel);
// there's a single 500 kHz channel associated with
// each group of 8 125 kHz channels. Disable it, too.
result |= LMIC_disableChannel(64 + band);
return result;
}
bit_t LMIC_selectSubBand(u1_t band) {
bit_t result = 0;
ASSERT(band < 8);
for (int b = 0; b<8; ++b) {
if (band == b)
result |= LMIC_enableSubBand(b);
else
result |= LMIC_disableSubBand(b);
}
return result;
}
void LMICus915_updateTx(ostime_t txbeg) {
u1_t chnl = LMIC.txChnl;
if (chnl < 64) {
LMIC.freq = US915_125kHz_UPFBASE + chnl*US915_125kHz_UPFSTEP;
if (LMIC.activeChannels125khz >= 50)
LMIC.txpow = 30;
else
LMIC.txpow = 21;
} else {
// at 500kHz bandwidth, we're allowed more power.
LMIC.txpow = 26;
if (chnl < 64 + 8) {
LMIC.freq = US915_500kHz_UPFBASE + (chnl - 64)*US915_500kHz_UPFSTEP;
}
else {
ASSERT(chnl < 64 + 8 + MAX_XCHANNELS);
LMIC.freq = LMIC.xchFreq[chnl - 72];
}
}
// Update global duty cycle stats
if (LMIC.globalDutyRate != 0) {
ostime_t airtime = calcAirTime(LMIC.rps, LMIC.dataLen);
LMIC.globalDutyAvail = txbeg + (airtime << LMIC.globalDutyRate);
}
}
#if !defined(DISABLE_BEACONS)
void LMICus915_setBcnRxParams(void) {
LMIC.dataLen = 0;
LMIC.freq = US915_500kHz_DNFBASE + LMIC.bcnChnl * US915_500kHz_DNFSTEP;
LMIC.rps = setIh(setNocrc(dndr2rps((dr_t)DR_BCN), 1), LEN_BCN);
}
#endif // !DISABLE_BEACONS
// set the Rx1 dndr, rps.
void LMICus915_setRx1Params(void) {
u1_t const txdr = LMIC.dndr;
u1_t candidateDr;
LMIC.freq = US915_500kHz_DNFBASE + (LMIC.txChnl & 0x7) * US915_500kHz_DNFSTEP;
if ( /* TX datarate */txdr < LORAWAN_DR4)
candidateDr = txdr + 10 - LMIC.rx1DrOffset;
else
candidateDr = LORAWAN_DR13 - LMIC.rx1DrOffset;
if (candidateDr < LORAWAN_DR8)
candidateDr = LORAWAN_DR8;
else if (candidateDr > LORAWAN_DR13)
candidateDr = LORAWAN_DR13;
LMIC.dndr = candidateDr;
LMIC.rps = dndr2rps(LMIC.dndr);
}
void LMICus915_initJoinLoop(void) {
LMICuslike_initJoinLoop();
// initialize the adrTxPower.
LMIC.adrTxPow = 20; // dBm
}
//
// END: US915 related stuff
//
// ================================================================================
#endif
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