/*
* Copyright (c) 2014-2016 IBM Corporation.
* Copyright (c) 2017 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_au921)
// ================================================================================
//
// BEG: AU921 related stuff
//

CONST_TABLE(u1_t, _DR2RPS_CRC)[] = {
        ILLEGAL_RPS,                            // [-1]
        MAKERPS(SF12, BW125, CR_4_5, 0, 0),     // [0]
        MAKERPS(SF11, BW125, CR_4_5, 0, 0),     // [1]
        MAKERPS(SF10, BW125, CR_4_5, 0, 0),     // [2]
        MAKERPS(SF9 , BW125, CR_4_5, 0, 0),     // [3]
        MAKERPS(SF8 , BW125, CR_4_5, 0, 0),     // [4]
        MAKERPS(SF7 , BW125, CR_4_5, 0, 0),     // [5]
        MAKERPS(SF8 , BW500, CR_4_5, 0, 0),     // [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                             
};

static CONST_TABLE(u1_t, maxFrameLens)[] = { 
        59+5,  59+5,  59+5, 123+5, 230+5, 230+5, 230+5, 255, 
        41+5, 117+5, 230+5, 230+5, 230+5, 230+5 };

uint8_t LMICau921_maxFrameLen(uint8_t dr) {
        if (dr < LENOF_TABLE(maxFrameLens))
                return TABLE_GET_U1(maxFrameLens, dr);
        else
                return 0xFF;
}

static CONST_TABLE(ostime_t, DR2HSYM_osticks)[] = {
        us2osticksRound(128 << 7),  // DR_SF12  
        us2osticksRound(128 << 6),  // DR_SF11
        us2osticksRound(128 << 5),  // DR_SF10
        us2osticksRound(128 << 4),  // DR_SF9 
        us2osticksRound(128 << 3),  // DR_SF8 
        us2osticksRound(128 << 2),  // DR_SF7 
        us2osticksRound(128 << 1),  // DR_SF8C
        us2osticksRound(128 << 0),  // ------ 
        us2osticksRound(128 << 5),  // DR_SF12CR
        us2osticksRound(128 << 4),  // DR_SF11CR 
        us2osticksRound(128 << 3),  // DR_SF10CR 
        us2osticksRound(128 << 2),  // DR_SF9CR
        us2osticksRound(128 << 1),  // DR_SF8CR
        us2osticksRound(128 << 0),  // DR_SF7CR
};

// get ostime for symbols based on datarate. This is not like us915, 
// becuase the times don't match between the upper half and lower half
// of the table.
ostime_t LMICau921_dr2hsym(uint8_t dr) {
        return TABLE_GET_OSTIME(DR2HSYM_osticks, dr);
}



u4_t LMICau921_convFreq(xref2cu1_t ptr) {
        u4_t freq = (os_rlsbf4(ptr - 1) >> 8) * 100;
        if (freq < AU921_FREQ_MIN || freq > AU921_FREQ_MAX)
                freq = 0;
        return freq;
}

// au921: no support for xchannels.
bit_t LMIC_setupChannel(u1_t chidx, u4_t freq, u2_t drmap, s1_t band) {
        return 0; // all channels are hardwired.
}

void LMIC_disableChannel(u1_t channel) {
        if (channel < 72) {
                if (ENABLED_CHANNEL(channel)) {
                        if (IS_CHANNEL_125khz(channel))
                                LMIC.activeChannels125khz--;
                        else if (IS_CHANNEL_500khz(channel))
                                LMIC.activeChannels500khz--;
                }
                LMIC.channelMap[channel >> 4] &= ~(1 << (channel & 0xF));
        }
}

void LMIC_enableChannel(u1_t channel) {
        if (channel < 72) {
                if (!ENABLED_CHANNEL(channel)) {
                        if (IS_CHANNEL_125khz(channel))
                                LMIC.activeChannels125khz++;
                        else if (IS_CHANNEL_500khz(channel))
                                LMIC.activeChannels500khz++;
                }
                LMIC.channelMap[channel >> 4] |= (1 << (channel & 0xF));
        }
}

void  LMIC_enableSubBand(u1_t band) {
        ASSERT(band < 8);
        u1_t start = band * 8;
        u1_t end = start + 8;

        // enable all eight 125 kHz channels in this subband
        for (int channel = start; channel < end; ++channel)
                LMIC_enableChannel(channel);

        // there's a single 500 kHz channel associated with
        // each group of 8 125 kHz channels. Enable it, too.
        LMIC_enableChannel(64 + band);
}
void  LMIC_disableSubBand(u1_t band) {
        ASSERT(band < 8);
        u1_t start = band * 8;
        u1_t end = start + 8;

        // disable all eight 125 kHz channels in this subband
        for (int channel = start; channel < end; ++channel)
                LMIC_disableChannel(channel);

        // there's a single 500 kHz channel associated with
        // each group of 8 125 kHz channels. Disable it, too.
        LMIC_disableChannel(64 + band);
}
void  LMIC_selectSubBand(u1_t band) {
        ASSERT(band < 8);
        for (int b = 0; b<8; ++b) {
                if (band == b)
                        LMIC_enableSubBand(b);
                else
                        LMIC_disableSubBand(b);
        }
}

void LMICau921_updateTx(ostime_t txbeg) {
        u1_t chnl = LMIC.txChnl;
        LMIC.txpow = AU921_TX_EIRP_MAX_DBM;
        if (chnl < 64) {
                LMIC.freq = AU921_125kHz_UPFBASE + chnl*AU921_125kHz_UPFSTEP;
        } else {
                ASSERT(chnl < 64 + 8);
                LMIC.freq = AU921_500kHz_UPFBASE + (chnl - 64)*AU921_500kHz_UPFSTEP;
        }

        // 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 LMICau921_setBcnRxParams(void) {
        LMIC.dataLen = 0;
        LMIC.freq = AU921_500kHz_DNFBASE + LMIC.bcnChnl * AU921_500kHz_DNFSTEP;
        LMIC.rps = setIh(setNocrc(dndr2rps((dr_t)DR_BCN), 1), LEN_BCN);
}
#endif // !DISABLE_BEACONS

// set the Rx1 dndr, rps.
void LMICau921_setRx1Params(void) {
        u1_t const txdr = LMIC.dndr;
        u1_t candidateDr;
        LMIC.freq = AU921_500kHz_DNFBASE + (LMIC.txChnl & 0x7) * AU921_500kHz_DNFSTEP;
        if ( /* TX datarate */txdr < AU921_DR_SF8C)
                candidateDr = txdr + 8 - LMIC.rx1DrOffset;
        else
                candidateDr = AU921_DR_SF7CR;

        if (candidateDr < LORAWAN_DR8)
                candidateDr = LORAWAN_DR8;
        else if (candidateDr > LORAWAN_DR13)
                candidateDr = LORAWAN_DR13;

        LMIC.dndr = candidateDr;
        LMIC.rps = dndr2rps(LMIC.dndr);
}


//
// END: AU921 related stuff
//
// ================================================================================
#endif