LoRaPHYCN470.cpp

00001 /**
00002  *  @file LoRaPHYCN470.cpp
00003  *
00004  *  @brief Implements LoRaPHY for Chinese 470 MHz band
00005  *
00006  *  \code
00007  *   ______                              _
00008  *  / _____)             _              | |
00009  * ( (____  _____ ____ _| |_ _____  ____| |__
00010  *  \____ \| ___ |    (_   _) ___ |/ ___)  _ \
00011  *  _____) ) ____| | | || |_| ____( (___| | | |
00012  * (______/|_____)_|_|_| \__)_____)\____)_| |_|
00013  *   (C)2013 Semtech
00014  *  ___ _____ _   ___ _  _____ ___  ___  ___ ___
00015  * / __|_   _/_\ / __| |/ / __/ _ \| _ \/ __| __|
00016  * \__ \ | |/ _ \ (__| ' <| _| (_) |   / (__| _|
00017  * |___/ |_/_/ \_\___|_|\_\_| \___/|_|_\\___|___|
00018  * embedded.connectivity.solutions===============
00019  *
00020  * \endcode
00021  *
00022  *
00023  * License: Revised BSD License, see LICENSE.TXT file include in the project
00024  *
00025  * Maintainer: Miguel Luis ( Semtech ), Gregory Cristian ( Semtech ) and Daniel Jaeckle ( STACKFORCE )
00026  *
00027  * Copyright (c) 2017, Arm Limited and affiliates.
00028  * SPDX-License-Identifier: BSD-3-Clause
00029  *
00030  */
00031 
00032 #include "LoRaPHYCN470.h"
00033 #include "lora_phy_ds.h"
00034 
00035 /*!
00036  * Minimal datarate that can be used by the node
00037  */
00038 #define CN470_TX_MIN_DATARATE                       DR_0
00039 
00040 /*!
00041  * Maximal datarate that can be used by the node
00042  */
00043 #define CN470_TX_MAX_DATARATE                       DR_5
00044 
00045 /*!
00046  * Minimal datarate that can be used by the node
00047  */
00048 #define CN470_RX_MIN_DATARATE                       DR_0
00049 
00050 /*!
00051  * Maximal datarate that can be used by the node
00052  */
00053 #define CN470_RX_MAX_DATARATE                       DR_5
00054 
00055 /*!
00056  * Default datarate used by the node
00057  */
00058 #define CN470_DEFAULT_DATARATE                      DR_0
00059 
00060 /*!
00061  * Minimal Rx1 receive datarate offset
00062  */
00063 #define CN470_MIN_RX1_DR_OFFSET                     0
00064 
00065 /*!
00066  * Maximal Rx1 receive datarate offset
00067  */
00068 #define CN470_MAX_RX1_DR_OFFSET                     3
00069 
00070 /*!
00071  * Default Rx1 receive datarate offset
00072  */
00073 #define CN470_DEFAULT_RX1_DR_OFFSET                 0
00074 
00075 /*!
00076  * Minimal Tx output power that can be used by the node
00077  */
00078 #define CN470_MIN_TX_POWER                        TX_POWER_7
00079 
00080 /*!
00081  * Maximal Tx output power that can be used by the node
00082  */
00083 #define CN470_MAX_TX_POWER                        TX_POWER_0
00084 
00085 /*!
00086  * Default Tx output power used by the node
00087  */
00088 #define CN470_DEFAULT_TX_POWER                    TX_POWER_0
00089 
00090 /*!
00091  * Default Max EIRP
00092  */
00093 #define CN470_DEFAULT_MAX_EIRP                      19.15f
00094 
00095 /*!
00096  * Default antenna gain
00097  */
00098 #define CN470_DEFAULT_ANTENNA_GAIN                  2.15f
00099 
00100 /*!
00101  * ADR Ack limit
00102  */
00103 #define CN470_ADR_ACK_LIMIT                         64
00104 
00105 /*!
00106  * ADR Ack delay
00107  */
00108 #define CN470_ADR_ACK_DELAY                         32
00109 
00110 /*!
00111  * Enabled or disabled the duty cycle
00112  */
00113 #define CN470_DUTY_CYCLE_ENABLED                    0
00114 
00115 /*!
00116  * Maximum RX window duration
00117  */
00118 #define CN470_MAX_RX_WINDOW                         3000
00119 
00120 /*!
00121  * Receive delay 1
00122  */
00123 #define CN470_RECEIVE_DELAY1                        1000
00124 
00125 /*!
00126  * Receive delay 2
00127  */
00128 #define CN470_RECEIVE_DELAY2                        2000
00129 
00130 /*!
00131  * Join accept delay 1
00132  */
00133 #define CN470_JOIN_ACCEPT_DELAY1                    5000
00134 
00135 /*!
00136  * Join accept delay 2
00137  */
00138 #define CN470_JOIN_ACCEPT_DELAY2                    6000
00139 
00140 /*!
00141  * Maximum frame counter gap
00142  */
00143 #define CN470_MAX_FCNT_GAP                          16384
00144 
00145 /*!
00146  * Ack timeout
00147  */
00148 #define CN470_ACKTIMEOUT                            2000
00149 
00150 /*!
00151  * Random ack timeout limits
00152  */
00153 #define CN470_ACK_TIMEOUT_RND                       1000
00154 
00155 /*!
00156  * Second reception window channel frequency definition.
00157  */
00158 #define CN470_RX_WND_2_FREQ                         505300000
00159 
00160 /*!
00161  * Second reception window channel datarate definition.
00162  */
00163 #define CN470_RX_WND_2_DR                           DR_0
00164 
00165 /*!
00166  * Band 0 definition
00167  * { DutyCycle, TxMaxPower, LastJoinTxDoneTime, LastTxDoneTime, TimeOff }
00168  */
00169 static const band_t  CN470_BAND0  = {1, CN470_MAX_TX_POWER, 0, 0, 0}; //  100.0 %
00170 
00171 /*!
00172  * Defines the first channel for RX window 1 for CN470 band
00173  */
00174 #define CN470_FIRST_RX1_CHANNEL                     ((uint32_t) 500300000)
00175 
00176 /*!
00177  * Defines the last channel for RX window 1 for CN470 band
00178  */
00179 #define CN470_LAST_RX1_CHANNEL                      ((uint32_t) 509700000)
00180 
00181 /*!
00182  * Defines the step width of the channels for RX window 1
00183  */
00184 #define CN470_STEPWIDTH_RX1_CHANNEL                 ((uint32_t) 200000)
00185 
00186 /*!
00187  * Data rates table definition
00188  */
00189 static const uint8_t datarates_CN470 []  = {12, 11, 10,  9,  8,  7};
00190 
00191 /*!
00192  * Bandwidths table definition in Hz
00193  */
00194 static const uint32_t bandwidths_CN470 [] = {125000, 125000, 125000, 125000, 125000, 125000};
00195 
00196 /*!
00197  * Maximum payload with respect to the datarate index. Cannot operate with repeater.
00198  */
00199 static const uint8_t max_payloads_CN470 [] = {51, 51, 51, 115, 222, 222};
00200 
00201 /*!
00202  * Maximum payload with respect to the datarate index. Can operate with repeater.
00203  */
00204 static const uint8_t max_payloads_with_repeater_CN470 [] = {51, 51, 51, 115, 222, 222};
00205 
00206 
00207 LoRaPHYCN470::LoRaPHYCN470()
00208 {
00209     static const uint16_t fsb_mask[] = MBED_CONF_LORA_FSB_MASK_CHINA;
00210 
00211     bands[0] = CN470_BAND0 ;
00212 
00213     // Channels
00214     // 125 kHz channels
00215     for( uint8_t i = 0; i < CN470_MAX_NB_CHANNELS; i++ )
00216     {
00217         channels[i].frequency = 470300000 + i * 200000;
00218         channels[i].dr_range.value = ( DR_5 << 4 ) | DR_0;
00219         channels[i].band = 0;
00220     }
00221 
00222     // Initialize the channels default mask
00223     for (uint8_t i = 0; i < CN470_CHANNEL_MASK_SIZE; i++) {
00224         default_channel_mask[i] = 0xFFFF & fsb_mask[i];
00225     }
00226 
00227     // Update the channels mask
00228     copy_channel_mask(channel_mask, default_channel_mask, CN470_CHANNEL_MASK_SIZE);
00229 
00230     // set default channels
00231     phy_params.channels.channel_list = channels;
00232     phy_params.channels.channel_list_size = CN470_MAX_NB_CHANNELS;
00233     phy_params.channels.mask = channel_mask;
00234     phy_params.channels.default_mask = default_channel_mask;
00235     phy_params.channels.mask_size = CN470_CHANNEL_MASK_SIZE;
00236 
00237     // set bands for CN470 spectrum
00238     phy_params.bands.table = (void *) bands;
00239     phy_params.bands.size = CN470_MAX_NB_BANDS;
00240 
00241     // set bandwidths available in CN470 spectrum
00242     phy_params.bandwidths.table = (void *) bandwidths_CN470 ;
00243     phy_params.bandwidths.size = 6;
00244 
00245     // set data rates available in CN470 spectrum
00246     phy_params.datarates.table = (void *) datarates_CN470 ;
00247     phy_params.datarates.size = 6;
00248 
00249     // set payload sizes with respect to data rates
00250     phy_params.payloads.table = (void *) max_payloads_CN470 ;
00251     phy_params.payloads.size = 6;
00252     phy_params.payloads_with_repeater.table = (void *)max_payloads_with_repeater_CN470 ;
00253     phy_params.payloads_with_repeater.size = 6;
00254 
00255     // dwell time setting
00256     phy_params.ul_dwell_time_setting = 0;
00257     phy_params.dl_dwell_time_setting = 0;
00258 
00259     // set initial and default parameters
00260     phy_params.duty_cycle_enabled = CN470_DUTY_CYCLE_ENABLED;
00261 
00262     phy_params.accept_tx_param_setup_req = false;
00263     phy_params.fsk_supported = false;
00264     phy_params.cflist_supported = false;
00265     phy_params.dl_channel_req_supported = false;
00266     phy_params.custom_channelplans_supported = false;
00267 
00268     phy_params.default_channel_cnt = CN470_MAX_NB_CHANNELS;
00269     phy_params.max_channel_cnt = CN470_MAX_NB_CHANNELS;
00270     phy_params.cflist_channel_cnt = 0;
00271     phy_params.min_tx_datarate = CN470_TX_MIN_DATARATE;
00272     phy_params.max_tx_datarate = CN470_TX_MAX_DATARATE;
00273     phy_params.min_rx_datarate = CN470_RX_MIN_DATARATE;
00274     phy_params.max_rx_datarate = CN470_RX_MAX_DATARATE;
00275     phy_params.default_datarate = CN470_DEFAULT_DATARATE;
00276     phy_params.default_max_datarate = CN470_TX_MAX_DATARATE;
00277     phy_params.min_rx1_dr_offset = CN470_MIN_RX1_DR_OFFSET;
00278     phy_params.max_rx1_dr_offset = CN470_MAX_RX1_DR_OFFSET;
00279     phy_params.default_rx1_dr_offset = CN470_DEFAULT_RX1_DR_OFFSET;
00280     phy_params.min_tx_power = CN470_MIN_TX_POWER;
00281     phy_params.max_tx_power = CN470_MAX_TX_POWER;
00282     phy_params.default_tx_power = CN470_DEFAULT_TX_POWER;
00283     phy_params.default_max_eirp = CN470_DEFAULT_MAX_EIRP;
00284     phy_params.default_antenna_gain = CN470_DEFAULT_ANTENNA_GAIN;
00285     phy_params.adr_ack_limit = CN470_ADR_ACK_LIMIT;
00286     phy_params.adr_ack_delay = CN470_ADR_ACK_DELAY;
00287     phy_params.max_rx_window = CN470_MAX_RX_WINDOW;
00288     phy_params.recv_delay1 = CN470_RECEIVE_DELAY1;
00289     phy_params.recv_delay2 = CN470_RECEIVE_DELAY2;
00290 
00291     phy_params.join_accept_delay1 = CN470_JOIN_ACCEPT_DELAY1;
00292     phy_params.join_accept_delay2 = CN470_JOIN_ACCEPT_DELAY2;
00293     phy_params.max_fcnt_gap = CN470_MAX_FCNT_GAP;
00294     phy_params.ack_timeout = CN470_ACKTIMEOUT;
00295     phy_params.ack_timeout_rnd = CN470_ACK_TIMEOUT_RND;
00296     phy_params.rx_window2_datarate = CN470_RX_WND_2_DR;
00297     phy_params.rx_window2_frequency = CN470_RX_WND_2_FREQ;
00298 }
00299 
00300 LoRaPHYCN470::~LoRaPHYCN470()
00301 {
00302 }
00303 
00304 lorawan_status_t LoRaPHYCN470::set_next_channel(channel_selection_params_t *params,
00305                                                 uint8_t *channel, lorawan_time_t *time,
00306                                                 lorawan_time_t *aggregate_timeoff)
00307 {
00308     uint8_t channel_count = 0;
00309     uint8_t delay_tx = 0;
00310 
00311     uint8_t enabled_channels[CN470_MAX_NB_CHANNELS] = {0};
00312 
00313     lorawan_time_t next_tx_delay = 0;
00314     band_t  *band_table = (band_t  *) phy_params.bands.table;
00315 
00316     if (num_active_channels(phy_params.channels.mask, 0,
00317                             phy_params.channels.mask_size) == 0) {
00318 
00319         // Reactivate default channels
00320         copy_channel_mask(phy_params.channels.mask,
00321                           phy_params.channels.default_mask,
00322                           phy_params.channels.mask_size);
00323     }
00324 
00325     if (params->aggregate_timeoff
00326             <= _lora_time->get_elapsed_time(params->last_aggregate_tx_time)) {
00327         // Reset Aggregated time off
00328         *aggregate_timeoff = 0;
00329 
00330         // Update bands Time OFF
00331         next_tx_delay = update_band_timeoff(params->joined,
00332                                             params->dc_enabled,
00333                                             band_table, phy_params.bands.size);
00334 
00335         // Search how many channels are enabled
00336         channel_count = enabled_channel_count(params->current_datarate,
00337                                               phy_params.channels.mask,
00338                                               enabled_channels, &delay_tx);
00339     } else {
00340         delay_tx++;
00341         next_tx_delay = params->aggregate_timeoff -
00342                         _lora_time->get_elapsed_time(params->last_aggregate_tx_time);
00343     }
00344 
00345     if (channel_count > 0) {
00346         // We found a valid channel
00347         *channel = enabled_channels[get_random(0, channel_count - 1)];
00348         *time = 0;
00349         return LORAWAN_STATUS_OK;
00350     }
00351 
00352     if (delay_tx > 0) {
00353         // Delay transmission due to AggregatedTimeOff or to a band time off
00354         *time = next_tx_delay;
00355         return LORAWAN_STATUS_DUTYCYCLE_RESTRICTED;
00356     }
00357 
00358     *time = 0;
00359     return LORAWAN_STATUS_NO_CHANNEL_FOUND;
00360 }
00361 
00362 bool LoRaPHYCN470::rx_config(rx_config_params_t * config)
00363 {
00364     int8_t dr = config->datarate ;
00365     uint8_t max_payload = 0;
00366     int8_t phy_dr = 0;
00367     uint32_t frequency = config->frequency ;
00368 
00369     _radio->lock();
00370 
00371     if (_radio->get_status() != RF_IDLE) {
00372         _radio->unlock();
00373         return false;
00374     }
00375 
00376     _radio->unlock();
00377 
00378     if( config->rx_slot  == RX_SLOT_WIN_1  )
00379     {
00380         // Apply window 1 frequency
00381         frequency = CN470_FIRST_RX1_CHANNEL + (config->channel  % 48) * CN470_STEPWIDTH_RX1_CHANNEL;
00382     }
00383 
00384     // Read the physical datarate from the datarates table
00385     phy_dr = datarates_CN470 [dr];
00386 
00387     _radio->lock();
00388 
00389     _radio->set_channel(frequency);
00390 
00391     // Radio configuration
00392     _radio->set_rx_config(MODEM_LORA, config->bandwidth , phy_dr, 1, 0,
00393                           MBED_CONF_LORA_DOWNLINK_PREAMBLE_LENGTH,
00394                           config->window_timeout , false, 0, false, 0, 0, true,
00395                           config->is_rx_continuous );
00396 
00397     _radio->unlock();
00398 
00399     if (config->is_repeater_supported  == true) {
00400         max_payload = max_payloads_with_repeater_CN470 [dr];
00401     } else {
00402         max_payload = max_payloads_CN470 [dr];
00403     }
00404 
00405     _radio->lock();
00406     _radio->set_max_payload_length(MODEM_LORA, max_payload + LORA_MAC_FRMPAYLOAD_OVERHEAD);
00407     _radio->unlock();
00408 
00409     return true;
00410 }
00411 
00412 bool LoRaPHYCN470::tx_config(tx_config_params_t* config, int8_t* tx_power,
00413                              lorawan_time_t* tx_toa)
00414 {
00415     int8_t phy_dr = datarates_CN470 [config->datarate];
00416 
00417     if (config->tx_power > bands[channels[config->channel].band].max_tx_pwr) {
00418         config->tx_power = bands[channels[config->channel].band].max_tx_pwr;
00419     }
00420 
00421     int8_t phy_tx_power = 0;
00422 
00423     // Calculate physical TX power
00424     phy_tx_power = compute_tx_power(config->tx_power, config->max_eirp,
00425                                     config->antenna_gain);
00426 
00427     // acquire lock to radio
00428     _radio->lock();
00429 
00430     _radio->set_channel(channels[config->channel].frequency);
00431 
00432    _radio->set_tx_config(MODEM_LORA, phy_tx_power, 0, 0, phy_dr, 1,
00433                          MBED_CONF_LORA_UPLINK_PREAMBLE_LENGTH, false, true,
00434                          0, 0, false, 3000);
00435     // Setup maximum payload lenght of the radio driver
00436     _radio->set_max_payload_length(MODEM_LORA, config->pkt_len);
00437 
00438     // Get the time-on-air of the next tx frame
00439     *tx_toa = _radio->time_on_air(MODEM_LORA, config->pkt_len);
00440 
00441     // release lock to radio
00442     _radio->unlock();
00443 
00444     *tx_power = config->tx_power;
00445 
00446     return true;
00447 }
00448 
00449 uint8_t LoRaPHYCN470::link_ADR_request(adr_req_params_t* params,
00450                                        int8_t* dr_out, int8_t* tx_power_out,
00451                                        uint8_t* nb_rep_out,
00452                                        uint8_t* nb_bytes_parsed)
00453 {
00454     uint8_t status = 0x07;
00455     link_adr_params_t adr_settings;
00456     uint8_t next_index = 0;
00457     uint8_t bytes_processed = 0;
00458     uint16_t temp_channel_masks[CN470_CHANNEL_MASK_SIZE] = {0, 0, 0, 0, 0, 0};
00459 
00460     verify_adr_params_t verify_params;
00461 
00462     // Initialize local copy of channels mask
00463     copy_channel_mask(temp_channel_masks, channel_mask, CN470_CHANNEL_MASK_SIZE);
00464 
00465     while(bytes_processed < params->payload_size) {
00466 
00467         // Get ADR request parameters
00468         next_index = parse_link_ADR_req(&(params->payload [bytes_processed]), &adr_settings);
00469 
00470         if (next_index == 0) {
00471             break; // break loop, since no more request has been found
00472         }
00473 
00474         // Update bytes processed
00475         bytes_processed += next_index;
00476 
00477         // Revert status, as we only check the last ADR request for the channel mask KO
00478         status = 0x07;
00479 
00480         if (adr_settings.ch_mask_ctrl == 6) {
00481 
00482             // Enable all 125 kHz channels
00483             for (uint8_t i = 0; i < CN470_CHANNEL_MASK_SIZE; i++) {
00484                 temp_channel_masks[i] = 0xFFFF;
00485             }
00486 
00487         } else if( adr_settings.ch_mask_ctrl == 7 ) {
00488 
00489             status &= 0xFE; // Channel mask KO
00490 
00491         } else {
00492 
00493             for (uint8_t i = 0; i < 16; i++) {
00494 
00495                 if (((adr_settings.channel_mask & (1 << i)) != 0 ) &&
00496                     (channels[adr_settings.ch_mask_ctrl * 16 + i].frequency == 0)) {
00497                     // Trying to enable an undefined channel
00498                     status &= 0xFE; // Channel mask KO
00499                 }
00500             }
00501 
00502             temp_channel_masks[adr_settings.ch_mask_ctrl] = adr_settings.channel_mask;
00503         }
00504     }
00505 
00506     verify_params.status  = status;
00507     verify_params.adr_enabled  = params->adr_enabled ;
00508     verify_params.datarate  = adr_settings.datarate;
00509     verify_params.tx_power  = adr_settings.tx_power;
00510     verify_params.nb_rep  = adr_settings.nb_rep;
00511     verify_params.current_datarate  = params->current_datarate ;
00512     verify_params.current_tx_power  = params->current_tx_power ;
00513     verify_params.current_nb_rep  = params->current_nb_rep ;
00514     verify_params.channel_mask  = temp_channel_masks;
00515 
00516 
00517     // Verify the parameters and update, if necessary
00518     status = verify_link_ADR_req(&verify_params, &adr_settings.datarate,
00519                                  &adr_settings.tx_power, &adr_settings.nb_rep);
00520 
00521     // Update channelsMask if everything is correct
00522     if (status == 0x07) {
00523         // Copy Mask
00524         copy_channel_mask(channel_mask, temp_channel_masks, CN470_CHANNEL_MASK_SIZE);
00525     }
00526 
00527     // Update status variables
00528     *dr_out = adr_settings.datarate;
00529     *tx_power_out = adr_settings.tx_power;
00530     *nb_rep_out = adr_settings.nb_rep;
00531     *nb_bytes_parsed = bytes_processed;
00532 
00533     return status;
00534 }
00535 
00536 uint8_t LoRaPHYCN470::accept_rx_param_setup_req(rx_param_setup_req_t* params)
00537 {
00538     uint8_t status = 0x07;
00539     uint32_t freq = params->frequency;
00540 
00541     // acquire radio lock
00542     _radio->lock();
00543 
00544     if ((_radio->check_rf_frequency(freq) == false)
00545             || (freq < CN470_FIRST_RX1_CHANNEL)
00546             || (freq > CN470_LAST_RX1_CHANNEL)
00547             || (((freq - (uint32_t) CN470_FIRST_RX1_CHANNEL) % (uint32_t) CN470_STEPWIDTH_RX1_CHANNEL) != 0)) {
00548 
00549         status &= 0xFE; // Channel frequency KO
00550     }
00551 
00552     // release radio lock
00553     _radio->unlock();
00554 
00555     // Verify datarate
00556     if (val_in_range(params->datarate, CN470_RX_MIN_DATARATE, CN470_RX_MAX_DATARATE) == 0) {
00557         status &= 0xFD; // Datarate KO
00558     }
00559 
00560     // Verify datarate offset
00561     if (val_in_range(params->dr_offset, CN470_MIN_RX1_DR_OFFSET, CN470_MAX_RX1_DR_OFFSET) == 0) {
00562         status &= 0xFB; // Rx1DrOffset range KO
00563     }
00564 
00565     return status;
00566 }