Embed:
(wiki syntax)
Show/hide line numbers
LoRaPHYAU915.cpp
Go to the documentation of this file.
00001 /** 00002 * @file LoRaPHYAU915.cpp 00003 * 00004 * @brief Implements LoRaPHY for Australian 915 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 "LoRaPHYAU915.h" 00033 #include "lora_phy_ds.h" 00034 00035 /*! 00036 * Minimal datarate that can be used by the node 00037 */ 00038 #define AU915_TX_MIN_DATARATE DR_0 00039 00040 /*! 00041 * Maximal datarate that can be used by the node 00042 */ 00043 #define AU915_TX_MAX_DATARATE DR_6 00044 00045 /*! 00046 * Minimal datarate that can be used by the node 00047 */ 00048 #define AU915_RX_MIN_DATARATE DR_8 00049 00050 /*! 00051 * Maximal datarate that can be used by the node 00052 */ 00053 #define AU915_RX_MAX_DATARATE DR_13 00054 00055 /*! 00056 * Default datarate used by the node 00057 */ 00058 #define AU915_DEFAULT_DATARATE DR_0 00059 00060 /*! 00061 * Minimal Rx1 receive datarate offset 00062 */ 00063 #define AU915_MIN_RX1_DR_OFFSET 0 00064 00065 /*! 00066 * Maximal Rx1 receive datarate offset 00067 */ 00068 #define AU915_MAX_RX1_DR_OFFSET 6 00069 00070 /*! 00071 * Default Rx1 receive datarate offset 00072 */ 00073 #define AU915_DEFAULT_RX1_DR_OFFSET 0 00074 00075 /*! 00076 * Minimal Tx output power that can be used by the node 00077 */ 00078 #define AU915_MIN_TX_POWER TX_POWER_10 00079 00080 /*! 00081 * Maximal Tx output power that can be used by the node 00082 */ 00083 #define AU915_MAX_TX_POWER TX_POWER_0 00084 00085 /*! 00086 * Default Tx output power used by the node 00087 */ 00088 #define AU915_DEFAULT_TX_POWER TX_POWER_0 00089 00090 /*! 00091 * Default Max EIRP 00092 */ 00093 #define AU915_DEFAULT_MAX_EIRP 30.0f 00094 00095 /*! 00096 * Default antenna gain 00097 */ 00098 #define AU915_DEFAULT_ANTENNA_GAIN 2.15f 00099 00100 /*! 00101 * ADR Ack limit 00102 */ 00103 #define AU915_ADR_ACK_LIMIT 64 00104 00105 /*! 00106 * ADR Ack delay 00107 */ 00108 #define AU915_ADR_ACK_DELAY 32 00109 00110 /*! 00111 * Enabled or disabled the duty cycle 00112 */ 00113 #define AU915_DUTY_CYCLE_ENABLED 0 00114 00115 /*! 00116 * Maximum RX window duration 00117 */ 00118 #define AU915_MAX_RX_WINDOW 3000 00119 00120 /*! 00121 * Receive delay 1 00122 */ 00123 #define AU915_RECEIVE_DELAY1 1000 00124 00125 /*! 00126 * Receive delay 2 00127 */ 00128 #define AU915_RECEIVE_DELAY2 2000 00129 00130 /*! 00131 * Join accept delay 1 00132 */ 00133 #define AU915_JOIN_ACCEPT_DELAY1 5000 00134 00135 /*! 00136 * Join accept delay 2 00137 */ 00138 #define AU915_JOIN_ACCEPT_DELAY2 6000 00139 00140 /*! 00141 * Maximum frame counter gap 00142 */ 00143 #define AU915_MAX_FCNT_GAP 16384 00144 00145 /*! 00146 * Ack timeout 00147 */ 00148 #define AU915_ACKTIMEOUT 2000 00149 00150 /*! 00151 * Random ack timeout limits 00152 */ 00153 #define AU915_ACK_TIMEOUT_RND 1000 00154 00155 /*! 00156 * Second reception window channel frequency definition. 00157 */ 00158 #define AU915_RX_WND_2_FREQ 923300000 00159 00160 /*! 00161 * Second reception window channel datarate definition. 00162 */ 00163 #define AU915_RX_WND_2_DR DR_8 00164 00165 /*! 00166 * Band 0 definition 00167 * { DutyCycle, TxMaxPower, LastJoinTxDoneTime, LastTxDoneTime, TimeOff } 00168 */ 00169 static const band_t AU915_BAND0 = {1, AU915_MAX_TX_POWER, 0, 0, 0, 915200000, 927800000}; // 100.0 % 00170 00171 /*! 00172 * Defines the first channel for RX window 1 for US band 00173 */ 00174 #define AU915_FIRST_RX1_CHANNEL ((uint32_t) 923300000) 00175 00176 /*! 00177 * Defines the last channel for RX window 1 for US band 00178 */ 00179 #define AU915_LAST_RX1_CHANNEL ((uint32_t) 927500000) 00180 00181 /*! 00182 * Defines the step width of the channels for RX window 1 00183 */ 00184 #define AU915_STEPWIDTH_RX1_CHANNEL ((uint32_t) 600000) 00185 00186 /*! 00187 * Data rates table definition 00188 */ 00189 static const uint8_t datarates_AU915 [] = {12, 11, 10, 9, 8, 7, 8, 0, 12, 11, 10, 9, 8, 7, 0, 0}; 00190 00191 /*! 00192 * Bandwidths table definition in Hz 00193 */ 00194 static const uint32_t bandwidths_AU915 [] = { 125000, 125000, 125000, 125000, 00195 125000, 125000, 500000, 0, 500000, 500000, 500000, 500000, 500000, 500000, 00196 0, 0 }; 00197 00198 /*! 00199 * Up/Down link data rates offset definition 00200 */ 00201 static const int8_t datarate_offsets_AU915 [7][6] = { { DR_8, DR_8, DR_8, DR_8, 00202 DR_8, DR_8 }, // DR_0 00203 { DR_9, DR_8, DR_8, DR_8, DR_8, DR_8 }, // DR_1 00204 { DR_10, DR_9, DR_8, DR_8, DR_8, DR_8 }, // DR_2 00205 { DR_11, DR_10, DR_9, DR_8, DR_8, DR_8 }, // DR_3 00206 { DR_12, DR_11, DR_10, DR_9, DR_8, DR_8 }, // DR_4 00207 { DR_13, DR_12, DR_11, DR_10, DR_9, DR_8 }, // DR_5 00208 { DR_13, DR_13, DR_12, DR_11, DR_10, DR_9 }, // DR_6 00209 }; 00210 00211 /*! 00212 * Maximum payload with respect to the datarate index. Cannot operate with repeater. 00213 */ 00214 static const uint8_t max_payload_AU915 [] = { 51, 51, 51, 115, 242, 242, 00215 242, 0, 53, 129, 242, 242, 242, 242, 0, 0 }; 00216 00217 /*! 00218 * Maximum payload with respect to the datarate index. Can operate with repeater. 00219 */ 00220 static const uint8_t max_payload_with_repeater_AU915 [] = { 51, 51, 51, 115, 00221 222, 222, 222, 0, 33, 109, 222, 222, 222, 222, 0, 0 }; 00222 00223 00224 LoRaPHYAU915::LoRaPHYAU915(LoRaWANTimeHandler &lora_time) 00225 : LoRaPHY(lora_time) 00226 { 00227 bands[0] = AU915_BAND0 ; 00228 00229 // Activate Channels 00230 // 125 kHz channels Upstream only 00231 for (uint8_t i = 0; i < AU915_MAX_NB_CHANNELS - 8; i++) { 00232 channels[i].frequency = 915200000 + i * 200000; 00233 channels[i].dr_range.value = ( DR_5 << 4) | DR_0; 00234 channels[i].band = 0; 00235 } 00236 // 500 kHz channels 00237 // Upstream and downstream both 00238 for (uint8_t i = AU915_MAX_NB_CHANNELS - 8; i < AU915_MAX_NB_CHANNELS; i++) { 00239 channels[i].frequency = 915900000 + (i - ( AU915_MAX_NB_CHANNELS - 8)) * 1600000; 00240 channels[i].dr_range.value = ( DR_6 << 4) | DR_6; 00241 channels[i].band = 0; 00242 } 00243 00244 // Initialize channels default mask 00245 // All channels are default channels here 00246 // Join request needs to alternate between 125 KHz and 500 KHz channels 00247 // randomly. 00248 default_channel_mask[0] = 0xFFFF; 00249 default_channel_mask[1] = 0xFFFF; 00250 default_channel_mask[2] = 0xFFFF; 00251 default_channel_mask[3] = 0xFFFF; 00252 default_channel_mask[4] = 0x00FF; 00253 00254 memset(channel_mask, 0, sizeof(channel_mask)); 00255 memset(current_channel_mask, 0, sizeof(current_channel_mask)); 00256 00257 // Copy channels default mask 00258 copy_channel_mask(channel_mask, default_channel_mask, AU915_CHANNEL_MASK_SIZE); 00259 00260 // Copy into current channels mask 00261 // This mask is used to keep track of the channels which were used in 00262 // previous transmissions as the AU915 band doesn't allow concurrent 00263 // transmission on the same channel 00264 copy_channel_mask(current_channel_mask, channel_mask, AU915_CHANNEL_MASK_SIZE); 00265 00266 // set bands for EU868 spectrum 00267 phy_params.bands.table = (void *) bands; 00268 phy_params.bands.size = AU915_MAX_NB_BANDS; 00269 00270 // set bandwidths available in EU868 spectrum 00271 phy_params.bandwidths.table = (void *) bandwidths_AU915 ; 00272 phy_params.bandwidths.size = 16; 00273 00274 // set data rates available in EU868 spectrum 00275 phy_params.datarates.table = (void *) datarates_AU915 ; 00276 phy_params.datarates.size = 16; 00277 00278 // set payload sizes with respect to data rates 00279 phy_params.payloads.table = (void *) max_payload_AU915 ; 00280 phy_params.payloads.size = 16; 00281 phy_params.payloads_with_repeater.table = (void *) max_payload_with_repeater_AU915 ; 00282 phy_params.payloads_with_repeater.size = 16; 00283 00284 // dwell time setting 00285 phy_params.ul_dwell_time_setting = 0; 00286 phy_params.dl_dwell_time_setting = 0; 00287 phy_params.dwell_limit_datarate = AU915_DEFAULT_DATARATE; 00288 00289 phy_params.duty_cycle_enabled = AU915_DUTY_CYCLE_ENABLED; 00290 phy_params.accept_tx_param_setup_req = false; 00291 phy_params.custom_channelplans_supported = false; 00292 phy_params.cflist_supported = false; 00293 phy_params.fsk_supported = false; 00294 00295 phy_params.default_channel_cnt = AU915_MAX_NB_CHANNELS; 00296 phy_params.max_channel_cnt = AU915_MAX_NB_CHANNELS; 00297 phy_params.cflist_channel_cnt = 0; 00298 phy_params.min_tx_datarate = AU915_TX_MIN_DATARATE; 00299 phy_params.max_tx_datarate = AU915_TX_MAX_DATARATE; 00300 phy_params.min_rx_datarate = AU915_RX_MIN_DATARATE; 00301 phy_params.max_rx_datarate = AU915_RX_MAX_DATARATE; 00302 phy_params.default_datarate = AU915_DEFAULT_DATARATE; 00303 phy_params.default_max_datarate = AU915_TX_MAX_DATARATE; 00304 phy_params.min_rx1_dr_offset = AU915_MIN_RX1_DR_OFFSET; 00305 phy_params.max_rx1_dr_offset = AU915_MAX_RX1_DR_OFFSET; 00306 phy_params.default_rx1_dr_offset = AU915_DEFAULT_RX1_DR_OFFSET; 00307 phy_params.min_tx_power = AU915_MIN_TX_POWER; 00308 phy_params.max_tx_power = AU915_MAX_TX_POWER; 00309 phy_params.default_tx_power = AU915_DEFAULT_TX_POWER; 00310 phy_params.default_max_eirp = AU915_DEFAULT_MAX_EIRP; 00311 phy_params.default_antenna_gain = AU915_DEFAULT_ANTENNA_GAIN; 00312 phy_params.adr_ack_limit = AU915_ADR_ACK_LIMIT; 00313 phy_params.adr_ack_delay = AU915_ADR_ACK_DELAY; 00314 phy_params.max_rx_window = AU915_MAX_RX_WINDOW; 00315 phy_params.recv_delay1 = AU915_RECEIVE_DELAY1; 00316 phy_params.recv_delay2 = AU915_RECEIVE_DELAY2; 00317 00318 phy_params.join_accept_delay1 = AU915_JOIN_ACCEPT_DELAY1; 00319 phy_params.join_accept_delay2 = AU915_JOIN_ACCEPT_DELAY2; 00320 phy_params.max_fcnt_gap = AU915_MAX_FCNT_GAP; 00321 phy_params.ack_timeout = AU915_ACKTIMEOUT; 00322 phy_params.ack_timeout_rnd = AU915_ACK_TIMEOUT_RND; 00323 phy_params.rx_window2_datarate = AU915_RX_WND_2_DR; 00324 phy_params.rx_window2_frequency = AU915_RX_WND_2_FREQ; 00325 } 00326 00327 LoRaPHYAU915::~LoRaPHYAU915() 00328 { 00329 } 00330 00331 bool LoRaPHYAU915::rx_config(rx_config_params_t * params, int8_t* datarate) 00332 { 00333 int8_t dr = params->datarate ; 00334 uint8_t max_payload = 0; 00335 int8_t phy_dr = 0; 00336 uint32_t frequency = params->frequency ; 00337 00338 if (_radio->get_status() != RF_IDLE) { 00339 return false; 00340 } 00341 00342 if (params->rx_slot == RX_SLOT_WIN_1 ) { 00343 // Apply window 1 frequency 00344 frequency = AU915_FIRST_RX1_CHANNEL 00345 + (params->channel % 8) * AU915_STEPWIDTH_RX1_CHANNEL; 00346 } 00347 00348 // Read the physical datarate from the datarates table 00349 phy_dr = datarates_AU915 [dr]; 00350 00351 _radio->lock(); 00352 00353 _radio->set_channel(frequency); 00354 00355 // Radio configuration 00356 _radio->set_rx_config(MODEM_LORA, params->bandwidth , phy_dr, 1, 0, 8, 00357 params->window_timeout , false, 0, false, 0, 0, true, 00358 params->is_rx_continuous ); 00359 00360 if (params->is_repeater_supported == true) { 00361 max_payload = max_payload_with_repeater_AU915 [dr]; 00362 } else { 00363 max_payload = max_payload_AU915 [dr]; 00364 } 00365 _radio->set_max_payload_length(MODEM_LORA, 00366 max_payload + LORA_MAC_FRMPAYLOAD_OVERHEAD); 00367 00368 _radio->unlock(); 00369 00370 *datarate = (uint8_t) dr; 00371 return true; 00372 } 00373 00374 bool LoRaPHYAU915::tx_config(tx_config_params_t* params, int8_t* tx_power, 00375 lorawan_time_t* tx_toa) 00376 { 00377 int8_t phy_dr = datarates_AU915 [params->datarate]; 00378 00379 if (params->tx_power > bands[channels[params->channel].band].max_tx_pwr) { 00380 params->tx_power = bands[channels[params->channel].band].max_tx_pwr; 00381 } 00382 00383 uint32_t bandwidth = get_bandwidth(params->datarate); 00384 int8_t phy_tx_power = 0; 00385 00386 // Calculate physical TX power 00387 phy_tx_power = compute_tx_power(params->tx_power, params->max_eirp, 00388 params->antenna_gain); 00389 00390 // setting up radio tx configurations 00391 00392 _radio->lock(); 00393 00394 _radio->set_channel(channels[params->channel].frequency); 00395 00396 _radio->set_tx_config(MODEM_LORA, phy_tx_power, 0, bandwidth, phy_dr, 1, 8, 00397 false, true, 0, 0, false, 3000); 00398 00399 // Setup maximum payload lenght of the radio driver 00400 _radio->set_max_payload_length(MODEM_LORA, params->pkt_len); 00401 00402 *tx_toa = _radio->time_on_air(MODEM_LORA, params->pkt_len); 00403 00404 _radio->unlock(); 00405 00406 *tx_power = params->tx_power; 00407 00408 return true; 00409 } 00410 00411 uint8_t LoRaPHYAU915::link_ADR_request(adr_req_params_t* params, 00412 int8_t* dr_out, int8_t* tx_power_out, 00413 uint8_t* nb_rep_out, 00414 uint8_t* nb_bytes_parsed) 00415 { 00416 uint8_t status = 0x07; 00417 link_adr_params_t adr_settings; 00418 uint8_t next_index = 0; 00419 uint8_t bytes_processed = 0; 00420 uint16_t temp_channel_masks[AU915_CHANNEL_MASK_SIZE] = { 0, 0, 0, 0, 0}; 00421 00422 verify_adr_params_t verify_params; 00423 00424 // Initialize local copy of channels mask 00425 copy_channel_mask(temp_channel_masks, channel_mask, AU915_CHANNEL_MASK_SIZE); 00426 00427 while (bytes_processed < params->payload_size) { 00428 next_index = parse_link_ADR_req(&(params->payload [bytes_processed]), 00429 &adr_settings); 00430 00431 if (next_index == 0) { 00432 break; // break loop, since no more request has been found 00433 } 00434 00435 // Update bytes processed 00436 bytes_processed += next_index; 00437 00438 // Revert status, as we only check the last ADR request for the channel mask KO 00439 status = 0x07; 00440 00441 if (adr_settings.ch_mask_ctrl == 6) { 00442 // Enable all 125 kHz channels 00443 temp_channel_masks[0] = 0xFFFF; 00444 temp_channel_masks[1] = 0xFFFF; 00445 temp_channel_masks[2] = 0xFFFF; 00446 temp_channel_masks[3] = 0xFFFF; 00447 // Apply chMask to channels 64 to 71 00448 temp_channel_masks[4] = adr_settings.channel_mask; 00449 } else if (adr_settings.ch_mask_ctrl == 7) { 00450 // Disable all 125 kHz channels 00451 temp_channel_masks[0] = 0x0000; 00452 temp_channel_masks[1] = 0x0000; 00453 temp_channel_masks[2] = 0x0000; 00454 temp_channel_masks[3] = 0x0000; 00455 // Apply chMask to channels 64 to 71 00456 temp_channel_masks[4] = adr_settings.channel_mask; 00457 } else if (adr_settings.ch_mask_ctrl == 5) { 00458 // RFU 00459 status &= 0xFE; // Channel mask KO 00460 } else { 00461 temp_channel_masks[adr_settings.ch_mask_ctrl] = adr_settings.channel_mask; 00462 } 00463 } 00464 00465 // FCC 15.247 paragraph F mandates to hop on at least 2 125 kHz channels 00466 if ((adr_settings.datarate < DR_6) 00467 && (num_active_channels(temp_channel_masks, 0, 4) < 2)) { 00468 status &= 0xFE; // Channel mask KO 00469 } 00470 00471 verify_params.status = status; 00472 verify_params.adr_enabled = params->adr_enabled ; 00473 verify_params.datarate = adr_settings.datarate; 00474 verify_params.tx_power = adr_settings.tx_power; 00475 verify_params.nb_rep = adr_settings.nb_rep; 00476 verify_params.current_datarate = params->current_datarate ; 00477 verify_params.current_tx_power = params->current_tx_power ; 00478 verify_params.current_nb_rep = params->current_nb_rep ; 00479 verify_params.channel_mask = temp_channel_masks; 00480 00481 00482 // Verify the parameters and update, if necessary 00483 status = verify_link_ADR_req(&verify_params, &adr_settings.datarate, 00484 &adr_settings.tx_power, &adr_settings.nb_rep); 00485 00486 // Update cchannel mask if everything is correct 00487 if (status == 0x07) { 00488 // Copy Mask 00489 copy_channel_mask(channel_mask, temp_channel_masks, AU915_CHANNEL_MASK_SIZE); 00490 00491 current_channel_mask[0] &= channel_mask[0]; 00492 current_channel_mask[1] &= channel_mask[1]; 00493 current_channel_mask[2] &= channel_mask[2]; 00494 current_channel_mask[3] &= channel_mask[3]; 00495 current_channel_mask[4] = channel_mask[4]; 00496 } 00497 00498 // Update status variables 00499 *dr_out = adr_settings.datarate; 00500 *tx_power_out = adr_settings.tx_power; 00501 *nb_rep_out = adr_settings.nb_rep; 00502 *nb_bytes_parsed = bytes_processed; 00503 00504 return status; 00505 } 00506 00507 uint8_t LoRaPHYAU915::accept_rx_param_setup_req(rx_param_setup_req_t* params) 00508 { 00509 uint8_t status = 0x07; 00510 uint32_t freq = params->frequency; 00511 00512 // Verify radio frequency 00513 _radio->lock(); 00514 00515 if ((_radio->check_rf_frequency(freq) == false) 00516 || (freq < AU915_FIRST_RX1_CHANNEL) 00517 || (freq > AU915_LAST_RX1_CHANNEL) 00518 || (((freq - (uint32_t) AU915_FIRST_RX1_CHANNEL) 00519 % (uint32_t) AU915_STEPWIDTH_RX1_CHANNEL) != 0)) { 00520 status &= 0xFE; // Channel frequency KO 00521 } 00522 00523 _radio->unlock(); 00524 00525 // Verify datarate 00526 if (val_in_range(params->datarate, AU915_RX_MIN_DATARATE, AU915_RX_MAX_DATARATE) == 0) { 00527 status &= 0xFD; // Datarate KO 00528 } 00529 00530 if ((params->datarate == DR_7) || (params->datarate > DR_13)) { 00531 status &= 0xFD; // Datarate KO 00532 } 00533 00534 // Verify datarate offset 00535 if (val_in_range(params->dr_offset, AU915_MIN_RX1_DR_OFFSET, AU915_MAX_RX1_DR_OFFSET) == 0) { 00536 status &= 0xFB; // Rx1DrOffset range KO 00537 } 00538 00539 return status; 00540 } 00541 00542 int8_t LoRaPHYAU915::get_alternate_DR(uint8_t nb_trials) 00543 { 00544 int8_t datarate = 0; 00545 00546 // Re-enable 500 kHz default channels 00547 channel_mask[4] = 0x00FF; 00548 00549 if ((nb_trials & 0x01) == 0x01) { 00550 datarate = DR_6; 00551 } else { 00552 datarate = DR_0; 00553 } 00554 00555 return datarate; 00556 } 00557 00558 bool LoRaPHYAU915::set_next_channel(channel_selection_params_t* next_chan_params, 00559 uint8_t* channel, lorawan_time_t* time, 00560 lorawan_time_t* aggregated_timeOff) 00561 { 00562 uint8_t nb_enabled_channels = 0; 00563 uint8_t delay_tx = 0; 00564 uint8_t enabled_channels[AU915_MAX_NB_CHANNELS] = { 0 }; 00565 lorawan_time_t next_tx_delay = 0; 00566 00567 // Count 125kHz channels 00568 if (num_active_channels(current_channel_mask, 0, 4) == 0) { 00569 // Reactivate 125 kHz default channels 00570 copy_channel_mask(current_channel_mask, channel_mask, 4); 00571 } 00572 00573 // Check other channels 00574 if (next_chan_params->current_datarate >= DR_6) { 00575 if ((current_channel_mask[4] & 0x00FF) == 0) { 00576 // fall back to 500 kHz default channels 00577 current_channel_mask[4] = channel_mask[4]; 00578 } 00579 } 00580 00581 if (next_chan_params->aggregate_timeoff <= _lora_time.get_elapsed_time(next_chan_params->last_aggregate_tx_time)) { 00582 // Reset Aggregated time off 00583 *aggregated_timeOff = 0; 00584 00585 // Update bands Time OFF 00586 next_tx_delay = update_band_timeoff(next_chan_params->joined, 00587 next_chan_params->dc_enabled, 00588 bands, AU915_MAX_NB_BANDS); 00589 00590 // Search how many channels are enabled 00591 nb_enabled_channels = enabled_channel_count(next_chan_params->joined, 00592 next_chan_params->current_datarate, 00593 current_channel_mask, 00594 enabled_channels, &delay_tx); 00595 } else { 00596 delay_tx++; 00597 next_tx_delay = next_chan_params->aggregate_timeoff - _lora_time.get_elapsed_time(next_chan_params->last_aggregate_tx_time); 00598 } 00599 00600 if (nb_enabled_channels > 0) { 00601 // We found a valid channel 00602 *channel = enabled_channels[get_random(0, nb_enabled_channels - 1)]; 00603 // Disable the channel in the mask 00604 disable_channel(current_channel_mask, *channel, 00605 AU915_MAX_NB_CHANNELS - 8); 00606 00607 *time = 0; 00608 return true; 00609 } else { 00610 if (delay_tx > 0) { 00611 // Delay transmission due to AggregatedTimeOff or to a band time off 00612 *time = next_tx_delay; 00613 return true; 00614 } 00615 // Datarate not supported by any channel 00616 *time = 0; 00617 return false; 00618 } 00619 } 00620 00621 uint8_t LoRaPHYAU915::apply_DR_offset(int8_t dr, int8_t dr_offset) 00622 { 00623 int8_t datarate = datarate_offsets_AU915 [dr][dr_offset]; 00624 00625 if (datarate < 0) { 00626 datarate = DR_0; 00627 } 00628 return datarate; 00629 }
Generated on Tue Jul 12 2022 12:21:58 by
1.7.2