ENEL400 / AlohaTransceiver

Basic MAC data interface for LoRa transceiver

Dependencies:   L2Frame crc

Dependents:   LoRaBaseStation LoRaTerminal

AlohaTransceiver.cpp@31:a0454fda1538, 2016-09-03 (annotated)

Committer:
rba90
Date:
Sat Sep 03 04:41:48 2016 +0000
Revision:
31:a0454fda1538
Parent:
30:bccad60351ac
Child:
32:b7d87c5f647c
integrate ACK into the system

Who changed what in which revision?

UserRevisionLine numberNew contents of line
rba90 0:e2ccabf3f30c 1 #include "AlohaTransceiver.h"
rba90 0:e2ccabf3f30c 2 #include "mbed.h"
rba90 0:e2ccabf3f30c 3 #include "radio.h"
rba90 18:3e6483550f25 4 #include "debug.h"
rba90 0:e2ccabf3f30c 5 #include "AlohaFrame.h"
rba90 15:0dc9df48687a 6 #include "RingBuffer.h"
rba90 0:e2ccabf3f30c 7
rba90 28:2c0e115b4f72 8 #define ALLOW_CALLBACK_DEBUG 0
rba90 18:3e6483550f25 9
rba90 28:2c0e115b4f72 10 #define SET_FLAG(t, x) (t) |= 1 << (x)
rba90 28:2c0e115b4f72 11 #define CLEAR_FLAG(t, x) (t) &= ~(1 << (x))
rba90 28:2c0e115b4f72 12 #define TOGGLE_FLAG(t, x) (t) ^= 1 << (x)
rba90 28:2c0e115b4f72 13 #define CHECK_FLAG(t, x) (t) >> (x) & 1
rba90 27:463688e3bd12 14
rba90 0:e2ccabf3f30c 15 // declear the type of radio state
rba90 0:e2ccabf3f30c 16 typedef enum
rba90 0:e2ccabf3f30c 17 {
rba90 0:e2ccabf3f30c 18 LOWPOWER = 0,
rba90 0:e2ccabf3f30c 19 IDLE,
rba90 0:e2ccabf3f30c 20
rba90 0:e2ccabf3f30c 21 RX,
rba90 0:e2ccabf3f30c 22 RX_TIMEOUT,
rba90 0:e2ccabf3f30c 23 RX_ERROR,
rba90 0:e2ccabf3f30c 24
rba90 0:e2ccabf3f30c 25 TX,
rba90 0:e2ccabf3f30c 26 TX_TIMEOUT,
rba90 0:e2ccabf3f30c 27
rba90 0:e2ccabf3f30c 28 CAD,
rba90 0:e2ccabf3f30c 29 CAD_DONE
rba90 0:e2ccabf3f30c 30 }AppStates_t;
rba90 0:e2ccabf3f30c 31
rba90 0:e2ccabf3f30c 32 // radio driver related variables
rba90 0:e2ccabf3f30c 33 static int16_t RssiValue;
rba90 0:e2ccabf3f30c 34 static int8_t SnrValue;
rba90 0:e2ccabf3f30c 35
rba90 0:e2ccabf3f30c 36 static volatile AppStates_t State;
rba90 0:e2ccabf3f30c 37 static RadioEvents_t RadioEvents;
rba90 0:e2ccabf3f30c 38
rba90 27:463688e3bd12 39 // rx queue
rba90 27:463688e3bd12 40 CircularBuffer<AlohaFrame *> AlohaRxQueue(10);
rba90 17:c6e2e2cd6e5f 41
rba90 0:e2ccabf3f30c 42 // callback functions for radio driver
rba90 0:e2ccabf3f30c 43 void OnTxDone();
rba90 0:e2ccabf3f30c 44 void OnRxDone( uint8_t *payload, uint16_t size, int16_t rssi, int8_t snr );
rba90 0:e2ccabf3f30c 45 void OnTxTimeout();
rba90 0:e2ccabf3f30c 46 void OnRxTimeout();
rba90 0:e2ccabf3f30c 47 void OnRxError();
rba90 0:e2ccabf3f30c 48 void OnFhssChangeChannel( uint8_t channelIndex );
rba90 0:e2ccabf3f30c 49 void OnCadDone();
rba90 0:e2ccabf3f30c 50
rba90 0:e2ccabf3f30c 51 // radio driver
rba90 20:bd26d3cbc0bd 52 #ifdef DRIVER_SX1276
rba90 0:e2ccabf3f30c 53 SX1276MB1xAS Radio( NULL );
rba90 0:e2ccabf3f30c 54 #endif
rba90 0:e2ccabf3f30c 55
rba90 20:bd26d3cbc0bd 56 #ifdef DRIVER_INAIR
rba90 0:e2ccabf3f30c 57 SX1276inAir Radio( NULL );
rba90 0:e2ccabf3f30c 58 #endif
rba90 0:e2ccabf3f30c 59
rba90 0:e2ccabf3f30c 60
rba90 0:e2ccabf3f30c 61 /*
rba90 0:e2ccabf3f30c 62 * Abstract interface for accessing radio driver
rba90 0:e2ccabf3f30c 63 */
rba90 0:e2ccabf3f30c 64
rba90 27:463688e3bd12 65 AlohaTransceiver::AlohaTransceiver(uint8_t id):
rba90 31:a0454fda1538 66 AlohaTxQueue(32)
rba90 0:e2ccabf3f30c 67 {
rba90 11:3e1ff29da71a 68 // store unique device id
rba90 11:3e1ff29da71a 69 deviceId = id;
rba90 11:3e1ff29da71a 70
rba90 17:c6e2e2cd6e5f 71 // initialize sequenceid
rba90 17:c6e2e2cd6e5f 72 memset(seqid, 0x0, sizeof(seqid));
rba90 17:c6e2e2cd6e5f 73
rba90 31:a0454fda1538 74 // clear tx done state
rba90 31:a0454fda1538 75 isTxDone = true;
rba90 31:a0454fda1538 76
rba90 31:a0454fda1538 77 // assume all station is clear to transmit
rba90 31:a0454fda1538 78 isAcked = 0xffff;
rba90 28:2c0e115b4f72 79
rba90 0:e2ccabf3f30c 80 // configure properties
rba90 0:e2ccabf3f30c 81 #if USE_MODEM_LORA == 1
rba90 0:e2ccabf3f30c 82 Settings.Power = TX_OUTPUT_POWER;
rba90 0:e2ccabf3f30c 83 Settings.Bandwidth = LORA_BANDWIDTH;
rba90 0:e2ccabf3f30c 84 Settings.Datarate = LORA_SPREADING_FACTOR;
rba90 0:e2ccabf3f30c 85 Settings.Coderate = LORA_CODINGRATE;
rba90 0:e2ccabf3f30c 86 Settings.PreambleLen = LORA_PREAMBLE_LENGTH;
rba90 0:e2ccabf3f30c 87 Settings.SymbolTimeout = LORA_SYMBOL_TIMEOUT;
rba90 0:e2ccabf3f30c 88 Settings.FixLen = LORA_FIX_LENGTH_PAYLOAD_ON;
rba90 0:e2ccabf3f30c 89 Settings.PayloadLen = 0;
rba90 0:e2ccabf3f30c 90 Settings.CrcOn = LORA_CRC_ENABLED;
rba90 0:e2ccabf3f30c 91 Settings.FreqHopOn = LORA_FHSS_ENABLED;
rba90 0:e2ccabf3f30c 92 Settings.HopPeriod = LORA_NB_SYMB_HOP;
rba90 0:e2ccabf3f30c 93 Settings.IqInverted = LORA_IQ_INVERSION_ON;
rba90 0:e2ccabf3f30c 94 Settings.RxContinuous = true;
rba90 0:e2ccabf3f30c 95 Settings.TxTimeout = TX_TIMEOUT_VALUE;
rba90 0:e2ccabf3f30c 96
rba90 0:e2ccabf3f30c 97 #elif USE_MODEM_FSK == 1
rba90 0:e2ccabf3f30c 98 // TODO: Complete settings for FSK mode
rba90 0:e2ccabf3f30c 99 #error "FSK not implemented"
rba90 0:e2ccabf3f30c 100 #else
rba90 0:e2ccabf3f30c 101 #error "Please define a modem in the compiler options."
rba90 0:e2ccabf3f30c 102 #endif
rba90 0:e2ccabf3f30c 103 }
rba90 0:e2ccabf3f30c 104
rba90 0:e2ccabf3f30c 105 AlohaTransceiver::~AlohaTransceiver()
rba90 0:e2ccabf3f30c 106 {
rba90 0:e2ccabf3f30c 107
rba90 0:e2ccabf3f30c 108 }
rba90 0:e2ccabf3f30c 109
rba90 6:f545f5aa7de3 110 void AlohaTransceiver::boardInit()
rba90 0:e2ccabf3f30c 111 {
rba90 0:e2ccabf3f30c 112 // configure callback functions
rba90 0:e2ccabf3f30c 113 RadioEvents.TxDone = OnTxDone;
rba90 0:e2ccabf3f30c 114 RadioEvents.RxDone = OnRxDone;
rba90 0:e2ccabf3f30c 115 RadioEvents.RxError = OnRxError;
rba90 0:e2ccabf3f30c 116 RadioEvents.TxTimeout = OnTxTimeout;
rba90 0:e2ccabf3f30c 117 RadioEvents.RxTimeout = OnRxTimeout;
rba90 0:e2ccabf3f30c 118 Radio.Init( &RadioEvents );
rba90 0:e2ccabf3f30c 119
rba90 0:e2ccabf3f30c 120 // verify the connection with the board
rba90 0:e2ccabf3f30c 121 while( Radio.Read( REG_VERSION ) == 0x00 )
rba90 0:e2ccabf3f30c 122 {
rba90 18:3e6483550f25 123 #ifdef DEBUG_ALOHA
rba90 18:3e6483550f25 124 debug( "Radio could not be detected!\n\r" );
rba90 18:3e6483550f25 125 #endif
rba90 0:e2ccabf3f30c 126 wait( 1 );
rba90 0:e2ccabf3f30c 127 }
rba90 18:3e6483550f25 128 #ifdef DEBUG_ALOHA
rba90 0:e2ccabf3f30c 129 printf("RadioRegVersion: %d\r\n", Radio.Read( REG_VERSION ));
rba90 18:3e6483550f25 130 #endif
rba90 0:e2ccabf3f30c 131 }
rba90 0:e2ccabf3f30c 132
rba90 0:e2ccabf3f30c 133 void AlohaTransceiver::updateSettings()
rba90 0:e2ccabf3f30c 134 {
rba90 6:f545f5aa7de3 135 Radio.SetChannel( RF_FREQUENCY );
rba90 0:e2ccabf3f30c 136 #if USE_MODEM_LORA == 1
rba90 0:e2ccabf3f30c 137
rba90 0:e2ccabf3f30c 138 Radio.SetTxConfig( MODEM_LORA, Settings.Power, 0, Settings.Bandwidth,
rba90 0:e2ccabf3f30c 139 Settings.Datarate, Settings.Coderate,
rba90 0:e2ccabf3f30c 140 Settings.PreambleLen, Settings.FixLen,
rba90 0:e2ccabf3f30c 141 Settings.CrcOn, Settings.FreqHopOn, Settings.HopPeriod,
rba90 0:e2ccabf3f30c 142 Settings.IqInverted, Settings.TxTimeout );
rba90 0:e2ccabf3f30c 143
rba90 0:e2ccabf3f30c 144 Radio.SetRxConfig( MODEM_LORA, Settings.Bandwidth, Settings.Datarate,
rba90 0:e2ccabf3f30c 145 Settings.Coderate, 0, Settings.PreambleLen,
rba90 0:e2ccabf3f30c 146 Settings.SymbolTimeout, Settings.FixLen, Settings.PayloadLen,
rba90 0:e2ccabf3f30c 147 Settings.CrcOn, Settings.FreqHopOn, Settings.HopPeriod,
rba90 0:e2ccabf3f30c 148 Settings.IqInverted, Settings.RxContinuous );
rba90 0:e2ccabf3f30c 149
rba90 0:e2ccabf3f30c 150 #elif USE_MODEM_FSK == 1
rba90 0:e2ccabf3f30c 151 #error "FSK not implemented"
rba90 0:e2ccabf3f30c 152 #else
rba90 0:e2ccabf3f30c 153 #error "Please define a modem in the compiler options."
rba90 0:e2ccabf3f30c 154 #endif
rba90 0:e2ccabf3f30c 155 }
rba90 0:e2ccabf3f30c 156
rba90 6:f545f5aa7de3 157 void AlohaTransceiver::enable()
rba90 6:f545f5aa7de3 158 {
rba90 6:f545f5aa7de3 159 // entering passive receiver mode
rba90 10:065a4b58c6ff 160 Radio.Rx( 0 );
rba90 6:f545f5aa7de3 161 }
rba90 6:f545f5aa7de3 162
rba90 0:e2ccabf3f30c 163 void AlohaTransceiver::poll()
rba90 0:e2ccabf3f30c 164 {
rba90 0:e2ccabf3f30c 165 switch( State )
rba90 0:e2ccabf3f30c 166 {
rba90 0:e2ccabf3f30c 167 case RX:
rba90 5:c3741633dc6f 168 {
rba90 27:463688e3bd12 169 // process packet if received
rba90 30:bccad60351ac 170 // it is noticed that the rx handler does not queue the received packet
rba90 30:bccad60351ac 171 // due to the hardware limitation
rba90 27:463688e3bd12 172 while (AlohaRxQueue.getCounter() > 0)
rba90 25:bcd1cee4e5a8 173 {
rba90 27:463688e3bd12 174 // pop from queue
rba90 27:463688e3bd12 175 AlohaFrame *frame = AlohaRxQueue.dequeue();
rba90 27:463688e3bd12 176
rba90 27:463688e3bd12 177 // check destination
rba90 27:463688e3bd12 178 // if the destination is the device id, then processing, otherwise drop the packet and continue
rba90 27:463688e3bd12 179 // listening
rba90 27:463688e3bd12 180 if (frame->getDestinationAddress() == (deviceId & 0x0f))
rba90 26:e87c8d345644 181 {
rba90 27:463688e3bd12 182 uint8_t type = frame->getType();
rba90 27:463688e3bd12 183
rba90 27:463688e3bd12 184 // schedule the ack frame immediatly after the data frame is received
rba90 27:463688e3bd12 185 if (type == AlohaFrame::Aloha_Data)
rba90 29:6c59b0bba861 186 {
rba90 29:6c59b0bba861 187 #ifdef DEBUG_ALOHA
rba90 29:6c59b0bba861 188 printf("\r\nRXDATA::SRC_ADDR:0x%x,SEQID:0x%x\r\n", frame->getSourceAddress(), frame->getSequenceID());
rba90 29:6c59b0bba861 189 #endif
rba90 27:463688e3bd12 190 sendAck(frame);
rba90 27:463688e3bd12 191 }
rba90 27:463688e3bd12 192 else if (type == AlohaFrame::Aloha_ACK)
rba90 27:463688e3bd12 193 {
rba90 26:e87c8d345644 194 #ifdef DEBUG_ALOHA
rba90 29:6c59b0bba861 195 printf("\r\nRXACK::SRC_ADDR:0x%x,SEQID:0x%x\r\n", frame->getSourceAddress(), frame->getSequenceID());
rba90 26:e87c8d345644 196 #endif
rba90 31:a0454fda1538 197 // clear the ack state
rba90 31:a0454fda1538 198 uint8_t src_addr = frame->getSourceAddress();
rba90 31:a0454fda1538 199 uint8_t foreign_seqid = frame->getSequenceID();
rba90 31:a0454fda1538 200
rba90 31:a0454fda1538 201 // compare the local sequence id and foreign sequence id for specific host
rba90 31:a0454fda1538 202 // if same then set the flag
rba90 31:a0454fda1538 203 if (seqid[src_addr] == foreign_seqid)
rba90 31:a0454fda1538 204 {
rba90 31:a0454fda1538 205 setAckedFlag(src_addr);
rba90 31:a0454fda1538 206 }
rba90 31:a0454fda1538 207 printf("frame_seqid: %d, local_seqid: %d\r\n", frame->getSequenceID(), seqid[frame->getSourceAddress()]);
rba90 31:a0454fda1538 208
rba90 27:463688e3bd12 209 }
rba90 27:463688e3bd12 210
rba90 27:463688e3bd12 211 // check registered callback function
rba90 27:463688e3bd12 212 // execute callback functions if registered
rba90 27:463688e3bd12 213 if (AlohaTypeCallbackTable[type] != NULL)
rba90 27:463688e3bd12 214 {
rba90 27:463688e3bd12 215 uint8_t payload_length = frame->getPayloadLength();
rba90 27:463688e3bd12 216 uint8_t payload[payload_length];
rba90 27:463688e3bd12 217 uint8_t src_addr = frame->getSourceAddress();
rba90 27:463688e3bd12 218
rba90 27:463688e3bd12 219 // extract payload
rba90 27:463688e3bd12 220 for (uint8_t i = 0; i < payload_length; i++)
rba90 27:463688e3bd12 221 {
rba90 27:463688e3bd12 222 payload[i] = frame->getPayload(i);
rba90 27:463688e3bd12 223 }
rba90 27:463688e3bd12 224
rba90 27:463688e3bd12 225 // execute callback function
rba90 27:463688e3bd12 226 AlohaTypeCallbackTable[type](payload, payload_length, src_addr);
rba90 27:463688e3bd12 227 }
rba90 26:e87c8d345644 228 }
rba90 17:c6e2e2cd6e5f 229
rba90 27:463688e3bd12 230 // free memory
rba90 27:463688e3bd12 231 delete frame;
rba90 0:e2ccabf3f30c 232 }
rba90 0:e2ccabf3f30c 233
rba90 10:065a4b58c6ff 234 Radio.Rx( 0 );
rba90 0:e2ccabf3f30c 235 State = LOWPOWER;
rba90 0:e2ccabf3f30c 236 break;
rba90 0:e2ccabf3f30c 237 }
rba90 0:e2ccabf3f30c 238 case TX:
rba90 0:e2ccabf3f30c 239 {
rba90 28:2c0e115b4f72 240 // set tx to done, allow next transmission
rba90 28:2c0e115b4f72 241 setTxDoneFlag();
rba90 28:2c0e115b4f72 242
rba90 10:065a4b58c6ff 243 Radio.Rx( 0 );
rba90 0:e2ccabf3f30c 244 State = LOWPOWER;
rba90 0:e2ccabf3f30c 245 break;
rba90 0:e2ccabf3f30c 246 }
rba90 0:e2ccabf3f30c 247 case RX_TIMEOUT:
rba90 0:e2ccabf3f30c 248 {
rba90 10:065a4b58c6ff 249 Radio.Rx( 0 );
rba90 0:e2ccabf3f30c 250 State = LOWPOWER;
rba90 0:e2ccabf3f30c 251 break;
rba90 0:e2ccabf3f30c 252 }
rba90 0:e2ccabf3f30c 253 case RX_ERROR:
rba90 0:e2ccabf3f30c 254 {
rba90 10:065a4b58c6ff 255 Radio.Rx( 0 );
rba90 0:e2ccabf3f30c 256 State = LOWPOWER;
rba90 0:e2ccabf3f30c 257 break;
rba90 0:e2ccabf3f30c 258 }
rba90 0:e2ccabf3f30c 259 case TX_TIMEOUT:
rba90 0:e2ccabf3f30c 260 {
rba90 29:6c59b0bba861 261 // set tx to done, allow next transmission
rba90 29:6c59b0bba861 262 setTxDoneFlag();
rba90 29:6c59b0bba861 263
rba90 10:065a4b58c6ff 264 Radio.Rx( 0 );
rba90 0:e2ccabf3f30c 265 State = LOWPOWER;
rba90 0:e2ccabf3f30c 266 break;
rba90 0:e2ccabf3f30c 267 }
rba90 0:e2ccabf3f30c 268 case LOWPOWER:
rba90 0:e2ccabf3f30c 269 {
rba90 22:2e39f382f782 270 // transmit packet when the radio is free
rba90 31:a0454fda1538 271 if (getTxDoneFlag())
rba90 22:2e39f382f782 272 {
rba90 31:a0454fda1538 273 // find next available packet to transmit
rba90 31:a0454fda1538 274 for (size_t i = 0; i < AlohaTxQueue.getCounter(); i++)
rba90 31:a0454fda1538 275 {
rba90 31:a0454fda1538 276 AlohaFrame *frame = AlohaTxQueue.dequeue();
rba90 31:a0454fda1538 277 uint8_t type = frame->getType();
rba90 31:a0454fda1538 278
rba90 31:a0454fda1538 279 // determined by the type of the frame, only data frame need to be cleared before transmitting
rba90 31:a0454fda1538 280 switch (type)
rba90 31:a0454fda1538 281 {
rba90 31:a0454fda1538 282 // ack frame can transmit directly
rba90 31:a0454fda1538 283 case AlohaFrame::Aloha_ACK:
rba90 31:a0454fda1538 284 {
rba90 31:a0454fda1538 285 sendFrame(frame);
rba90 31:a0454fda1538 286 break;
rba90 31:a0454fda1538 287 }
rba90 31:a0454fda1538 288 case AlohaFrame::Aloha_Data:
rba90 31:a0454fda1538 289 {
rba90 31:a0454fda1538 290 uint8_t dest_addr = frame->getDestinationAddress();
rba90 31:a0454fda1538 291
rba90 31:a0454fda1538 292 // depending on the availability of the destination host,
rba90 31:a0454fda1538 293 // the radio will on transmit the packet when acked
rba90 31:a0454fda1538 294 if (getAckedFlag(dest_addr))
rba90 31:a0454fda1538 295 {
rba90 31:a0454fda1538 296 sendFrame(frame);
rba90 31:a0454fda1538 297
rba90 31:a0454fda1538 298 // block the next transmission until previous transmission is done
rba90 31:a0454fda1538 299 clearTxDoneFlag();
rba90 31:a0454fda1538 300
rba90 31:a0454fda1538 301 // block the next transmission of the same host until an acked packet
rba90 31:a0454fda1538 302 // is received
rba90 31:a0454fda1538 303 clearAckedFlag(dest_addr);
rba90 31:a0454fda1538 304
rba90 31:a0454fda1538 305 // free memory
rba90 31:a0454fda1538 306 delete frame;
rba90 31:a0454fda1538 307 }
rba90 31:a0454fda1538 308
rba90 31:a0454fda1538 309 // otherwise put the packet back to the end of queue and wait for its being acked
rba90 31:a0454fda1538 310 else
rba90 31:a0454fda1538 311 {
rba90 31:a0454fda1538 312 AlohaTxQueue.enqueue(frame);
rba90 31:a0454fda1538 313 }
rba90 31:a0454fda1538 314 break;
rba90 31:a0454fda1538 315 }
rba90 31:a0454fda1538 316
rba90 31:a0454fda1538 317 default:
rba90 31:a0454fda1538 318 break;
rba90 31:a0454fda1538 319 }
rba90 31:a0454fda1538 320 }
rba90 22:2e39f382f782 321 }
rba90 0:e2ccabf3f30c 322 break;
rba90 0:e2ccabf3f30c 323 }
rba90 0:e2ccabf3f30c 324 default:
rba90 0:e2ccabf3f30c 325 {
rba90 0:e2ccabf3f30c 326 State = LOWPOWER;
rba90 0:e2ccabf3f30c 327 break;
rba90 0:e2ccabf3f30c 328 }
rba90 0:e2ccabf3f30c 329 }
rba90 0:e2ccabf3f30c 330 }
rba90 0:e2ccabf3f30c 331
rba90 31:a0454fda1538 332 void AlohaTransceiver::sendFrame(AlohaFrame *frame)
rba90 31:a0454fda1538 333 {
rba90 31:a0454fda1538 334 // create a buffer for transmit
rba90 31:a0454fda1538 335 uint8_t frame_length = frame->getPayloadLength() + FIXED_BYTE;
rba90 31:a0454fda1538 336 uint8_t buffer[frame_length]; // 4 fix fields
rba90 31:a0454fda1538 337 memset(buffer, 0x0, sizeof(buffer));
rba90 31:a0454fda1538 338
rba90 31:a0454fda1538 339 // copy content to buffer
rba90 31:a0454fda1538 340 frame->serialize(buffer);
rba90 31:a0454fda1538 341
rba90 31:a0454fda1538 342 // send to radio
rba90 31:a0454fda1538 343 Radio.Send(buffer, frame_length);
rba90 31:a0454fda1538 344 }
rba90 31:a0454fda1538 345
rba90 24:8f31c33c7675 346 bool AlohaTransceiver::send(BasicPacket *packet)
rba90 24:8f31c33c7675 347 {
rba90 24:8f31c33c7675 348 // for the reason that we only transmit basic packet format, the
rba90 24:8f31c33c7675 349 // length is always 8
rba90 24:8f31c33c7675 350 uint8_t payload_length = 8;
rba90 24:8f31c33c7675 351
rba90 24:8f31c33c7675 352 // get destination address
rba90 24:8f31c33c7675 353 uint8_t destination_address = findNextHop(packet->getDestinationID());
rba90 24:8f31c33c7675 354
rba90 24:8f31c33c7675 355 // serialize the packet from upper layer
rba90 24:8f31c33c7675 356 uint8_t buffer[payload_length];
rba90 24:8f31c33c7675 357 memset(buffer, 0x0, sizeof(buffer));
rba90 24:8f31c33c7675 358
rba90 24:8f31c33c7675 359 // copy bytes into buffer
rba90 24:8f31c33c7675 360 packet->serialize(buffer);
rba90 17:c6e2e2cd6e5f 361
rba90 17:c6e2e2cd6e5f 362 // create a new frame
rba90 22:2e39f382f782 363 AlohaFrame *frame = new AlohaFrame();
rba90 17:c6e2e2cd6e5f 364
rba90 22:2e39f382f782 365 // set properfies
rba90 24:8f31c33c7675 366 // set payload as data
rba90 22:2e39f382f782 367 frame->setType(AlohaFrame::Aloha_Data);
rba90 24:8f31c33c7675 368
rba90 24:8f31c33c7675 369 // set payload length (8 bytes for BasicPacket)
rba90 22:2e39f382f782 370 frame->setPayloadLength(payload_length);
rba90 24:8f31c33c7675 371
rba90 24:8f31c33c7675 372 // set mac layer device id
rba90 22:2e39f382f782 373 frame->setSourceAddress(deviceId);
rba90 24:8f31c33c7675 374
rba90 24:8f31c33c7675 375 // set mac layer destination id
rba90 24:8f31c33c7675 376 // for multiple hop system, the destination is the next hop
rba90 24:8f31c33c7675 377 // in this case, we use destination id from upper layer
rba90 24:8f31c33c7675 378 frame->setDestinationAddress(packet->getDestinationID());
rba90 24:8f31c33c7675 379
rba90 24:8f31c33c7675 380 // set full message flag (always true in this case)
rba90 22:2e39f382f782 381 frame->setFullMessageFlag(0x1);
rba90 22:2e39f382f782 382
rba90 24:8f31c33c7675 383 // use dest_addr as key for accessing sequence id
rba90 24:8f31c33c7675 384 // the seqid should increase as it successfully transmit the packet
rba90 24:8f31c33c7675 385 frame->setSequenceID(seqid[destination_address]++);
rba90 24:8f31c33c7675 386
rba90 22:2e39f382f782 387 // set payload
rba90 17:c6e2e2cd6e5f 388 for (uint8_t i = 0; i < payload_length; i++)
rba90 17:c6e2e2cd6e5f 389 {
rba90 24:8f31c33c7675 390 frame->setPayload(i, buffer[i]);
rba90 17:c6e2e2cd6e5f 391 }
rba90 17:c6e2e2cd6e5f 392
rba90 17:c6e2e2cd6e5f 393 // calculate crc
rba90 22:2e39f382f782 394 frame->generateCrc();
rba90 17:c6e2e2cd6e5f 395
rba90 22:2e39f382f782 396 // push frame to the back of queue
rba90 22:2e39f382f782 397 AlohaTxQueue.enqueue(frame);
rba90 27:463688e3bd12 398
rba90 27:463688e3bd12 399 // debug
rba90 27:463688e3bd12 400 #ifdef DEBUG_ALOHA
rba90 29:6c59b0bba861 401 printf("\r\nTXDATA::DEST_ADDR:0x%x,SEQID:0x%x\r\n", frame->getDestinationAddress(), frame->getSequenceID());
rba90 27:463688e3bd12 402 #endif
rba90 17:c6e2e2cd6e5f 403 return true;
rba90 0:e2ccabf3f30c 404 }
rba90 0:e2ccabf3f30c 405
rba90 25:bcd1cee4e5a8 406 void AlohaTransceiver::sendAck(AlohaFrame *inFrame)
rba90 25:bcd1cee4e5a8 407 {
rba90 25:bcd1cee4e5a8 408 // create a new frame by calling it's constructor
rba90 25:bcd1cee4e5a8 409 AlohaFrame *outFrame = new AlohaFrame();
rba90 25:bcd1cee4e5a8 410
rba90 25:bcd1cee4e5a8 411 // set frame type
rba90 25:bcd1cee4e5a8 412 outFrame->setType(AlohaFrame::Aloha_ACK);
rba90 25:bcd1cee4e5a8 413
rba90 25:bcd1cee4e5a8 414 // set payload length (0 byte payload for ack frame)
rba90 25:bcd1cee4e5a8 415 outFrame->setPayloadLength(0);
rba90 25:bcd1cee4e5a8 416
rba90 25:bcd1cee4e5a8 417 // set mac layer device id
rba90 25:bcd1cee4e5a8 418 outFrame->setSourceAddress(deviceId);
rba90 25:bcd1cee4e5a8 419
rba90 25:bcd1cee4e5a8 420 // set mac layer destination id
rba90 25:bcd1cee4e5a8 421 outFrame->setDestinationAddress(inFrame->getSourceAddress());
rba90 25:bcd1cee4e5a8 422
rba90 25:bcd1cee4e5a8 423 // set full message flag
rba90 25:bcd1cee4e5a8 424 outFrame->setFullMessageFlag(0x1);
rba90 25:bcd1cee4e5a8 425
rba90 25:bcd1cee4e5a8 426 // set seqid
rba90 25:bcd1cee4e5a8 427 // the sequence id is always the source id + 1
rba90 25:bcd1cee4e5a8 428 outFrame->setSequenceID(inFrame->getSequenceID() + 1);
rba90 25:bcd1cee4e5a8 429
rba90 25:bcd1cee4e5a8 430 // no payload
rba90 25:bcd1cee4e5a8 431
rba90 25:bcd1cee4e5a8 432 // generate cec
rba90 25:bcd1cee4e5a8 433 outFrame->generateCrc();
rba90 25:bcd1cee4e5a8 434
rba90 25:bcd1cee4e5a8 435 // push frame to the back of queue
rba90 25:bcd1cee4e5a8 436 AlohaTxQueue.enqueue(outFrame);
rba90 25:bcd1cee4e5a8 437
rba90 25:bcd1cee4e5a8 438 // debug
rba90 25:bcd1cee4e5a8 439 #ifdef DEBUG_ALOHA
rba90 29:6c59b0bba861 440 printf("\r\nTXACK::DEST_ADDR:0x%x,SEQID:0x%x\r\n", outFrame->getDestinationAddress(), outFrame->getSequenceID());
rba90 25:bcd1cee4e5a8 441 #endif
rba90 25:bcd1cee4e5a8 442 }
rba90 25:bcd1cee4e5a8 443
rba90 28:2c0e115b4f72 444 bool AlohaTransceiver::getTxDoneFlag()
rba90 28:2c0e115b4f72 445 {
rba90 31:a0454fda1538 446 return isTxDone;
rba90 28:2c0e115b4f72 447 }
rba90 28:2c0e115b4f72 448
rba90 28:2c0e115b4f72 449 void AlohaTransceiver::setTxDoneFlag()
rba90 28:2c0e115b4f72 450 {
rba90 31:a0454fda1538 451 isTxDone = true;
rba90 28:2c0e115b4f72 452 }
rba90 28:2c0e115b4f72 453
rba90 28:2c0e115b4f72 454 void AlohaTransceiver::clearTxDoneFlag()
rba90 28:2c0e115b4f72 455 {
rba90 31:a0454fda1538 456 isTxDone = false;
rba90 31:a0454fda1538 457 }
rba90 31:a0454fda1538 458
rba90 31:a0454fda1538 459 bool AlohaTransceiver::getAckedFlag(uint8_t addr)
rba90 31:a0454fda1538 460 {
rba90 31:a0454fda1538 461 return CHECK_FLAG(isAcked, addr);
rba90 31:a0454fda1538 462 }
rba90 31:a0454fda1538 463
rba90 31:a0454fda1538 464 void AlohaTransceiver::setAckedFlag(uint8_t addr)
rba90 31:a0454fda1538 465 {
rba90 31:a0454fda1538 466 SET_FLAG(isAcked, addr);
rba90 31:a0454fda1538 467 }
rba90 31:a0454fda1538 468
rba90 31:a0454fda1538 469 void AlohaTransceiver::clearAckedFlag(uint8_t addr)
rba90 31:a0454fda1538 470 {
rba90 31:a0454fda1538 471 CLEAR_FLAG(isAcked, addr);
rba90 28:2c0e115b4f72 472 }
rba90 28:2c0e115b4f72 473
rba90 0:e2ccabf3f30c 474 void AlohaTransceiver::registerType(AlohaFrame::AlohaType_t type, aloha_callback_func f)
rba90 0:e2ccabf3f30c 475 {
rba90 0:e2ccabf3f30c 476 AlohaTypeCallbackTable[type] = f;
rba90 0:e2ccabf3f30c 477 }
rba90 0:e2ccabf3f30c 478
rba90 0:e2ccabf3f30c 479 void AlohaTransceiver::deRegisterType(AlohaFrame::AlohaType_t type, aloha_callback_func f)
rba90 0:e2ccabf3f30c 480 {
rba90 0:e2ccabf3f30c 481 AlohaTypeCallbackTable[type] = NULL;
rba90 0:e2ccabf3f30c 482 }
rba90 0:e2ccabf3f30c 483
rba90 2:fa264e48d5f7 484 int16_t AlohaTransceiver::getRssi()
rba90 2:fa264e48d5f7 485 {
rba90 2:fa264e48d5f7 486 return RssiValue;
rba90 2:fa264e48d5f7 487 }
rba90 2:fa264e48d5f7 488
rba90 2:fa264e48d5f7 489 int8_t AlohaTransceiver::getSnr()
rba90 2:fa264e48d5f7 490 {
rba90 2:fa264e48d5f7 491 return SnrValue;
rba90 2:fa264e48d5f7 492 }
rba90 2:fa264e48d5f7 493
rba90 17:c6e2e2cd6e5f 494 uint8_t AlohaTransceiver::getDeviceID()
rba90 11:3e1ff29da71a 495 {
rba90 11:3e1ff29da71a 496 return deviceId;
rba90 11:3e1ff29da71a 497 }
rba90 11:3e1ff29da71a 498
rba90 17:c6e2e2cd6e5f 499 void AlohaTransceiver::setDeviceID(uint8_t id)
rba90 11:3e1ff29da71a 500 {
rba90 11:3e1ff29da71a 501 deviceId = id;
rba90 11:3e1ff29da71a 502 }
rba90 11:3e1ff29da71a 503
rba90 24:8f31c33c7675 504 uint8_t AlohaTransceiver::findNextHop(uint8_t addr)
rba90 24:8f31c33c7675 505 {
rba90 24:8f31c33c7675 506 // TODO: maintain a routing lookup table for choosing shortest path
rba90 24:8f31c33c7675 507 return addr;
rba90 24:8f31c33c7675 508 }
rba90 24:8f31c33c7675 509
rba90 8:4bda842f73d4 510 #if USE_MODEM_LORA == 1
rba90 8:4bda842f73d4 511 AlohaTransceiver::LoRaSettings_t *AlohaTransceiver::getSettings()
rba90 8:4bda842f73d4 512 {
rba90 8:4bda842f73d4 513 return &Settings;
rba90 8:4bda842f73d4 514 }
rba90 8:4bda842f73d4 515
rba90 8:4bda842f73d4 516 #elif USE_MODEM_FSK == 1
rba90 8:4bda842f73d4 517 AlohaTransceiver::FskSettings_t *AlohaTransceiver::getSettings()
rba90 8:4bda842f73d4 518 {
rba90 8:4bda842f73d4 519 return &Settings;
rba90 8:4bda842f73d4 520 }
rba90 8:4bda842f73d4 521 #else
rba90 8:4bda842f73d4 522 #error "Please define a modem in the compiler options."
rba90 8:4bda842f73d4 523 #endif
rba90 8:4bda842f73d4 524
rba90 0:e2ccabf3f30c 525 void OnTxDone( void )
rba90 0:e2ccabf3f30c 526 {
rba90 0:e2ccabf3f30c 527 Radio.Sleep( );
rba90 0:e2ccabf3f30c 528 State = TX;
rba90 18:3e6483550f25 529
rba90 18:3e6483550f25 530 #ifdef DEBUG_ALOHA
rba90 28:2c0e115b4f72 531 debug_if(ALLOW_CALLBACK_DEBUG, "> OnTxDone\n\r" );
rba90 18:3e6483550f25 532 #endif
rba90 0:e2ccabf3f30c 533 }
rba90 0:e2ccabf3f30c 534
rba90 0:e2ccabf3f30c 535 void OnRxDone( uint8_t *payload, uint16_t size, int16_t rssi, int8_t snr)
rba90 0:e2ccabf3f30c 536 {
rba90 27:463688e3bd12 537 uint8_t payload_length;
rba90 27:463688e3bd12 538
rba90 0:e2ccabf3f30c 539 Radio.Sleep( );
rba90 0:e2ccabf3f30c 540
rba90 0:e2ccabf3f30c 541 // safeguard: if size exceeded maximum buffer size, it will cause memory overflow
rba90 27:463688e3bd12 542 payload_length = size ? BUFFER_SIZE : size <= BUFFER_SIZE;
rba90 27:463688e3bd12 543
rba90 27:463688e3bd12 544 // create a new frame instance
rba90 27:463688e3bd12 545 AlohaFrame *frame = new AlohaFrame(payload, payload_length);
rba90 27:463688e3bd12 546
rba90 27:463688e3bd12 547 // push onto the end of queue
rba90 27:463688e3bd12 548 AlohaRxQueue.enqueue(frame);
rba90 0:e2ccabf3f30c 549
rba90 0:e2ccabf3f30c 550 RssiValue = rssi;
rba90 0:e2ccabf3f30c 551 SnrValue = snr;
rba90 0:e2ccabf3f30c 552 State = RX;
rba90 18:3e6483550f25 553
rba90 18:3e6483550f25 554 #ifdef DEBUG_ALOHA
rba90 28:2c0e115b4f72 555 debug_if(ALLOW_CALLBACK_DEBUG, "> OnRxDone\n\r" );
rba90 18:3e6483550f25 556 #endif
rba90 0:e2ccabf3f30c 557 }
rba90 0:e2ccabf3f30c 558
rba90 0:e2ccabf3f30c 559 void OnTxTimeout( void )
rba90 0:e2ccabf3f30c 560 {
rba90 0:e2ccabf3f30c 561 Radio.Sleep( );
rba90 0:e2ccabf3f30c 562 State = TX_TIMEOUT;
rba90 18:3e6483550f25 563
rba90 18:3e6483550f25 564 #ifdef DEBUG_ALOHA
rba90 28:2c0e115b4f72 565 debug_if(ALLOW_CALLBACK_DEBUG, "> OnTxTimeout\n\r" );
rba90 18:3e6483550f25 566 #endif
rba90 0:e2ccabf3f30c 567 }
rba90 0:e2ccabf3f30c 568
rba90 0:e2ccabf3f30c 569 void OnRxTimeout( void )
rba90 0:e2ccabf3f30c 570 {
rba90 0:e2ccabf3f30c 571 Radio.Sleep( );
rba90 0:e2ccabf3f30c 572 State = RX_TIMEOUT;
rba90 18:3e6483550f25 573
rba90 18:3e6483550f25 574 #ifdef DEBUG_ALOHA
rba90 28:2c0e115b4f72 575 debug_if(ALLOW_CALLBACK_DEBUG, "> OnRxTimeout\n\r" );
rba90 18:3e6483550f25 576 #endif
rba90 0:e2ccabf3f30c 577 }
rba90 0:e2ccabf3f30c 578
rba90 0:e2ccabf3f30c 579 void OnRxError( void )
rba90 0:e2ccabf3f30c 580 {
rba90 0:e2ccabf3f30c 581 Radio.Sleep( );
rba90 0:e2ccabf3f30c 582 State = RX_ERROR;
rba90 18:3e6483550f25 583
rba90 18:3e6483550f25 584 #ifdef DEBUG_ALOHA
rba90 28:2c0e115b4f72 585 debug_if(ALLOW_CALLBACK_DEBUG, "> OnRxError\n\r" );
rba90 18:3e6483550f25 586 #endif
rba90 0:e2ccabf3f30c 587 }
rba90 24:8f31c33c7675 588