ENEL400 / AlohaTransceiver

Basic MAC data interface for LoRa transceiver

Dependencies:   L2Frame crc

Dependents:   LoRaBaseStation LoRaTerminal

AlohaTransceiver.cpp@33:810074d10fcf, 2016-09-03 (annotated)

Committer:
rba90
Date:
Sat Sep 03 05:01:19 2016 +0000
Revision:
33:810074d10fcf
Parent:
32:b7d87c5f647c
Child:
34:14b1472a79e4
fix a bug where TxDoneFlag is not properly cleared

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 33:810074d10fcf 202 if (seqid[src_addr] <= foreign_seqid)
rba90 31:a0454fda1538 203 {
rba90 31:a0454fda1538 204 setAckedFlag(src_addr);
rba90 31:a0454fda1538 205 }
rba90 31:a0454fda1538 206 printf("frame_seqid: %d, local_seqid: %d\r\n", frame->getSequenceID(), seqid[frame->getSourceAddress()]);
rba90 31:a0454fda1538 207
rba90 27:463688e3bd12 208 }
rba90 27:463688e3bd12 209
rba90 27:463688e3bd12 210 // check registered callback function
rba90 27:463688e3bd12 211 // execute callback functions if registered
rba90 27:463688e3bd12 212 if (AlohaTypeCallbackTable[type] != NULL)
rba90 27:463688e3bd12 213 {
rba90 27:463688e3bd12 214 uint8_t payload_length = frame->getPayloadLength();
rba90 27:463688e3bd12 215 uint8_t payload[payload_length];
rba90 27:463688e3bd12 216 uint8_t src_addr = frame->getSourceAddress();
rba90 27:463688e3bd12 217
rba90 27:463688e3bd12 218 // extract payload
rba90 27:463688e3bd12 219 for (uint8_t i = 0; i < payload_length; i++)
rba90 27:463688e3bd12 220 {
rba90 27:463688e3bd12 221 payload[i] = frame->getPayload(i);
rba90 27:463688e3bd12 222 }
rba90 27:463688e3bd12 223
rba90 27:463688e3bd12 224 // execute callback function
rba90 27:463688e3bd12 225 AlohaTypeCallbackTable[type](payload, payload_length, src_addr);
rba90 27:463688e3bd12 226 }
rba90 26:e87c8d345644 227 }
rba90 17:c6e2e2cd6e5f 228
rba90 27:463688e3bd12 229 // free memory
rba90 27:463688e3bd12 230 delete frame;
rba90 0:e2ccabf3f30c 231 }
rba90 0:e2ccabf3f30c 232
rba90 10:065a4b58c6ff 233 Radio.Rx( 0 );
rba90 0:e2ccabf3f30c 234 State = LOWPOWER;
rba90 0:e2ccabf3f30c 235 break;
rba90 0:e2ccabf3f30c 236 }
rba90 0:e2ccabf3f30c 237 case TX:
rba90 0:e2ccabf3f30c 238 {
rba90 28:2c0e115b4f72 239 // set tx to done, allow next transmission
rba90 28:2c0e115b4f72 240 setTxDoneFlag();
rba90 28:2c0e115b4f72 241
rba90 10:065a4b58c6ff 242 Radio.Rx( 0 );
rba90 0:e2ccabf3f30c 243 State = LOWPOWER;
rba90 0:e2ccabf3f30c 244 break;
rba90 0:e2ccabf3f30c 245 }
rba90 0:e2ccabf3f30c 246 case RX_TIMEOUT:
rba90 0:e2ccabf3f30c 247 {
rba90 10:065a4b58c6ff 248 Radio.Rx( 0 );
rba90 0:e2ccabf3f30c 249 State = LOWPOWER;
rba90 0:e2ccabf3f30c 250 break;
rba90 0:e2ccabf3f30c 251 }
rba90 0:e2ccabf3f30c 252 case RX_ERROR:
rba90 0:e2ccabf3f30c 253 {
rba90 10:065a4b58c6ff 254 Radio.Rx( 0 );
rba90 0:e2ccabf3f30c 255 State = LOWPOWER;
rba90 0:e2ccabf3f30c 256 break;
rba90 0:e2ccabf3f30c 257 }
rba90 0:e2ccabf3f30c 258 case TX_TIMEOUT:
rba90 0:e2ccabf3f30c 259 {
rba90 29:6c59b0bba861 260 // set tx to done, allow next transmission
rba90 29:6c59b0bba861 261 setTxDoneFlag();
rba90 29:6c59b0bba861 262
rba90 10:065a4b58c6ff 263 Radio.Rx( 0 );
rba90 0:e2ccabf3f30c 264 State = LOWPOWER;
rba90 0:e2ccabf3f30c 265 break;
rba90 0:e2ccabf3f30c 266 }
rba90 0:e2ccabf3f30c 267 case LOWPOWER:
rba90 0:e2ccabf3f30c 268 {
rba90 22:2e39f382f782 269 // transmit packet when the radio is free
rba90 31:a0454fda1538 270 if (getTxDoneFlag())
rba90 22:2e39f382f782 271 {
rba90 31:a0454fda1538 272 // find next available packet to transmit
rba90 31:a0454fda1538 273 for (size_t i = 0; i < AlohaTxQueue.getCounter(); i++)
rba90 31:a0454fda1538 274 {
rba90 31:a0454fda1538 275 AlohaFrame *frame = AlohaTxQueue.dequeue();
rba90 33:810074d10fcf 276
rba90 31:a0454fda1538 277 // determined by the type of the frame, only data frame need to be cleared before transmitting
rba90 33:810074d10fcf 278 switch (frame->getType())
rba90 31:a0454fda1538 279 {
rba90 31:a0454fda1538 280 // ack frame can transmit directly
rba90 31:a0454fda1538 281 case AlohaFrame::Aloha_ACK:
rba90 31:a0454fda1538 282 {
rba90 31:a0454fda1538 283 sendFrame(frame);
rba90 33:810074d10fcf 284
rba90 33:810074d10fcf 285 // block the next transmission until previous transmission is done
rba90 33:810074d10fcf 286 clearTxDoneFlag();
rba90 33:810074d10fcf 287
rba90 33:810074d10fcf 288 // free memory
rba90 32:b7d87c5f647c 289 delete frame;
rba90 32:b7d87c5f647c 290
rba90 31:a0454fda1538 291 break;
rba90 31:a0454fda1538 292 }
rba90 31:a0454fda1538 293 case AlohaFrame::Aloha_Data:
rba90 31:a0454fda1538 294 {
rba90 31:a0454fda1538 295 uint8_t dest_addr = frame->getDestinationAddress();
rba90 31:a0454fda1538 296
rba90 31:a0454fda1538 297 // depending on the availability of the destination host,
rba90 31:a0454fda1538 298 // the radio will on transmit the packet when acked
rba90 31:a0454fda1538 299 if (getAckedFlag(dest_addr))
rba90 31:a0454fda1538 300 {
rba90 31:a0454fda1538 301 sendFrame(frame);
rba90 31:a0454fda1538 302
rba90 31:a0454fda1538 303 // block the next transmission until previous transmission is done
rba90 31:a0454fda1538 304 clearTxDoneFlag();
rba90 31:a0454fda1538 305
rba90 31:a0454fda1538 306 // block the next transmission of the same host until an acked packet
rba90 31:a0454fda1538 307 // is received
rba90 31:a0454fda1538 308 clearAckedFlag(dest_addr);
rba90 31:a0454fda1538 309
rba90 31:a0454fda1538 310 // free memory
rba90 31:a0454fda1538 311 delete frame;
rba90 31:a0454fda1538 312 }
rba90 31:a0454fda1538 313
rba90 31:a0454fda1538 314 // otherwise put the packet back to the end of queue and wait for its being acked
rba90 31:a0454fda1538 315 else
rba90 31:a0454fda1538 316 {
rba90 31:a0454fda1538 317 AlohaTxQueue.enqueue(frame);
rba90 31:a0454fda1538 318 }
rba90 31:a0454fda1538 319 break;
rba90 31:a0454fda1538 320 }
rba90 31:a0454fda1538 321
rba90 31:a0454fda1538 322 default:
rba90 33:810074d10fcf 323 {
rba90 33:810074d10fcf 324 delete frame;
rba90 31:a0454fda1538 325 break;
rba90 33:810074d10fcf 326 }
rba90 31:a0454fda1538 327 }
rba90 31:a0454fda1538 328 }
rba90 22:2e39f382f782 329 }
rba90 0:e2ccabf3f30c 330 break;
rba90 0:e2ccabf3f30c 331 }
rba90 0:e2ccabf3f30c 332 default:
rba90 0:e2ccabf3f30c 333 {
rba90 0:e2ccabf3f30c 334 State = LOWPOWER;
rba90 0:e2ccabf3f30c 335 break;
rba90 0:e2ccabf3f30c 336 }
rba90 0:e2ccabf3f30c 337 }
rba90 0:e2ccabf3f30c 338 }
rba90 0:e2ccabf3f30c 339
rba90 31:a0454fda1538 340 void AlohaTransceiver::sendFrame(AlohaFrame *frame)
rba90 31:a0454fda1538 341 {
rba90 31:a0454fda1538 342 // create a buffer for transmit
rba90 31:a0454fda1538 343 uint8_t frame_length = frame->getPayloadLength() + FIXED_BYTE;
rba90 31:a0454fda1538 344 uint8_t buffer[frame_length]; // 4 fix fields
rba90 31:a0454fda1538 345 memset(buffer, 0x0, sizeof(buffer));
rba90 31:a0454fda1538 346
rba90 31:a0454fda1538 347 // copy content to buffer
rba90 31:a0454fda1538 348 frame->serialize(buffer);
rba90 31:a0454fda1538 349
rba90 31:a0454fda1538 350 // send to radio
rba90 31:a0454fda1538 351 Radio.Send(buffer, frame_length);
rba90 31:a0454fda1538 352 }
rba90 31:a0454fda1538 353
rba90 24:8f31c33c7675 354 bool AlohaTransceiver::send(BasicPacket *packet)
rba90 24:8f31c33c7675 355 {
rba90 24:8f31c33c7675 356 // for the reason that we only transmit basic packet format, the
rba90 24:8f31c33c7675 357 // length is always 8
rba90 24:8f31c33c7675 358 uint8_t payload_length = 8;
rba90 24:8f31c33c7675 359
rba90 24:8f31c33c7675 360 // get destination address
rba90 24:8f31c33c7675 361 uint8_t destination_address = findNextHop(packet->getDestinationID());
rba90 24:8f31c33c7675 362
rba90 24:8f31c33c7675 363 // serialize the packet from upper layer
rba90 24:8f31c33c7675 364 uint8_t buffer[payload_length];
rba90 24:8f31c33c7675 365 memset(buffer, 0x0, sizeof(buffer));
rba90 24:8f31c33c7675 366
rba90 24:8f31c33c7675 367 // copy bytes into buffer
rba90 24:8f31c33c7675 368 packet->serialize(buffer);
rba90 17:c6e2e2cd6e5f 369
rba90 17:c6e2e2cd6e5f 370 // create a new frame
rba90 22:2e39f382f782 371 AlohaFrame *frame = new AlohaFrame();
rba90 17:c6e2e2cd6e5f 372
rba90 22:2e39f382f782 373 // set properfies
rba90 24:8f31c33c7675 374 // set payload as data
rba90 22:2e39f382f782 375 frame->setType(AlohaFrame::Aloha_Data);
rba90 24:8f31c33c7675 376
rba90 24:8f31c33c7675 377 // set payload length (8 bytes for BasicPacket)
rba90 22:2e39f382f782 378 frame->setPayloadLength(payload_length);
rba90 24:8f31c33c7675 379
rba90 24:8f31c33c7675 380 // set mac layer device id
rba90 22:2e39f382f782 381 frame->setSourceAddress(deviceId);
rba90 24:8f31c33c7675 382
rba90 24:8f31c33c7675 383 // set mac layer destination id
rba90 24:8f31c33c7675 384 // for multiple hop system, the destination is the next hop
rba90 24:8f31c33c7675 385 // in this case, we use destination id from upper layer
rba90 24:8f31c33c7675 386 frame->setDestinationAddress(packet->getDestinationID());
rba90 24:8f31c33c7675 387
rba90 24:8f31c33c7675 388 // set full message flag (always true in this case)
rba90 22:2e39f382f782 389 frame->setFullMessageFlag(0x1);
rba90 22:2e39f382f782 390
rba90 24:8f31c33c7675 391 // use dest_addr as key for accessing sequence id
rba90 24:8f31c33c7675 392 // the seqid should increase as it successfully transmit the packet
rba90 24:8f31c33c7675 393 frame->setSequenceID(seqid[destination_address]++);
rba90 24:8f31c33c7675 394
rba90 22:2e39f382f782 395 // set payload
rba90 17:c6e2e2cd6e5f 396 for (uint8_t i = 0; i < payload_length; i++)
rba90 17:c6e2e2cd6e5f 397 {
rba90 24:8f31c33c7675 398 frame->setPayload(i, buffer[i]);
rba90 17:c6e2e2cd6e5f 399 }
rba90 17:c6e2e2cd6e5f 400
rba90 17:c6e2e2cd6e5f 401 // calculate crc
rba90 22:2e39f382f782 402 frame->generateCrc();
rba90 17:c6e2e2cd6e5f 403
rba90 22:2e39f382f782 404 // push frame to the back of queue
rba90 22:2e39f382f782 405 AlohaTxQueue.enqueue(frame);
rba90 27:463688e3bd12 406
rba90 27:463688e3bd12 407 // debug
rba90 27:463688e3bd12 408 #ifdef DEBUG_ALOHA
rba90 29:6c59b0bba861 409 printf("\r\nTXDATA::DEST_ADDR:0x%x,SEQID:0x%x\r\n", frame->getDestinationAddress(), frame->getSequenceID());
rba90 27:463688e3bd12 410 #endif
rba90 17:c6e2e2cd6e5f 411 return true;
rba90 0:e2ccabf3f30c 412 }
rba90 0:e2ccabf3f30c 413
rba90 25:bcd1cee4e5a8 414 void AlohaTransceiver::sendAck(AlohaFrame *inFrame)
rba90 25:bcd1cee4e5a8 415 {
rba90 25:bcd1cee4e5a8 416 // create a new frame by calling it's constructor
rba90 25:bcd1cee4e5a8 417 AlohaFrame *outFrame = new AlohaFrame();
rba90 25:bcd1cee4e5a8 418
rba90 25:bcd1cee4e5a8 419 // set frame type
rba90 25:bcd1cee4e5a8 420 outFrame->setType(AlohaFrame::Aloha_ACK);
rba90 25:bcd1cee4e5a8 421
rba90 25:bcd1cee4e5a8 422 // set payload length (0 byte payload for ack frame)
rba90 25:bcd1cee4e5a8 423 outFrame->setPayloadLength(0);
rba90 25:bcd1cee4e5a8 424
rba90 25:bcd1cee4e5a8 425 // set mac layer device id
rba90 25:bcd1cee4e5a8 426 outFrame->setSourceAddress(deviceId);
rba90 25:bcd1cee4e5a8 427
rba90 25:bcd1cee4e5a8 428 // set mac layer destination id
rba90 25:bcd1cee4e5a8 429 outFrame->setDestinationAddress(inFrame->getSourceAddress());
rba90 25:bcd1cee4e5a8 430
rba90 25:bcd1cee4e5a8 431 // set full message flag
rba90 25:bcd1cee4e5a8 432 outFrame->setFullMessageFlag(0x1);
rba90 25:bcd1cee4e5a8 433
rba90 25:bcd1cee4e5a8 434 // set seqid
rba90 25:bcd1cee4e5a8 435 // the sequence id is always the source id + 1
rba90 25:bcd1cee4e5a8 436 outFrame->setSequenceID(inFrame->getSequenceID() + 1);
rba90 25:bcd1cee4e5a8 437
rba90 25:bcd1cee4e5a8 438 // no payload
rba90 25:bcd1cee4e5a8 439
rba90 25:bcd1cee4e5a8 440 // generate cec
rba90 25:bcd1cee4e5a8 441 outFrame->generateCrc();
rba90 25:bcd1cee4e5a8 442
rba90 25:bcd1cee4e5a8 443 // push frame to the back of queue
rba90 25:bcd1cee4e5a8 444 AlohaTxQueue.enqueue(outFrame);
rba90 25:bcd1cee4e5a8 445
rba90 25:bcd1cee4e5a8 446 // debug
rba90 25:bcd1cee4e5a8 447 #ifdef DEBUG_ALOHA
rba90 29:6c59b0bba861 448 printf("\r\nTXACK::DEST_ADDR:0x%x,SEQID:0x%x\r\n", outFrame->getDestinationAddress(), outFrame->getSequenceID());
rba90 25:bcd1cee4e5a8 449 #endif
rba90 25:bcd1cee4e5a8 450 }
rba90 25:bcd1cee4e5a8 451
rba90 28:2c0e115b4f72 452 bool AlohaTransceiver::getTxDoneFlag()
rba90 28:2c0e115b4f72 453 {
rba90 31:a0454fda1538 454 return isTxDone;
rba90 28:2c0e115b4f72 455 }
rba90 28:2c0e115b4f72 456
rba90 28:2c0e115b4f72 457 void AlohaTransceiver::setTxDoneFlag()
rba90 28:2c0e115b4f72 458 {
rba90 31:a0454fda1538 459 isTxDone = true;
rba90 28:2c0e115b4f72 460 }
rba90 28:2c0e115b4f72 461
rba90 28:2c0e115b4f72 462 void AlohaTransceiver::clearTxDoneFlag()
rba90 28:2c0e115b4f72 463 {
rba90 31:a0454fda1538 464 isTxDone = false;
rba90 31:a0454fda1538 465 }
rba90 31:a0454fda1538 466
rba90 31:a0454fda1538 467 bool AlohaTransceiver::getAckedFlag(uint8_t addr)
rba90 31:a0454fda1538 468 {
rba90 31:a0454fda1538 469 return CHECK_FLAG(isAcked, addr);
rba90 31:a0454fda1538 470 }
rba90 31:a0454fda1538 471
rba90 31:a0454fda1538 472 void AlohaTransceiver::setAckedFlag(uint8_t addr)
rba90 31:a0454fda1538 473 {
rba90 31:a0454fda1538 474 SET_FLAG(isAcked, addr);
rba90 31:a0454fda1538 475 }
rba90 31:a0454fda1538 476
rba90 31:a0454fda1538 477 void AlohaTransceiver::clearAckedFlag(uint8_t addr)
rba90 31:a0454fda1538 478 {
rba90 31:a0454fda1538 479 CLEAR_FLAG(isAcked, addr);
rba90 28:2c0e115b4f72 480 }
rba90 28:2c0e115b4f72 481
rba90 0:e2ccabf3f30c 482 void AlohaTransceiver::registerType(AlohaFrame::AlohaType_t type, aloha_callback_func f)
rba90 0:e2ccabf3f30c 483 {
rba90 0:e2ccabf3f30c 484 AlohaTypeCallbackTable[type] = f;
rba90 0:e2ccabf3f30c 485 }
rba90 0:e2ccabf3f30c 486
rba90 0:e2ccabf3f30c 487 void AlohaTransceiver::deRegisterType(AlohaFrame::AlohaType_t type, aloha_callback_func f)
rba90 0:e2ccabf3f30c 488 {
rba90 0:e2ccabf3f30c 489 AlohaTypeCallbackTable[type] = NULL;
rba90 0:e2ccabf3f30c 490 }
rba90 0:e2ccabf3f30c 491
rba90 2:fa264e48d5f7 492 int16_t AlohaTransceiver::getRssi()
rba90 2:fa264e48d5f7 493 {
rba90 2:fa264e48d5f7 494 return RssiValue;
rba90 2:fa264e48d5f7 495 }
rba90 2:fa264e48d5f7 496
rba90 2:fa264e48d5f7 497 int8_t AlohaTransceiver::getSnr()
rba90 2:fa264e48d5f7 498 {
rba90 2:fa264e48d5f7 499 return SnrValue;
rba90 2:fa264e48d5f7 500 }
rba90 2:fa264e48d5f7 501
rba90 17:c6e2e2cd6e5f 502 uint8_t AlohaTransceiver::getDeviceID()
rba90 11:3e1ff29da71a 503 {
rba90 11:3e1ff29da71a 504 return deviceId;
rba90 11:3e1ff29da71a 505 }
rba90 11:3e1ff29da71a 506
rba90 17:c6e2e2cd6e5f 507 void AlohaTransceiver::setDeviceID(uint8_t id)
rba90 11:3e1ff29da71a 508 {
rba90 11:3e1ff29da71a 509 deviceId = id;
rba90 11:3e1ff29da71a 510 }
rba90 11:3e1ff29da71a 511
rba90 24:8f31c33c7675 512 uint8_t AlohaTransceiver::findNextHop(uint8_t addr)
rba90 24:8f31c33c7675 513 {
rba90 24:8f31c33c7675 514 // TODO: maintain a routing lookup table for choosing shortest path
rba90 24:8f31c33c7675 515 return addr;
rba90 24:8f31c33c7675 516 }
rba90 24:8f31c33c7675 517
rba90 8:4bda842f73d4 518 #if USE_MODEM_LORA == 1
rba90 8:4bda842f73d4 519 AlohaTransceiver::LoRaSettings_t *AlohaTransceiver::getSettings()
rba90 8:4bda842f73d4 520 {
rba90 8:4bda842f73d4 521 return &Settings;
rba90 8:4bda842f73d4 522 }
rba90 8:4bda842f73d4 523
rba90 8:4bda842f73d4 524 #elif USE_MODEM_FSK == 1
rba90 8:4bda842f73d4 525 AlohaTransceiver::FskSettings_t *AlohaTransceiver::getSettings()
rba90 8:4bda842f73d4 526 {
rba90 8:4bda842f73d4 527 return &Settings;
rba90 8:4bda842f73d4 528 }
rba90 8:4bda842f73d4 529 #else
rba90 8:4bda842f73d4 530 #error "Please define a modem in the compiler options."
rba90 8:4bda842f73d4 531 #endif
rba90 8:4bda842f73d4 532
rba90 0:e2ccabf3f30c 533 void OnTxDone( void )
rba90 0:e2ccabf3f30c 534 {
rba90 0:e2ccabf3f30c 535 Radio.Sleep( );
rba90 0:e2ccabf3f30c 536 State = TX;
rba90 18:3e6483550f25 537
rba90 18:3e6483550f25 538 #ifdef DEBUG_ALOHA
rba90 28:2c0e115b4f72 539 debug_if(ALLOW_CALLBACK_DEBUG, "> OnTxDone\n\r" );
rba90 18:3e6483550f25 540 #endif
rba90 0:e2ccabf3f30c 541 }
rba90 0:e2ccabf3f30c 542
rba90 0:e2ccabf3f30c 543 void OnRxDone( uint8_t *payload, uint16_t size, int16_t rssi, int8_t snr)
rba90 0:e2ccabf3f30c 544 {
rba90 27:463688e3bd12 545 uint8_t payload_length;
rba90 27:463688e3bd12 546
rba90 0:e2ccabf3f30c 547 Radio.Sleep( );
rba90 0:e2ccabf3f30c 548
rba90 0:e2ccabf3f30c 549 // safeguard: if size exceeded maximum buffer size, it will cause memory overflow
rba90 27:463688e3bd12 550 payload_length = size ? BUFFER_SIZE : size <= BUFFER_SIZE;
rba90 27:463688e3bd12 551
rba90 27:463688e3bd12 552 // create a new frame instance
rba90 27:463688e3bd12 553 AlohaFrame *frame = new AlohaFrame(payload, payload_length);
rba90 27:463688e3bd12 554
rba90 27:463688e3bd12 555 // push onto the end of queue
rba90 27:463688e3bd12 556 AlohaRxQueue.enqueue(frame);
rba90 0:e2ccabf3f30c 557
rba90 0:e2ccabf3f30c 558 RssiValue = rssi;
rba90 0:e2ccabf3f30c 559 SnrValue = snr;
rba90 0:e2ccabf3f30c 560 State = RX;
rba90 18:3e6483550f25 561
rba90 18:3e6483550f25 562 #ifdef DEBUG_ALOHA
rba90 28:2c0e115b4f72 563 debug_if(ALLOW_CALLBACK_DEBUG, "> OnRxDone\n\r" );
rba90 18:3e6483550f25 564 #endif
rba90 0:e2ccabf3f30c 565 }
rba90 0:e2ccabf3f30c 566
rba90 0:e2ccabf3f30c 567 void OnTxTimeout( void )
rba90 0:e2ccabf3f30c 568 {
rba90 0:e2ccabf3f30c 569 Radio.Sleep( );
rba90 0:e2ccabf3f30c 570 State = TX_TIMEOUT;
rba90 18:3e6483550f25 571
rba90 18:3e6483550f25 572 #ifdef DEBUG_ALOHA
rba90 28:2c0e115b4f72 573 debug_if(ALLOW_CALLBACK_DEBUG, "> OnTxTimeout\n\r" );
rba90 18:3e6483550f25 574 #endif
rba90 0:e2ccabf3f30c 575 }
rba90 0:e2ccabf3f30c 576
rba90 0:e2ccabf3f30c 577 void OnRxTimeout( void )
rba90 0:e2ccabf3f30c 578 {
rba90 0:e2ccabf3f30c 579 Radio.Sleep( );
rba90 0:e2ccabf3f30c 580 State = RX_TIMEOUT;
rba90 18:3e6483550f25 581
rba90 18:3e6483550f25 582 #ifdef DEBUG_ALOHA
rba90 28:2c0e115b4f72 583 debug_if(ALLOW_CALLBACK_DEBUG, "> OnRxTimeout\n\r" );
rba90 18:3e6483550f25 584 #endif
rba90 0:e2ccabf3f30c 585 }
rba90 0:e2ccabf3f30c 586
rba90 0:e2ccabf3f30c 587 void OnRxError( void )
rba90 0:e2ccabf3f30c 588 {
rba90 0:e2ccabf3f30c 589 Radio.Sleep( );
rba90 0:e2ccabf3f30c 590 State = RX_ERROR;
rba90 18:3e6483550f25 591
rba90 18:3e6483550f25 592 #ifdef DEBUG_ALOHA
rba90 28:2c0e115b4f72 593 debug_if(ALLOW_CALLBACK_DEBUG, "> OnRxError\n\r" );
rba90 18:3e6483550f25 594 #endif
rba90 0:e2ccabf3f30c 595 }
rba90 24:8f31c33c7675 596