// ********************************************************************************** // Driver definition for HopeRF RFM69W/RFM69HW/RFM69CW/RFM69HCW, Semtech SX1231/1231H // ********************************************************************************** // Copyright LowPowerLab LLC 2018, https://www.LowPowerLab.com/contact // ********************************************************************************** // License // ********************************************************************************** // This program is free software; you can redistribute it // and/or modify it under the terms of the GNU General // Public License as published by the Free Software // Foundation; either version 3 of the License, or // (at your option) any later version. // // This program is distributed in the hope that it will // be useful, but WITHOUT ANY WARRANTY; without even the // implied warranty of MERCHANTABILITY or FITNESS FOR A // PARTICULAR PURPOSE. See the GNU General Public // License for more details. // // Licence can be viewed at // http://www.gnu.org/licenses/gpl-3.0.txt // // Please maintain this license information along with authorship // and copyright notices in any redistribution of this code // ********************************************************************************** #include "RFM69.h" #include "RFM69registers.h" #include uint8_t RFM69::DATA[RF69_MAX_DATA_LEN+1]; uint8_t RFM69::_mode; // current transceiver state uint8_t RFM69::DATALEN; uint16_t RFM69::SENDERID; uint16_t RFM69::TARGETID; // should match _address uint8_t RFM69::PAYLOADLEN; uint8_t RFM69::ACK_REQUESTED; uint8_t RFM69::ACK_RECEIVED; // should be polled immediately after sending a packet with ACK request int16_t RFM69::RSSI; // most accurate RSSI during reception (closest to the reception) volatile bool RFM69::_haveData; RFM69::RFM69(uint8_t slaveSelectPin, uint8_t interruptPin, bool isRFM69HW, SPIClass *spi) { _slaveSelectPin = slaveSelectPin; _interruptPin = interruptPin; _mode = RF69_MODE_STANDBY; _spyMode = false; _powerLevel = 31; _isRFM69HW = isRFM69HW; _spi = spi; #if defined(RF69_LISTENMODE_ENABLE) _isHighSpeed = true; _haveEncryptKey = false; uint32_t rxDuration = DEFAULT_LISTEN_RX_US; uint32_t idleDuration = DEFAULT_LISTEN_IDLE_US; listenModeSetDurations(rxDuration, idleDuration); #endif } bool RFM69::initialize(uint8_t freqBand, uint16_t nodeID, uint8_t networkID) { _interruptNum = digitalPinToInterrupt(_interruptPin); if (_interruptNum == NOT_AN_INTERRUPT) return false; #ifdef RF69_ATTACHINTERRUPT_TAKES_PIN_NUMBER _interruptNum = _interruptPin; #endif const uint8_t CONFIG[][2] = { /* 0x01 */ { REG_OPMODE, RF_OPMODE_SEQUENCER_ON | RF_OPMODE_LISTEN_OFF | RF_OPMODE_STANDBY }, /* 0x02 */ { REG_DATAMODUL, RF_DATAMODUL_DATAMODE_PACKET | RF_DATAMODUL_MODULATIONTYPE_FSK | RF_DATAMODUL_MODULATIONSHAPING_00 }, // no shaping /* 0x03 */ { REG_BITRATEMSB, RF_BITRATEMSB_55555}, // default: 4.8 KBPS /* 0x04 */ { REG_BITRATELSB, RF_BITRATELSB_55555}, /* 0x05 */ { REG_FDEVMSB, RF_FDEVMSB_50000}, // default: 5KHz, (FDEV + BitRate / 2 <= 500KHz) /* 0x06 */ { REG_FDEVLSB, RF_FDEVLSB_50000}, /* 0x07 */ { REG_FRFMSB, (uint8_t) (freqBand==RF69_315MHZ ? RF_FRFMSB_315 : (freqBand==RF69_433MHZ ? RF_FRFMSB_433 : (freqBand==RF69_868MHZ ? RF_FRFMSB_868 : RF_FRFMSB_915))) }, /* 0x08 */ { REG_FRFMID, (uint8_t) (freqBand==RF69_315MHZ ? RF_FRFMID_315 : (freqBand==RF69_433MHZ ? RF_FRFMID_433 : (freqBand==RF69_868MHZ ? RF_FRFMID_868 : RF_FRFMID_915))) }, /* 0x09 */ { REG_FRFLSB, (uint8_t) (freqBand==RF69_315MHZ ? RF_FRFLSB_315 : (freqBand==RF69_433MHZ ? RF_FRFLSB_433 : (freqBand==RF69_868MHZ ? RF_FRFLSB_868 : RF_FRFLSB_915))) }, // looks like PA1 and PA2 are not implemented on RFM69W/CW, hence the max output power is 13dBm // +17dBm and +20dBm are possible on RFM69HW // +13dBm formula: Pout = -18 + OutputPower (with PA0 or PA1**) // +17dBm formula: Pout = -14 + OutputPower (with PA1 and PA2)** // +20dBm formula: Pout = -11 + OutputPower (with PA1 and PA2)** and high power PA settings (section 3.3.7 in datasheet) ///* 0x11 */ { REG_PALEVEL, RF_PALEVEL_PA0_ON | RF_PALEVEL_PA1_OFF | RF_PALEVEL_PA2_OFF | RF_PALEVEL_OUTPUTPOWER_11111}, ///* 0x13 */ { REG_OCP, RF_OCP_ON | RF_OCP_TRIM_95 }, // over current protection (default is 95mA) // RXBW defaults are { REG_RXBW, RF_RXBW_DCCFREQ_010 | RF_RXBW_MANT_24 | RF_RXBW_EXP_5} (RxBw: 10.4KHz) /* 0x19 */ { REG_RXBW, RF_RXBW_DCCFREQ_010 | RF_RXBW_MANT_16 | RF_RXBW_EXP_2 }, // (BitRate < 2 * RxBw) //for BR-19200: /* 0x19 */ { REG_RXBW, RF_RXBW_DCCFREQ_010 | RF_RXBW_MANT_24 | RF_RXBW_EXP_3 }, /* 0x25 */ { REG_DIOMAPPING1, RF_DIOMAPPING1_DIO0_01 }, // DIO0 is the only IRQ we're using /* 0x26 */ { REG_DIOMAPPING2, RF_DIOMAPPING2_CLKOUT_OFF }, // DIO5 ClkOut disable for power saving /* 0x28 */ { REG_IRQFLAGS2, RF_IRQFLAGS2_FIFOOVERRUN }, // writing to this bit ensures that the FIFO & status flags are reset /* 0x29 */ { REG_RSSITHRESH, 220 }, // must be set to dBm = (-Sensitivity / 2), default is 0xE4 = 228 so -114dBm ///* 0x2D */ { REG_PREAMBLELSB, RF_PREAMBLESIZE_LSB_VALUE } // default 3 preamble bytes 0xAAAAAA /* 0x2E */ { REG_SYNCCONFIG, RF_SYNC_ON | RF_SYNC_FIFOFILL_AUTO | RF_SYNC_SIZE_2 | RF_SYNC_TOL_0 }, /* 0x2F */ { REG_SYNCVALUE1, 0x2D }, // attempt to make this compatible with sync1 byte of RFM12B lib /* 0x30 */ { REG_SYNCVALUE2, networkID }, // NETWORK ID //* 0x31 */ { REG_SYNCVALUE3, 0xAA }, //* 0x31 */ { REG_SYNCVALUE4, 0xBB }, /* 0x37 */ { REG_PACKETCONFIG1, RF_PACKET1_FORMAT_VARIABLE | RF_PACKET1_DCFREE_OFF | RF_PACKET1_CRC_ON | RF_PACKET1_CRCAUTOCLEAR_ON | RF_PACKET1_ADRSFILTERING_OFF }, /* 0x38 */ { REG_PAYLOADLENGTH, 66 }, // in variable length mode: the max frame size, not used in TX ///* 0x39 */ { REG_NODEADRS, nodeID }, // turned off because we're not using address filtering /* 0x3C */ { REG_FIFOTHRESH, RF_FIFOTHRESH_TXSTART_FIFONOTEMPTY | RF_FIFOTHRESH_VALUE }, // TX on FIFO not empty /* 0x3D */ { REG_PACKETCONFIG2, RF_PACKET2_RXRESTARTDELAY_2BITS | RF_PACKET2_AUTORXRESTART_ON | RF_PACKET2_AES_OFF }, // RXRESTARTDELAY must match transmitter PA ramp-down time (bitrate dependent) //for BR-19200: /* 0x3D */ { REG_PACKETCONFIG2, RF_PACKET2_RXRESTARTDELAY_NONE | RF_PACKET2_AUTORXRESTART_ON | RF_PACKET2_AES_OFF }, // RXRESTARTDELAY must match transmitter PA ramp-down time (bitrate dependent) /* 0x6F */ { REG_TESTDAGC, RF_DAGC_IMPROVED_LOWBETA0 }, // run DAGC continuously in RX mode for Fading Margin Improvement, recommended default for AfcLowBetaOn=0 {255, 0} }; digitalWrite(_slaveSelectPin, HIGH); pinMode(_slaveSelectPin, OUTPUT); if(_spi == nullptr){ _spi = &SPI; } #if defined(ESP32) _spi->begin(18,19,23,5); //SPI3 (SCK,MISO,MOSI,CS) //_spi->begin(14,12,13,15); //SPI2 (SCK,MISO,MOSI,CS) #else _spi->begin(); #endif #ifdef SPI_HAS_TRANSACTION _settings = SPISettings(8000000, MSBFIRST, SPI_MODE0); #endif uint32_t start = millis(); uint8_t timeout = 50; do writeReg(REG_SYNCVALUE1, 0xAA); while (readReg(REG_SYNCVALUE1) != 0xaa && millis()-start < timeout); start = millis(); do writeReg(REG_SYNCVALUE1, 0x55); while (readReg(REG_SYNCVALUE1) != 0x55 && millis()-start < timeout); for (uint8_t i = 0; CONFIG[i][0] != 255; i++) writeReg(CONFIG[i][0], CONFIG[i][1]); // Encryption is persistent between resets and can trip you up during debugging. // Disable it during initialization so we always start from a known state. encrypt(0); setHighPower(_isRFM69HW); // called regardless if it's a RFM69W or RFM69HW setMode(RF69_MODE_STANDBY); start = millis(); while (((readReg(REG_IRQFLAGS1) & RF_IRQFLAGS1_MODEREADY) == 0x00) && millis()-start < timeout); // wait for ModeReady if (millis()-start >= timeout) return false; attachInterrupt(_interruptNum, RFM69::isr0, RISING); _address = nodeID; #if defined(RF69_LISTENMODE_ENABLE) selfPointer = this; _freqBand = freqBand; _networkID = networkID; #endif return true; } // return the frequency (in Hz) uint32_t RFM69::getFrequency() { return RF69_FSTEP * (((uint32_t) readReg(REG_FRFMSB) << 16) + ((uint16_t) readReg(REG_FRFMID) << 8) + readReg(REG_FRFLSB)); } // set the frequency (in Hz) void RFM69::setFrequency(uint32_t freqHz) { uint8_t oldMode = _mode; if (oldMode == RF69_MODE_TX) { setMode(RF69_MODE_RX); } freqHz /= RF69_FSTEP; // divide down by FSTEP to get FRF writeReg(REG_FRFMSB, freqHz >> 16); writeReg(REG_FRFMID, freqHz >> 8); writeReg(REG_FRFLSB, freqHz); if (oldMode == RF69_MODE_RX) { setMode(RF69_MODE_SYNTH); } setMode(oldMode); } void RFM69::setMode(uint8_t newMode) { if (newMode == _mode) return; switch (newMode) { case RF69_MODE_TX: writeReg(REG_OPMODE, (readReg(REG_OPMODE) & 0xE3) | RF_OPMODE_TRANSMITTER); if (_isRFM69HW) setHighPowerRegs(true); break; case RF69_MODE_RX: writeReg(REG_OPMODE, (readReg(REG_OPMODE) & 0xE3) | RF_OPMODE_RECEIVER); if (_isRFM69HW) setHighPowerRegs(false); break; case RF69_MODE_SYNTH: writeReg(REG_OPMODE, (readReg(REG_OPMODE) & 0xE3) | RF_OPMODE_SYNTHESIZER); break; case RF69_MODE_STANDBY: writeReg(REG_OPMODE, (readReg(REG_OPMODE) & 0xE3) | RF_OPMODE_STANDBY); break; case RF69_MODE_SLEEP: writeReg(REG_OPMODE, (readReg(REG_OPMODE) & 0xE3) | RF_OPMODE_SLEEP); break; default: return; } // we are using packet mode, so this check is not really needed // but waiting for mode ready is necessary when going from sleep because the FIFO may not be immediately available from previous mode while (_mode == RF69_MODE_SLEEP && (readReg(REG_IRQFLAGS1) & RF_IRQFLAGS1_MODEREADY) == 0x00); // wait for ModeReady _mode = newMode; } //put transceiver in sleep mode to save battery - to wake or resume receiving just call receiveDone() void RFM69::sleep() { setMode(RF69_MODE_SLEEP); } //set this node's address void RFM69::setAddress(uint16_t addr) { _address = addr; writeReg(REG_NODEADRS, _address); //unused in packet mode } //set this node's network id void RFM69::setNetwork(uint8_t networkID) { writeReg(REG_SYNCVALUE2, networkID); } // set *transmit/TX* output power: 0=min, 31=max // this results in a "weaker" transmitted signal, and directly results in a lower RSSI at the receiver // the power configurations are explained in the SX1231H datasheet (Table 10 on p21; RegPaLevel p66): http://www.semtech.com/images/datasheet/sx1231h.pdf // valid powerLevel parameter values are 0-31 and result in a directly proportional effect on the output/transmission power // this function implements 2 modes as follows: // - for RFM69W the range is from 0-31 [-18dBm to 13dBm] (PA0 only on RFIO pin) // - for RFM69HW the range is from 0-31 [5dBm to 20dBm] (PA1 & PA2 on PA_BOOST pin & high Power PA settings - see section 3.3.7 in datasheet, p22) void RFM69::setPowerLevel(uint8_t powerLevel) { _powerLevel = (powerLevel > 31 ? 31 : powerLevel); if (_isRFM69HW) _powerLevel /= 2; writeReg(REG_PALEVEL, (readReg(REG_PALEVEL) & 0xE0) | _powerLevel); } uint8_t RFM69::getPowerLevel() // get powerLevel { return _powerLevel; } bool RFM69::canSend() { if (_mode == RF69_MODE_RX && PAYLOADLEN == 0 && readRSSI() < CSMA_LIMIT) // if signal stronger than -100dBm is detected assume channel activity { setMode(RF69_MODE_STANDBY); return true; } return false; } void RFM69::send(uint16_t toAddress, const void* buffer, uint8_t bufferSize, bool requestACK) { writeReg(REG_PACKETCONFIG2, (readReg(REG_PACKETCONFIG2) & 0xFB) | RF_PACKET2_RXRESTART); // avoid RX deadlocks uint32_t now = millis(); while (!canSend() && millis() - now < RF69_CSMA_LIMIT_MS) receiveDone(); sendFrame(toAddress, buffer, bufferSize, requestACK, false); } // to increase the chance of getting a packet across, call this function instead of send // and it handles all the ACK requesting/retrying for you :) // The only twist is that you have to manually listen to ACK requests on the other side and send back the ACKs // The reason for the semi-automaton is that the lib is interrupt driven and // requires user action to read the received data and decide what to do with it // replies usually take only 5..8ms at 50kbps@915MHz bool RFM69::sendWithRetry(uint16_t toAddress, const void* buffer, uint8_t bufferSize, uint8_t retries, uint8_t retryWaitTime) { uint32_t sentTime; for (uint8_t i = 0; i <= retries; i++) { send(toAddress, buffer, bufferSize, true); sentTime = millis(); while (millis() - sentTime < retryWaitTime) { if (ACKReceived(toAddress)) return true; } } return false; } // should be polled immediately after sending a packet with ACK request bool RFM69::ACKReceived(uint16_t fromNodeID) { if (receiveDone()) return (SENDERID == fromNodeID || fromNodeID == RF69_BROADCAST_ADDR) && ACK_RECEIVED; return false; } // check whether an ACK was requested in the last received packet (non-broadcasted packet) bool RFM69::ACKRequested() { return ACK_REQUESTED && (TARGETID == _address); } // should be called immediately after reception in case sender wants ACK void RFM69::sendACK(const void* buffer, uint8_t bufferSize) { ACK_REQUESTED = 0; // TWS added to make sure we don't end up in a timing race and infinite loop sending Acks uint16_t sender = SENDERID; int16_t _RSSI = RSSI; // save payload received RSSI value writeReg(REG_PACKETCONFIG2, (readReg(REG_PACKETCONFIG2) & 0xFB) | RF_PACKET2_RXRESTART); // avoid RX deadlocks uint32_t now = millis(); while (!canSend() && millis() - now < RF69_CSMA_LIMIT_MS) receiveDone(); SENDERID = sender; // TWS: Restore SenderID after it gets wiped out by receiveDone() sendFrame(sender, buffer, bufferSize, false, true); RSSI = _RSSI; // restore payload RSSI } // internal function void RFM69::sendFrame(uint16_t toAddress, const void* buffer, uint8_t bufferSize, bool requestACK, bool sendACK) { //NOTE: overridden in RFM69_ATC! setMode(RF69_MODE_STANDBY); // turn off receiver to prevent reception while filling fifo while ((readReg(REG_IRQFLAGS1) & RF_IRQFLAGS1_MODEREADY) == 0x00); // wait for ModeReady //writeReg(REG_DIOMAPPING1, RF_DIOMAPPING1_DIO0_00); // DIO0 is "Packet Sent" if (bufferSize > RF69_MAX_DATA_LEN) bufferSize = RF69_MAX_DATA_LEN; // control byte uint8_t CTLbyte = 0x00; if (sendACK) CTLbyte = RFM69_CTL_SENDACK; else if (requestACK) CTLbyte = RFM69_CTL_REQACK; if (toAddress > 0xFF) CTLbyte |= (toAddress & 0x300) >> 6; //assign last 2 bits of address if > 255 if (_address > 0xFF) CTLbyte |= (_address & 0x300) >> 8; //assign last 2 bits of address if > 255 // write to FIFO select(); _spi->transfer(REG_FIFO | 0x80); _spi->transfer(bufferSize + 3); _spi->transfer((uint8_t)toAddress); _spi->transfer((uint8_t)_address); _spi->transfer(CTLbyte); for (uint8_t i = 0; i < bufferSize; i++) _spi->transfer(((uint8_t*) buffer)[i]); unselect(); // no need to wait for transmit mode to be ready since its handled by the radio setMode(RF69_MODE_TX); //uint32_t txStart = millis(); //while (digitalRead(_interruptPin) == 0 && millis() - txStart < RF69_TX_LIMIT_MS); // wait for DIO0 to turn HIGH signalling transmission finish while ((readReg(REG_IRQFLAGS2) & RF_IRQFLAGS2_PACKETSENT) == 0x00); // wait for PacketSent setMode(RF69_MODE_STANDBY); } // internal function - interrupt gets called when a packet is received void RFM69::interruptHandler() { if (_mode == RF69_MODE_RX && (readReg(REG_IRQFLAGS2) & RF_IRQFLAGS2_PAYLOADREADY)) { setMode(RF69_MODE_STANDBY); select(); _spi->transfer(REG_FIFO & 0x7F); PAYLOADLEN = _spi->transfer(0); PAYLOADLEN = PAYLOADLEN > 66 ? 66 : PAYLOADLEN; // precaution TARGETID = _spi->transfer(0); SENDERID = _spi->transfer(0); uint8_t CTLbyte = _spi->transfer(0); TARGETID |= (uint16_t(CTLbyte) & 0x0C) << 6; //10 bit address (most significant 2 bits stored in bits(2,3) of CTL byte SENDERID |= (uint16_t(CTLbyte) & 0x03) << 8; //10 bit address (most sifnigicant 2 bits stored in bits(0,1) of CTL byte if(!(_spyMode || TARGETID == _address || TARGETID == RF69_BROADCAST_ADDR) // match this node's address, or broadcast address or anything in spy mode || PAYLOADLEN < 3) // address situation could receive packets that are malformed and don't fit this libraries extra fields { PAYLOADLEN = 0; unselect(); receiveBegin(); return; } DATALEN = PAYLOADLEN - 3; ACK_RECEIVED = CTLbyte & RFM69_CTL_SENDACK; // extract ACK-received flag ACK_REQUESTED = CTLbyte & RFM69_CTL_REQACK; // extract ACK-requested flag interruptHook(CTLbyte); // TWS: hook to derived class interrupt function for (uint8_t i = 0; i < DATALEN; i++) DATA[i] = _spi->transfer(0); DATA[DATALEN] = 0; // add null at end of string // add null at end of string unselect(); setMode(RF69_MODE_RX); } RSSI = readRSSI(); } // internal function ISR_PREFIX void RFM69::isr0() { _haveData = true; } // internal function void RFM69::receiveBegin() { DATALEN = 0; SENDERID = 0; TARGETID = 0; PAYLOADLEN = 0; ACK_REQUESTED = 0; ACK_RECEIVED = 0; #if defined(RF69_LISTENMODE_ENABLE) RF69_LISTEN_BURST_REMAINING_MS = 0; #endif RSSI = 0; if (readReg(REG_IRQFLAGS2) & RF_IRQFLAGS2_PAYLOADREADY) writeReg(REG_PACKETCONFIG2, (readReg(REG_PACKETCONFIG2) & 0xFB) | RF_PACKET2_RXRESTART); // avoid RX deadlocks writeReg(REG_DIOMAPPING1, RF_DIOMAPPING1_DIO0_01); // set DIO0 to "PAYLOADREADY" in receive mode setMode(RF69_MODE_RX); } // checks if a packet was received and/or puts transceiver in receive (ie RX or listen) mode bool RFM69::receiveDone() { if (_haveData) { _haveData = false; interruptHandler(); } if (_mode == RF69_MODE_RX && PAYLOADLEN > 0) { setMode(RF69_MODE_STANDBY); // enables interrupts return true; } else if (_mode == RF69_MODE_RX) // already in RX no payload yet { return false; } receiveBegin(); return false; } // To enable encryption: radio.encrypt("ABCDEFGHIJKLMNOP"); // To disable encryption: radio.encrypt(null) or radio.encrypt(0) // KEY HAS TO BE 16 bytes !!! void RFM69::encrypt(const char* key) { #if defined(RF69_LISTENMODE_ENABLE) _haveEncryptKey = key; #endif setMode(RF69_MODE_STANDBY); uint8_t validKey = key != 0 && strlen(key)!=0; if (validKey) { #if defined(RF69_LISTENMODE_ENABLE) memcpy(_encryptKey, key, 16); #endif select(); _spi->transfer(REG_AESKEY1 | 0x80); for (uint8_t i = 0; i < 16; i++) _spi->transfer(key[i]); unselect(); } writeReg(REG_PACKETCONFIG2, (readReg(REG_PACKETCONFIG2) & 0xFE) | (validKey ? 1 : 0)); } // get the received signal strength indicator (RSSI) int16_t RFM69::readRSSI(bool forceTrigger) { int16_t rssi = 0; if (forceTrigger) { // RSSI trigger not needed if DAGC is in continuous mode writeReg(REG_RSSICONFIG, RF_RSSI_START); while ((readReg(REG_RSSICONFIG) & RF_RSSI_DONE) == 0x00); // wait for RSSI_Ready } rssi = -readReg(REG_RSSIVALUE); rssi >>= 1; return rssi; } uint8_t RFM69::readReg(uint8_t addr) { select(); _spi->transfer(addr & 0x7F); uint8_t regval = _spi->transfer(0); unselect(); return regval; } void RFM69::writeReg(uint8_t addr, uint8_t value) { select(); _spi->transfer(addr | 0x80); _spi->transfer(value); unselect(); } // select the RFM69 transceiver (save SPI settings, set CS low) void RFM69::select() { #if defined (SPCR) && defined (SPSR) // save current SPI settings _SPCR = SPCR; _SPSR = SPSR; #endif #ifdef SPI_HAS_TRANSACTION _spi->beginTransaction(_settings); #else // set RFM69 SPI settings explicitly _spi->setDataMode(SPI_MODE0); _spi->setBitOrder(MSBFIRST); #if defined(__STM32F1__) _spi->setClockDivider(SPI_CLOCK_DIV8); #elif defined(__arm__) _spi->setClockDivider(SPI_CLOCK_DIV16); #else _spi->setClockDivider(SPI_CLOCK_DIV2); #endif #endif digitalWrite(_slaveSelectPin, LOW); } // unselect the RFM69 transceiver (set CS high, restore SPI settings) void RFM69::unselect() { digitalWrite(_slaveSelectPin, HIGH); #ifdef SPI_HAS_TRANSACTION _spi->endTransaction(); #endif // restore SPI settings to what they were before talking to RFM69 #if defined (SPCR) && defined (SPSR) SPCR = _SPCR; SPSR = _SPSR; #endif } // true = disable ID filtering to capture all packets on network, regardless of TARGETID // false (default) = enable node/broadcast ID filtering to capture only frames sent to this/broadcast address void RFM69::spyMode(bool onOff) { _spyMode = onOff; //writeReg(REG_PACKETCONFIG1, (readReg(REG_PACKETCONFIG1) & 0xF9) | (onOff ? RF_PACKET1_ADRSFILTERING_OFF : RF_PACKET1_ADRSFILTERING_NODEBROADCAST)); } // for RFM69HW only: you must call setHighPower(true) after initialize() or else transmission won't work void RFM69::setHighPower(bool onOff) { _isRFM69HW = onOff; writeReg(REG_OCP, _isRFM69HW ? RF_OCP_OFF : RF_OCP_ON); if (_isRFM69HW) // turning ON writeReg(REG_PALEVEL, (readReg(REG_PALEVEL) & 0x1F) | RF_PALEVEL_PA1_ON | RF_PALEVEL_PA2_ON); // enable P1 & P2 amplifier stages else writeReg(REG_PALEVEL, RF_PALEVEL_PA0_ON | RF_PALEVEL_PA1_OFF | RF_PALEVEL_PA2_OFF | _powerLevel); // enable P0 only } // internal function void RFM69::setHighPowerRegs(bool onOff) { writeReg(REG_TESTPA1, onOff ? 0x5D : 0x55); writeReg(REG_TESTPA2, onOff ? 0x7C : 0x70); } // set the slave select (CS) pin void RFM69::setCS(uint8_t newSPISlaveSelect) { _slaveSelectPin = newSPISlaveSelect; digitalWrite(_slaveSelectPin, HIGH); pinMode(_slaveSelectPin, OUTPUT); } // set the IRQ pin bool RFM69::setIrq(uint8_t newIRQPin) { uint8_t _newInterruptNum = digitalPinToInterrupt(newIRQPin); if (_newInterruptNum == NOT_AN_INTERRUPT) return false; #ifdef RF69_ATTACHINTERRUPT_TAKES_PIN_NUMBER _newInterruptNum = newIRQPin; #endif // disconnect from existing IRQ pin detachInterrupt( _interruptNum ); _interruptNum = _newInterruptNum; attachInterrupt(_interruptNum, RFM69::isr0, RISING); return true; } //for debugging #define REGISTER_DETAIL 0 #if REGISTER_DETAIL // SERIAL PRINT // replace Serial.print("string") with SerialPrint("string") #define SerialPrint(x) SerialPrint_P(PSTR(x)) void SerialWrite ( uint8_t c ) { Serial.write ( c ); } void SerialPrint_P(PGM_P str, void (*f)(uint8_t) = SerialWrite ) { for (uint8_t c; (c = pgm_read_byte(str)); str++) (*f)(c); } #endif void RFM69::readAllRegs() { uint8_t regVal; #if REGISTER_DETAIL int capVal; //... State Variables for intelligent decoding uint8_t modeFSK = 0; int bitRate = 0; int freqDev = 0; long freqCenter = 0; #endif Serial.println("Address - HEX - BIN"); for (uint8_t regAddr = 1; regAddr <= 0x4F; regAddr++) { select(); _spi->transfer(regAddr & 0x7F); // send address + r/w bit regVal = _spi->transfer(0); unselect(); Serial.print(regAddr, HEX); Serial.print(" - "); Serial.print(regVal,HEX); Serial.print(" - "); Serial.println(regVal,BIN); #if REGISTER_DETAIL switch ( regAddr ) { case 0x1 : { SerialPrint ( "Controls the automatic Sequencer ( see section 4.2 )\nSequencerOff : " ); if ( 0x80 & regVal ) { SerialPrint ( "1 -> Mode is forced by the user\n" ); } else { SerialPrint ( "0 -> Operating mode as selected with Mode bits in RegOpMode is automatically reached with the Sequencer\n" ); } SerialPrint( "\nEnables Listen mode, should be enabled whilst in Standby mode:\nListenOn : " ); if ( 0x40 & regVal ) { SerialPrint ( "1 -> On\n" ); } else { SerialPrint ( "0 -> Off ( see section 4.3)\n" ); } SerialPrint( "\nAborts Listen mode when set together with ListenOn=0 See section 4.3.4 for details (Always reads 0.)\n" ); if ( 0x20 & regVal ) { SerialPrint ( "ERROR - ListenAbort should NEVER return 1 this is a write only register\n" ); } SerialPrint("\nTransceiver's operating modes:\nMode : "); capVal = (regVal >> 2) & 0x7; if ( capVal == 0b000 ) { SerialPrint ( "000 -> Sleep mode (SLEEP)\n" ); } else if ( capVal == 0b001 ) { SerialPrint ( "001 -> Standby mode (STDBY)\n" ); } else if ( capVal == 0b010 ) { SerialPrint ( "010 -> Frequency Synthesizer mode (FS)\n" ); } else if ( capVal == 0b011 ) { SerialPrint ( "011 -> Transmitter mode (TX)\n" ); } else if ( capVal == 0b100 ) { SerialPrint ( "100 -> Receiver Mode (RX)\n" ); } else { Serial.print( capVal, BIN ); SerialPrint ( " -> RESERVED\n" ); } SerialPrint ( "\n" ); break; } case 0x2 : { SerialPrint("Data Processing mode:\nDataMode : "); capVal = (regVal >> 5) & 0x3; if ( capVal == 0b00 ) { SerialPrint ( "00 -> Packet mode\n" ); } else if ( capVal == 0b01 ) { SerialPrint ( "01 -> reserved\n" ); } else if ( capVal == 0b10 ) { SerialPrint ( "10 -> Continuous mode with bit synchronizer\n" ); } else if ( capVal == 0b11 ) { SerialPrint ( "11 -> Continuous mode without bit synchronizer\n" ); } SerialPrint("\nModulation scheme:\nModulation Type : "); capVal = (regVal >> 3) & 0x3; if ( capVal == 0b00 ) { SerialPrint ( "00 -> FSK\n" ); modeFSK = 1; } else if ( capVal == 0b01 ) { SerialPrint ( "01 -> OOK\n" ); } else if ( capVal == 0b10 ) { SerialPrint ( "10 -> reserved\n" ); } else if ( capVal == 0b11 ) { SerialPrint ( "11 -> reserved\n" ); } SerialPrint("\nData shaping: "); if ( modeFSK ) { SerialPrint( "in FSK:\n" ); } else { SerialPrint( "in OOK:\n" ); } SerialPrint ("ModulationShaping : "); capVal = regVal & 0x3; if ( modeFSK ) { if ( capVal == 0b00 ) { SerialPrint ( "00 -> no shaping\n" ); } else if ( capVal == 0b01 ) { SerialPrint ( "01 -> Gaussian filter, BT = 1.0\n" ); } else if ( capVal == 0b10 ) { SerialPrint ( "10 -> Gaussian filter, BT = 0.5\n" ); } else if ( capVal == 0b11 ) { SerialPrint ( "11 -> Gaussian filter, BT = 0.3\n" ); } } else { if ( capVal == 0b00 ) { SerialPrint ( "00 -> no shaping\n" ); } else if ( capVal == 0b01 ) { SerialPrint ( "01 -> filtering with f(cutoff) = BR\n" ); } else if ( capVal == 0b10 ) { SerialPrint ( "10 -> filtering with f(cutoff) = 2*BR\n" ); } else if ( capVal == 0b11 ) { SerialPrint ( "ERROR - 11 is reserved\n" ); } } SerialPrint ( "\n" ); break; } case 0x3 : { bitRate = (regVal << 8); break; } case 0x4 : { bitRate |= regVal; SerialPrint ( "Bit Rate (Chip Rate when Manchester encoding is enabled)\nBitRate : "); unsigned long val = 32UL * 1000UL * 1000UL / bitRate; Serial.println( val ); SerialPrint( "\n" ); break; } case 0x5 : { freqDev = ( (regVal & 0x3f) << 8 ); break; } case 0x6 : { freqDev |= regVal; SerialPrint( "Frequency deviation\nFdev : " ); unsigned long val = RF69_FSTEP * freqDev; Serial.println( val ); SerialPrint ( "\n" ); break; } case 0x7 : { unsigned long tempVal = regVal; freqCenter = ( tempVal << 16 ); break; } case 0x8 : { unsigned long tempVal = regVal; freqCenter = freqCenter | ( tempVal << 8 ); break; } case 0x9 : { freqCenter = freqCenter | regVal; SerialPrint ( "RF Carrier frequency\nFRF : " ); unsigned long val = RF69_FSTEP * freqCenter; Serial.println( val ); SerialPrint( "\n" ); break; } case 0xa : { SerialPrint ( "RC calibration control & status\nRcCalDone : " ); if ( 0x40 & regVal ) { SerialPrint ( "1 -> RC calibration is over\n" ); } else { SerialPrint ( "0 -> RC calibration is in progress\n" ); } SerialPrint ( "\n" ); break; } case 0xb : { SerialPrint ( "Improved AFC routine for signals with modulation index lower than 2. Refer to section 3.4.16 for details\nAfcLowBetaOn : " ); if ( 0x20 & regVal ) { SerialPrint ( "1 -> Improved AFC routine\n" ); } else { SerialPrint ( "0 -> Standard AFC routine\n" ); } SerialPrint ( "\n" ); break; } case 0xc : { SerialPrint ( "Reserved\n\n" ); break; } case 0xd : { byte val; SerialPrint ( "Resolution of Listen mode Idle time (calibrated RC osc):\nListenResolIdle : " ); val = regVal >> 6; if ( val == 0b00 ) { SerialPrint ( "00 -> reserved\n" ); } else if ( val == 0b01 ) { SerialPrint ( "01 -> 64 us\n" ); } else if ( val == 0b10 ) { SerialPrint ( "10 -> 4.1 ms\n" ); } else if ( val == 0b11 ) { SerialPrint ( "11 -> 262 ms\n" ); } SerialPrint ( "\nResolution of Listen mode Rx time (calibrated RC osc):\nListenResolRx : " ); val = (regVal >> 4) & 0x3; if ( val == 0b00 ) { SerialPrint ( "00 -> reserved\n" ); } else if ( val == 0b01 ) { SerialPrint ( "01 -> 64 us\n" ); } else if ( val == 0b10 ) { SerialPrint ( "10 -> 4.1 ms\n" ); } else if ( val == 0b11 ) { SerialPrint ( "11 -> 262 ms\n" ); } SerialPrint ( "\nCriteria for packet acceptance in Listen mode:\nListenCriteria : " ); if ( 0x8 & regVal ) { SerialPrint ( "1 -> signal strength is above RssiThreshold and SyncAddress matched\n" ); } else { SerialPrint ( "0 -> signal strength is above RssiThreshold\n" ); } SerialPrint ( "\nAction taken after acceptance of a packet in Listen mode:\nListenEnd : " ); val = (regVal >> 1 ) & 0x3; if ( val == 0b00 ) { SerialPrint ( "00 -> chip stays in Rx mode. Listen mode stops and must be disabled (see section 4.3)\n" ); } else if ( val == 0b01 ) { SerialPrint ( "01 -> chip stays in Rx mode until PayloadReady or Timeout interrupt occurs. It then goes to the mode defined by Mode. Listen mode stops and must be disabled (see section 4.3)\n" ); } else if ( val == 0b10 ) { SerialPrint ( "10 -> chip stays in Rx mode until PayloadReady or Timeout occurs. Listen mode then resumes in Idle state. FIFO content is lost at next Rx wakeup.\n" ); } else if ( val == 0b11 ) { SerialPrint ( "11 -> Reserved\n" ); } SerialPrint ( "\n" ); break; } default : { } } #endif } unselect(); } void RFM69::readAllRegsCompact() { // Print the header row and first register entry Serial.println();Serial.print(" "); for ( uint8_t reg = 0x00; reg<0x10; reg++ ) { Serial.print(reg, HEX); Serial.print(" "); } Serial.println(); Serial.print("00: -- "); // Loop over the registers from 0x01 to 0x7F and print their values for ( uint8_t reg = 0x01; reg<0x80; reg++ ) { if ( reg % 16 == 0 ) { // Print the header column entries Serial.println(); Serial.print( reg, HEX ); Serial.print(": "); } // Print the actual register values uint8_t ret = readReg( reg ); if ( ret < 0x10 ) Serial.print("0"); // Handle values less than 10 Serial.print( ret, HEX); Serial.print(" "); } } uint8_t RFM69::readTemperature(uint8_t calFactor) // returns centigrade { setMode(RF69_MODE_STANDBY); writeReg(REG_TEMP1, RF_TEMP1_MEAS_START); while ((readReg(REG_TEMP1) & RF_TEMP1_MEAS_RUNNING)); return ~readReg(REG_TEMP2) + COURSE_TEMP_COEF + calFactor; // 'complement' corrects the slope, rising temp = rising val } // COURSE_TEMP_COEF puts reading in the ballpark, user can add additional correction void RFM69::rcCalibration() { writeReg(REG_OSC1, RF_OSC1_RCCAL_START); while ((readReg(REG_OSC1) & RF_OSC1_RCCAL_DONE) == 0x00); } // ListenMode sleep/timer - see ListenModeSleep example for proper usage! void RFM69::listenModeSleep(uint16_t millisInterval) { setMode( RF69_MODE_STANDBY ); while ((readReg(REG_IRQFLAGS1) & RF_IRQFLAGS1_MODEREADY) == 0x00); // wait for ModeReady detachInterrupt( _interruptNum ); //attachInterrupt( _interruptNum, delayIrq, RISING); writeReg( REG_DIOMAPPING1, RF_DIOMAPPING1_DIO0_11 ); writeReg( REG_BITRATEMSB, RF_BITRATEMSB_200000); writeReg( REG_BITRATELSB, RF_BITRATELSB_200000); writeReg( REG_FDEVMSB, RF_FDEVMSB_100000 ); writeReg( REG_FDEVLSB, RF_FDEVLSB_100000 ); writeReg( REG_RXBW, RF_RXBW_DCCFREQ_000 | RF_RXBW_MANT_16 | RF_RXBW_EXP_0 ); uint8_t idleResol; uint32_t divisor; uint32_t microInterval = millisInterval * 1000L; if( microInterval > 255 * 4100L ) { idleResol = RF_LISTEN1_RESOL_IDLE_262000; divisor = 262000; } else if( microInterval > 255 * 64L ) { idleResol = RF_LISTEN1_RESOL_IDLE_4100; divisor = 4100; } else { idleResol = RF_LISTEN1_RESOL_IDLE_64; divisor = 64; } writeReg( REG_LISTEN1, RF_LISTEN1_RESOL_RX_64 | idleResol | RF_LISTEN1_CRITERIA_RSSI | RF_LISTEN1_END_10 ); writeReg( REG_LISTEN2, (microInterval + (divisor >> 1 ) ) / divisor ); writeReg( REG_LISTEN3, 4 ); writeReg( REG_RSSITHRESH, 255 ); writeReg( REG_RXTIMEOUT2, 1 ); writeReg( REG_OPMODE, RF_OPMODE_SEQUENCER_ON | RF_OPMODE_STANDBY ); writeReg( REG_OPMODE, RF_OPMODE_SEQUENCER_ON | RF_OPMODE_STANDBY | RF_OPMODE_LISTEN_ON ); attachInterrupt( _interruptNum, delayIrq, RISING); //must call sleep + interrupt handler 3 times here, then endListenModeSleep() - see ListenModeSleep example! } //============================================================================= // endListenModeSleep() - called by listenModeSleep() //============================================================================= void RFM69::endListenModeSleep() { detachInterrupt( _interruptNum ); writeReg( REG_OPMODE, RF_OPMODE_SEQUENCER_ON | RF_OPMODE_LISTENABORT | RF_OPMODE_STANDBY ); writeReg( REG_OPMODE, RF_OPMODE_SEQUENCER_ON | RF_OPMODE_STANDBY ); writeReg( REG_RXTIMEOUT2, 0 ); setMode( RF69_MODE_STANDBY ); while ((readReg(REG_IRQFLAGS1) & RF_IRQFLAGS1_MODEREADY) == 0x00); // wait for ModeReady } //============================================================================= // delayIRQ() - called by listenModeSleep() //============================================================================= void RFM69::delayIrq() { return; } //============================================================================= // ListenMode specific functions //============================================================================= #if defined(RF69_LISTENMODE_ENABLE) RFM69* RFM69::selfPointer=0; volatile uint16_t RFM69::RF69_LISTEN_BURST_REMAINING_MS = 0; //============================================================================= // reinitRadio() - use base class initialization with saved values //============================================================================= bool RFM69::reinitRadio() { if (!initialize(_freqBand, _address, _networkID)) return false; if (_haveEncryptKey) RFM69::encrypt(_encryptKey); // Restore the encryption key if necessary if (_isHighSpeed) writeReg(REG_LNA, (readReg(REG_LNA) & ~0x3) | RF_LNA_GAINSELECT_AUTO); return true; } static uint32_t getUsForResolution(uint8_t resolution) { switch (resolution) { case RF_LISTEN1_RESOL_RX_64: case RF_LISTEN1_RESOL_IDLE_64: return 64; case RF_LISTEN1_RESOL_RX_4100: case RF_LISTEN1_RESOL_IDLE_4100: return 4100; case RF_LISTEN1_RESOL_RX_262000: case RF_LISTEN1_RESOL_IDLE_262000: return 262000; default: // Whoops return 0; } } static uint32_t getCoefForResolution(uint8_t resolution, uint32_t duration) { uint32_t resolDuration = getUsForResolution(resolution); uint32_t result = duration / resolDuration; // If the next-higher coefficient is closer, use that if (abs(duration - ((result + 1) * resolDuration)) < abs(duration - (result * resolDuration))) return result + 1; return result; } static bool chooseResolutionAndCoef(uint8_t *resolutions, uint32_t duration, uint8_t& resolOut, uint8_t& coefOut) { for (int i = 0; resolutions[i]; i++) { uint32_t coef = getCoefForResolution(resolutions[i], duration); if (coef <= 255) { coefOut = coef; resolOut = resolutions[i]; return true; } } // out of range return false; } bool RFM69::listenModeSetDurations(uint32_t& rxDuration, uint32_t& idleDuration) { uint8_t rxResolutions[] = { RF_LISTEN1_RESOL_RX_64, RF_LISTEN1_RESOL_RX_4100, RF_LISTEN1_RESOL_RX_262000, 0 }; uint8_t idleResolutions[] = { RF_LISTEN1_RESOL_IDLE_64, RF_LISTEN1_RESOL_IDLE_4100, RF_LISTEN1_RESOL_IDLE_262000, 0 }; if (!chooseResolutionAndCoef(rxResolutions, rxDuration, _rxListenResolution, _rxListenCoef)) return false; if (!chooseResolutionAndCoef(idleResolutions, idleDuration, _idleListenResolution, _idleListenCoef)) return false; rxDuration = getUsForResolution(_rxListenResolution) * _rxListenCoef; idleDuration = getUsForResolution(_idleListenResolution) * _idleListenCoef; _listenCycleDurationUs = rxDuration + idleDuration; return true; } void RFM69::listenModeGetDurations(uint32_t &rxDuration, uint32_t &idleDuration) { rxDuration = getUsForResolution(_rxListenResolution) * _rxListenCoef; idleDuration = getUsForResolution(_idleListenResolution) * _idleListenCoef; } void RFM69::listenModeReset(void) { DATALEN = 0; SENDERID = 0; TARGETID = 0; PAYLOADLEN = 0; ACK_REQUESTED = 0; ACK_RECEIVED = 0; RF69_LISTEN_BURST_REMAINING_MS = 0; } //============================================================================= // irq handler, simply calls listenModeInterruptHandler method so internal methods can be accessed easily //============================================================================= ISR_PREFIX void RFM69::listenModeIrq() { selfPointer->listenModeInterruptHandler(); } //============================================================================= // listenModeInterruptHandler() - only called by listen irq handler //============================================================================= void RFM69::listenModeInterruptHandler(void) { if (DATALEN != 0) return; listenModeReset(); noInterrupts(); select(); union // union to simplify addressing of long and short parts of time offset { uint32_t l; uint8_t b[4]; } burstRemaining; burstRemaining.l = 0; _spi->transfer(REG_FIFO & 0x7F); PAYLOADLEN = _spi->transfer(0); PAYLOADLEN = PAYLOADLEN > 64 ? 64 : PAYLOADLEN; // precaution TARGETID = _spi->transfer(0); if(!(_spyMode || TARGETID == _address || TARGETID == RF69_BROADCAST_ADDR) // match this node's address, or broadcast address or anything in spy mode || PAYLOADLEN < 3) // address situation could receive packets that are malformed and don't fit this library's extra fields { listenModeReset(); goto out; } // We've read the target, and will read the sender id and two time offset bytes for a total of 4 bytes DATALEN = PAYLOADLEN - 4; SENDERID = _spi->transfer(0); burstRemaining.b[0] = _spi->transfer(0); // and get the time remaining burstRemaining.b[1] = _spi->transfer(0); RF69_LISTEN_BURST_REMAINING_MS = burstRemaining.l; for (uint8_t i = 0; i < DATALEN; i++) DATA[i] = _spi->transfer(0); if (DATALEN < RF69_MAX_DATA_LEN) DATA[DATALEN] = 0; // add null at end of string out: unselect(); interrupts(); } //============================================================================= // listenModeStart() - switch radio to Listen Mode in prep for sleep until burst //============================================================================= void RFM69::listenModeStart(void) { //pRadio = this; while (readReg(REG_IRQFLAGS2) & RF_IRQFLAGS2_PACKETSENT == 0x00); // wait for ModeReady listenModeReset(); detachInterrupt(_interruptNum); attachInterrupt(_interruptNum, listenModeIrq, RISING); setMode(RF69_MODE_STANDBY); writeReg(REG_DIOMAPPING1, RF_DIOMAPPING1_DIO0_01); writeReg(REG_FRFMSB, readReg(REG_FRFMSB) + 1); writeReg(REG_FRFLSB, readReg(REG_FRFLSB)); // MUST write to LSB to affect change! listenModeApplyHighSpeedSettings(); writeReg(REG_PACKETCONFIG1, RF_PACKET1_FORMAT_VARIABLE | RF_PACKET1_DCFREE_WHITENING | RF_PACKET1_CRC_ON | RF_PACKET1_CRCAUTOCLEAR_ON); writeReg(REG_PACKETCONFIG2, RF_PACKET2_RXRESTARTDELAY_NONE | RF_PACKET2_AUTORXRESTART_ON | RF_PACKET2_AES_OFF); writeReg(REG_SYNCVALUE1, 0x5A); writeReg(REG_SYNCVALUE2, 0x5A); writeReg(REG_LISTEN1, _rxListenResolution | _idleListenResolution | RF_LISTEN1_CRITERIA_RSSI | RF_LISTEN1_END_10); writeReg(REG_LISTEN2, _idleListenCoef); writeReg(REG_LISTEN3, _rxListenCoef); writeReg(REG_RSSITHRESH, 180); writeReg(REG_RXTIMEOUT2, 75); writeReg(REG_OPMODE, RF_OPMODE_SEQUENCER_ON | RF_OPMODE_STANDBY); writeReg(REG_OPMODE, RF_OPMODE_SEQUENCER_ON | RF_OPMODE_LISTEN_ON | RF_OPMODE_STANDBY); } //============================================================================= // listenModeEnd() - exit listen mode and reinit the radio //============================================================================= void RFM69::listenModeEnd(void) { detachInterrupt(_interruptNum); writeReg(REG_OPMODE, RF_OPMODE_SEQUENCER_ON | RF_OPMODE_LISTENABORT | RF_OPMODE_STANDBY); writeReg(REG_OPMODE, RF_OPMODE_SEQUENCER_ON | RF_OPMODE_STANDBY); writeReg(REG_RXTIMEOUT2, 0); setMode(RF69_MODE_STANDBY); while ((readReg(REG_IRQFLAGS1) & RF_IRQFLAGS1_MODEREADY) == 0x00); // wait for ModeReady listenModeReset(); reinitRadio(); } void RFM69::listenModeApplyHighSpeedSettings() { if (!_isHighSpeed) return; writeReg(REG_BITRATEMSB, RF_BITRATEMSB_200000); writeReg(REG_BITRATELSB, RF_BITRATELSB_200000); writeReg(REG_FDEVMSB, RF_FDEVMSB_100000); writeReg(REG_FDEVLSB, RF_FDEVLSB_100000); writeReg( REG_RXBW, RF_RXBW_DCCFREQ_000 | RF_RXBW_MANT_20 | RF_RXBW_EXP_0 ); // Force LNA to the highest gain //writeReg(REG_LNA, (readReg(REG_LNA) << 2) | RF_LNA_GAINSELECT_MAX); } //============================================================================= // sendBurst() - send a burst of packets to a sleeping listening node (or all) //============================================================================= void RFM69::listenModeSendBurst( uint8_t targetNode, const void* buffer, uint8_t size ) { detachInterrupt(_interruptNum); setMode(RF69_MODE_STANDBY); writeReg(REG_PACKETCONFIG1, RF_PACKET1_FORMAT_VARIABLE | RF_PACKET1_DCFREE_WHITENING | RF_PACKET1_CRC_ON | RF_PACKET1_CRCAUTOCLEAR_ON ); writeReg(REG_PACKETCONFIG2, RF_PACKET2_RXRESTARTDELAY_NONE | RF_PACKET2_AUTORXRESTART_ON | RF_PACKET2_AES_OFF); writeReg(REG_SYNCVALUE1, 0x5A); writeReg(REG_SYNCVALUE2, 0x5A); listenModeApplyHighSpeedSettings(); writeReg(REG_FRFMSB, readReg(REG_FRFMSB) + 1); writeReg(REG_FRFLSB, readReg(REG_FRFLSB)); // MUST write to LSB to affect change! union // union to simplify addressing of long and short parts of time offset { int32_t l; uint8_t b[4]; } timeRemaining; uint16_t cycleDurationMs = _listenCycleDurationUs / 1000; timeRemaining.l = cycleDurationMs; #ifdef RF69_WL_DEBUG Serial.print("Sending burst for "); Serial.print(cycleDurationMs, DEC); Serial.println(" ms"); #endif setMode(RF69_MODE_TX); uint32_t numSent = 0; uint32_t startTime = millis(); while(timeRemaining.l > 0) { noInterrupts(); // write to FIFO select(); _spi->transfer(REG_FIFO | 0x80); _spi->transfer(size + 4); // two bytes for target and sender node, two bytes for the burst time remaining _spi->transfer(targetNode); _spi->transfer(_address); // We send the burst time remaining with the packet so the receiver knows how long to wait before trying to reply _spi->transfer(timeRemaining.b[0]); _spi->transfer(timeRemaining.b[1]); for (uint8_t i = 0; i < size; i++) { _spi->transfer(((uint8_t*) buffer)[i]); } unselect(); interrupts(); while ((readReg(REG_IRQFLAGS2) & RF_IRQFLAGS2_FIFONOTEMPTY) != 0x00); // make sure packet is sent before putting more into the FIFO timeRemaining.l = cycleDurationMs - (millis() - startTime); } setMode(RF69_MODE_STANDBY); reinitRadio(); } #endif