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Diffstat (limited to 'aliznayem/RFM69.c')
| -rw-r--r-- | aliznayem/RFM69.c | 539 |
1 files changed, 539 insertions, 0 deletions
diff --git a/aliznayem/RFM69.c b/aliznayem/RFM69.c new file mode 100644 index 0000000..d92a21b --- /dev/null +++ b/aliznayem/RFM69.c @@ -0,0 +1,539 @@ +// ********************************************************************************** +// Driver definition for HopeRF RFM69W/RFM69HW/RFM69CW/RFM69HCW, Semtech SX1231/1231H +// ********************************************************************************** +// Copyright Felix Rusu 2016, http://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 +// ********************************************************************************** + + +// ********************************************************************************** +// Converted to AVR environment by Zulkar Nayem +// ********************************************************************************** + + +#include <avr/io.h> +#include <avr/interrupt.h> +#include "spi.h" +#include "RFM69registers.h" +#include "RFM69.h" +#include "get_millis.h" + +volatile uint8_t DATALEN; +volatile uint8_t SENDERID; +volatile uint8_t TARGETID; // should match _address +volatile uint8_t PAYLOADLEN; +volatile uint8_t ACK_REQUESTED; +volatile uint8_t ACK_RECEIVED; // should be polled immediately after sending a packet with ACK request +volatile int16_t RSSI; // most accurate RSSI during reception (closest to the reception) +volatile uint8_t mode = RF69_MODE_STANDBY; // should be protected? +volatile uint8_t inISR = 0; +uint8_t isRFM69HW = 1; // if RFM69HW model matches high power enable possible +uint8_t address; //nodeID +uint8_t powerLevel = 31; +uint8_t promiscuousMode = 0; +unsigned long millis_current; + +// freqBand must be selected from 315, 433, 868, 915 +void rfm69_init(uint16_t freqBand, uint8_t nodeID, uint8_t networkID) +{ + 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, RF_FRFMSB_433}, + //* 0x08 */ { REG_FRFMID, RF_FRFMID_433}, + //* 0x09 */ { REG_FRFLSB, RF_FRFLSB_433}, + + /* 0x07 */ { REG_FRFMSB, (uint8_t) (freqBand==RF_315MHZ ? RF_FRFMSB_315 : (freqBand==RF_433MHZ ? RF_FRFMSB_433 : (freqBand==RF_868MHZ ? RF_FRFMSB_868 : RF_FRFMSB_915))) }, + /* 0x08 */ { REG_FRFMID, (uint8_t) (freqBand==RF_315MHZ ? RF_FRFMID_315 : (freqBand==RF_433MHZ ? RF_FRFMID_433 : (freqBand==RF_868MHZ ? RF_FRFMID_868 : RF_FRFMID_915))) }, + /* 0x09 */ { REG_FRFLSB, (uint8_t) (freqBand==RF_315MHZ ? RF_FRFLSB_315 : (freqBand==RF_433MHZ ? RF_FRFLSB_433 : (freqBand==RF_868MHZ ? RF_FRFLSB_868 : RF_FRFLSB_915))) }, + + + // looks like PA1 and PA2 are not implemented on RFM69W, 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 + /* 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} + }; + + spi_init(); // spi initialize + //DDRC |= 1<<PC6; // temporary for testing LED output + SS_DDR |= 1<<SS_PIN; // setting SS as output + SS_PORT |= 1<<SS_PIN; // setting slave select high + INT_DDR &= ~(1<<INT_PIN_n); // setting interrupt pin input. no problem if not given + INT_PORT &= ~(1<<INT_PIN_n); // setting pull down. because rising will cause interrupt. external pull down is needed. + + while (readReg(REG_SYNCVALUE1) != 0xaa) + { + writeReg(REG_SYNCVALUE1, 0xaa); + } + + while (readReg(REG_SYNCVALUE1) != 0x55) + { + writeReg(REG_SYNCVALUE1, 0x55); + } + + 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); + while ((readReg(REG_IRQFLAGS1) & RF_IRQFLAGS1_MODEREADY) == 0x00); + + EICRn |= (1<<ISCn1)|(1<<ISCn0); // setting INTn rising. details datasheet p91. must change with interrupt pin. + EIMSK |= 1<<INTn; // enable INTn + inISR = 0; + //sei(); //not needed because sei() called in millis_init() :) + millis_init(); // to get miliseconds + + address = nodeID; + setAddress(address); // setting this node id + setNetwork(networkID); +} + +// set this node's address +void setAddress(uint8_t addr) +{ + writeReg(REG_NODEADRS, addr); +} + +// set network address +void setNetwork(uint8_t networkID) +{ + writeReg(REG_SYNCVALUE2, networkID); +} + +uint8_t canSend() +{ + if (mode == RF69_MODE_RX && PAYLOADLEN == 0 && readRSSI(0) < CSMA_LIMIT) // if signal stronger than -100dBm is detected assume channel activity + { + setMode(RF69_MODE_STANDBY); + return 1; + } + return 0; +} + +// Transmit data +void send(uint8_t toAddress, const void* buffer, uint8_t bufferSize, uint8_t requestACK) +{ + writeReg(REG_PACKETCONFIG2, (readReg(REG_PACKETCONFIG2) & 0xFB) | RF_PACKET2_RXRESTART); // avoid RX deadlocks + millis_current = millis(); + while (!canSend() && millis() - millis_current < RF69_CSMA_LIMIT_MS) receiveDone(); + sendFrame(toAddress, buffer, bufferSize, requestACK, 0); +} + +// check whether an ACK was requested in the last received packet (non-broadcasted packet) +uint8_t ACKRequested() +{ + return ACK_REQUESTED && (TARGETID != RF69_BROADCAST_ADDR); +} + +// should be called immediately after reception in case sender wants ACK +void 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 + uint8_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 + millis_current = millis(); + while (!canSend() && millis() - millis_current < RF69_CSMA_LIMIT_MS) receiveDone(); + SENDERID = sender; // TWS: Restore SenderID after it gets wiped out by receiveDone() n.b. actually now there is no receiveDone() :D + sendFrame(sender, buffer, bufferSize, 0, 1); + RSSI = _RSSI; // restore payload RSSI +} + +// 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 setPowerLevel(uint8_t powerLevel) +{ + uint8_t _powerLevel = powerLevel; + if (isRFM69HW==1) _powerLevel /= 2; + writeReg(REG_PALEVEL, (readReg(REG_PALEVEL) & 0xE0) | _powerLevel); +} + +//put transceiver in sleep mode to save battery - to wake or resume receiving just call receiveDone() +void sleep() +{ + setMode(RF69_MODE_SLEEP); +} + +uint8_t 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 + +// return the frequency (in Hz) +uint32_t 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 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); +} + +// Read byte from register +uint8_t readReg(uint8_t addr) +{ + select(); + spi_fast_shift(addr & 0x7F); + uint8_t regval = spi_fast_shift(0); + unselect(); + return regval; +} + +// Write byte to register +void writeReg(uint8_t addr, uint8_t value) +{ + select(); + spi_fast_shift(addr | 0x80); + spi_fast_shift(value); + unselect(); +} + +// To enable encryption: radio.encrypt("ABCDEFGHIJKLMNOP"); +// To disable encryption: encrypt(null) or encrypt(0) +// KEY HAS TO BE 16 bytes !!! +void encrypt(const char* key) +{ + setMode(RF69_MODE_STANDBY); + if (key != 0) + { + select(); + spi_fast_shift(REG_AESKEY1 | 0x80); + for (uint8_t i = 0; i < 16; i++) + spi_fast_shift(key[i]); + unselect(); + } + writeReg(REG_PACKETCONFIG2, (readReg(REG_PACKETCONFIG2) & 0xFE) | (key ? 1:0)); +} + +void 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(1); + break; + case RF69_MODE_RX: + writeReg(REG_OPMODE, (readReg(REG_OPMODE) & 0xE3) | RF_OPMODE_RECEIVER); + if (isRFM69HW) setHighPowerRegs(0); + 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; +} + +// internal function +void setHighPowerRegs(uint8_t onOff) +{ + if(onOff==1) + { + writeReg(REG_TESTPA1, 0x5D); + writeReg(REG_TESTPA2, 0x7C); + } + else + { + writeReg(REG_TESTPA1, 0x55); + writeReg(REG_TESTPA2, 0x70); + } +} + +// for RFM69HW only: you must call setHighPower(1) after rfm69_init() or else transmission won't work +void setHighPower(uint8_t onOff) +{ + isRFM69HW = onOff; + writeReg(REG_OCP, isRFM69HW ? RF_OCP_OFF : RF_OCP_ON); + + if (isRFM69HW == 1) // 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 +} + +// get the received signal strength indicator (RSSI) +int16_t readRSSI(uint8_t forceTrigger) +{ + int16_t rssi = 0; + if (forceTrigger==1) + { + // 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; +} + +// internal function +void sendFrame(uint8_t toAddress, const void* buffer, uint8_t bufferSize, uint8_t requestACK, uint8_t sendACK) +{ + 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==1) + CTLbyte = RFM69_CTL_SENDACK; + else if (requestACK==1) + 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(); //enable data transfer + spi_fast_shift(REG_FIFO | 0x80); + spi_fast_shift(bufferSize + 3); + spi_fast_shift(toAddress); + spi_fast_shift(address); + spi_fast_shift(CTLbyte); + + for (uint8_t i = 0; i < bufferSize; i++) + spi_fast_shift(((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); + //millis_current = millis(); + //_delay_ms(500); + // wait for DIO to high + // for PINE5 + //while (bit_is_clear(INT_PIN, INT_pin_num) && millis() - millis_current < RF69_TX_LIMIT_MS); + while ((readReg(REG_IRQFLAGS2) & RF_IRQFLAGS2_PACKETSENT) == 0x00); // wait for PacketSent + setMode(RF69_MODE_STANDBY); +} + +// Calibrate RC +void rcCalibration() +{ + writeReg(REG_OSC1, RF_OSC1_RCCAL_START); + while ((readReg(REG_OSC1) & RF_OSC1_RCCAL_DONE) == 0x00); +} + +uint8_t sendWithRetry(uint8_t toAddress, const void* buffer, uint8_t bufferSize, uint8_t retries, uint8_t retryWaitTime) +{ + for (uint8_t i = 0; i <= retries; i++) + { + send(toAddress, buffer, bufferSize, 1); + millis_current = millis(); + while (millis() - millis_current < retryWaitTime) + { + if (ACKReceived(toAddress)) + { + return 1; + } + } + } + return 0; +} + +// should be polled immediately after sending a packet with ACK request +uint8_t ACKReceived(uint8_t fromNodeID) +{ + if (receiveDone()) + return (SENDERID == fromNodeID || fromNodeID == RF69_BROADCAST_ADDR) && ACK_RECEIVED; + return 0; +} + +// checks if a packet was received and/or puts transceiver in receive (ie RX or listen) mode +uint8_t receiveDone() +{ + cli(); + + if (mode == RF69_MODE_RX && PAYLOADLEN > 0) + { + setMode(RF69_MODE_STANDBY); // enables interrupts + return 1; + } + else if (mode == RF69_MODE_RX) // already in RX no payload yet + { + sei(); // explicitly re-enable interrupts + return 0; + } + receiveBegin(); + sei(); + return 0; +} + +// internal function +void receiveBegin() +{ + DATALEN = 0; + SENDERID = 0; + TARGETID = 0; + PAYLOADLEN = 0; + ACK_REQUESTED = 0; + ACK_RECEIVED = 0; + 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); +} + +// 1 = disable filtering to capture all frames on network +// 0 = enable node/broadcast filtering to capture only frames sent to this/broadcast address +void promiscuous(uint8_t onOff) +{ + promiscuousMode = onOff; + if(promiscuousMode==0) + writeReg(REG_PACKETCONFIG1, (readReg(REG_PACKETCONFIG1) & 0xF9) | RF_PACKET1_ADRSFILTERING_NODEBROADCAST); + else + writeReg(REG_PACKETCONFIG1, (readReg(REG_PACKETCONFIG1) & 0xF9) | RF_PACKET1_ADRSFILTERING_OFF); +} + +// Only reenable interrupts if we're not being called from the ISR +void maybeInterrupts() +{ + if (!inISR) sei(); +} + +// Enable SPI transfer +void select() +{ + SS_PORT &= ~(1<<SS_PIN); + cli(); +} + +// Disable SPI transfer +void unselect() +{ + SS_PORT |= 1<<SS_PIN; + maybeInterrupts(); +} + +// Interrupt Service Routine +ISR(INT_VECT) +{ + inISR = 1; + if (mode == RF69_MODE_RX && (readReg(REG_IRQFLAGS2) & RF_IRQFLAGS2_PAYLOADREADY)) + { + setMode(RF69_MODE_STANDBY); + select(); + spi_fast_shift(REG_FIFO & 0x7F); + PAYLOADLEN = spi_fast_shift(0); + if(PAYLOADLEN>66) PAYLOADLEN=66; + TARGETID = spi_fast_shift(0); + if(!(promiscuousMode || TARGETID == address || TARGETID == RF69_BROADCAST_ADDR) // match this node's address, or broadcast address or anything in promiscuous 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; + SENDERID = spi_fast_shift(0); + uint8_t CTLbyte = spi_fast_shift(0); + + 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_fast_shift(0); + } + if (DATALEN < RF69_MAX_DATA_LEN) DATA[DATALEN] = 0; // add null at end of string + unselect(); + setMode(RF69_MODE_RX); + } + RSSI = readRSSI(0); + inISR = 0; +} |