diff options
Diffstat (limited to 'aliznayem/RFM69.c')
| -rw-r--r-- | aliznayem/RFM69.c | 539 |
1 files changed, 0 insertions, 539 deletions
diff --git a/aliznayem/RFM69.c b/aliznayem/RFM69.c deleted file mode 100644 index d92a21b..0000000 --- a/aliznayem/RFM69.c +++ /dev/null @@ -1,539 +0,0 @@ -// ********************************************************************************** -// 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; -} |