text: #if !defined(_RADIOLIB_RF69_H)
  #define _RADIOLIB_RF69_H
  
  #include "../../TypeDef.h"
  
  #if !defined(RADIOLIB_EXCLUDE_RF69)
  
  #include "../../Module.h"
  
  #include "../../protocols/PhysicalLayer/PhysicalLayer.h"
  
  // RF69 physical layer properties
  #define RF69_FREQUENCY_STEP_SIZE                      61.03515625
  #define RF69_MAX_PACKET_LENGTH                        64
  #define RF69_CRYSTAL_FREQ                             32.0
  #define RF69_DIV_EXPONENT                             19
  
  // RF69 register map
  #define RF69_REG_FIFO                                 0x00
  #define RF69_REG_OP_MODE                              0x01
  #define RF69_REG_DATA_MODUL                           0x02
  #define RF69_REG_BITRATE_MSB                          0x03
  #define RF69_REG_BITRATE_LSB                          0x04
  #define RF69_REG_FDEV_MSB                             0x05
  #define RF69_REG_FDEV_LSB                             0x06
  #define RF69_REG_FRF_MSB                              0x07
  #define RF69_REG_FRF_MID                              0x08
  #define RF69_REG_FRF_LSB                              0x09
  #define RF69_REG_OSC_1                                0x0A
  #define RF69_REG_AFC_CTRL                             0x0B
  #define RF69_REG_LISTEN_1                             0x0D
  #define RF69_REG_LISTEN_2                             0x0E
  #define RF69_REG_LISTEN_3                             0x0F
  #define RF69_REG_VERSION                              0x10
  #define RF69_REG_PA_LEVEL                             0x11
  #define RF69_REG_PA_RAMP                              0x12
  #define RF69_REG_OCP                                  0x13
  #define RF69_REG_LNA                                  0x18
  #define RF69_REG_RX_BW                                0x19
  #define RF69_REG_AFC_BW                               0x1A
  #define RF69_REG_OOK_PEAK                             0x1B
  #define RF69_REG_OOK_AVG                              0x1C
  #define RF69_REG_OOK_FIX                              0x1D
  #define RF69_REG_AFC_FEI                              0x1E
  #define RF69_REG_AFC_MSB                              0x1F
  #define RF69_REG_AFC_LSB                              0x20
  #define RF69_REG_FEI_MSB                              0x21
  #define RF69_REG_FEI_LSB                              0x22
  #define RF69_REG_RSSI_CONFIG                          0x23
  #define RF69_REG_RSSI_VALUE                           0x24
  #define RF69_REG_DIO_MAPPING_1                        0x25
  #define RF69_REG_DIO_MAPPING_2                        0x26
  #define RF69_REG_IRQ_FLAGS_1                          0x27
  #define RF69_REG_IRQ_FLAGS_2                          0x28
  #define RF69_REG_RSSI_THRESH                          0x29
  #define RF69_REG_RX_TIMEOUT_1                         0x2A
  #define RF69_REG_RX_TIMEOUT_2                         0x2B
  #define RF69_REG_PREAMBLE_MSB                         0x2C
  #define RF69_REG_PREAMBLE_LSB                         0x2D
  #define RF69_REG_SYNC_CONFIG                          0x2E
  #define RF69_REG_SYNC_VALUE_1                         0x2F
  #define RF69_REG_SYNC_VALUE_2                         0x30
  #define RF69_REG_SYNC_VALUE_3                         0x31
  #define RF69_REG_SYNC_VALUE_4                         0x32
  #define RF69_REG_SYNC_VALUE_5                         0x33
  #define RF69_REG_SYNC_VALUE_6                         0x34
  #define RF69_REG_SYNC_VALUE_7                         0x35
  #define RF69_REG_SYNC_VALUE_8                         0x36
  #define RF69_REG_PACKET_CONFIG_1                      0x37
  #define RF69_REG_PAYLOAD_LENGTH                       0x38
  #define RF69_REG_NODE_ADRS                            0x39
  #define RF69_REG_BROADCAST_ADRS                       0x3A
  #define RF69_REG_AUTO_MODES                           0x3B
  #define RF69_REG_FIFO_THRESH                          0x3C
  #define RF69_REG_PACKET_CONFIG_2                      0x3D
  #define RF69_REG_AES_KEY_1                            0x3E
  #define RF69_REG_AES_KEY_2                            0x3F
  #define RF69_REG_AES_KEY_3                            0x40
  #define RF69_REG_AES_KEY_4                            0x41
  #define RF69_REG_AES_KEY_5                            0x42
  #define RF69_REG_AES_KEY_6                            0x43
  #define RF69_REG_AES_KEY_7                            0x44
  #define RF69_REG_AES_KEY_8                            0x45
  #define RF69_REG_AES_KEY_9                            0x46
  #define RF69_REG_AES_KEY_10                           0x47
  #define RF69_REG_AES_KEY_11                           0x48
  #define RF69_REG_AES_KEY_12                           0x49
  #define RF69_REG_AES_KEY_13                           0x4A
  #define RF69_REG_AES_KEY_14                           0x4B
  #define RF69_REG_AES_KEY_15                           0x4C
  #define RF69_REG_AES_KEY_16                           0x4D
  #define RF69_REG_TEMP_1                               0x4E
  #define RF69_REG_TEMP_2                               0x4F
  #define RF69_REG_TEST_LNA                             0x58
  #define RF69_REG_TEST_PA1                             0x5A
  #define RF69_REG_TEST_PA2                             0x5C
  #define RF69_REG_TEST_DAGC                            0x6F
  
  // RF69 modem settings
  // RF69_REG_OP_MODE                                                   MSB   LSB   DESCRIPTION
  #define RF69_SEQUENCER_OFF                            0b00000000  //  7     7     disable automatic sequencer
  #define RF69_SEQUENCER_ON                             0b10000000  //  7     7     enable automatic sequencer
  #define RF69_LISTEN_OFF                               0b00000000  //  6     6     disable Listen mode
  #define RF69_LISTEN_ON                                0b01000000  //  6     6     enable Listen mode
  #define RF69_LISTEN_ABORT                             0b00100000  //  5     5     abort Listen mode (has to be set together with RF69_LISTEN_OFF)
  #define RF69_SLEEP                                    0b00000000  //  4     2     sleep
  #define RF69_STANDBY                                  0b00000100  //  4     2     standby
  #define RF69_FS                                       0b00001000  //  4     2     frequency synthesis
  #define RF69_TX                                       0b00001100  //  4     2     transmit
  #define RF69_RX                                       0b00010000  //  4     2     receive
  
  // RF69_REG_DATA_MODUL
  #define RF69_PACKET_MODE                              0b00000000  //  6     5     packet mode (default)
  #define RF69_CONTINUOUS_MODE_WITH_SYNC                0b01000000  //  6     5     continuous mode with bit synchronizer
  #define RF69_CONTINUOUS_MODE                          0b01100000  //  6     5     continuous mode without bit synchronizer
  #define RF69_FSK                                      0b00000000  //  4     3     modulation: FSK (default)
  #define RF69_OOK                                      0b00001000  //  4     3                 OOK
  #define RF69_NO_SHAPING                               0b00000000  //  1     0     modulation shaping: no shaping (default)
  #define RF69_FSK_GAUSSIAN_1_0                         0b00000001  //  1     0                         FSK modulation Gaussian filter, BT = 1.0
  #define RF69_FSK_GAUSSIAN_0_5                         0b00000010  //  1     0                         FSK modulation Gaussian filter, BT = 0.5
  #define RF69_FSK_GAUSSIAN_0_3                         0b00000011  //  1     0                         FSK modulation Gaussian filter, BT = 0.3
  #define RF69_OOK_FILTER_BR                            0b00000001  //  1     0                         OOK modulation filter, f_cutoff = BR
  #define RF69_OOK_FILTER_2BR                           0b00000010  //  1     0                         OOK modulation filter, f_cutoff = 2*BR
  
  // RF69_REG_BITRATE_MSB + REG_BITRATE_LSB
  #define RF69_BITRATE_MSB                              0x1A        //  7     0     bit rate setting: rate = F(XOSC) / BITRATE
  #define RF69_BITRATE_LSB                              0x0B        //  7     0         default value: 4.8 kbps                            0x40        //  7     0
  
  // RF69_REG_FDEV_MSB + REG_FDEV_LSB
  #define RF69_FDEV_MSB                                 0x00        //  5     0     frequency deviation: f_dev = f_step * FDEV
  #define RF69_FDEV_LSB                                 0x52        //  7     0         default value: 5 kHz
  
  // RF69_REG_FRF_MSB + REG_FRF_MID + REG_FRF_LSB
  #define RF69_FRF_MSB                                  0xE4        //  7     0     carrier frequency setting: f_RF = (F(XOSC) * FRF)/2^19
  #define RF69_FRF_MID                                  0xC0        //  7     0         where F(XOSC) = 32 MHz
  #define RF69_FRF_LSB                                  0x00        //  7     0         default value: 915 MHz
  
  // RF69_REG_OSC_1
  #define RF69_RC_CAL_START                             0b10000000  //  7     7     force RC oscillator calibration
  #define RF69_RC_CAL_RUNNING                           0b00000000  //  6     6     RC oscillator calibration is still running
  #define RF69_RC_CAL_DONE                              0b00000000  //  5     5     RC oscillator calibration has finished
  
  // RF69_REG_AFC_CTRL
  #define RF69_AFC_LOW_BETA_OFF                         0b00000000  //  5     5     standard AFC routine
  #define RF69_AFC_LOW_BETA_ON                          0b00100000  //  5     5     improved AFC routine for signals with modulation index less than 2
  
  // RF69_REG_LISTEN_1
  #define RF69_LISTEN_RES_IDLE_64_US                    0b01000000  //  7     6     resolution of Listen mode idle time: 64 us
  #define RF69_LISTEN_RES_IDLE_4_1_MS                   0b10000000  //  7     6                                          4.1 ms (default)
  #define RF69_LISTEN_RES_IDLE_262_MS                   0b11000000  //  7     6                                          262 ms
  #define RF69_LISTEN_RES_RX_64_US                      0b00010000  //  5     4     resolution of Listen mode rx time: 64 us (default)
  #define RF69_LISTEN_RES_RX_4_1_MS                     0b00100000  //  5     4                                        4.1 ms
  #define RF69_LISTEN_RES_RX_262_MS                     0b00110000  //  5     4                                        262 ms
  #define RF69_LISTEN_ACCEPT_ABOVE_RSSI_THRESH          0b00000000  //  3     3     packet acceptance criteria: RSSI above threshold
  #define RF69_LISTEN_ACCEPT_MATCH_SYNC_ADDRESS         0b00001000  //  3     3                                 RSSI above threshold AND sync address matched
  #define RF69_LISTEN_END_KEEP_RX                       0b00000000  //  2     1     action after packet acceptance: stay in Rx mode
  #define RF69_LISTEN_END_KEEP_RX_TIMEOUT               0b00000010  //  2     1                                     stay in Rx mode until timeout (default)
  #define RF69_LISTEN_END_KEEP_RX_TIMEOUT_RESUME        0b00000100  //  2     1                                     stay in Rx mode until timeout, Listen mode will resume
  
  // RF69_REG_LISTEN_2
  #define RF69_LISTEN_COEF_IDLE                         0xF5        //  7     0     duration of idle phase in Listen mode
  
  // RF69_REG_LISTEN_3
  #define RF69_LISTEN_COEF_RX                           0x20        //  7     0     duration of Rx phase in Listen mode
  
  // RF69_REG_VERSION
  #define RF69_CHIP_VERSION                             0x24        //  7     0
  
  // RF69_REG_PA_LEVEL
  #define RF69_PA0_OFF                                  0b00000000  //  7     7     PA0 disabled
  #define RF69_PA0_ON                                   0b10000000  //  7     7     PA0 enabled (default)
  #define RF69_PA1_OFF                                  0b00000000  //  6     6     PA1 disabled (default)
  #define RF69_PA1_ON                                   0b01000000  //  6     6     PA1 enabled
  #define RF69_PA2_OFF                                  0b00000000  //  5     5     PA2 disabled (default)
  #define RF69_PA2_ON                                   0b00100000  //  5     5     PA2 enabled
  #define RF69_OUTPUT_POWER                             0b00011111  //  4     0     output power: P_out = -18 + OUTPUT_POWER
  
  // RF69_REG_PA_RAMP
  #define RF69_PA_RAMP_3_4_MS                           0b00000000  //  3     0     PA ramp rise/fall time: 3.4 ms
  #define RF69_PA_RAMP_2_MS                             0b00000001  //  3     0                             2 ms
  #define RF69_PA_RAMP_1_MS                             0b00000010  //  3     0                             1 ms
  #define RF69_PA_RAMP_500_US                           0b00000011  //  3     0                             500 us
  #define RF69_PA_RAMP_250_US                           0b00000100  //  3     0                             250 us
  #define RF69_PA_RAMP_125_US                           0b00000101  //  3     0                             125 us
  #define RF69_PA_RAMP_100_US                           0b00000110  //  3     0                             100 us
  #define RF69_PA_RAMP_62_US                            0b00000111  //  3     0                             62 us
  #define RF69_PA_RAMP_50_US                            0b00001000  //  3     0                             50 us
  #define RF69_PA_RAMP_40_US                            0b00001001  //  3     0                             40 us (default)
  #define RF69_PA_RAMP_31_US                            0b00001010  //  3     0                             31 us
  #define RF69_PA_RAMP_25_US                            0b00001011  //  3     0                             25 us
  #define RF69_PA_RAMP_20_US                            0b00001100  //  3     0                             20 us
  #define RF69_PA_RAMP_15_US                            0b00001101  //  3     0                             15 us
  #define RF69_PA_RAMP_12_US                            0b00001110  //  3     0                             12 us
  #define RF69_PA_RAMP_10_US                            0b00001111  //  3     0                             10 us
  
  // RF69_REG_OCP
  #define RF69_OCP_OFF                                  0b00000000  //  4     4     PA overload current protection disabled
  #define RF69_OCP_ON                                   0b00010000  //  4     4     PA overload current protection enabled
  #define RF69_OCP_TRIM                                 0b00001010  //  3     0     OCP current: I_max(OCP_TRIM = 0b1010) = 95 mA
  
  // RF69_REG_LNA
  #define RF69_LNA_Z_IN_50_OHM                          0b00000000  //  7     7     LNA input impedance: 50 ohm
  #define RF69_LNA_Z_IN_200_OHM                         0b10000000  //  7     7                          200 ohm
  #define RF69_LNA_CURRENT_GAIN                         0b00001000  //  5     3     manually set LNA current gain
  #define RF69_LNA_GAIN_AUTO                            0b00000000  //  2     0     LNA gain setting: set automatically by AGC
  #define RF69_LNA_GAIN_MAX                             0b00000001  //  2     0                       max gain
  #define RF69_LNA_GAIN_MAX_6_DB                        0b00000010  //  2     0                       max gain - 6 dB
  #define RF69_LNA_GAIN_MAX_12_DB                       0b00000011  //  2     0                       max gain - 12 dB
  #define RF69_LNA_GAIN_MAX_24_DB                       0b00000100  //  2     0                       max gain - 24 dB
  #define RF69_LNA_GAIN_MAX_36_DB                       0b00000101  //  2     0                       max gain - 36 dB
  #define RF69_LNA_GAIN_MAX_48_DB                       0b00000110  //  2     0                       max gain - 48 dB
  
  // RF69_REG_RX_BW
  #define RF69_DCC_FREQ                                 0b01000000  //  7     5     DC offset canceller cutoff frequency (4% Rx BW by default)
  #define RF69_RX_BW_MANT_16                            0b00000000  //  4     3     Channel filter bandwidth FSK: RxBw = F(XOSC)/(RxBwMant * 2^(RxBwExp + 2))
  #define RF69_RX_BW_MANT_20                            0b00001000  //  4     3                              OOK: RxBw = F(XOSC)/(RxBwMant * 2^(RxBwExp + 3))
  #define RF69_RX_BW_MANT_24                            0b00010000  //  4     3
  #define RF69_RX_BW_EXP                                0b00000101  //  2     0     default RxBwExp value = 5
  
  // RF69_REG_AFC_BW
  #define RF69_DCC_FREQ_AFC                             0b10000000  //  7     5     default DccFreq parameter for AFC
  #define RF69_DCC_RX_BW_MANT_AFC                       0b00001000  //  4     3     default RxBwMant parameter for AFC
  #define RF69_DCC_RX_BW_EXP_AFC                        0b00000011  //  2     0     default RxBwExp parameter for AFC
  
  // RF69_REG_OOK_PEAK
  #define RF69_OOK_THRESH_FIXED                         0b00000000  //  7     6     OOK threshold type: fixed
  #define RF69_OOK_THRESH_PEAK                          0b01000000  //  7     6                         peak (default)
  #define RF69_OOK_THRESH_AVERAGE                       0b10000000  //  7     6                         average
  #define RF69_OOK_PEAK_THRESH_STEP_0_5_DB              0b00000000  //  5     3     OOK demodulator step size: 0.5 dB (default)
  #define RF69_OOK_PEAK_THRESH_STEP_1_0_DB              0b00001000  //  5     3                                1.0 dB
  #define RF69_OOK_PEAK_THRESH_STEP_1_5_DB              0b00010000  //  5     3                                1.5 dB
  #define RF69_OOK_PEAK_THRESH_STEP_2_0_DB              0b00011000  //  5     3                                2.0 dB
  #define RF69_OOK_PEAK_THRESH_STEP_3_0_DB              0b00100000  //  5     3                                3.0 dB
  #define RF69_OOK_PEAK_THRESH_STEP_4_0_DB              0b00101000  //  5     3                                4.0 dB
  #define RF69_OOK_PEAK_THRESH_STEP_5_0_DB              0b00110000  //  5     3                                5.0 dB
  #define RF69_OOK_PEAK_THRESH_STEP_6_0_DB              0b00111000  //  5     3                                6.0 dB
  #define RF69_OOK_PEAK_THRESH_DEC_1_1_CHIP             0b00000000  //  2     0     OOK demodulator step period: once per chip (default)
  #define RF69_OOK_PEAK_THRESH_DEC_1_2_CHIP             0b00000001  //  2     0                                  once every 2 chips
  #define RF69_OOK_PEAK_THRESH_DEC_1_4_CHIP             0b00000010  //  2     0                                  once every 4 chips
  #define RF69_OOK_PEAK_THRESH_DEC_1_8_CHIP             0b00000011  //  2     0                                  once every 8 chips
  #define RF69_OOK_PEAK_THRESH_DEC_2_1_CHIP             0b00000100  //  2     0                                  2 times per chip
  #define RF69_OOK_PEAK_THRESH_DEC_4_1_CHIP             0b00000101  //  2     0                                  4 times per chip
  #define RF69_OOK_PEAK_THRESH_DEC_8_1_CHIP             0b00000110  //  2     0                                  8 times per chip
  #define RF69_OOK_PEAK_THRESH_DEC_16_1_CHIP            0b00000111  //  2     0                                  16 times per chip
  
  // RF69_REG_OOK_AVG
  #define RF69_OOK_AVG_THRESH_FILT_32_PI                0b00000000  //  7     6     OOK average filter coefficient: chip rate / 32*pi
  #define RF69_OOK_AVG_THRESH_FILT_8_PI                 0b01000000  //  7     6                                     chip rate / 8*pi
  #define RF69_OOK_AVG_THRESH_FILT_4_PI                 0b10000000  //  7     6                                     chip rate / 4*pi (default)
  #define RF69_OOK_AVG_THRESH_FILT_2_PI                 0b11000000  //  7     6                                     chip rate / 2*pi
  
  // RF69_REG_OOK_FIX
  #define RF69_OOK_FIXED_THRESH                         0b00000110  //  7     0     default OOK fixed threshold (6 dB)
  
  // RF69_REG_AFC_FEI
  #define RF69_FEI_RUNNING                              0b00000000  //  6     6     FEI status: on-going
  #define RF69_FEI_DONE                                 0b01000000  //  6     6                 done
  #define RF69_FEI_START                                0b00100000  //  5     5     force new FEI measurement
  #define RF69_AFC_RUNNING                              0b00000000  //  4     4     AFC status: on-going
  #define RF69_AFC_DONE                                 0b00010000  //  4     4                 done
  #define RF69_AFC_AUTOCLEAR_OFF                        0b00000000  //  3     3     AFC register autoclear disabled
  #define RF69_AFC_AUTOCLEAR_ON                         0b00001000  //  3     3     AFC register autoclear enabled
  #define RF69_AFC_AUTO_OFF                             0b00000000  //  2     2     perform AFC only manually
  #define RF69_AFC_AUTO_ON                              0b00000100  //  2     2     perform AFC each time Rx mode is started
  #define RF69_AFC_CLEAR                                0b00000010  //  1     1     clear AFC register
  #define RF69_AFC_START                                0b00000001  //  0     0     start AFC
  
  // RF69_REG_RSSI_CONFIG
  #define RF69_RSSI_RUNNING                             0b00000000  //  1     1     RSSI status: on-going
  #define RF69_RSSI_DONE                                0b00000010  //  1     1                  done
  #define RF69_RSSI_START                               0b00000001  //  0     0     start RSSI measurement
  
  // RF69_REG_DIO_MAPPING_1
  #define RF69_DIO0_CONT_MODE_READY                     0b11000000  //  7     6
  #define RF69_DIO0_CONT_PLL_LOCK                       0b00000000  //  7     6
  #define RF69_DIO0_CONT_SYNC_ADDRESS                   0b00000000  //  7     6
  #define RF69_DIO0_CONT_TIMEOUT                        0b01000000  //  7     6
  #define RF69_DIO0_CONT_RSSI                           0b10000000  //  7     6
  #define RF69_DIO0_CONT_TX_READY                       0b01000000  //  7     6
  #define RF69_DIO0_PACK_PLL_LOCK                       0b11000000  //  7     6
  #define RF69_DIO0_PACK_CRC_OK                         0b00000000  //  7     6
  #define RF69_DIO0_PACK_PAYLOAD_READY                  0b01000000  //  7     6
  #define RF69_DIO0_PACK_SYNC_ADDRESS                   0b10000000  //  7     6
  #define RF69_DIO0_PACK_RSSI                           0b11000000  //  7     6
  #define RF69_DIO0_PACK_PACKET_SENT                    0b00000000  //  7     6
  #define RF69_DIO0_PACK_TX_READY                       0b01000000  //  7     6
  #define RF69_DIO1_CONT_PLL_LOCK                       0b00110000  //  5     4
  #define RF69_DIO1_CONT_DCLK                           0b00000000  //  5     4
  #define RF69_DIO1_CONT_RX_READY                       0b00010000  //  5     4
  #define RF69_DIO1_CONT_SYNC_ADDRESS                   0b00110000  //  5     4
  #define RF69_DIO1_CONT_TX_READY                       0b00010000  //  5     4
  #define RF69_DIO1_PACK_FIFO_LEVEL                     0b00000000  //  5     4
  #define RF69_DIO1_PACK_FIFO_FULL                      0b00010000  //  5     4
  #define RF69_DIO1_PACK_FIFO_NOT_EMPTY                 0b00100000  //  5     4
  #define RF69_DIO1_PACK_PLL_LOCK                       0b00110000  //  5     4
  #define RF69_DIO1_PACK_TIMEOUT                        0b00110000  //  5     4
  #define RF69_DIO2_CONT_DATA                           0b00000000  //  3     2
  
  // RF69_REG_DIO_MAPPING_2
  #define RF69_CLK_OUT_FXOSC                            0b00000000  //  2     0     ClkOut frequency: F(XOSC)
  #define RF69_CLK_OUT_FXOSC_2                          0b00000001  //  2     0                       F(XOSC) / 2
  #define RF69_CLK_OUT_FXOSC_4                          0b00000010  //  2     0                       F(XOSC) / 4
  #define RF69_CLK_OUT_FXOSC_8                          0b00000011  //  2     0                       F(XOSC) / 8
  #define RF69_CLK_OUT_FXOSC_16                         0b00000100  //  2     0                       F(XOSC) / 16
  #define RF69_CLK_OUT_FXOSC_32                         0b00000101  //  2     0                       F(XOSC) / 31
  #define RF69_CLK_OUT_RC                               0b00000110  //  2     0                       RC
  #define RF69_CLK_OUT_OFF                              0b00000111  //  2     0                       disabled (default)
  
  // RF69_REG_IRQ_FLAGS_1
  #define RF69_IRQ_MODE_READY                           0b10000000  //  7     7     requested mode was set
  #define RF69_IRQ_RX_READY                             0b01000000  //  6     6     Rx mode ready
  #define RF69_IRQ_TX_READY                             0b00100000  //  5     5     Tx mode ready
  #define RF69_IRQ_PLL_LOCK                             0b00010000  //  4     4     PLL is locked
  #define RF69_IRQ_RSSI                                 0b00001000  //  3     3     RSSI value exceeded RssiThreshold
  #define RF69_IRQ_TIMEOUT                              0b00000100  //  2     2     timeout occurred
  #define RF69_IRQ_AUTO_MODE                            0b00000010  //  1     1     entered intermediate mode
  #define RF69_SYNC_ADDRESS_MATCH                       0b00000001  //  0     0     sync address detected
  
  // RF69_REG_IRQ_FLAGS_2
  #define RF69_IRQ_FIFO_FULL                            0b10000000  //  7     7     FIFO is full
  #define RF69_IRQ_FIFO_NOT_EMPTY                       0b01000000  //  6     6     FIFO contains at least 1 byte
  #define RF69_IRQ_FIFO_LEVEL                           0b00100000  //  5     5     FIFO contains more than FifoThreshold bytes
  #define RF69_IRQ_FIFO_OVERRUN                         0b00010000  //  4     4     FIFO overrun occurred
  #define RF69_IRQ_PACKET_SENT                          0b00001000  //  3     3     packet was sent
  #define RF69_IRQ_PAYLOAD_READY                        0b00000100  //  2     2     last payload byte received and CRC check passed
  #define RF69_IRQ_CRC_OK                               0b00000010  //  1     1     CRC check passed
  
  // RF69_REG_RSSI_THRESH
  #define RF69_RSSI_THRESHOLD                           0xE4        //  7     0     RSSI threshold level (2 dB by default)
  
  // RF69_REG_RX_TIMEOUT_1
  #define RF69_TIMEOUT_RX_START_OFF                     0x00        //  7     0     RSSI interrupt timeout disabled (default)
  #define RF69_TIMEOUT_RX_START                         0xFF        //  7     0     timeout will occur if RSSI interrupt is not received
  
  // RF69_REG_RX_TIMEOUT_2
  #define RF69_TIMEOUT_RSSI_THRESH_OFF                  0x00        //  7     0     PayloadReady interrupt timeout disabled (default)
  #define RF69_TIMEOUT_RSSI_THRESH                      0xFF        //  7     0     timeout will occur if PayloadReady interrupt is not received
  
  // RF69_REG_PREAMBLE_MSB + REG_PREAMBLE_MSB
  #define RF69_PREAMBLE_MSB                             0x00        //  7     0     2-byte preamble size value
  #define RF69_PREAMBLE_LSB                             0x03        //  7     0
  
  // RF69_REG_SYNC_CONFIG
  #define RF69_SYNC_OFF                                 0b00000000  //  7     7     sync word detection off
  #define RF69_SYNC_ON                                  0b10000000  //  7     7     sync word detection on (default)
  #define RF69_FIFO_FILL_CONDITION_SYNC                 0b00000000  //  6     6     FIFO fill condition: on SyncAddress interrupt (default)
  #define RF69_FIFO_FILL_CONDITION                      0b01000000  //  6     6                          as long as the bit is set
  #define RF69_SYNC_SIZE                                0b00001000  //  5     3     size of sync word: SyncSize + 1 bytes
  #define RF69_SYNC_TOL                                 0b00000000  //  2     0     number of tolerated errors in sync word
  
  // RF69_REG_SYNC_VALUE_1 - SYNC_VALUE_8
  #define RF69_SYNC_BYTE_1                              0x01        //  7     0     sync word: 1st byte (MSB)
  #define RF69_SYNC_BYTE_2                              0x01        //  7     0                2nd byte
  #define RF69_SYNC_BYTE_3                              0x01        //  7     0                3rd byte
  #define RF69_SYNC_BYTE_4                              0x01        //  7     0                4th byte
  #define RF69_SYNC_BYTE_5                              0x01        //  7     0                5th byte
  #define RF69_SYNC_BYTE_6                              0x01        //  7     0                6th byte
  #define RF69_SYNC_BYTE_7                              0x01        //  7     0                7th byte
  #define RF69_SYNC_BYTE_8                              0x01        //  7     0                8th byte (LSB)
  
  // RF69_REG_PACKET_CONFIG_1
  #define RF69_PACKET_FORMAT_FIXED                      0b00000000  //  7     7     fixed packet length (default)
  #define RF69_PACKET_FORMAT_VARIABLE                   0b10000000  //  7     7     variable packet length
  #define RF69_DC_FREE_NONE                             0b00000000  //  6     5     DC-free encoding: none (default)
  #define RF69_DC_FREE_MANCHESTER                       0b00100000  //  6     5                       Manchester
  #define RF69_DC_FREE_WHITENING                        0b01000000  //  6     5                       Whitening
  #define RF69_CRC_OFF                                  0b00000000  //  4     4     CRC disabled
  #define RF69_CRC_ON                                   0b00010000  //  4     4     CRC enabled (default)
  #define RF69_CRC_AUTOCLEAR_ON                         0b00000000  //  3     3     discard packet when CRC check fails (default)
  #define RF69_CRC_AUTOCLEAR_OFF                        0b00001000  //  3     3     keep packet when CRC check fails
  #define RF69_ADDRESS_FILTERING_OFF                    0b00000000  //  2     1     address filtering: none (default)
  #define RF69_ADDRESS_FILTERING_NODE                   0b00000010  //  2     1                        node
  #define RF69_ADDRESS_FILTERING_NODE_BROADCAST         0b00000100  //  2     1                        node or broadcast
  
  // RF69_REG_PAYLOAD_LENGTH
  #define RF69_PAYLOAD_LENGTH                           0xFF        //  7     0     payload length
  
  // RF69_REG_AUTO_MODES
  #define RF69_ENTER_COND_NONE                          0b00000000  //  7     5     condition for entering intermediate mode: none, AutoModes disabled (default)
  #define RF69_ENTER_COND_FIFO_NOT_EMPTY                0b00100000  //  7     5                                               FifoNotEmpty rising edge
  #define RF69_ENTER_COND_FIFO_LEVEL                    0b01000000  //  7     5                                               FifoLevel rising edge
  #define RF69_ENTER_COND_CRC_OK                        0b01100000  //  7     5                                               CrcOk rising edge
  #define RF69_ENTER_COND_PAYLOAD_READY                 0b10000000  //  7     5                                               PayloadReady rising edge
  #define RF69_ENTER_COND_SYNC_ADDRESS                  0b10100000  //  7     5                                               SyncAddress rising edge
  #define RF69_ENTER_COND_PACKET_SENT                   0b11000000  //  7     5                                               PacketSent rising edge
  #define RF69_ENTER_COND_FIFO_EMPTY                    0b11100000  //  7     5                                               FifoNotEmpty falling edge
  #define RF69_EXIT_COND_NONE                           0b00000000  //  4     2     condition for exiting intermediate mode: none, AutoModes disabled (default)
  #define RF69_EXIT_COND_FIFO_EMPTY                     0b00100000  //  4     2                                              FifoNotEmpty falling edge
  #define RF69_EXIT_COND_FIFO_LEVEL                     0b01000000  //  4     2                                              FifoLevel rising edge
  #define RF69_EXIT_COND_CRC_OK                         0b01100000  //  4     2                                              CrcOk rising edge
  #define RF69_EXIT_COND_PAYLOAD_READY                  0b10000000  //  4     2                                              PayloadReady rising edge
  #define RF69_EXIT_COND_SYNC_ADDRESS                   0b10100000  //  4     2                                              SyncAddress rising edge
  #define RF69_EXIT_COND_PACKET_SENT                    0b11000000  //  4     2                                              PacketSent rising edge
  #define RF69_EXIT_COND_TIMEOUT                        0b11100000  //  4     2                                              timeout rising edge
  #define RF69_INTER_MODE_SLEEP                         0b00000000  //  1     0     intermediate mode: sleep (default)
  #define RF69_INTER_MODE_STANDBY                       0b00000001  //  1     0                        standby
  #define RF69_INTER_MODE_RX                            0b00000010  //  1     0                        Rx
  #define RF69_INTER_MODE_TX                            0b00000011  //  1     0                        Tx
  
  // RF69_REG_FIFO_THRESH
  #define RF69_TX_START_CONDITION_FIFO_LEVEL            0b00000000  //  7     7     packet transmission start condition: FifoLevel
  #define RF69_TX_START_CONDITION_FIFO_NOT_EMPTY        0b10000000  //  7     7                                          FifoNotEmpty (default)
  #define RF69_FIFO_THRESHOLD                           0b00001111  //  6     0     default threshold to trigger FifoLevel interrupt
  
  // RF69_REG_PACKET_CONFIG_2
  #define RF69_INTER_PACKET_RX_DELAY                    0b00000000  //  7     4     delay between FIFO empty and start of new RSSI phase
  #define RF69_RESTART_RX                               0b00000100  //  2     2     force receiver into wait mode
  #define RF69_AUTO_RX_RESTART_OFF                      0b00000000  //  1     1     auto Rx restart disabled
  #define RF69_AUTO_RX_RESTART_ON                       0b00000010  //  1     1     auto Rx restart enabled (default)
  #define RF69_AES_OFF                                  0b00000000  //  0     0     AES encryption disabled (default)
  #define RF69_AES_ON                                   0b00000001  //  0     0     AES encryption enabled, payload size limited to 66 bytes
  
  // RF69_REG_TEST_LNA
  #define RF69_TEST_LNA_BOOST_NORMAL                    0x1B        //  7     0
  #define RF69_TEST_LNA_BOOST_HIGH                      0x2D        //  7     0
  
  // RF69_REG_TEMP_1
  #define RF69_TEMP_MEAS_START                          0b00001000  //  3     3     trigger temperature measurement
  #define RF69_TEMP_MEAS_RUNNING                        0b00000100  //  2     2     temperature measurement status: on-going
  #define RF69_TEMP_MEAS_DONE                           0b00000000  //  2     2                                     done
  
  // RF69_REG_TEST_DAGC
  #define RF69_CONTINUOUS_DAGC_NORMAL                   0x00        //  7     0     fading margin improvement:  normal mode
  #define RF69_CONTINUOUS_DAGC_LOW_BETA_ON              0x20        //  7     0                                 improved mode for AfcLowBetaOn
  #define RF69_CONTINUOUS_DAGC_LOW_BETA_OFF             0x30        //  7     0                                 improved mode for AfcLowBetaOff (default)
  
  // RF69_REG_TEST_PA1
  #define RF69_PA1_NORMAL                               0x55        //  7     0     PA_BOOST: none
  #define RF69_PA1_20_DBM                               0x5D        //  7     0               +20 dBm
  
  // RF69_REG_TEST_PA2
  #define RF69_PA2_NORMAL                               0x70        //  7     0     PA_BOOST: none
  #define RF69_PA2_20_DBM                               0x7C        //  7     0               +20 dBm
  
  /*!
    \class RF69
  
    \brief Control class for %RF69 module. Also serves as base class for SX1231.
  */
  class RF69: public PhysicalLayer {
    public:
      // introduce PhysicalLayer overloads
      using PhysicalLayer::transmit;
      using PhysicalLayer::receive;
      using PhysicalLayer::startTransmit;
      using PhysicalLayer::readData;
  
      /*!
        \brief Default constructor.
  
        \param mod Instance of Module that will be used to communicate with the radio.
      */
      RF69(Module* module);
  
      // basic methods
  
      /*!
        \brief Initialization method.
  
        \param freq Carrier frequency in MHz. Defaults to 434.0 MHz.
  
        \param br Bit rate to be used in kbps. Defaults to 48.0 kbps.
  
        \param freqDev Frequency deviation from carrier frequency in kHz Defaults to 50.0 kHz.
  
        \param rxBw Receiver bandwidth in kHz. Defaults to 125.0 kHz.
  
        \param power Output power in dBm. Defaults to 10 dBm.
  
        \param preambleLen Preamble Length in bits. Defaults to 16 bits.
  
        \returns \ref status_codes
      */
      int16_t begin(float freq = 434.0, float br = 48.0, float freqDev = 50.0, float rxBw = 125.0, int8_t power = 10, uint8_t preambleLen = 16);
  
      /*!
        \brief Reset method. Will reset the chip to the default state using RST pin.
      */
      void reset();
  
      /*!
        \brief Blocking binary transmit method.
        Overloads for string-based transmissions are implemented in PhysicalLayer.
  
        \param data Binary data to be sent.
  
        \param len Number of bytes to send.
  
        \param addr Address to send the data to. Will only be added if address filtering was enabled.
  
        \returns \ref status_codes
      */
      int16_t transmit(uint8_t* data, size_t len, uint8_t addr = 0) override;
  
      /*!
        \brief Blocking binary receive method.
        Overloads for string-based transmissions are implemented in PhysicalLayer.
  
        \param data Binary data to be sent.
  
        \param len Number of bytes to send.
  
        \returns \ref status_codes
      */
      int16_t receive(uint8_t* data, size_t len) override;
  
      /*!
        \brief Sets the module to sleep mode.
  
        \returns \ref status_codes
      */
      int16_t sleep();
  
      /*!
        \brief Sets the module to standby mode.
  
        \returns \ref status_codes
      */
      int16_t standby() override;
  
      /*!
        \brief Starts direct mode transmission.
  
        \param frf Raw RF frequency value. Defaults to 0, required for quick frequency shifts in RTTY.
  
        \returns \ref status_codes
      */
      int16_t transmitDirect(uint32_t frf = 0) override;
  
      /*!
        \brief Starts direct mode reception.
  
        \returns \ref status_codes
      */
      int16_t receiveDirect() override;
  
      /*!
        \brief Stops direct mode. It is required to call this method to switch from direct transmissions to packet-based transmissions.
      */
      int16_t packetMode();
  
      // hardware AES support
  
      /*!
        \brief Sets AES key.
  
        \param Key to be used for AES encryption. Must be exactly 16 bytes long.
      */
      void setAESKey(uint8_t* key);
  
      /*!
        \brief Enables AES encryption.
  
        \returns \ref status_codes
      */
      int16_t enableAES();
  
      /*!
        \brief Disables AES encryption.
  
        \returns \ref status_codes
      */
      int16_t disableAES();
  
      // interrupt methods
  
      /*!
        \brief Sets interrupt service routine to call when DIO0 activates.
  
        \param func ISR to call.
      */
      void setDio0Action(void (*func)(void));
  
      /*!
        \brief Clears interrupt service routine to call when DIO0 activates.
      */
      void clearDio0Action();
  
      /*!
        \brief Sets interrupt service routine to call when DIO1 activates.
  
        \param func ISR to call.
      */
      void setDio1Action(void (*func)(void));
  
      /*!
        \brief Clears interrupt service routine to call when DIO1 activates.
      */
      void clearDio1Action();
  
      /*!
        \brief Interrupt-driven binary transmit method.
        Overloads for string-based transmissions are implemented in PhysicalLayer.
  
        \param data Binary data to be sent.
  
        \param len Number of bytes to send.
  
        \param addr Address to send the data to. Will only be added if address filtering was enabled.
  
        \returns \ref status_codes
      */
      int16_t startTransmit(uint8_t* data, size_t len, uint8_t addr = 0) override;
  
      /*!
        \brief Interrupt-driven receive method. GDO0 will be activated when full packet is received.
  
        \returns \ref status_codes
      */
      int16_t startReceive();
  
      /*!
        \brief Reads data received after calling startReceive method.
  
        \param data Pointer to array to save the received binary data.
  
        \param len Number of bytes that will be received. Must be known in advance for binary transmissions.
  
        \returns \ref status_codes
      */
      int16_t readData(uint8_t* data, size_t len) override;
  
      // configuration methods
  
      /*!
        \brief Sets carrier frequency. Allowed values are in bands 290.0 to 340.0 MHz, 431.0 to 510.0 MHz and 862.0 to 1020.0 MHz.
  
        \param freq Carrier frequency to be set in MHz.
  
        \returns \ref status_codes
      */
      int16_t setFrequency(float freq);
  
      /*!
        \brief Sets bit rate. Allowed values range from 1.2 to 300.0 kbps.
  
        \param br Bit rate to be set in kbps.
  
        \returns \ref status_codes
      */
      int16_t setBitRate(float br);
  
      /*!
        \brief Sets receiver bandwidth. Allowed values are 2.6, 3.1, 3.9, 5.2, 6.3, 7.8, 10.4, 12.5, 15.6, 20.8, 25.0, 31.3, 41.7, 50.0, 62.5, 83.3, 100.0, 125.0, 166.7, 200.0, 250.0, 333.3, 400.0 and 500.0 kHz.
  
        \param rxBw Receiver bandwidth to be set in kHz.
  
        \returns \ref status_codes
      */
      int16_t setRxBandwidth(float rxBw);
  
      /*!
        \brief Sets frequency deviation.
  
        \param freqDev Frequency deviation to be set in kHz.
  
        \returns \ref status_codes
      */
      int16_t setFrequencyDeviation(float freqDev) override;
  
      /*!
        \brief Sets output power. Allowed values range from -18 to 13 dBm for low power modules (RF69C/CW) or -2 to 20 dBm (RF69H/HC/HCW).
  
        \param power Output power to be set in dBm.
  
        \param highPower Set to true when using modules high power port (RF69H/HC/HCW). Defaults to false (models without high power port - RF69C/CW).
  
        \returns \ref status_codes
      */
      int16_t setOutputPower(int8_t power, bool highPower = false);
  
      /*!
        \brief Sets sync word. Up to 8 bytes can be set as sync word.
  
        \param syncWord Pointer to the array of sync word bytes.
  
        \param len Sync word length in bytes.
  
        \param maxErrBits Maximum allowed number of bit errors in received sync word. Defaults to 0.
      */
      int16_t setSyncWord(uint8_t* syncWord, size_t len, uint8_t maxErrBits = 0);
  
      /*!
        \brief Sets preamble length.
  
        \param preambleLen Preamble length to be set (in bits), allowed values: 16, 24, 32, 48, 64, 96, 128 and 192.
  
        \returns \ref status_codes
      */
      int16_t setPreambleLength(uint8_t preambleLen);
  
      /*!
        \brief Sets node address. Calling this method will also enable address filtering for node address only.
  
        \param nodeAddr Node address to be set.
  
        \returns \ref status_codes
      */
      int16_t setNodeAddress(uint8_t nodeAddr);
  
      /*!
        \brief Sets broadcast address. Calling this method will also enable address filtering for node and broadcast address.
  
        \param broadAddr Node address to be set.
  
        \returns \ref status_codes
      */
      int16_t setBroadcastAddress(uint8_t broadAddr);
  
      /*!
        \brief Disables address filtering. Calling this method will also erase previously set addresses.
  
        \returns \ref status_codes
      */
      int16_t disableAddressFiltering();
  
      // measurement methods
  
      /*!
        \brief Sets ambient temperature. Required to correct values from on-board temperature sensor.
  
        \param tempAmbient Ambient temperature in degrees Celsius.
      */
      void setAmbientTemperature(int16_t tempAmbient);
  
      /*!
        \brief Measures temperature.
  
        \returns Measured temperature in degrees Celsius.
      */
      int16_t getTemperature();
  
      /*!
        \brief Query modem for the packet length of received payload.
  
        \param update Update received packet length. Will return cached value when set to false.
  
        \returns Length of last received packet in bytes.
      */
      size_t getPacketLength(bool update = true) override;
  
      /*!
        \brief Enables/disables OOK modulation instead of FSK.
  
        \param enableOOK Enable (true) or disable (false) OOK.
  
        \returns \ref status_codes
      */
      int16_t setOOK(bool enableOOK);
  
      /*!
        \brief Selects the type of threshold in the OOK data slicer
  
        \param type Threshold type: RF69_OOK_THRESH_PEAK(default), RF69_OOK_THRESH_FIXED or RF69_OOK_THRESH_AVERAGE
  
        \returns \ref status_codes
      */
      int16_t setOokThresholdType(uint8_t type);
  
      /*!
        \brief Set modem in fixed packet length mode.
  
        \param len Packet length.
  
        \returns \ref status_codes
      */
      int16_t fixedPacketLengthMode(uint8_t len = RF69_MAX_PACKET_LENGTH);
  
       /*!
        \brief Set modem in variable packet length mode.
  
        \param len Maximum packet length.
  
        \returns \ref status_codes
      */
      int16_t variablePacketLengthMode(uint8_t maxLen = RF69_MAX_PACKET_LENGTH);
  
       /*!
        \brief Enable sync word filtering and generation.
  
        \param numBits Sync word length in bits.
  
        \returns \ref status_codes
      */
      int16_t enableSyncWordFiltering(uint8_t maxErrBits = 0);
  
       /*!
        \brief Disable preamble and sync word filtering and generation.
  
        \returns \ref status_codes
      */
      int16_t disableSyncWordFiltering();
  
       /*!
        \brief Enable CRC filtering and generation.
  
        \param crcOn Set or unset CRC filtering.
  
        \returns \ref status_codes
      */
      int16_t setCrcFiltering(bool crcOn = true);
  
       /*!
        \brief Set modem in "sniff" mode: no packet filtering (e.g., no preamble, sync word, address, CRC).
  
        \param promiscuous Set or unset promiscuous mode.
  
        \returns \ref status_codes
      */
      int16_t setPromiscuousMode(bool promiscuous = true);
  
      /*!
        \brief Sets Gaussian filter bandwidth-time product that will be used for data shaping.
        Allowed values are RADIOLIB_SHAPING_0_3, RADIOLIB_SHAPING_0_5 or RADIOLIB_SHAPING_1_0. Set to RADIOLIB_SHAPING_NONE to disable data shaping.
  
        \param sh Gaussian shaping bandwidth-time product that will be used for data shaping
  
        \returns \ref status_codes
      */
      int16_t setDataShaping(uint8_t sh) override;
  
      /*!
        \brief Sets transmission encoding.
         Allowed values are RADIOLIB_ENCODING_NRZ, RADIOLIB_ENCODING_MANCHESTER and RADIOLIB_ENCODING_WHITENING.
  
        \param encoding Encoding to be used.
  
        \returns \ref status_codes
      */
      int16_t setEncoding(uint8_t encoding) override;
  
      /*!
      \brief Enable/disable LNA Boost mode (disabled by default).
  
      \param value True to enable, false to disable.
  
      \returns \ref status_codes
      */
      int16_t setLnaTestBoost(bool value);
  
      /*!
        \brief Gets RSSI (Recorded Signal Strength Indicator) of the last received packet.
  
        \returns Last packet RSSI in dBm.
      */
      float getRSSI();
  
      /*!
        \brief Some modules contain external RF switch controlled by two pins. This function gives RadioLib control over those two pins to automatically switch Rx and Tx state.
        When using automatic RF switch control, DO NOT change the pin mode of rxEn or txEn from Arduino sketch!
  
        \param rxEn RX enable pin.
  
        \param txEn TX enable pin.
      */
      void setRfSwitchPins(RADIOLIB_PIN_TYPE rxEn, RADIOLIB_PIN_TYPE txEn);
  
      /*!
       \brief Get one truly random byte from RSSI noise.
  
       \returns TRNG byte.
     */
      uint8_t random();
  
      /*!
       \brief Read version SPI register. Should return RF69_CHIP_VERSION (0x24) if SX127x is connected and working.
  
       \returns Version register contents or \ref status_codes
     */
      int16_t getChipVersion();
  
      /*!
        \brief Set interrupt service routine function to call when data bit is receveid in direct mode.
  
        \param func Pointer to interrupt service routine.
      */
      void setDirectAction(void (*func)(void));
  
      /*!
        \brief Function to read and process data bit in direct reception mode.
  
        \param pin Pin on which to read.
      */
      void readBit(RADIOLIB_PIN_TYPE pin);
  
  #if !defined(RADIOLIB_GODMODE) && !defined(RADIOLIB_LOW_LEVEL)
    protected:
  #endif
      Module* _mod;
  
  #if !defined(RADIOLIB_GODMODE)
    protected:
  #endif
  
      float _freq = 0;
      float _br = 0;
      float _rxBw = 0;
      bool _ook = false;
      int16_t _tempOffset = 0;
      int8_t _power = 0;
  
      size_t _packetLength = 0;
      bool _packetLengthQueried = false;
      uint8_t _packetLengthConfig = RF69_PACKET_FORMAT_VARIABLE;
  
      bool _promiscuous = false;
  
      uint8_t _syncWordLength = 2;
  
      int16_t config();
      int16_t directMode();
      int16_t setPacketMode(uint8_t mode, uint8_t len);
  
  #if !defined(RADIOLIB_GODMODE)
    private:
  #endif
      int16_t setMode(uint8_t mode);
      void clearIRQFlags();
  };
  
  #endif
  
  #endif
  