#if !defined(_RADIOLIB_NRF24_H) && !RADIOLIB_EXCLUDE_NRF24
#define _RADIOLIB_NRF24_H

#include "../../Module.h"
#include "../../TypeDef.h"

#include "../../protocols/PhysicalLayer/PhysicalLayer.h"

// nRF24 physical layer properties
#define RADIOLIB_NRF24_FREQUENCY_STEP_SIZE                      1000000.0
#define RADIOLIB_NRF24_MAX_PACKET_LENGTH                        32

// nRF24 SPI commands
#define RADIOLIB_NRF24_CMD_READ                                 0b00000000
#define RADIOLIB_NRF24_CMD_WRITE                                0b00100000
#define RADIOLIB_NRF24_CMD_READ_RX_PAYLOAD                      0b01100001
#define RADIOLIB_NRF24_CMD_WRITE_TX_PAYLOAD                     0b10100000
#define RADIOLIB_NRF24_CMD_FLUSH_TX                             0b11100001
#define RADIOLIB_NRF24_CMD_FLUSH_RX                             0b11100010
#define RADIOLIB_NRF24_CMD_REUSE_TX_PAXLOAD                     0b11100011
#define RADIOLIB_NRF24_CMD_READ_RX_PAYLOAD_WIDTH                0b01100000
#define RADIOLIB_NRF24_CMD_WRITE_ACK_PAYLOAD                    0b10101000
#define RADIOLIB_NRF24_CMD_WRITE_TX_PAYLOAD_NOACK               0b10110000
#define RADIOLIB_NRF24_CMD_NOP                                  0b11111111

// nRF24 register map
#define RADIOLIB_NRF24_REG_CONFIG                               0x00
#define RADIOLIB_NRF24_REG_EN_AA                                0x01
#define RADIOLIB_NRF24_REG_EN_RXADDR                            0x02
#define RADIOLIB_NRF24_REG_SETUP_AW                             0x03
#define RADIOLIB_NRF24_REG_SETUP_RETR                           0x04
#define RADIOLIB_NRF24_REG_RF_CH                                0x05
#define RADIOLIB_NRF24_REG_RF_SETUP                             0x06
#define RADIOLIB_NRF24_REG_STATUS                               0x07
#define RADIOLIB_NRF24_REG_OBSERVE_TX                           0x08
#define RADIOLIB_NRF24_REG_RPD                                  0x09
#define RADIOLIB_NRF24_REG_RX_ADDR_P0                           0x0A
#define RADIOLIB_NRF24_REG_RX_ADDR_P1                           0x0B
#define RADIOLIB_NRF24_REG_RX_ADDR_P2                           0x0C
#define RADIOLIB_NRF24_REG_RX_ADDR_P3                           0x0D
#define RADIOLIB_NRF24_REG_RX_ADDR_P4                           0x0E
#define RADIOLIB_NRF24_REG_RX_ADDR_P5                           0x0F
#define RADIOLIB_NRF24_REG_TX_ADDR                              0x10
#define RADIOLIB_NRF24_REG_RX_PW_P0                             0x11
#define RADIOLIB_NRF24_REG_RX_PW_P1                             0x12
#define RADIOLIB_NRF24_REG_RX_PW_P2                             0x13
#define RADIOLIB_NRF24_REG_RX_PW_P3                             0x14
#define RADIOLIB_NRF24_REG_RX_PW_P4                             0x15
#define RADIOLIB_NRF24_REG_RX_PW_P5                             0x16
#define RADIOLIB_NRF24_REG_FIFO_STATUS                          0x17
#define RADIOLIB_NRF24_REG_DYNPD                                0x1C
#define RADIOLIB_NRF24_REG_FEATURE                              0x1D

// RADIOLIB_NRF24_REG_CONFIG                                                  MSB   LSB   DESCRIPTION
#define RADIOLIB_NRF24_MASK_RX_DR_IRQ_OFF                       0b01000000  //  6     6   RX_DR will not be reflected on IRQ pin
#define RADIOLIB_NRF24_MASK_RX_DR_IRQ_ON                        0b00000000  //  6     6   RX_DR will be reflected on IRQ pin as active low (default)
#define RADIOLIB_NRF24_MASK_TX_DS_IRQ_OFF                       0b00100000  //  5     5   TX_DS will not be reflected on IRQ pin
#define RADIOLIB_NRF24_MASK_TX_DS_IRQ_ON                        0b00000000  //  5     5   TX_DS will be reflected on IRQ pin as active low (default)
#define RADIOLIB_NRF24_MASK_MAX_RT_IRQ_OFF                      0b00010000  //  4     4   MAX_RT will not be reflected on IRQ pin
#define RADIOLIB_NRF24_MASK_MAX_RT_IRQ_ON                       0b00000000  //  4     4   MAX_RT will be reflected on IRQ pin as active low (default)
#define RADIOLIB_NRF24_CRC_OFF                                  0b00000000  //  3     3   CRC calculation: disabled
#define RADIOLIB_NRF24_CRC_ON                                   0b00001000  //  3     3                    enabled (default)
#define RADIOLIB_NRF24_CRC_8                                    0b00000000  //  2     2   CRC scheme: CRC8 (default)
#define RADIOLIB_NRF24_CRC_16                                   0b00000100  //  2     2               CRC16
#define RADIOLIB_NRF24_POWER_UP                                 0b00000010  //  1     1   power up
#define RADIOLIB_NRF24_POWER_DOWN                               0b00000000  //  1     1   power down
#define RADIOLIB_NRF24_PTX                                      0b00000000  //  0     0   enable primary Tx
#define RADIOLIB_NRF24_PRX                                      0b00000001  //  0     0   enable primary Rx

// RADIOLIB_NRF24_REG_EN_AA
#define RADIOLIB_NRF24_AA_ALL_OFF                               0b00000000  //  5     0   auto-ACK on all pipes: disabled
#define RADIOLIB_NRF24_AA_ALL_ON                                0b00111111  //  5     0                          enabled (default)
#define RADIOLIB_NRF24_AA_P5_OFF                                0b00000000  //  5     5   auto-ACK on pipe 5: disabled
#define RADIOLIB_NRF24_AA_P5_ON                                 0b00100000  //  5     5                       enabled (default)
#define RADIOLIB_NRF24_AA_P4_OFF                                0b00000000  //  4     4   auto-ACK on pipe 4: disabled
#define RADIOLIB_NRF24_AA_P4_ON                                 0b00010000  //  4     4                       enabled (default)
#define RADIOLIB_NRF24_AA_P3_OFF                                0b00000000  //  3     3   auto-ACK on pipe 3: disabled
#define RADIOLIB_NRF24_AA_P3_ON                                 0b00001000  //  3     3                       enabled (default)
#define RADIOLIB_NRF24_AA_P2_OFF                                0b00000000  //  2     2   auto-ACK on pipe 2: disabled
#define RADIOLIB_NRF24_AA_P2_ON                                 0b00000100  //  2     2                       enabled (default)
#define RADIOLIB_NRF24_AA_P1_OFF                                0b00000000  //  1     1   auto-ACK on pipe 1: disabled
#define RADIOLIB_NRF24_AA_P1_ON                                 0b00000010  //  1     1                       enabled (default)
#define RADIOLIB_NRF24_AA_P0_OFF                                0b00000000  //  0     0   auto-ACK on pipe 0: disabled
#define RADIOLIB_NRF24_AA_P0_ON                                 0b00000001  //  0     0                       enabled (default)

// RADIOLIB_NRF24_REG_EN_RXADDR
#define RADIOLIB_NRF24_P5_OFF                                   0b00000000  //  5     5   receive pipe 5: disabled (default)
#define RADIOLIB_NRF24_P5_ON                                    0b00100000  //  5     5                   enabled
#define RADIOLIB_NRF24_P4_OFF                                   0b00000000  //  4     4   receive pipe 4: disabled (default)
#define RADIOLIB_NRF24_P4_ON                                    0b00010000  //  4     4                   enabled
#define RADIOLIB_NRF24_P3_OFF                                   0b00000000  //  3     3   receive pipe 3: disabled (default)
#define RADIOLIB_NRF24_P3_ON                                    0b00001000  //  3     3                   enabled
#define RADIOLIB_NRF24_P2_OFF                                   0b00000000  //  2     2   receive pipe 2: disabled (default)
#define RADIOLIB_NRF24_P2_ON                                    0b00000100  //  2     2                   enabled
#define RADIOLIB_NRF24_P1_OFF                                   0b00000000  //  1     1   receive pipe 1: disabled
#define RADIOLIB_NRF24_P1_ON                                    0b00000010  //  1     1                   enabled (default)
#define RADIOLIB_NRF24_P0_OFF                                   0b00000000  //  0     0   receive pipe 0: disabled
#define RADIOLIB_NRF24_P0_ON                                    0b00000001  //  0     0                   enabled (default)

// RADIOLIB_NRF24_REG_SETUP_AW
#define RADIOLIB_NRF24_ADDRESS_2_BYTES                          0b00000000  //  1     0   address width: 2 bytes
#define RADIOLIB_NRF24_ADDRESS_3_BYTES                          0b00000001  //  1     0                  3 bytes
#define RADIOLIB_NRF24_ADDRESS_4_BYTES                          0b00000010  //  1     0                  4 bytes
#define RADIOLIB_NRF24_ADDRESS_5_BYTES                          0b00000011  //  1     0                  5 bytes (default)

// RADIOLIB_NRF24_REG_SETUP_RETR
#define RADIOLIB_NRF24_ARD                                      0b00000000  //  7     4   auto retransmit delay: t[us] = (NRF24_ARD + 1) * 250 us
#define RADIOLIB_NRF24_ARC_OFF                                  0b00000000  //  3     0   auto retransmit count: auto retransmit disabled
#define RADIOLIB_NRF24_ARC                                      0b00000011  //  3     0                          up to 3 retransmits on AA fail (default)

// RADIOLIB_NRF24_REG_RF_CH
#define RADIOLIB_NRF24_RF_CH                                    0b00000010  //  6     0   RF channel: f_CH[MHz] = 2400 MHz + NRF24_RF_CH

// RADIOLIB_NRF24_REG_RF_SETUP
#define RADIOLIB_NRF24_CONT_WAVE_OFF                            0b00000000  //  7     7   continuous carrier transmit: disabled (default)
#define RADIOLIB_NRF24_CONT_WAVE_ON                             0b10000000  //  7     7                                enabled
#define RADIOLIB_NRF24_DR_250_KBPS                              0b00100000  //  5     5   data rate: 250 kbps
#define RADIOLIB_NRF24_DR_1_MBPS                                0b00000000  //  3     3              1 Mbps (default)
#define RADIOLIB_NRF24_DR_2_MBPS                                0b00001000  //  3     3              2 Mbps
#define RADIOLIB_NRF24_PLL_LOCK_ON                              0b00010000  //  4     4   force PLL lock: enabled
#define RADIOLIB_NRF24_PLL_LOCK_OFF                             0b00000000  //  4     4                   disabled (default)
#define RADIOLIB_NRF24_RF_PWR_18_DBM                            0b00000000  //  2     1   output power: -18 dBm
#define RADIOLIB_NRF24_RF_PWR_12_DBM                            0b00000010  //  2     1                 -12 dBm
#define RADIOLIB_NRF24_RF_PWR_6_DBM                             0b00000100  //  2     1                 -6 dBm
#define RADIOLIB_NRF24_RF_PWR_0_DBM                             0b00000110  //  2     1                 0 dBm (default)
#define RADIOLIB_NRF24_RF_LNA_OFF                               0b00000000  //  0     0   LNA gain: Off
#define RADIOLIB_NRF24_RF_LNA_ON                                0b00000001  //  0     0             On

// RADIOLIB_NRF24_REG_STATUS
#define RADIOLIB_NRF24_RX_DR                                    0b01000000  //  6     6   Rx data ready
#define RADIOLIB_NRF24_TX_DS                                    0b00100000  //  5     5   Tx data sent
#define RADIOLIB_NRF24_MAX_RT                                   0b00010000  //  4     4   maximum number of retransmits reached (must be cleared to continue)
#define RADIOLIB_NRF24_RX_FIFO_EMPTY                            0b00001110  //  3     1   Rx FIFO is empty
#define RADIOLIB_NRF24_RX_P_NO                                  0b00000000  //  3     1   number of data pipe that received data
#define RADIOLIB_NRF24_TX_FIFO_FULL                             0b00000001  //  0     0   Tx FIFO is full

// RADIOLIB_NRF24_REG_OBSERVE_TX
#define RADIOLIB_NRF24_PLOS_CNT                                 0b00000000  //  7     4   number of lost packets
#define RADIOLIB_NRF24_ARC_CNT                                  0b00000000  //  3     0   number of retransmitted packets

// RADIOLIB_NRF24_REG_RPD
#define RADIOLIB_NRF24_RP_BELOW_64_DBM                          0b00000000  //  0     0   received power in the current channel: less than -64 dBm
#define RADIOLIB_NRF24_RP_ABOVE_64_DBM                          0b00000001  //  0     0                                            more than -64 dBm

// RADIOLIB_NRF24_REG_FIFO_STATUS
#define RADIOLIB_NRF24_TX_REUSE                                 0b01000000  //  6     6   reusing last transmitted payload
#define RADIOLIB_NRF24_TX_FIFO_FULL_FLAG                        0b00100000  //  5     5   Tx FIFO is full
#define RADIOLIB_NRF24_TX_FIFO_EMPTY_FLAG                       0b00010000  //  4     4   Tx FIFO is empty
#define RADIOLIB_NRF24_RX_FIFO_FULL_FLAG                        0b00000010  //  1     1   Rx FIFO is full
#define RADIOLIB_NRF24_RX_FIFO_EMPTY_FLAG                       0b00000001  //  0     0   Rx FIFO is empty

// RADIOLIB_NRF24_REG_DYNPD
#define RADIOLIB_NRF24_DPL_P5_OFF                               0b00000000  //  5     5   dynamic payload length on pipe 5: disabled (default)
#define RADIOLIB_NRF24_DPL_P5_ON                                0b00100000  //  5     5                                     enabled
#define RADIOLIB_NRF24_DPL_P4_OFF                               0b00000000  //  4     4   dynamic payload length on pipe 4: disabled (default)
#define RADIOLIB_NRF24_DPL_P4_ON                                0b00010000  //  4     4                                     enabled
#define RADIOLIB_NRF24_DPL_P3_OFF                               0b00000000  //  3     3   dynamic payload length on pipe 3: disabled (default)
#define RADIOLIB_NRF24_DPL_P3_ON                                0b00001000  //  3     3                                     enabled
#define RADIOLIB_NRF24_DPL_P2_OFF                               0b00000000  //  2     2   dynamic payload length on pipe 2: disabled (default)
#define RADIOLIB_NRF24_DPL_P2_ON                                0b00000100  //  2     2                                     enabled
#define RADIOLIB_NRF24_DPL_P1_OFF                               0b00000000  //  1     1   dynamic payload length on pipe 1: disabled (default)
#define RADIOLIB_NRF24_DPL_P1_ON                                0b00000010  //  1     1                                     enabled
#define RADIOLIB_NRF24_DPL_P0_OFF                               0b00000000  //  0     0   dynamic payload length on pipe 0: disabled (default)
#define RADIOLIB_NRF24_DPL_P0_ON                                0b00000001  //  0     0                                     enabled
#define RADIOLIB_NRF24_DPL_ALL_OFF                              0b00000000  //  5     0   disable all dynamic payloads
#define RADIOLIB_NRF24_DPL_ALL_ON                               0b00111111  //  5     0   enable all dynamic payloads

// RADIOLIB_NRF24_REG_FEATURE
#define RADIOLIB_NRF24_DPL_OFF                                  0b00000000  //  2     2   dynamic payload length: disabled (default)
#define RADIOLIB_NRF24_DPL_ON                                   0b00000100  //  2     2                           enabled
#define RADIOLIB_NRF24_ACK_PAY_OFF                              0b00000000  //  1     1   payload with ACK packets: disabled (default)
#define RADIOLIB_NRF24_ACK_PAY_ON                               0b00000010  //  1     1                             enabled
#define RADIOLIB_NRF24_DYN_ACK_OFF                              0b00000000  //  0     0   payloads without ACK: disabled (default)
#define RADIOLIB_NRF24_DYN_ACK_ON                               0b00000001  //  0     0                         enabled

// RadioLib defaults
#define RADIOLIB_NRF24_DEFAULT_FREQ                             2400
#define RADIOLIB_NRF24_DEFAULT_DR                               1000
#define RADIOLIB_NRF24_DEFAULT_POWER                            -12
#define RADIOLIB_NRF24_DEFAULT_ADDRWIDTH                        5

/*!
  \class nRF24
  \brief Control class for %nRF24 module.
*/
class nRF24: 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.
    */
    nRF24(Module* mod); // cppcheck-suppress noExplicitConstructor

    // basic methods

    /*!
      \brief Initialization method.
      \param freq Carrier frequency in MHz. Defaults to 2400 MHz.
      \param dr Data rate to be used in kbps. Defaults to 1000 kbps.
      \param pwr Output power in dBm. Defaults to -12 dBm.
      \param addrWidth Address width in bytes. Defaults to 5 bytes.
      \returns \ref status_codes
    */
      int16_t begin(
        int16_t freq = RADIOLIB_NRF24_DEFAULT_FREQ,
        int16_t dr = RADIOLIB_NRF24_DEFAULT_DR,
        int8_t pwr = RADIOLIB_NRF24_DEFAULT_POWER,
        uint8_t addrWidth = RADIOLIB_NRF24_DEFAULT_ADDRWIDTH);

    /*!
      \brief Sets the module to sleep mode.
      \returns \ref status_codes
    */
    int16_t sleep() override;

    /*!
      \brief Sets the module to standby mode.
      \returns \ref status_codes
    */
    int16_t standby() override;

    /*!
      \brief Sets the module to standby.
      \param mode Standby mode to be used.
      \returns \ref status_codes
    */
    int16_t standby(uint8_t mode) override;

    /*!
      \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 Dummy address parameter, to ensure PhysicalLayer compatibility.
      \returns \ref status_codes
    */
    int16_t transmit(const uint8_t* data, size_t len, uint8_t addr) override;

    /*!
      \brief Binary receive method. Will attempt to receive arbitrary binary data up to 64 bytes long.
      For overloads to receive Arduino String, see PhysicalLayer::receive.
      \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.
      \param timeout Reception timeout in milliseconds. If set to 0,
      timeout period will be calculated automatically based on the radio configuration.
      \returns \ref status_codes
    */
    int16_t receive(uint8_t* data, size_t len, RadioLibTime_t timeout = 0) 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 Dummy direct mode reception method, to ensure PhysicalLayer compatibility.
      \returns \ref status_codes
    */
    int16_t receiveDirect() override;

    // interrupt methods

    /*!
      \brief Sets interrupt service routine to call when IRQ activates.
      \param func ISR to call.
    */
    void setIrqAction(void (*func)(void));

    /*!
      \brief Clears interrupt service routine .
    */
    void clearIrqAction();

    /*!
      \brief Sets interrupt service routine to call when a packet is received.
      \param func ISR to call.
    */
    void setPacketReceivedAction(void (*func)(void)) override;

    /*!
      \brief Clears interrupt service routine to call when a packet is received.
    */
    void clearPacketReceivedAction() override;

    /*!
      \brief Sets interrupt service routine to call when a packet is sent.
      \param func ISR to call.
    */
    void setPacketSentAction(void (*func)(void)) override;

    /*!
      \brief Clears interrupt service routine to call when a packet is sent.
    */
    void clearPacketSentAction() override;

    /*!
      \brief Interrupt-driven binary transmit method. IRQ will be activated when full packet is transmitted.
      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 Dummy address parameter, to ensure PhysicalLayer compatibility.
      \returns \ref status_codes
    */
    int16_t startTransmit(const uint8_t* data, size_t len, uint8_t addr) override;

    /*!
      \brief Clean up after transmission is done.
      \returns \ref status_codes
    */
    int16_t finishTransmit() override;

    /*!
      \brief Interrupt-driven receive method. IRQ will be activated when full packet is received.
      \returns \ref status_codes
    */
    int16_t startReceive() override;

    /*!
      \brief Interrupt-driven receive method, implemented for compatibility with PhysicalLayer.
      \param timeout Ignored.
      \param irqFlags Ignored.
      \param irqMask Ignored.
      \param len Ignored.
      \returns \ref status_codes
    */
    int16_t startReceive(uint32_t timeout, uint32_t irqFlags, uint32_t irqMask, size_t len) override;

    /*!
      \brief Reads data received after calling startReceive method. When the packet length is not known in advance,
      getPacketLength method must be called BEFORE calling readData!
      \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;

    /*!
      \brief Clean up after reception is done.
      \returns \ref status_codes
    */
    int16_t finishReceive() override;

    // configuration methods

    /*!
      \brief Sets carrier frequency. Allowed values range from 2400 MHz to 2525 MHz.
      \param freq Carrier frequency to be set in MHz.
      \returns \ref status_codes
    */
    int16_t setFrequency(float freq) override;

    /*!
      \brief Sets bit rate. Allowed values are 2000, 1000 or 250 kbps.
      \param br Bit rate to be set in kbps.
      \returns \ref status_codes
    */
    int16_t setBitRate(float br) override;

    /*!
      \brief Sets output power. Allowed values are -18, -12, -6 or 0 dBm.
      \param pwr Output power to be set in dBm.
      \returns \ref status_codes
    */
    int16_t setOutputPower(int8_t pwr) override;

    /*!
      \brief Sets address width of transmit and receive pipes in bytes. Allowed values are 3, 4 or 5 bytes.
      \param addrWidth Address width to be set in bytes.
      \returns \ref status_codes
    */
    int16_t setAddressWidth(uint8_t addrWidth);

    /*!
      \brief Sets address of transmit pipe. The address width must be the same as the same
      as the configured in setAddressWidth.
      \param addr Address to which the next packet shall be transmitted.
      \returns \ref status_codes
    */
    int16_t setTransmitPipe(const uint8_t* addr);

    /*!
      \brief Sets address of receive pipes 0 or 1. The address width must be the same as the same
      as the configured in setAddressWidth.
      \param pipeNum Number of pipe to which the address shall be set. Either 0 or 1,
      other pipes are handled using overloaded method.
      \param addr Address from which %nRF24 shall receive new packets on the specified pipe.
      \returns \ref status_codes
    */
    int16_t setReceivePipe(uint8_t pipeNum, const uint8_t* addr);

    /*!
      \brief Sets address of receive pipes 2 - 5. The first 2 - 4 address bytes for these pipes
      are the same as for address pipe 1, only the last byte can be set.
      \param pipeNum Number of pipe to which the address shall be set. Allowed values range from 2 to 5.
      \param addrByte LSB of address from which %nRF24 shall receive new packets on the specified pipe.
      \returns \ref status_codes
    */
    int16_t setReceivePipe(uint8_t pipeNum, uint8_t addrByte);

    /*!
      \brief Disables specified receive pipe.
      \param pipeNum Receive pipe to be disabled.
      \returns \ref status_codes
    */
    int16_t disablePipe(uint8_t pipeNum);

    /*!
      \brief Gets nRF24 status register.
      \param mask Bit mask to be used on the returned register value.
      \returns Status register value or \ref status_codes
    */
    int16_t getStatus(uint8_t mask = 0xFF);

    /*!
      \brief Checks if carrier was detected during last RX
      \returns Whatever the carrier was above threshold.
    */
    bool isCarrierDetected();

    /*!
      \brief Dummy configuration method, to ensure PhysicalLayer compatibility.
      \param freqDev Dummy frequency deviation parameter, no configuration will be changed.
      \returns \ref status_codes
    */
    int16_t setFrequencyDeviation(float freqDev) override;

     /*!
      \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 Enable CRC filtering and generation.
     \param crcOn Set or unset CRC check.
     \returns \ref status_codes
   */
    int16_t setCrcFiltering(bool crcOn = true);

    /*!
     \brief Enable or disable auto-acknowledge packets on all pipes.
     \param autoAckOn Enable (true) or disable (false) auto-acks.
     \returns \ref status_codes
   */
    int16_t setAutoAck(bool autoAckOn = true);

    /*!
     \brief Enable or disable auto-acknowledge packets on given pipe.
     \param pipeNum Number of pipe to which enable / disable auto-acks.
     \param autoAckOn Enable (true) or disable (false) auto-acks.
     \returns \ref status_codes
   */
    int16_t setAutoAck(uint8_t pipeNum, bool autoAckOn);

    /*!
      \brief Dummy data shaping configuration method, to ensure PhysicalLayer compatibility.
      \param sh Ignored.
      \returns \ref status_codes
    */
    int16_t setDataShaping(uint8_t sh) override;

    /*!
      \brief Dummy encoding configuration method, to ensure PhysicalLayer compatibility.
      \param encoding Ignored.
      \returns \ref status_codes
    */
    int16_t setEncoding(uint8_t encoding) override;
    
    /*!
      \brief Enable or disable the low-noise amplifier.
      Improves receive performance at the cost of increased power consumption.
      \param enable True to enable.
      \returns \ref status_codes
    */
    int16_t setLNA(bool enable);

#if !RADIOLIB_GODMODE && !RADIOLIB_LOW_LEVEL
  protected:
#endif
    Module* getMod() override;

    void SPIreadRxPayload(uint8_t* data, uint8_t numBytes);
    void SPIwriteTxPayload(const uint8_t* data, uint8_t numBytes);
    void SPItransfer(uint8_t cmd, bool write = false, const uint8_t* dataOut = NULL, uint8_t* dataIn = NULL, uint8_t numBytes = 0);

#if !RADIOLIB_GODMODE
  private:
#endif
    Module* mod;

    int16_t frequency = RADIOLIB_NRF24_DEFAULT_FREQ;
    int16_t dataRate = RADIOLIB_NRF24_DEFAULT_DR;
    int8_t power = RADIOLIB_NRF24_DEFAULT_POWER;
    uint8_t addressWidth = RADIOLIB_NRF24_DEFAULT_ADDRWIDTH;

    int16_t config();
    void clearIRQ();
};

#endif
