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mbed-os/features/lorawan/lorastack/phy/LoRaPHY.h

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/**
* @file LoRaPHY.h
*
* @brief An abstract class providing radio object to children and
* provide base for implementing LoRa PHY layer
*
* \code
* ______ _
* / _____) _ | |
* ( (____ _____ ____ _| |_ _____ ____| |__
* \____ \| ___ | (_ _) ___ |/ ___) _ \
* _____) ) ____| | | || |_| ____( (___| | | |
* (______/|_____)_|_|_| \__)_____)\____)_| |_|
* (C)2013 Semtech
* ___ _____ _ ___ _ _____ ___ ___ ___ ___
* / __|_ _/_\ / __| |/ / __/ _ \| _ \/ __| __|
* \__ \ | |/ _ \ (__| ' <| _| (_) | / (__| _|
* |___/ |_/_/ \_\___|_|\_\_| \___/|_|_\\___|___|
* embedded.connectivity.solutions===============
*
* \endcode
*
* Description: LoRa PHY layer
*
* License: Revised BSD License, see LICENSE.TXT file include in the project
*
* Maintainer: Miguel Luis ( Semtech ), Gregory Cristian ( Semtech ) and Daniel Jaeckle ( STACKFORCE )
*
* Copyright (c) 2017, Arm Limited and affiliates.
* SPDX-License-Identifier: BSD-3-Clause
*
*/
#ifndef MBED_OS_LORAPHY_BASE_
#define MBED_OS_LORAPHY_BASE_
#include "lorawan/LoRaRadio.h"
#include "lorawan/system/LoRaWANTimer.h"
#include "lorawan/lorastack/phy/lora_phy_ds.h"
#include "platform/NonCopyable.h"
class LoRaPHY : private mbed::NonCopyable<LoRaPHY> {
public:
virtual ~LoRaPHY();
/** Stores a reference to Radio object.
*
* Application is responsible for constructing a 'LoRaRadio' object
* which is passed down to the PHY layer.
*
* @param radio a reference to radio driver object
*/
void set_radio_instance(LoRaRadio& radio);
/** Puts radio in sleep mode.
*
* Requests the radio driver to enter sleep mode.
*/
void put_radio_to_sleep(void);
/** Puts radio in standby mode.
*
* Requests the radio driver to enter standby mode.
*/
void put_radio_to_standby(void);
/** Puts radio in receive mode.
*
* Requests the radio driver to enter receive mode for a given time or to
* enter continuous reception mode.
*
* @param is_rx_continuous if true, sets the radio to enter continuous
* reception mode.
*
* @param max_rx_window duration of receive window
*/
void setup_rx_window(bool is_rx_continuous, uint32_t max_rx_window);
/** Delegates MAC layer request to transmit packet.
*
* @param buf a pointer to the data which needs to be transmitted
*
* @param size size of the data in bytes
*/
void handle_send(uint8_t *buf, uint8_t size);
/** Enables/Disables public network mode.
*
* Public and private LoRaWAN network constitute different preambles and
* Net IDs. This API isused to tell the radio which network mode is in use.
*
* @param set true or false
*/
void setup_public_network_mode(bool set);
/** Provides a random number from radio.
*
* Returns a 32-bit random unsigned integer value based upon RSSI
* measurements.
*
* @return a 32-bit long random number
*
*/
uint32_t get_radio_rng();
/** Calculates and applies duty cycle back-off time.
*
* Explicitly updates the band time-off.
*
* @param [in] backoff_params A pointer to backoff parameters.
*/
void calculate_backoff(backoff_params_t* backoff_params);
/**
* Tests if a channel is on or off in the channel mask
*/
inline bool mask_bit_test(const uint16_t *mask, unsigned bit) {
return mask[bit/16] & (1U << (bit % 16));
}
/**
* Tests if a channel is on or off in the channel mask
*/
inline void mask_bit_set(uint16_t *mask, unsigned bit) {
mask[bit/16] |= (1U << (bit % 16));
}
/**
* Tests if a channel is on or off in the channel mask
*/
inline void mask_bit_clear(uint16_t *mask, unsigned bit) {
mask[bit/16] &= ~(1U << (bit % 16));
}
/** Entertain a new channel request MAC command.
*
* MAC command subsystem processes the new channel request coming form
* the network server and then MAC layer asks the PHY layer to entertain
* the request.
*
* @param [in] new_channel_req A pointer to the new_channel_req_params_t.
*
* @return bit mask, according to the LoRaWAN spec 1.0.2.
*/
virtual uint8_t request_new_channel(new_channel_req_params_t* new_channel_req);
/** Grants access to PHY layer parameters.
*
* This is essentially a PHY layer parameter retrieval system.
* A request is made for a certain parameter by setting an appropriate
* attribute.
*
* @param [in] get_phy A pointer to get_phy_params_t
*
* @return A structure containing the requested PHY parameter value.
*/
virtual phy_param_t get_phy_params(get_phy_params_t* get_phy);
/** Process PHY layer state after a successful transmission.
*
* Updates times of the last transmission for the particular channel and
* band upon which last transmission took place.
*
* @param [in] tx_done A pointer to set_band_txdone_params_t
*/
virtual void set_last_tx_done(set_band_txdone_params_t* tx_done);
/** Enables default channels only.
*
* Falls back to a channel mask where only default channels are enabled, all
* other channels are disabled.
*/
virtual void restore_default_channels();
/** Verify if a parameter is eligible.
*
* @param verify A pointer to the verification_params_t that contains
* parameters which we need to check for validity.
*
* @param phy_attr The attribute for which the verification is needed.
*
* @return True, if the parameter is valid.
*/
virtual bool verify(verification_params_t* verify, phy_attributes_t phy_attr);
/** Processes the incoming CF-list.
*
* Handles the payload containing CF-list and enables channels defined
* therein.
*
* @param cflist_params A pointer to cflist_params_t.
*/
virtual void apply_cf_list(cflist_params_t* cflist_params);
/** Calculates the next datarate to set, when ADR is on or off.
*
* @param restore_channel_mask A boolean set restore channel mask in case
* of failure.
*
* @param dr_out The calculated datarate for the next TX.
*
* @param tx_power_out The TX power for the next TX.
*
* @param adr_ack_counter The calculated ADR acknowledgement counter.
*
* @return True, if an ADR request should be performed.
*/
bool get_next_ADR(bool restore_channel_mask, int8_t& dr_out,
int8_t& tx_power_out, uint32_t& adr_ack_counter);
/** Configure radio reception.
*
* @param [in] config A pointer to the RX configuration.
*
* @param [out] datarate The datarate index set.
*
* @return True, if the configuration was applied successfully.
*/
virtual bool rx_config(rx_config_params_t* config, int8_t* datarate);
/** Computing Receive Windows
*
* For more details please consult the following document, chapter 3.1.2.
* http://www.semtech.com/images/datasheet/SX1272_settings_for_LoRaWAN_v2.0.pdf
* or
* http://www.semtech.com/images/datasheet/SX1276_settings_for_LoRaWAN_v2.0.pdf
*
* Downlink start: T = Tx + 1s (+/- 20 us)
* |
* TRxEarly | TRxLate
* | | |
* | | +---+---+---+---+---+---+---+---+
* | | | Latest Rx window |
* | | +---+---+---+---+---+---+---+---+
* | | |
* +---+---+---+---+---+---+---+---+
* | Earliest Rx window |
* +---+---+---+---+---+---+---+---+
* |
* +---+---+---+---+---+---+---+---+
*Downlink preamble 8 symbols | | | | | | | | |
* +---+---+---+---+---+---+---+---+
*
* Worst case Rx window timings
*
* TRxLate = DEFAULT_MIN_RX_SYMBOLS * tSymbol - RADIO_WAKEUP_TIME
* TRxEarly = 8 - DEFAULT_MIN_RX_SYMBOLS * tSymbol - RxWindowTimeout - RADIO_WAKEUP_TIME
*
* TRxLate - TRxEarly = 2 * DEFAULT_SYSTEM_MAX_RX_ERROR
*
* RxOffset = ( TRxLate + TRxEarly ) / 2
*
* RxWindowTimeout = ( 2 * DEFAULT_MIN_RX_SYMBOLS - 8 ) * tSymbol + 2 * DEFAULT_SYSTEM_MAX_RX_ERROR
* RxOffset = 4 * tSymbol - RxWindowTimeout / 2 - RADIO_WAKE_UP_TIME
*
* The minimum value of RxWindowTimeout must be 5 symbols which implies that the system always tolerates at least an error of 1.5 * tSymbol.
*/
/*!
* Computes the RX window timeout and offset.
*
* @param [in] datarate The RX window datarate index to be used.
*
* @param [in] min_rx_symbols The minimum number of symbols required to
* detect an RX frame.
*
* @param [in] rx_error The maximum timing error of the receiver
* in milliseconds. The receiver will turn on
* in a [-rxError : +rxError] ms interval around
* RxOffset.
*
* @param [out] rx_conf_params Pointer to the structure that needs to be
* filled with receive window parameters.
*
*/
virtual void compute_rx_win_params(int8_t datarate, uint8_t min_rx_symbols,
uint32_t rx_error,
rx_config_params_t *rx_conf_params);
/** Configure radio transmission.
*
* @param [in] tx_config Structure containing tx parameters.
*
* @param [out] tx_power The TX power which will be set.
*
* @param [out] tx_toa The time-on-air of the frame.
*
* @return True, if the configuration was applied successfully.
*/
virtual bool tx_config(tx_config_params_t* tx_config, int8_t* tx_power,
lorawan_time_t* tx_toa);
/** Processes a Link ADR Request.
*
* @param [in] params A pointer ADR request parameters.
*
* @param [out] dr_out The datarate applied.
*
* @param [out] tx_power_out The TX power applied.
*
* @param [out] nb_rep_out The number of repetitions to apply.
*
* @param [out] nb_bytes_parsed The number of bytes parsed.
*
* @return The status of the operation, according to the LoRaMAC specification.
*/
virtual uint8_t link_ADR_request(adr_req_params_t* params,
int8_t* dr_out, int8_t* tx_power_out,
uint8_t* nb_rep_out,
uint8_t* nb_bytes_parsed);
/** Accept or rejects RxParamSetupReq MAC command
*
* The function processes a RX parameter setup request in response to
* server MAC command for RX setup.
*
* @param [in] params A pointer to rx parameter setup request.
*
* @return The status of the operation, according to the LoRaWAN specification.
*/
virtual uint8_t accept_rx_param_setup_req(rx_param_setup_req_t* params);
/** Makes decision whether to accept or reject TxParamSetupReq MAC command
*
* @param [in] params A pointer to tx parameter setup request.
*
* @return True to let the MAC know that the request is
* accepted and MAC can apply TX parameters received
* form Network Server. Otherwise false is returned.
*/
virtual bool accept_tx_param_setup_req(tx_param_setup_req_t* params);
/** Processes a DlChannelReq MAC command.
*
* @param [in] params A pointer to downlink channel request.
*
* @return The status of the operation, according to the LoRaWAN specification.
*/
virtual uint8_t dl_channel_request(dl_channel_req_params_t* params);
/** Alternates the datarate of the channel for the join request.
*
* @param nb_trials Number of trials to be made on one given data rate.
*
* @return The datarate to apply .
*/
virtual int8_t get_alternate_DR(uint8_t nb_trials);
/** Searches and sets the next available channel.
*
* If there are multiple channels found available, one of them is selected
* randomly.
*
* @param [in] nextChanParams Parameters for the next channel.
*
* @param [out] channel The next channel to use for TX.
*
* @param [out] time The time to wait for the next transmission according to the duty cycle.
*
* @param [out] aggregatedTimeOff Updates the aggregated time off.
*
* @return Function status [1: OK, 0: Unable to find a channel on the current datarate].
*/
virtual bool set_next_channel(channel_selection_params_t* nextChanParams,
uint8_t* channel, lorawan_time_t* time,
lorawan_time_t* aggregatedTimeOff);
/** Adds a channel to the channel list.
*
* Verifies the channel parameters and if everything is found legitimate,
* adds that particular channel to the channel list and updates the channel
* mask.
*
* @param [in] new_channel A pointer to the parameters for the new channel.
* @param [in] id Channel ID
*
* @return LORAWAN_STATUS_OK if everything goes fine, negative error code
* otherwise.
*/
virtual lorawan_status_t add_channel(channel_params_t* new_channel, uint8_t id);
/** Removes a channel from the channel list.
*
* @param [in] channel_id Index of the channel to be removed
*
* @return True, if the channel was removed successfully.
*/
virtual bool remove_channel(uint8_t channel_id);
/** Puts the radio into continuous wave mode.
*
* @param [in] continuous_wave A pointer to the function parameters.
*
* @param [in] frequency Frequency to transmit at
*/
virtual void set_tx_cont_mode(cw_mode_params_t* continuous_wave,
uint32_t frequency = 0);
/** Computes new data rate according to the given offset
*
* @param [in] dr The current datarate.
*
* @param [in] dr_offset The offset to be applied.
*
* @return The computed datarate.
*/
virtual uint8_t apply_DR_offset(int8_t dr, int8_t dr_offset);
protected:
LoRaRadio *_radio;
LoRaWANTimeHandler &_lora_time;
loraphy_params_t phy_params;
LoRaPHY(LoRaWANTimeHandler &lora_time);
/**
* Verifies the given frequency.
*/
virtual bool verify_frequency(uint32_t freq);
/**
* Verifies, if a value is in a given range.
*/
uint8_t val_in_range(int8_t value, int8_t min, int8_t max);
/**
* Verifies, if a datarate is available on an active channel.
*/
bool verify_channel_DR(uint8_t nbChannels, uint16_t* channelsMask, int8_t dr,
int8_t minDr, int8_t maxDr, channel_params_t* channels);
/**
* Disables a channel in a given channels mask.
*/
bool disable_channel(uint16_t* channel_mask, uint8_t id, uint8_t max_channels);
/**
* Counts number of bits on in a given mask
*/
uint8_t count_bits(uint16_t mask, uint8_t nb_bits);
/**
* Counts the number of active channels in a given channels mask.
*/
uint8_t num_active_channels(uint16_t* channel_mask, uint8_t start_idx,
uint8_t stop_idx);
/**
* Copy channel masks.
*/
void copy_channel_mask(uint16_t* dest_mask, uint16_t* src_mask, uint8_t len);
/**
* Updates the time-offs of the bands.
*/
lorawan_time_t update_band_timeoff(bool joined, bool dutyCycle, band_t* bands,
uint8_t nb_bands);
/**
* Parses the parameter of an LinkAdrRequest.
*/
uint8_t parse_link_ADR_req(uint8_t* payload, link_adr_params_t* adr_params);
/**
* Verifies and updates the datarate, the TX power and the number of repetitions
* of a LinkAdrRequest.
*/
uint8_t verify_link_ADR_req(verify_adr_params_t* verify_params, int8_t* dr,
int8_t* tx_pow, uint8_t* nb_rep);
/**
* Computes the symbol time for LoRa modulation.
*/
double compute_symb_timeout_lora(uint8_t phy_dr, uint32_t bandwidth );
/**
* Computes the symbol time for FSK modulation.
*/
double compute_symb_timeout_fsk(uint8_t phy_dr);
/**
* Computes the RX window timeout and the RX window offset.
*/
void get_rx_window_params(double t_symbol, uint8_t min_rx_symbols,
uint32_t rx_error, uint32_t wakeup_time,
uint32_t* window_timeout, int32_t* window_offset);
/**
* Computes the txPower, based on the max EIRP and the antenna gain.
*/
int8_t compute_tx_power(int8_t txPowerIndex, float maxEirp, float antennaGain);
/**
* Provides a random number in the range provided.
*/
int32_t get_random(int32_t min, int32_t max);
/**
* Get next lower data rate
*/
int8_t get_next_lower_dr(int8_t dr, int8_t min_dr);
/**
* Get channel bandwidth depending upon data rate table index
*/
uint8_t get_bandwidth(uint8_t dr_index);
uint8_t enabled_channel_count(bool joined, uint8_t datarate,
const uint16_t *mask, uint8_t* enabledChannels,
uint8_t* delayTx);
};
#endif /* MBED_OS_LORAPHY_BASE_ */
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