stephen mathenge
Level measurement using range finder and lora technology
Dependencies: Cayenne-LPP SDBlockDevice
Diff: mbed-lora-radio-drv/SX1272/SX1272_LoRaRadio.h
- Revision:
- 0:f930f0440fd5
diff -r 000000000000 -r f930f0440fd5 mbed-lora-radio-drv/SX1272/SX1272_LoRaRadio.h
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed-lora-radio-drv/SX1272/SX1272_LoRaRadio.h Wed Jun 26 10:35:50 2019 +0000
@@ -0,0 +1,431 @@
+/**
+ / _____) _ | |
+( (____ _____ ____ _| |_ _____ ____| |__
+ \____ \| ___ | (_ _) ___ |/ ___) _ \
+ _____) ) ____| | | || |_| ____( (___| | | |
+(______/|_____)_|_|_| \__)_____)\____)_| |_|
+ (C)2013 Semtech
+ ___ _____ _ ___ _ _____ ___ ___ ___ ___
+/ __|_ _/_\ / __| |/ / __/ _ \| _ \/ __| __|
+\__ \ | |/ _ \ (__| ' <| _| (_) | / (__| _|
+|___/ |_/_/ \_\___|_|\_\_| \___/|_|_\\___|___|
+embedded.connectivity.solutions===============
+
+Description: Radio driver for Semtech SX1272 radio. Implements LoRaRadio class.
+
+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 SX1272_LORARADIO_H_
+#define SX1272_LORARADIO_H_
+
+#include "PinNames.h"
+#include "InterruptIn.h"
+#include "DigitalOut.h"
+#include "DigitalInOut.h"
+#include "SPI.h"
+#include "Timeout.h"
+#include "platform/PlatformMutex.h"
+#ifdef MBED_CONF_RTOS_PRESENT
+ #include "rtos/Thread.h"
+#endif
+
+#include "lorawan/LoRaRadio.h"
+
+#ifdef DEVICE_SPI
+
+#ifdef MBED_CONF_SX1272_LORA_DRIVER_BUFFER_SIZE
+#define MAX_DATA_BUFFER_SIZE_SX172 MBED_CONF_SX1272_LORA_DRIVER_BUFFER_SIZE
+#else
+#define MAX_DATA_BUFFER_SIZE_SX172 256
+#endif
+
+/**
+ * Radio driver implementation for Semtech SX1272 plus variants.
+ * Supports only SPI at the moment. Implements pure virtual LoRaRadio class.
+ */
+class SX1272_LoRaRadio: public LoRaRadio {
+public:
+ /**
+ * Use this constructor if pin definitions are provided manually.
+ * The pins that are marked NC are optional. It is assumed that these
+ * pins are not connected until/unless configured otherwise.
+ */
+ SX1272_LoRaRadio(PinName mosi,
+ PinName miso,
+ PinName sclk,
+ PinName nss,
+ PinName reset,
+ PinName dio0,
+ PinName dio1,
+ PinName dio2,
+ PinName dio3,
+ PinName dio4,
+ PinName dio5,
+ PinName rf_switch_ctl1 = NC,
+ PinName rf_switch_ctl2 = NC,
+ PinName txctl = NC,
+ PinName rxctl = NC,
+ PinName ant_switch = NC,
+ PinName pwr_amp_ctl = NC,
+ PinName tcxo = NC);
+
+ /**
+ * Destructor
+ */
+ virtual ~SX1272_LoRaRadio();
+
+ /**
+ * Registers radio events with the Mbed LoRaWAN stack and
+ * undergoes initialization steps if any
+ *
+ * @param events Structure containing the driver callback functions
+ */
+ virtual void init_radio(radio_events_t *events);
+
+ /**
+ * Resets the radio module
+ */
+ virtual void radio_reset();
+
+ /**
+ * Put the RF module in sleep mode
+ */
+ virtual void sleep(void);
+
+ /**
+ * Sets the radio in standby mode
+ */
+ virtual void standby(void);
+
+ /**
+ * Sets the reception parameters
+ *
+ * @param modem Radio modem to be used [0: FSK, 1: LoRa]
+ * @param bandwidth Sets the bandwidth
+ * FSK : >= 2600 and <= 250000 Hz
+ * LoRa: [0: 125 kHz, 1: 250 kHz,
+ * 2: 500 kHz, 3: Reserved]
+ * @param datarate Sets the Datarate
+ * FSK : 600..300000 bits/s
+ * LoRa: [6: 64, 7: 128, 8: 256, 9: 512,
+ * 10: 1024, 11: 2048, 12: 4096 chips]
+ * @param coderate Sets the coding rate ( LoRa only )
+ * FSK : N/A ( set to 0 )
+ * LoRa: [1: 4/5, 2: 4/6, 3: 4/7, 4: 4/8]
+ * @param bandwidth_afc Sets the AFC Bandwidth ( FSK only )
+ * FSK : >= 2600 and <= 250000 Hz
+ * LoRa: N/A ( set to 0 )
+ * @param preamble_len Sets the Preamble length ( LoRa only )
+ * FSK : N/A ( set to 0 )
+ * LoRa: Length in symbols ( the hardware adds 4 more symbols )
+ * @param symb_timeout Sets the RxSingle timeout value
+ * FSK : timeout number of bytes
+ * LoRa: timeout in symbols
+ * @param fixLen Fixed length packets [0: variable, 1: fixed]
+ * @param payload_len Sets payload length when fixed lenght is used
+ * @param crc_on Enables/Disables the CRC [0: OFF, 1: ON]
+ * @param freq_hop_on Enables disables the intra-packet frequency hopping [0: OFF, 1: ON] (LoRa only)
+ * @param hop_period Number of symbols bewteen each hop (LoRa only)
+ * @param iq_inverted Inverts IQ signals ( LoRa only )
+ * FSK : N/A ( set to 0 )
+ * LoRa: [0: not inverted, 1: inverted]
+ * @param rx_continuous Sets the reception in continuous mode
+ * [false: single mode, true: continuous mode]
+ */
+ virtual void set_rx_config (radio_modems_t modem, uint32_t bandwidth,
+ uint32_t datarate, uint8_t coderate,
+ uint32_t bandwidth_afc, uint16_t preamble_len,
+ uint16_t symb_timeout, bool fix_len,
+ uint8_t payload_len,
+ bool crc_on, bool freq_hop_on, uint8_t hop_period,
+ bool iq_inverted, bool rx_continuous);
+
+ /**
+ * Sets the transmission parameters
+ *
+ * @param modem Radio modem to be used [0: FSK, 1: LoRa]
+ * @param power Sets the output power [dBm]
+ * @param fdev Sets the frequency deviation ( FSK only )
+ * FSK : [Hz]
+ * LoRa: 0
+ * @param bandwidth Sets the bandwidth ( LoRa only )
+ * FSK : 0
+ * LoRa: [0: 125 kHz, 1: 250 kHz,
+ * 2: 500 kHz, 3: Reserved]
+ * @param datarate Sets the Datarate
+ * FSK : 600..300000 bits/s
+ * LoRa: [6: 64, 7: 128, 8: 256, 9: 512,
+ * 10: 1024, 11: 2048, 12: 4096 chips]
+ * @param coderate Sets the coding rate ( LoRa only )
+ * FSK : N/A ( set to 0 )
+ * LoRa: [1: 4/5, 2: 4/6, 3: 4/7, 4: 4/8]
+ * @param preamble_len Sets the preamble length
+ * @param fix_len Fixed length packets [0: variable, 1: fixed]
+ * @param crc_on Enables disables the CRC [0: OFF, 1: ON]
+ * @param freq_hop_on Enables disables the intra-packet frequency hopping [0: OFF, 1: ON] (LoRa only)
+ * @param hop_period Number of symbols bewteen each hop (LoRa only)
+ * @param iq_inverted Inverts IQ signals ( LoRa only )
+ * FSK : N/A ( set to 0 )
+ * LoRa: [0: not inverted, 1: inverted]
+ * @param timeout Transmission timeout [us]
+ */
+ virtual void set_tx_config(radio_modems_t modem, int8_t power, uint32_t fdev,
+ uint32_t bandwidth, uint32_t datarate,
+ uint8_t coderate, uint16_t preamble_len,
+ bool fix_len, bool crc_on, bool freq_hop_on,
+ uint8_t hop_period, bool iq_inverted, uint32_t timeout);
+
+ /**
+ * Sends the buffer of size
+ *
+ * Prepares the packet to be sent and sets the radio in transmission
+ *
+ * @param buffer Buffer pointer
+ * @param size Buffer size
+ */
+ virtual void send(uint8_t *buffer, uint8_t size);
+
+ /**
+ * Sets the radio in reception mode for the given time
+ *
+ * It should be noted that if the timeout is set to 0, it essentially
+ * puts the receiver in continuous mode and hence from thereon it should
+ * be treated as if in continuous mode. However, an appropriate way of
+ * setting the receiver in continuous mode is by using set_rx_config()
+ * API.
+ *
+ * @param timeout Reception timeout [ms]
+ *
+ */
+ virtual void receive(uint32_t timeout);
+
+ /**
+ * Sets the carrier frequency
+ *
+ * @param freq Channel RF frequency
+ */
+ virtual void set_channel(uint32_t freq);
+
+ /**
+ * Generates a 32 bits random value based on the RSSI readings
+ *
+ * Remark this function sets the radio in LoRa modem mode and disables
+ * all interrupts.
+ * After calling this function either Radio.SetRxConfig or
+ * Radio.SetTxConfig functions must be called.
+ *
+ * @return 32 bits random value
+ */
+ virtual uint32_t random(void);
+
+ /**
+ * Get radio status
+ *
+ * @param status Radio status [RF_IDLE, RF_RX_RUNNING, RF_TX_RUNNING]
+ * @return Return current radio status
+ */
+ virtual uint8_t get_status(void);
+
+ /**
+ * Sets the maximum payload length
+ *
+ * @param modem Radio modem to be used [0: FSK, 1: LoRa]
+ * @param max Maximum payload length in bytes
+ */
+ virtual void set_max_payload_length(radio_modems_t modem, uint8_t max);
+
+ /**
+ * Sets the network to public or private
+ *
+ * Updates the sync byte. Applies to LoRa modem only
+ *
+ * @param enable if true, it enables a public network
+ */
+ virtual void set_public_network(bool enable);
+
+ /**
+ * Computes the packet time on air for the given payload
+ *
+ * Remark can only be called once SetRxConfig or SetTxConfig have been called
+ *
+ * @param modem Radio modem to be used [0: FSK, 1: LoRa]
+ * @param pkt_len Packet payload length
+ * @return Computed airTime for the given packet payload length
+ */
+ virtual uint32_t time_on_air(radio_modems_t modem, uint8_t pkt_len);
+
+ /**
+ * Perform carrier sensing
+ *
+ * Checks for a certain time if the RSSI is above a given threshold.
+ * This threshold determines if there is already a transmission going on
+ * in the channel or not.
+ *
+ * @param modem Type of the radio modem
+ * @param freq Carrier frequency
+ * @param rssi_threshold Threshold value of RSSI
+ * @param max_carrier_sense_time time to sense the channel
+ *
+ * @return true if there is no active transmission
+ * in the channel, false otherwise
+ */
+ virtual bool perform_carrier_sense(radio_modems_t modem,
+ uint32_t freq,
+ int16_t rssi_threshold,
+ uint32_t max_carrier_sense_time);
+
+ /**
+ * Sets the radio in CAD mode
+ *
+ */
+ virtual void start_cad(void);
+
+ /**
+ * Check if the given RF is in range
+ *
+ * @param frequency frequency needed to be checked
+ */
+ virtual bool check_rf_frequency(uint32_t frequency);
+
+ /** Sets the radio in continuous wave transmission mode
+ *
+ * @param freq Channel RF frequency
+ * @param power Sets the output power [dBm]
+ * @param time Transmission mode timeout [s]
+ */
+ virtual void set_tx_continuous_wave(uint32_t freq, int8_t power, uint16_t time);
+
+ /**
+ * Acquire exclusive access
+ */
+ virtual void lock(void);
+
+ /**
+ * Release exclusive access
+ */
+ virtual void unlock(void);
+
+private:
+
+ // SPI and chip select control
+ mbed::SPI _spi;
+ mbed::DigitalOut _chip_select;
+
+ // module rest control
+ mbed::DigitalInOut _reset_ctl;
+
+ // Interrupt controls
+ mbed::InterruptIn _dio0_ctl;
+ mbed::InterruptIn _dio1_ctl;
+ mbed::InterruptIn _dio2_ctl;
+ mbed::InterruptIn _dio3_ctl;
+ mbed::InterruptIn _dio4_ctl;
+ mbed::InterruptIn _dio5_ctl;
+
+ // Radio specific controls
+ mbed::DigitalOut _rf_switch_ctl1;
+ mbed::DigitalOut _rf_switch_ctl2;
+ mbed::DigitalOut _txctl;
+ mbed::DigitalOut _rxctl;
+ mbed::DigitalInOut _ant_switch;
+ mbed::DigitalOut _pwr_amp_ctl;
+ mbed::DigitalOut _tcxo;
+
+ // Contains all RF control pin names
+ // This storage is needed even after assigning the
+ // pins to corresponding object, as the driver needs to know
+ // which control pins are connected and which are not. This
+ // variation is inherent to driver because of target configuration.
+ rf_ctrls _rf_ctrls;
+
+ // We need these PinNames as not all modules have those connected
+ PinName _dio4_pin;
+ PinName _dio5_pin;
+
+ // Structure containing all user and network specified settings
+ // for radio module
+ radio_settings_t _rf_settings;
+
+ // Structure containing function pointers to the stack callbacks
+ radio_events_t *_radio_events;
+
+ // Data buffer used for both TX and RX
+ // Size of this buffer is configurable via Mbed config system
+ // Default is 256 bytes
+ uint8_t _data_buffer[MAX_DATA_BUFFER_SIZE_SX172];
+
+ // TX/RX Timers - all use milisecond units
+ mbed::Timeout tx_timeout_timer;
+ mbed::Timeout rx_timeout_timer;
+ mbed::Timeout rx_timeout_sync_word;
+
+#ifdef MBED_CONF_RTOS_PRESENT
+ // Thread to handle interrupts
+ rtos::Thread irq_thread;
+#endif
+
+ // Access protection
+ PlatformMutex mutex;
+
+ uint8_t radio_variant;
+
+ /**
+ * Flag used to set the RF switch control pins in low power mode when the radio is not active.
+ */
+ bool radio_is_active;
+
+ // helper functions
+ void setup_registers();
+ void default_antenna_switch_ctrls();
+ void set_antenna_switch(uint8_t operation_mode);
+ void setup_spi();
+ void gpio_init();
+ void gpio_deinit();
+ void setup_interrupts();
+ void set_modem(uint8_t modem);
+ void set_operation_mode(uint8_t mode);
+ void set_low_power_mode(bool status);
+ void set_sx1272_variant_type();
+ uint8_t get_pa_conf_reg();
+ void set_rf_tx_power(int8_t power);
+ int16_t get_rssi(radio_modems_t modem);
+ uint8_t get_fsk_bw_reg_val(uint32_t bandwidth);
+ void write_to_register(uint8_t addr, uint8_t data);
+ void write_to_register(uint8_t addr, uint8_t *data, uint8_t size);
+ uint8_t read_register(uint8_t addr);
+ void read_register(uint8_t addr, uint8_t *buffer, uint8_t size);
+ void write_fifo(uint8_t *buffer, uint8_t size);
+ void read_fifo(uint8_t *buffer, uint8_t size);
+ void transmit(uint32_t timeout);
+ void rf_irq_task(void);
+
+ // ISRs
+ void dio0_irq_isr();
+ void dio1_irq_isr();
+ void dio2_irq_isr();
+ void dio3_irq_isr();
+ void dio4_irq_isr();
+ void dio5_irq_isr();
+ void timeout_irq_isr();
+
+ // Handlers called by thread in response to signal
+ void handle_dio0_irq();
+ void handle_dio1_irq();
+ void handle_dio2_irq();
+ void handle_dio3_irq();
+ void handle_dio4_irq();
+ void handle_dio5_irq();
+ void handle_timeout_irq();
+};
+
+#endif //DEVICE_SPI
+
+#endif /* SX1272_LORARADIO_H_ */