Provides common interface for protocols that run on LoRa/FSK modules, such as RTTY or LoRaWAN. Also extracts some common module-independent methods. Using this interface class allows to use the protocols on various modules without much code duplicity. Because this class is used mainly as interface, all of its virtual members must be implemented in the module class. More...

#include <PhysicalLayer.h>

Inheritance diagram for PhysicalLayer:

Public Member Functions
	PhysicalLayer (float crysFreq, uint8_t divExp, size_t maxPacketLength)
	Default constructor. More...

int16_t	transmit (__FlashStringHelper *fstr, uint8_t addr=0)
	Arduino Flash String transmit method. More...

int16_t	transmit (String &str, uint8_t addr=0)
	Arduino String transmit method. More...

int16_t	transmit (const char *str, uint8_t addr=0)
	C-string transmit method. More...

virtual int16_t	transmit (uint8_t *data, size_t len, uint8_t addr=0)=0
	Binary transmit method. Must be implemented in module class. More...

int16_t	receive (String &str, size_t len=0)
	Arduino String receive method. More...

virtual int16_t	receive (uint8_t *data, size_t len)=0
	Binary receive method. Must be implemented in module class. More...

virtual int16_t	standby ()=0
	Sets module to standby. More...

int16_t	startTransmit (String &str, uint8_t addr=0)
	Interrupt-driven Arduino String transmit method. Unlike the standard transmit method, this one is non-blocking. Interrupt pin will be activated when transmission finishes. More...

int16_t	startTransmit (const char *str, uint8_t addr=0)
	Interrupt-driven Arduino String transmit method. Unlike the standard transmit method, this one is non-blocking. Interrupt pin will be activated when transmission finishes. More...

virtual int16_t	startTransmit (uint8_t *data, size_t len, uint8_t addr=0)=0
	Interrupt-driven binary transmit method. More...

int16_t	readData (String &str, size_t len=0)
	Reads data that was received after calling startReceive method. More...

virtual int16_t	readData (uint8_t *data, size_t len)=0
	Reads data that was received after calling startReceive method. More...

virtual int16_t	transmitDirect (uint32_t FRF=0)=0
	Enables direct transmission mode on pins DIO1 (clock) and DIO2 (data). Must be implemented in module class. While in direct mode, the module will not be able to transmit or receive packets. Can only be activated in FSK mode. More...

virtual int16_t	receiveDirect ()=0
	Enables direct reception mode on pins DIO1 (clock) and DIO2 (data). Must be implemented in module class. While in direct mode, the module will not be able to transmit or receive packets. Can only be activated in FSK mode. More...

virtual int16_t	setFrequencyDeviation (float freqDev)=0
	Sets FSK frequency deviation from carrier frequency. Allowed values depend on bit rate setting and must be lower than 200 kHz. Only available in FSK mode. Must be implemented in module class. More...

float	getCrystalFreq ()
	Gets the module crystal oscillator frequency that was set in constructor. More...

uint8_t	getDivExponent ()
	Gets the module frequency divider exponent that was set in constructor. More...

virtual size_t	getPacketLength (bool update=true)=0
	Query modem for the packet length of received payload. More...

Detailed Description

Provides common interface for protocols that run on LoRa/FSK modules, such as RTTY or LoRaWAN. Also extracts some common module-independent methods. Using this interface class allows to use the protocols on various modules without much code duplicity. Because this class is used mainly as interface, all of its virtual members must be implemented in the module class.

Constructor & Destructor Documentation

PhysicalLayer::PhysicalLayer	(	float	crysFreq,
		uint8_t	divExp,
		size_t	maxPacketLength
	)

Default constructor.

Parameters

crysFreq	Frequency of crystal oscillator inside the module in MHz.
divExp	Exponent of module frequency divider.
maxPacketLength	Maximum length of packet that can be received by the module-

Member Function Documentation

float PhysicalLayer::getCrystalFreq ( )

Gets the module crystal oscillator frequency that was set in constructor.

Returns: Crystal oscillator frequency in MHz.

uint8_t PhysicalLayer::getDivExponent ( )

Gets the module frequency divider exponent that was set in constructor.

Returns: Frequency divider exponent.

virtual size_t PhysicalLayer::getPacketLength ( bool update = true )

pure virtual

Query modem for the packet length of received payload.

Parameters

update Update received packet length. Will return cached value when set to false.

Returns: Length of last received packet in bytes.

Implemented in SX127x.

int16_t PhysicalLayer::readData	(	String &	str,
		size_t	len = `0`
	)

Reads data that was received after calling startReceive method.

Parameters

str	Address of Arduino String to save the received data.
len	Expected number of characters in the message.

Returns: Status Codes

virtual int16_t PhysicalLayer::readData	(	uint8_t *	data,
		size_t	len
	)

pure virtual

Reads data that was received after calling startReceive method.

Parameters

data	Pointer to array to save the received binary data.
len	Number of bytes that will be received. Must be known in advance for binary transmissions.

Returns: Status Codes

Implemented in SX127x.

int16_t PhysicalLayer::receive	(	String &	str,
		size_t	len = `0`
	)

Arduino String receive method.

Parameters

str	Address of Arduino String to save the received data.
len	Expected number of characters in the message. Leave as 0 if expecting a unknown size packet

Returns: Status Codes

virtual int16_t PhysicalLayer::receive	(	uint8_t *	data,
		size_t	len
	)

pure virtual

Binary receive method. Must be implemented in module class.

Parameters

data	Pointer to array to save the received binary data.
len	Number of bytes that will be received. Must be known in advance for binary transmissions.

Returns: Status Codes

Implemented in SX127x.

virtual int16_t PhysicalLayer::receiveDirect ( )

pure virtual

Enables direct reception mode on pins DIO1 (clock) and DIO2 (data). Must be implemented in module class. While in direct mode, the module will not be able to transmit or receive packets. Can only be activated in FSK mode.

Returns: Status Codes

Implemented in SX127x.

virtual int16_t PhysicalLayer::setFrequencyDeviation ( float freqDev )

pure virtual

Sets FSK frequency deviation from carrier frequency. Allowed values depend on bit rate setting and must be lower than 200 kHz. Only available in FSK mode. Must be implemented in module class.

Parameters

freqDev Frequency deviation to be set (in kHz).

Returns: Status Codes

Implemented in SX127x.

virtual int16_t PhysicalLayer::standby ( )

pure virtual

Sets module to standby.

Returns: Status Codes

Implemented in SX127x.

int16_t PhysicalLayer::startTransmit	(	String &	str,
		uint8_t	addr = `0`
	)

Interrupt-driven Arduino String transmit method. Unlike the standard transmit method, this one is non-blocking. Interrupt pin will be activated when transmission finishes.

Parameters

str	Address of Arduino String that will be transmitted.
addr	Node address to transmit the packet to. Only used in FSK mode.

Returns: Status Codes

int16_t PhysicalLayer::startTransmit	(	const char *	str,
		uint8_t	addr = `0`
	)

Interrupt-driven Arduino String transmit method. Unlike the standard transmit method, this one is non-blocking. Interrupt pin will be activated when transmission finishes.

Parameters

str	C-string that will be transmitted.
addr	Node address to transmit the packet to. Only used in FSK mode.

Returns: Status Codes

virtual int16_t PhysicalLayer::startTransmit	(	uint8_t *	data,
		size_t	len,
		uint8_t	addr = `0`
	)

pure virtual

Interrupt-driven binary transmit method.

Parameters

data	Binary data that will be transmitted.
len	Length of binary data to transmit (in bytes).
addr	Node address to transmit the packet to. Only used in FSK mode.

Returns: Status Codes

Implemented in SX127x.

int16_t PhysicalLayer::transmit	(	__FlashStringHelper *	fstr,
		uint8_t	addr = `0`
	)

Arduino Flash String transmit method.

Parameters

str	Pointer to Arduino Flash String that will be transmitted.
addr	Node address to transmit the packet to. Only used in FSK mode.

Returns: Status Codes

int16_t PhysicalLayer::transmit	(	String &	str,
		uint8_t	addr = `0`
	)

Arduino String transmit method.

Parameters

str	Address of Arduino string that will be transmitted.
addr	Node address to transmit the packet to. Only used in FSK mode.

Returns: Status Codes

int16_t PhysicalLayer::transmit	(	const char *	str,
		uint8_t	addr = `0`
	)

C-string transmit method.

Parameters

str	C-string that will be transmitted.
addr	Node address to transmit the packet to. Only used in FSK mode.

Returns: Status Codes

virtual int16_t PhysicalLayer::transmit	(	uint8_t *	data,
		size_t	len,
		uint8_t	addr = `0`
	)

pure virtual

Binary transmit method. Must be implemented in module class.

Parameters

data	Binary data that will be transmitted.
len	Length of binary data to transmit (in bytes).
addr	Node address to transmit the packet to. Only used in FSK mode.

Returns: Status Codes

Implemented in SX127x.

virtual int16_t PhysicalLayer::transmitDirect ( uint32_t FRF = 0 )

pure virtual

Enables direct transmission mode on pins DIO1 (clock) and DIO2 (data). Must be implemented in module class. While in direct mode, the module will not be able to transmit or receive packets. Can only be activated in FSK mode.

Parameters

FRF	24-bit raw frequency value to start transmitting at. Required for quick frequency shifts in RTTY.

Returns: Status Codes

Implemented in SX127x.

The documentation for this class was generated from the following files:

src/protocols/PhysicalLayer/PhysicalLayer.h
src/protocols/PhysicalLayer/PhysicalLayer.cpp

Public Member Functions

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation