pulsewire::ManchesterPreamble Class Reference

Custom Manchester preamble detector: run-in of alternating edges plus unique start pulse. More...

#include <Preamble.h>

Inheritance diagram for pulsewire::ManchesterPreamble:

Collaboration diagram for pulsewire::ManchesterPreamble:

Public Member Functions
	ManchesterPreamble (uint8_t runInCycles=2)
bool	begin (uint16_t bitFrequencyHz) override
void	setEdges (const pulsewire::Vector< pulsewire::OutputEdge > &edges)
void	addEdge (const pulsewire::OutputEdge &edge)
void	addEdge (bool level, uint32_t pulseUs)
void	addEdge (bool level, uint16_t pulseCount, uint32_t frequencyHz)
void	clear ()
int	getEdges (Vector< OutputEdge > &output) const override
	Returns the expected preamble edges for this protocol.
size_t	preambleLength () const override
void	reset ()
virtual bool	detect (const OutputEdge &edge)
	Detects if the incoming edge matches the expected preamble pattern.
bool	inRange (uint32_t value, uint32_t target, uint32_t tolerance) const

Protected Attributes
pulsewire::Vector< pulsewire::OutputEdge >	_history
pulsewire::Vector< pulsewire::OutputEdge >	_expected

Detailed Description

Custom Manchester preamble detector: run-in of alternating edges plus unique start pulse.

This preamble consists of several cycles of alternating HIGH/LOW pulses (run-in), followed by a unique longer start pulse. This pattern is highly reliable for Manchester encoding, as it provides both clock synchronization and a unique start marker that cannot occur in normal Manchester data. The detector is efficient: it only needs to check the last N edges for the pattern, minimizing processing time.

Example (bitPeriod = 500us, runInCycles = 4): [HIGH 500us, LOW 500us, HIGH 500us, LOW 500us, HIGH 500us, LOW 500us, HIGH 500us, LOW 500us, HIGH 1000us]

• runInCycles: Number of HIGH/LOW cycles for clock synchronization (default: 4)
• bitPeriod: Duration of each bit (default: 500us)
• startPulse: Unique start pulse (default: HIGH, 2x bitPeriod)

Definition at line 202 of file Preamble.h.

Constructor & Destructor Documentation

ManchesterPreamble()

pulsewire::ManchesterPreamble::ManchesterPreamble ( uint8_t  runInCycles = 2 )

inline

Definition at line 204 of file Preamble.h.

Member Function Documentation

addEdge() [1/3]

void pulsewire::CustomPreambleUs::addEdge ( bool  level, uint16_t  pulseCount, uint32_t  frequencyHz  )

inlineinherited

Definition at line 142 of file Preamble.h.

addEdge() [2/3]

void pulsewire::CustomPreambleUs::addEdge ( bool  level, uint32_t  pulseUs  )

inlineinherited

Definition at line 138 of file Preamble.h.

addEdge() [3/3]

void pulsewire::CustomPreambleUs::addEdge ( const pulsewire::OutputEdge &  edge )

inlineinherited

Definition at line 137 of file Preamble.h.

begin()

bool pulsewire::ManchesterPreamble::begin ( uint16_t  bitFrequencyHz )

inlineoverridevirtual

Reimplemented from pulsewire::Preamble.

Definition at line 206 of file Preamble.h.

clear()

void pulsewire::CustomPreambleUs::clear ( )

inlineinherited

Definition at line 147 of file Preamble.h.

detect()

virtual bool pulsewire::Preamble::detect ( const OutputEdge &  edge )

inlinevirtualinherited

Detects if the incoming edge matches the expected preamble pattern.

Reimplemented in pulsewire::IRMultiProtocol, and pulsewire::NoPreamble.

Definition at line 52 of file Preamble.h.

getEdges()

int pulsewire::CustomPreambleUs::getEdges ( Vector< OutputEdge > &  output ) const

inlineoverridevirtualinherited

Returns the expected preamble edges for this protocol.

Implements pulsewire::Preamble.

Definition at line 148 of file Preamble.h.

inRange()

bool pulsewire::Preamble::inRange ( uint32_t  value, uint32_t  target, uint32_t  tolerance  ) const

inlineinherited

Utility function to check if a value is within a specified tolerance range of a target

Definition at line 95 of file Preamble.h.

preambleLength()

size_t pulsewire::CustomPreambleUs::preambleLength ( ) const

inlineoverridevirtualinherited

Implements pulsewire::Preamble.

Definition at line 154 of file Preamble.h.

reset()

void pulsewire::Preamble::reset ( )

inlineinherited

Definition at line 49 of file Preamble.h.

setEdges()

void pulsewire::CustomPreambleUs::setEdges ( const pulsewire::Vector< pulsewire::OutputEdge > &  edges )

inlineinherited

Definition at line 134 of file Preamble.h.

Field Documentation

_expected

pulsewire::Vector<pulsewire::OutputEdge> pulsewire::Preamble::_expected

protectedinherited

Definition at line 102 of file Preamble.h.

_history

pulsewire::Vector<pulsewire::OutputEdge> pulsewire::Preamble::_history

protectedinherited

Definition at line 101 of file Preamble.h.

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

• src/pulse/Preamble.h