Philips RC5 / RC5X IR protocol encoder/decoder. More...

Inheritance diagram for m5::unit::ir::Rc5Codec:

Public Member Functions
	Rc5Codec ()
	Constructor.

item_container_type	encode (uint16_t address, uint16_t command, bool repeat) override
	Encode an RC5 or RC5X frame (S2 = ~Cmd[6] when command ≥ 64)

bool	decode (const gpio::m5_rmt_item_t *items, uint32_t num, DecodeResult &result) override
	Decode an RC5 / RC5X Manchester frame (14 bits including S1/S2/T)

uint32_t	carrierFrequencyHz () const override
	Carrier frequency for RC5 (36 kHz)

bool	toggle () const
	Toggle bit state (flipped on each new key press)

void	setToggle (bool t)
	Set toggle bit.

void	flipToggle ()
	Flip toggle bit (call on each new key press)

Public Member Functions inherited from m5::unit::ir::IRCodec
	IRCodec (CodecType t)

CodecType	type () const
	Get codec type for safe downcasting.

virtual float	carrierDuty () const
	Carrier duty cycle (0.0 - 1.0)

virtual uint8_t	minFrames () const
	Number of frames that should be transmitted per keypress for this protocol.

virtual uint16_t	frameGapUs () const
	Inter-frame gap (microseconds) when transmitting multiple frames in one burst.

virtual bool	decode (const m5::unit::gpio::m5_rmt_item_t *items, uint32_t num, DecodeResult &result)=0
	Try to decode RMT items into an IR command.

Detailed Description

Philips RC5 / RC5X IR protocol encoder/decoder.

Carrier: 36 kHz, duty 1/3
Modulation: Manchester (bi-phase)
Bit order: MSB first
RC5: S1(1) + S2(1) + Toggle(1) + Address(5) + Command(6) = 14 bits
RC5X: S1(1) + S2=~Cmd6(1) + Toggle(1) + Address(5) + Command(6) = 14 bits, 128 commands
1 bit = 1778us (64 cycles of 36kHz), half-bit = 889us
RC5 polarity: "0" = mark+space, "1" = space+mark

Member Function Documentation

uint32_t m5::unit::ir::Rc5Codec::carrierFrequencyHz ( ) const

inlineoverridevirtual

Carrier frequency for RC5 (36 kHz)

item_container_type m5::unit::ir::Rc5Codec::encode	(	uint16_t	address,
		uint16_t	command,
		bool	repeat )

overridevirtual

Encode an RC5 or RC5X frame (S2 = ~Cmd[6] when command ≥ 64)

void m5::unit::ir::Rc5Codec::setToggle ( bool t )

inline

Set toggle bit.

Parameters

t	New toggle value; the next encode() emits this bit verbatim