TCA9555 Class Reference

Driver for the TCA9555 I2C I/O expander (header-only). More...

#include <TCA9555.h>

Inheritance diagram for TCA9555:

Public Member Functions
	TCA9555 ()
	Construct a new TCA9555 object with default I2C address 0x20.
bool	begin (IDriverPins &pins) override
	Initialize the TCA9555 and create the I2C bus.
bool	digitalRead (int pin) override
	Read the input state of a pin.
bool	digitalWrite (int pin, bool value) override
	Set the output state of a pin.
void	end () override
	Deinitialize the TCA9555 and delete the I2C bus.
void	pinMode (int pin, int mode) override
	Set the direction of a pin.
void	setI2CAddress (uint8_t address)
	Set the I2C address for the TCA9555.

Protected Member Functions
bool	i2c_read (uint8_t addr, uint8_t reg, uint8_t *data, size_t len)
	Helper to read bytes from the TCA9555 using the platform I2C abstraction.
bool	i2c_write (uint8_t addr, uint8_t reg, uint8_t *data, size_t len)
	Helper to write bytes to the TCA9555 using the platform I2C abstraction.

Protected Attributes
i2c_bus_handle_t	bus = nullptr
uint8_t	i2c_default_address

Detailed Description

Driver for the TCA9555 I2C I/O expander (header-only).

Provides methods to configure pin direction, read and write pin states, and manage the I2C bus.

Constructor & Destructor Documentation

TCA9555()

TCA9555 ( )

inline

Construct a new TCA9555 object with default I2C address 0x20.

Member Function Documentation

begin()

bool begin ( IDriverPins &  pins )

inlineoverridevirtual

Initialize the TCA9555 and create the I2C bus.

Parameters

pins	DriverPins structure with SCL and SDA pin assignments.

Returns

true if initialization was successful, false otherwise.

Implements API_GPIO.

digitalRead()

bool digitalRead ( int  pin )

inlineoverridevirtual

Read the input state of a pin.

Parameters

pin	Pin number (0-15).

Returns

true if HIGH, false if LOW or on error.

Implements API_GPIO.

digitalWrite()

bool digitalWrite ( int  pin, bool  value  )

inlineoverridevirtual

Set the output state of a pin.

Parameters

pin	Pin number (0-15).
value	true for HIGH, false for LOW.

Returns

true if successful, false otherwise.

Implements API_GPIO.

end()

void end ( )

inlineoverridevirtual

Deinitialize the TCA9555 and delete the I2C bus.

Returns

true always.

Implements API_GPIO.

i2c_read()

bool i2c_read ( uint8_t  addr, uint8_t  reg, uint8_t *  data, size_t  len  )

inlineprotected

Helper to read bytes from the TCA9555 using the platform I2C abstraction.

i2c_write()

bool i2c_write ( uint8_t  addr, uint8_t  reg, uint8_t *  data, size_t  len  )

inlineprotected

Helper to write bytes to the TCA9555 using the platform I2C abstraction.

pinMode()

void pinMode ( int  pin, int  mode  )

inlineoverridevirtual

Set the direction of a pin.

Parameters

pin	Pin number (0-15).
input	true for input, false for output.

Returns

true if successful, false otherwise.

Implements API_GPIO.

setI2CAddress()

void setI2CAddress ( uint8_t  address )

inline

Set the I2C address for the TCA9555.

Parameters

address

The new I2C address.

Member Data Documentation

bus

i2c_bus_handle_t bus = nullptr

protected

i2c_default_address

uint8_t i2c_default_address

protected

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

• src/Platforms/TCA9555.h