Adafruit_PCF8575 Class Reference

Class that stores state and functions for interacting with the PCF8575 I2C Expander. More...

#include <Adafruit_PCF8575.h>

Public Member Functions
	Adafruit_PCF8575 ()
	Instantiates a new PCF8575 class.
bool	begin (uint8_t i2c_addr=PCF8575_I2CADDR_DEFAULT, TwoWire *wire=&Wire)
	Sets up the hardware and initializes I2C. More...
bool	digitalWriteWord (uint16_t d)
	Write one 'word' of data directly to the GPIO control register. More...
bool	digitalWrite (uint8_t pinnum, bool val)
	Set one GPIO expander pin to 'high' (weak pullup) or 'low' (grounded) More...
uint16_t	digitalReadWord (void)
	Read one 'word' of data directly from the GPIO control register. More...
bool	digitalRead (uint8_t pinnum)
	Get a GPIO expander pin value. More...
bool	pinMode (uint8_t pinnum, uint8_t val)
	Set one GPIO expander pin to 'output' (grounded) or 'input' (weak pullup) More...

Detailed Description

Class that stores state and functions for interacting with the PCF8575 I2C Expander.

Member Function Documentation

begin()

bool Adafruit_PCF8575::begin	(	uint8_t	i2c_address = PCF8575_I2CADDR_DEFAULT,
		TwoWire *	wire = &Wire
	)

Sets up the hardware and initializes I2C.

Parameters

i2c_address	The I2C address to be used.
wire	The Wire object to be used for I2C connections.

Returns

True if initialization was successful, otherwise false.

digitalWriteWord()

bool Adafruit_PCF8575::digitalWriteWord

(

uint16_t

d

)

Write one 'word' of data directly to the GPIO control register.

Parameters

d	The data to write

Returns

True if we were able to write the data successfully over I2C

digitalWrite()

bool Adafruit_PCF8575::digitalWrite	(	uint8_t	pinnum,
		bool	val
	)

Set one GPIO expander pin to 'high' (weak pullup) or 'low' (grounded)

Parameters

pinnum	The GPIO pin number, from 0 to 7 inclusive
val	The boolean value to write: true means activate the pullup and false means turn on the sinking transistor.

Returns

True if we were able to write the data successfully over I2C

digitalReadWord()

uint16_t Adafruit_PCF8575::digitalReadWord

(

void

)

Read one 'word' of data directly from the GPIO control register.

Returns

The byte of data read from the device

digitalRead()

bool Adafruit_PCF8575::digitalRead

(

uint8_t

pinnum

)

Get a GPIO expander pin value.

Parameters

pinnum

The GPIO pin number, from 0 to 7 inclusive

Returns

True if the pin logic is NOT ground, false if the pin logic is ground

pinMode()

bool Adafruit_PCF8575::pinMode	(	uint8_t	pinnum,
		uint8_t	val
	)

Set one GPIO expander pin to 'output' (grounded) or 'input' (weak pullup)

Parameters

pinnum	The GPIO pin number, from 0 to 15 inclusive
val	The value to write: INPUT or INPUT_PULLUP means activate the pullup and OUTPUT means turn on the sinking transistor, as this is an open drain device

Returns

True if we were able to write the data successfully over I2C

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

• Adafruit_PCF8575.h
• Adafruit_PCF8575.cpp