MCP23017 main class. More...

#include <Adafruit_MCP23017.h>

Public Member Functions
void	begin (uint8_t addr, TwoWire *theWire=&Wire)

void	begin (TwoWire *theWire=&Wire)

void	pinMode (uint8_t p, uint8_t d)

void	digitalWrite (uint8_t p, uint8_t d)
	Writes to a pin on the MCP23017. More...

void	pullUp (uint8_t p, uint8_t d)
	Enables the pull-up resistor on the specified pin. More...

uint8_t	digitalRead (uint8_t p)
	Reads the specified pin. More...

void	writeGPIOAB (uint16_t)

uint16_t	readGPIOAB ()

uint8_t	readGPIO (uint8_t b)

void	setupInterrupts (uint8_t mirroring, uint8_t open, uint8_t polarity)

void	setupInterruptPin (uint8_t pin, uint8_t mode)

void	disableInterruptPin (uint8_t pin)

uint8_t	getLastInterruptPin ()
	Gets the last interrupt pin. More...

uint8_t	getLastInterruptPinValue ()
	Gets the value of the last interrupt pin. More...

Detailed Description

MCP23017 main class.

Definition at line 24 of file Adafruit_MCP23017.h.

Member Function Documentation

◆ begin() [1/2]

void Adafruit_MCP23017::begin ( TwoWire * theWire = &Wire )

Initializes the default MCP23017, with 000 for the configurable part of the address

Parameters

theWire the I2C object to use, defaults to &Wire

Definition at line 147 of file Adafruit_MCP23017.cpp.

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◆ begin() [2/2]

void Adafruit_MCP23017::begin	(	uint8_t	addr,
		TwoWire *	theWire = `&Wire`
	)

Initializes the MCP23017 given its HW selected address, see datasheet for Address selection.

Parameters

addr	Selected address
theWire	the I2C object to use, defaults to &Wire

Definition at line 119 of file Adafruit_MCP23017.cpp.

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◆ digitalRead()

uint8_t Adafruit_MCP23017::digitalRead ( uint8_t pin )

Reads the specified pin.

Parameters

pin	Pin to read

Returns: Value of the pin

Definition at line 247 of file Adafruit_MCP23017.cpp.

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◆ digitalWrite()

void Adafruit_MCP23017::digitalWrite	(	uint8_t	pin,
		uint8_t	d
	)

Writes to a pin on the MCP23017.

Parameters

pin	Pin to write to
d	What to write to the pin

Definition at line 217 of file Adafruit_MCP23017.cpp.

◆ disableInterruptPin()

void Adafruit_MCP23017::disableInterruptPin ( uint8_t pin )

Disable a pin for interrupt.

Parameters

pin	Pin to set

Definition at line 313 of file Adafruit_MCP23017.cpp.

◆ getLastInterruptPin()

uint8_t Adafruit_MCP23017::getLastInterruptPin ( )

Gets the last interrupt pin.

Returns: Returns the last interrupt pin

Definition at line 322 of file Adafruit_MCP23017.cpp.

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◆ getLastInterruptPinValue()

uint8_t Adafruit_MCP23017::getLastInterruptPinValue ( )

Gets the value of the last interrupt pin.

Returns: Returns the value of the last interrupt pin

Definition at line 343 of file Adafruit_MCP23017.cpp.

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◆ pinMode()

void Adafruit_MCP23017::pinMode	(	uint8_t	p,
		uint8_t	d
	)

Sets the pin mode to either INPUT or OUTPUT

Parameters

p	Pin to set
d	Mode to set the pin

Definition at line 154 of file Adafruit_MCP23017.cpp.

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◆ pullUp()

void Adafruit_MCP23017::pullUp	(	uint8_t	p,
		uint8_t	d
	)

Enables the pull-up resistor on the specified pin.

Parameters

p	Pin to set
d	Value to set the pin

Definition at line 238 of file Adafruit_MCP23017.cpp.

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◆ readGPIO()

uint8_t Adafruit_MCP23017::readGPIO ( uint8_t b )

Read a single port, A or B, and return its current 8 bit value.

Parameters

b	Decided what gpio to use. Should be 0 for GPIOA, and 1 for GPIOB.

Returns: Returns the b bit value of the port

Definition at line 185 of file Adafruit_MCP23017.cpp.

◆ readGPIOAB()

uint16_t Adafruit_MCP23017::readGPIOAB ( )

Reads all 16 pins (port A and B) into a single 16 bits variable.

Returns: Returns the 16 bit variable representing all 16 pins

Definition at line 162 of file Adafruit_MCP23017.cpp.

◆ setupInterruptPin()

void Adafruit_MCP23017::setupInterruptPin	(	uint8_t	pin,
		uint8_t	mode
	)

Set's up a pin for interrupt. uses arduino MODEs: CHANGE, FALLING, RISING.

Note that the interrupt condition finishes when you read the information about the port / value that caused the interrupt or you read the port itself. Check the datasheet can be confusing.

Parameters

pin	Pin to set
mode	Mode to set the pin

Definition at line 290 of file Adafruit_MCP23017.cpp.

◆ setupInterrupts()

void Adafruit_MCP23017::setupInterrupts	(	uint8_t	mirroring,
		uint8_t	openDrain,
		uint8_t	polarity
	)

Configures the interrupt system. both port A and B are assigned the same configuration.

Parameters

mirroring	Mirroring will OR both INTA and INTB pins.
openDrain	Opendrain will set the INT pin to value or open drain.
polarity	polarity will set LOW or HIGH on interrupt. Default values after Power On Reset are: (false, false, LOW) If you are connecting the INTA/B pin to arduino 2/3, you should configure the interupt handling as FALLING with the default configuration.

Definition at line 263 of file Adafruit_MCP23017.cpp.

◆ writeGPIOAB()

void Adafruit_MCP23017::writeGPIOAB ( uint16_t ba )

Writes all the pins in one go. This method is very useful if you are implementing a multiplexed matrix and want to get a decent refresh rate.

Definition at line 204 of file Adafruit_MCP23017.cpp.

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

C:/Users/patfl/AppData/Local/Arduino15/libraries/LccFusionCore/src/LccFusionCore/Adafruit_MCP23017.h
C:/Users/patfl/AppData/Local/Arduino15/libraries/LccFusionCore/src/LccFusionCore/Adafruit_MCP23017.cpp

Public Member Functions

Detailed Description

Member Function Documentation

◆ begin() [1/2]

◆ begin() [2/2]

◆ digitalRead()

◆ digitalWrite()

◆ disableInterruptPin()

◆ getLastInterruptPin()

◆ getLastInterruptPinValue()

◆ pinMode()

◆ pullUp()

◆ readGPIO()

◆ readGPIOAB()

◆ setupInterruptPin()

◆ setupInterrupts()

◆ writeGPIOAB()