daisy::Tca9534 Class Reference

Detailed Description

Driver for the Texas Instruments TCA9534 (and TCA9534A) 8-bit I2C GPIO expander.

Address range is typically 0x20–0x27 depending on A0/A1/A2 (TCA9534A uses 0x38–0x3F).

Two init styles are supported:

• Owned bus: Init(Config) creates/initializes an I2C peripheral (like Mcp23017).
• Shared bus: Init(I2CHandle&, address) reuses an already-configured I2CHandle (useful when LEDs / codecs already own the same bus).

Usage (shared bus):

I2CHandle i2c;
i2c.Init(...);
Tca9534 exp;
exp.Init(i2c, 0x21);
exp.SetConfig(0xFE);          // P0 output, P1–P7 inputs
exp.WritePin(0, true);
uint8_t port = 0;
exp.ReadInput(port);

#include <tca9534.h>

Classes
struct	Config

Public Member Functions
	Tca9534 ()
void	Init ()
void	Init (const Config &config)
void	Init (I2CHandle &i2c, uint8_t address=0x20)
bool	SetConfig (uint8_t config)
bool	SetOutputState (uint8_t output)
bool	PinMode (uint8_t pin, Tca9534Mode mode)
bool	WritePin (uint8_t pin, bool high)
bool	ReadInput (uint8_t &value)
bool	ReadPin (uint8_t pin, bool &high)
bool	LastTransferOk () const
bool	LastReadOk () const
uint8_t	OutputState () const
uint8_t	ConfigRegister () const
uint8_t	Address () const

Constructor & Destructor Documentation

Tca9534()

daisy::Tca9534::Tca9534 ( )

inline

Member Function Documentation

Address()

uint8_t daisy::Tca9534::Address ( ) const

inline

ConfigRegister()

uint8_t daisy::Tca9534::ConfigRegister ( ) const

inline

Init() [1/3]

void daisy::Tca9534::Init ( )

inline

Initialize with default Seed I2C1 pins and address 0x20.

Init() [2/3]

void daisy::Tca9534::Init ( const Config & config )

inline

Initialize and own a dedicated I2C peripheral.

Init() [3/3]

void daisy::Tca9534::Init ( I2CHandle & i2c, uint8_t address = 0x20 )

inline

Attach to an already-initialized I2CHandle (shared bus). Does not re-init the peripheral.

LastReadOk()

bool daisy::Tca9534::LastReadOk ( ) const

inline

Alias matching early Cosmolab naming.

LastTransferOk()

bool daisy::Tca9534::LastTransferOk ( ) const

inline

OutputState()

uint8_t daisy::Tca9534::OutputState ( ) const

inline

PinMode()

bool daisy::Tca9534::PinMode ( uint8_t pin, Tca9534Mode mode )

inline

ReadInput()

bool daisy::Tca9534::ReadInput ( uint8_t & value )

inline

ReadPin()

bool daisy::Tca9534::ReadPin ( uint8_t pin, bool & high )

inline

SetConfig()

bool daisy::Tca9534::SetConfig ( uint8_t config )

inline

1 = input, 0 = output for each bit.

SetOutputState()

bool daisy::Tca9534::SetOutputState ( uint8_t output )

inline

WritePin()

bool daisy::Tca9534::WritePin ( uint8_t pin, bool high )

inline

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

• src/dev/tca9534.h