Class daisy::Tca9534¶

#include <tca9534.h>

Classes¶

Type	Name
struct	Config

Public Functions¶

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

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);

Public Functions Documentation¶

function Address¶

inline uint8_t daisy::Tca9534::Address () const

function ConfigRegister¶

inline uint8_t daisy::Tca9534::ConfigRegister () const

function Init [⅓]¶

inline void daisy::Tca9534::Init ()

Initialize with default Seed I2C1 pins and address 0x20.

function Init [⅔]¶

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

Initialize and own a dedicated I2C peripheral.

function Init [3/3]¶

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

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

function LastReadOk¶

inline bool daisy::Tca9534::LastReadOk () const

Alias matching early Cosmolab naming.

function LastTransferOk¶

inline bool daisy::Tca9534::LastTransferOk () const

function OutputState¶

inline uint8_t daisy::Tca9534::OutputState () const

function PinMode¶

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

function ReadInput¶

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

function ReadPin¶

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

function SetConfig¶

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

1 = input, 0 = output for each bit.

function SetOutputState¶

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

function Tca9534¶

inline daisy::Tca9534::Tca9534 ()

function WritePin¶

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

The documentation for this class was generated from the following file external-docs/libDaisy/src/dev/tca9534.h