PCF8574A Class Reference

#include <PCF8574.h>

Inheritance diagram for PCF8574A:

Collaboration diagram for PCF8574A:

Public Member Functions
	PCF8574A (TWI &twi, uint8_t subaddr=7)
uint8_t	ddr ()
void	ddr (uint8_t ddr)
uint8_t	read ()
uint8_t	port ()
void	write (uint8_t value)
void	write (void *buf, size_t size)

Protected Member Functions
int	read (void *buf, size_t count)
int	write (const void *buf, size_t count)
int	write (iovec_t *vp)
bool	acquire ()
bool	release ()

Protected Attributes
uint8_t	m_ddr
uint8_t	m_port
TWI &	m_twi
uint8_t	m_addr

Detailed Description

Definition at line 236 of file PCF8574.h.

Constructor & Destructor Documentation

PCF8574A::PCF8574A ( TWI &  twi, uint8_t  subaddr = 7  )

inline

Construct connection to PCF8574A Remote 8-bit I/O expander with given sub-address.

Parameters

[in]	twi	bus manager.
[in]	subaddr	sub-address (0..7, default 7).

Definition at line 244 of file PCF8574.h.

Member Function Documentation

bool TWI::Device::acquire ( )

inlineinherited

Start transaction. Return true(1) if successful otherwise false(0).

Returns

bool.

Definition at line 52 of file TWI.h.

uint8_t PCF8574::ddr ( )

inlineinherited

Get data direction for port; 0 for output, 1 for input.

Returns

data direction.

Definition at line 64 of file PCF8574.h.

void PCF8574::ddr ( uint8_t  ddr )

inlineinherited

Set data direction for port pin P0..P7; 0 for output, 1 for input.

Parameters

[in]

ddr

data direction mask.

Definition at line 73 of file PCF8574.h.

uint8_t PCF8574::port ( )

inlineinherited

Get data port values.

Returns

port value.

Definition at line 99 of file PCF8574.h.

int TWI::Device::read ( void *  buf, size_t  count  )

inlineinherited

Read data from device to given buffer.

Parameters

[in]	buf	buffer pointer.
[in]	count	buffer size in bytes.

Returns

number of bytes read or negative error code.

Definition at line 73 of file TWI.h.

uint8_t PCF8574::read ( )

inlineinherited

Read pins and return current values.

Returns

input pin values.

Definition at line 86 of file PCF8574.h.

bool TWI::Device::release ( )

inlineinherited

Stop transaction. Return true(1) if successful otherwise false(0).

Returns

bool.

Definition at line 62 of file TWI.h.

int TWI::Device::write ( const void *  buf, size_t  count  )

inlineinherited

Write data from the given buffer to device.

Parameters

[in]	buf	buffer pointer.
[in]	count	buffer size in bytes.

Returns

number of bytes written or negative error code.

Definition at line 84 of file TWI.h.

int TWI::Device::write ( iovec_t *  vp )

inlineinherited

Write data to device with from given io vector.

Parameters

[in]

vp

io vector pointer.

Returns

number of bytes written or negative error code.

Definition at line 94 of file TWI.h.

void PCF8574::write ( uint8_t  value )

inlineinherited

Write given value to the output pins.

Parameters

[in]

value

to write to port.

Definition at line 108 of file PCF8574.h.

void PCF8574::write ( void *  buf, size_t  size  )

inlineinherited

Write given values to the output pins.

Parameters

[in]	buf	pointer to data to write to device.
[in]	size	of buffer.

Definition at line 121 of file PCF8574.h.

Member Data Documentation

uint8_t TWI::Device::m_addr

protectedinherited

Device address.

Definition at line 104 of file TWI.h.

uint8_t PCF8574::m_ddr

protectedinherited

Data Direction Register, 0 = output, 1 = input.

Definition at line 217 of file PCF8574.h.

uint8_t PCF8574::m_port

protectedinherited

Port Register to mask and maintain output pin values.

Definition at line 220 of file PCF8574.h.

TWI& TWI::Device::m_twi

protectedinherited

Two-Wire Interface Manager.

Definition at line 101 of file TWI.h.

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

• src/Driver/PCF8574.h