PCF8574A Class Reference

#include <PCF8574.hh>

Inheritance diagram for PCF8574A:

Collaboration diagram for PCF8574A:

Public Member Functions
	PCF8574A (uint8_t subaddr=7)

Protected Member Functions
bool	data_direction (uint8_t ddr)
bool	input_pin (uint8_t pin)
bool	output_pin (uint8_t pin)
bool	read (uint8_t pin)
uint8_t	read ()
bool	write (uint8_t pin, uint8_t value)
bool	write (uint8_t value)
bool	write (void *buf, size_t size)

Protected Attributes
uint8_t	m_ddr
uint8_t	m_port

Static Protected Attributes
static const uint8_t	PIN_MASK = 0x07

Detailed Description

Definition at line 158 of file PCF8574.hh.

Constructor & Destructor Documentation

PCF8574A::PCF8574A ( uint8_t  subaddr = 7 )

inline

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

Parameters

[in]

subaddr

sub-address (0..7, default 7).

Definition at line 165 of file PCF8574.hh.

Member Function Documentation

bool PCF8574::data_direction ( uint8_t  ddr )

inherited

Set data direction for port pin P0..P7; 0 for output, 1 for input. Return true if set otherwise false.

Parameters

[in]

ddr

data direction mask.

Returns

bool.

Definition at line 24 of file PCF8574.cpp.

bool PCF8574::input_pin ( uint8_t  pin )

inlineinherited

Set given pin as input. Return true if set otherwise false.

Parameters

[in]

pin

number (0..7).

Returns

bool.

Definition at line 75 of file PCF8574.hh.

bool PCF8574::output_pin ( uint8_t  pin )

inlineinherited

Set given pin as output. Return true if set otherwise false.

Parameters

[in]

pin

number (0..7).

Returns

bool.

Definition at line 86 of file PCF8574.hh.

bool PCF8574::read ( uint8_t  pin )

inlineinherited

Read given pin and return true is set otherwise false.

Parameters

[in]

pin

number (0..7).

Returns

bool.

Definition at line 97 of file PCF8574.hh.

uint8_t PCF8574::read ( )

inherited

Read pins and return current values.

Returns

input pin values.

Definition at line 35 of file PCF8574.cpp.

bool PCF8574::write ( uint8_t  pin, uint8_t  value  )

inherited

Write set given output pin if value is non-zero, otherwise clear. Return true if successful otherwise false.

Parameters

[in]	pin	number (0..7).
[in]	value.

Returns

bool.

Definition at line 45 of file PCF8574.cpp.

bool PCF8574::write ( uint8_t  value )

inherited

Write given value to the output pins. Return true if successful otherwise false. Return true if successful otherwise false.

Parameters

[in]

value.

Returns

bool.

Definition at line 59 of file PCF8574.cpp.

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

inherited

Write given values to the output pins. Return true if successful otherwise false. Return true if successful otherwise false.

Parameters

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

Returns

bool.

Definition at line 69 of file PCF8574.cpp.

Member Data Documentation

uint8_t PCF8574::m_ddr

protectedinherited

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

Definition at line 140 of file PCF8574.hh.

uint8_t PCF8574::m_port

protectedinherited

Port Register to mask and maintain output pin values.

Definition at line 143 of file PCF8574.hh.

const uint8_t PCF8574::PIN_MASK = 0x07

staticprotectedinherited

Pin number mask.

Definition at line 137 of file PCF8574.hh.

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

• libraries/PCF8574/PCF8574.hh