peary::component::PCA9539

PCA9539 I/O Expander Component.

#include <peary/hardware/components/PCA9539.hpp>

Inherits from peary::hal::Component

Public Types

Name
enum class Register { INPUT_PORT_0 = 0x00, INPUT_PORT_1 = 0x01, OUTPUT_PORT_0 = 0x02, OUTPUT_PORT_1 = 0x03, POLARITY_INVERSION_PORT_0 = 0x04, POLARITY_INVERSION_PORT_1 = 0x05, CONFIGURATION_PORT_0 = 0x06, CONFIGURATION_PORT_1 = 0x07}
enum class Port { P0 = 0, P1 = 1}
enum class Channel { CH0 = 0, CH1 = 1, CH2 = 2, CH3 = 3, CH4 = 4, CH5 = 5, CH6 = 6, CH7 = 7}

Public Functions

Name
PCA9539(const std::string & i2c_bus, uint8_t device_address)Constructor for PCA9539 class.
bool getInputLevel(Port port, Channel channel)Get the input level of a specific port and channel.
utils::Polarity getOutputLevel(Port port, Channel channel)Get the output level of a specific port and channel.
void setOutputLevel(Port port, Channel channel, utils::Polarity polarity)Set the output level polarity of a specific port and channel.
void invertInputPolarity(Port port, Channel channel, bool invert)Check if the input polarity is inverted for a specific port and channel.
utils::Direction getDirection(Port port, Channel channel)Get the direction (input/output) of a specific port and channel.
void setDirection(Port port, Channel channel, utils::Direction direction)Set the direction (input/output) of a specific port and channel.

Additional inherited members

Public Functions inherited from peary::hal::Component

Name
Component() =defaultDefault constructor.
virtual ~Component() =defaultDefault destructor.

Public Types Documentation

enum Register

Enumerator Value Description
INPUT_PORT_0 0x00
INPUT_PORT_1 0x01
OUTPUT_PORT_0 0x02
OUTPUT_PORT_1 0x03
POLARITY_INVERSION_PORT_0 0x04
POLARITY_INVERSION_PORT_1 0x05
CONFIGURATION_PORT_0 0x06
CONFIGURATION_PORT_1 0x07

enum Port

Enumerator Value Description
P0 0
P1 1

enum Channel

Enumerator Value Description
CH0 0
CH1 1
CH2 2
CH3 3
CH4 4
CH5 5
CH6 6
CH7 7

Public Functions Documentation

function PCA9539 

  PCA9539(
    const std::string & i2c_bus,
    uint8_t device_address
)

Constructor for PCA9539 class.

Parameters:

  • i2c_bus The I2C bus to which the PCA9539 is connected
  • device_address The I2C address of the PCA9539 device

function getInputLevel 

  bool getInputLevel(
    Port port,
    Channel channel
)

Get the input level of a specific port and channel.

Parameters:

  • port The port (P0 or P1)
  • channel The channel (CH0 to CH7)

Return: True if the input level is high, false if low

function getOutputLevel 

  utils::Polarity getOutputLevel(
    Port port,
    Channel channel
)

Get the output level of a specific port and channel.

Parameters:

  • port The port (P0 or P1)
  • channel The channel (CH0 to CH7)

Return: The output level polarity (HIGH or LOW)

function setOutputLevel 

  void setOutputLevel(
    Port port,
    Channel channel,
    utils::Polarity polarity
)

Set the output level polarity of a specific port and channel.

Parameters:

  • port The port (P0 or P1)
  • channel The channel (CH0 to CH7)
  • polarity The desired output level polarity (HIGH or LOW)

function invertInputPolarity 

  void invertInputPolarity(
    Port port,
    Channel channel,
    bool invert
)

Check if the input polarity is inverted for a specific port and channel.

Parameters:

  • port The port (P0 or P1)
  • channel The channel (CH0 to CH7)
  • invert True if the input polarity is inverted, false otherwise

function getDirection 

  utils::Direction getDirection(
    Port port,
    Channel channel
)

Get the direction (input/output) of a specific port and channel.

Parameters:

  • port The port (P0 or P1)
  • channel The channel (CH0 to CH7)

Return: The direction (INPUT or OUTPUT)

function setDirection 

  void setDirection(
    Port port,
    Channel channel,
    utils::Direction direction
)

Set the direction (input/output) of a specific port and channel.

Parameters:

  • port The port (P0 or P1)
  • channel The channel (CH0 to CH7)
  • direction The desired direction (INPUT or OUTPUT)

Updated on 2025-11-14 at 11:31:23 +0100