esp32-snippets/PCF8574_8h_source.html

 /*

  * PCF8574.h

  *

  *  Created on: Mar 2, 2017

  *      Author: kolban

  */


 #ifndef COMPONENTS_CPP_UTILS_PCF8574_H_

 #define COMPONENTS_CPP_UTILS_PCF8574_H_

 #include "I2C.h"


 class PCF8574 {

 public:

     PCF8574(uint8_t address);

     virtual ~PCF8574();

     void init(gpio_num_t sdaPin = I2C::DEFAULT_SDA_PIN, gpio_num_t clkPin = I2C::DEFAULT_CLK_PIN);

     uint8_t read();

     bool readBit(uint8_t bit);

     void setInvert(bool value);

     void write(uint8_t value);

     void writeBit(uint8_t bit, bool value);


 private:

     I2C* i2c;

     uint8_t lastWrite;

     bool invert = false;


 };


 #endif /* COMPONENTS_CPP_UTILS_PCF8574_H_ */

I2C::DEFAULT_SDA_PIN
static const gpio_num_t DEFAULT_SDA_PIN
The default SDA pin.
Definition: I2C.h:24

PCF8574::readBit
bool readBit(uint8_t bit)
Read the logic level on a given pin.
Definition: PCF8574.cpp:54

PCF8574::setInvert
void setInvert(bool value)
Invert the bit values. Normally setting a pin's value to 1 means that a high signal is generated and ...
Definition: PCF8574.cpp:107

PCF8574::PCF8574
PCF8574(uint8_t address)
Class constructor.
Definition: PCF8574.cpp:20

PCF8574::write
void write(uint8_t value)
Set the output values of the device.
Definition: PCF8574.cpp:66

PCF8574::init
void init(gpio_num_t sdaPin=I2C::DEFAULT_SDA_PIN, gpio_num_t clkPin=I2C::DEFAULT_CLK_PIN)
Initialize the PCF8574 device.
Definition: PCF8574.cpp:118

I2C::DEFAULT_CLK_PIN
static const gpio_num_t DEFAULT_CLK_PIN
The default Clock pin.
Definition: I2C.h:29

PCF8574::~PCF8574
virtual ~PCF8574()
Class instance destructor.
Definition: PCF8574.cpp:30

I2C
Interface to I2C functions.
Definition: I2C.h:19

PCF8574
Encapsulate a PCF8574 device.
Definition: PCF8574.h:20

PCF8574::writeBit
void writeBit(uint8_t bit, bool value)
Change the output value of a specific pin.
Definition: PCF8574.cpp:86

PCF8574::read
uint8_t read()
Read all the input bits from the device.
Definition: PCF8574.cpp:39