Adafruit_MCP23017.h

Go to the documentation of this file.

/***************************************************
  This is a library for the MCP23017 i2c port expander
 
  These displays use I2C to communicate, 2 pins are required to
  interface
  Adafruit invests time and resources providing this open source code,
  please support Adafruit and open-source hardware by purchasing
  products from Adafruit!
 
  Written by Limor Fried/Ladyada for Adafruit Industries.
  BSD license, all text above must be included in any redistribution
 ****************************************************/
 
#ifndef _Adafruit_MCP23017_H_
#define _Adafruit_MCP23017_H_
 
#include <driver/i2c.h>
#include <mutex>
#include <stdint.h>
 
class Adafruit_MCP23017 {
public:
    Adafruit_MCP23017(uint8_t addr, i2c_port_t port, gpio_num_t sda, gpio_num_t scl);
    ~Adafruit_MCP23017();
 
    void pinMode(uint8_t p, uint8_t d);
    void digitalWrite(uint8_t p, uint8_t d);
    void pullUp(uint8_t p, uint8_t d);
    uint8_t digitalRead(uint8_t p);
 
    void writeGPIOAB(uint16_t);
    uint16_t readGPIOAB();
    uint8_t readGPIO(uint8_t b);
 
    void setupInterrupts(uint8_t mirroring, uint8_t open, uint8_t polarity);
    uint8_t getLastInterruptPin();
    uint8_t getLastInterruptPinValue();
 
private:
    uint8_t bitForPin(uint8_t pin);
    uint8_t regForPin(uint8_t pin, uint8_t portAaddr, uint8_t portBaddr);
 
    uint8_t readRegister(uint8_t addr);
    void writeRegister(uint8_t addr, uint8_t value);
 
    void updateRegisterBit(uint8_t p, uint8_t pValue, uint8_t portAaddr, uint8_t portBaddr);
 
    uint8_t m_i2caddr;
    i2c_port_t m_port;
    gpio_num_t m_sda;
    gpio_num_t m_scl;
 
    std::mutex m_mutex;
};
 
#endif