AdafruitPCF8575ExpanderAdapter.h

#ifndef INPUT_EVENTS_ADAFRUIT_PCF8575_EXPANDER_ADAPTER_H
#define INPUT_EVENTS_ADAFRUIT_PCF8575_EXPANDER_ADAPTER_H
 
#include <Arduino.h>
#include <new>  // required for placement new on AVR
#include <Adafruit_PCF8575.h>
#include "GpioExpanderAdapter/GpioExpanderAdapter.h"
#include "PinAdapter/PinAdapter.h"
 
class AdafruitPCF8575ExpanderAdapter : public GpioExpanderAdapter {
 
public:
 
    AdafruitPCF8575ExpanderAdapter() {
        // We have to create the instance on the stack because Adafruit does 'clever' stuff with Wire and
        // tries to delete an instance that doesn't yet exist...
        //NOLINTNEXTLINE(cppcoreguidelines-owning-memory)
        pcf = new (&pcfStorage) Adafruit_PCF8575();
        ownsPcf = true;
    }
 
    AdafruitPCF8575ExpanderAdapter(Adafruit_PCF8575& _pcf)
        : pcf(&_pcf) 
        {}
 
    void begin() override {
        pcf->begin(); //Use defaults
        delayMicroseconds(400);
        pinStates = pcf->digitalReadWord();
    }
    
    bool begin(uint8_t i2c_addr, TwoWire *wire = &Wire) {
        bool ret = pcf->begin(i2c_addr, wire);
        delayMicroseconds(400);
        pinStates = pcf->digitalReadWord();
        return ret;
    }
    
 
    void update() override {
        pinStates = pcf->digitalReadWord();
    }
 
    void attachPin(byte pin, int mode = INPUT_PULLUP) override {
          pcf->pinMode(pin, mode);
    }
 
    bool read(byte pin) override {
        return bitRead(pinStates, pin);
    }
 
    bool updateAndRead(byte pin) {
        return pcf->digitalRead(pin);
    }
 
    void write(byte pin, bool state) {
        pcf->digitalWrite(pin, state);
    }
 
    bool canWrite() { return true; }
 
    virtual ~AdafruitPCF8575ExpanderAdapter() = default;
 
private:
    
    alignas(Adafruit_PCF8575) uint8_t pcfStorage[sizeof(Adafruit_PCF8575)]; 
    Adafruit_PCF8575* pcf = nullptr;
    bool ownsPcf = false;
    uint16_t pinStates = 0;
};
 
 
#endif