AdafruitMCP23017ExpanderAdapter.h

// #ifdef __ADAFRUIT_MCP23XXX_H__
 
#ifndef INPUT_EVENTS_ADAFRUIT_MCP23017_EXPANDER_ADAPTERCP_H
#define INPUT_EVENTS_ADAFRUIT_MCP23017_EXPANDER_ADAPTERCP_H
 
#include <Arduino.h>
#include <new>
#include <Adafruit_MCP23X17.h>
#include "GpioExpanderAdapter/GpioExpanderAdapter.h"
#include "PinAdapter/PinAdapter.h"
 
class AdafruitMCP23017ExpanderAdapter : public GpioExpanderAdapter {
 
public:
 
    AdafruitMCP23017ExpanderAdapter() {
        // We have to create the instance on the stack because Adafruit does interesting stuff with Wire and
        // tries to delete an instance that doesn't yet exist...
        //NOLINTNEXTLINE(cppcoreguidelines-owning-memory)
        mcp = new (&mcpStorage) Adafruit_MCP23X17();
    }
 
    AdafruitMCP23017ExpanderAdapter(Adafruit_MCP23X17& _mcp)
        : mcp(&_mcp)
        {}
 
    void begin() override {
        mcp->begin_I2C(); //The default
        delayMicroseconds(400);
        pinStates = mcp->readGPIOAB();
    }
    
    bool begin(uint8_t i2c_addr, TwoWire *wire = &Wire) {
        bool ret = mcp->begin_I2C(i2c_addr, wire);
        delayMicroseconds(400);
        pinStates = mcp->readGPIOAB();
        return ret;
    }
    
 
    void update() override {
        pinStates = mcp->readGPIOAB();
    }
 
    void attachPin(byte pin, int mode = INPUT_PULLUP) override {
          mcp->pinMode(pin, mode);
    }
 
    bool read(byte pin) override {
        return bitRead(pinStates, pin);
    }
 
    bool updateAndRead(byte pin) {
        return mcp->digitalRead(pin);
    }
 
    void write(byte pin, bool state) {
        mcp->digitalWrite(pin, state);
    }
 
    bool canWrite() { return true; }
 
    virtual ~AdafruitMCP23017ExpanderAdapter() = default;
 
    private:
 
    alignas(Adafruit_MCP23X17) uint8_t mcpStorage[sizeof(Adafruit_MCP23X17)]; 
    Adafruit_MCP23X17* mcp;
    uint16_t pinStates = 0;
};
 
 
#endif
// #endif