MCP23017.hpp

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#pragma once
 
#include "ExtendedInputOutput.hpp"
#include "StaticSizeExtendedIOElement.hpp"
#include <AH/Containers/BitArray.hpp>
 
BEGIN_AH_NAMESPACE

template <class WireType>
class MCP23017 : public StaticSizeExtendedIOElement<16> {
  public:
    MCP23017(WireType &wire, uint8_t addressOffset = 0,
             pin_t interruptPin = NO_PIN);
 
    void pinModeBuffered(pin_int_t pin, PinMode_t mode) override;
    void digitalWriteBuffered(pin_int_t pin, PinStatus_t status) override;
    PinStatus_t digitalReadBuffered(pin_int_t pin) override;
    analog_t analogReadBuffered(pin_int_t pin) override;
    void analogWriteBuffered(pin_int_t, analog_t) override;
 
    void begin() override;
 
    void updateBufferedOutputs() override;
    void updateBufferedInputs() override;
    void updateBufferedPinModes();

    pin_t pinA(pin_int_t p) { return pin(p); }
    pin_t pinB(pin_int_t p) { return pin(p + 8); }
 
  private:
    constexpr static uint8_t I2C_BASE_ADDRESS = 0x20;
 
    WireType *wire;
    uint8_t address;
    pin_t interruptPin;
 
  private:
    bool pinModesDirty = true;
    BitArray<16> bufferedPinModes;
    bool pullupsDirty = true;
    BitArray<16> bufferedPullups;
    bool outputsDirty = true;
    BitArray<16> bufferedOutputs;
    BitArray<16> bufferedInputs;
 
  private:
    bool hasInputs() const;

    template <size_t N>
    void writeI2C(const uint8_t (&values)[N]);

    template <class... Args>
    void writeI2C(uint8_t addr, Args... values);
};
 
END_AH_NAMESPACE
 
#include "MCP23017.ipp"