Adafruit_I2C_LCD_Backpack.hh

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#ifndef COSA_ADAFRUIT_I2C_LCD_BACKPACK_HH
#define COSA_ADAFRUIT_I2C_LCD_BACKPACK_HH

#include <HD44780.h>
#include <MCP23008.h>

class Adafruit_I2C_LCD_Backpack : public HD44780::IO, private MCP23008 {
public:
  Adafruit_I2C_LCD_Backpack(uint8_t subaddr = 0) :
    MCP23008(subaddr),
    m_port()
  {}

  virtual bool setup();

  virtual void write4b(uint8_t data);

  virtual void write8b(uint8_t data);

  virtual void write8n(const void* buf, size_t size);

  virtual void set_mode(uint8_t flag);

  virtual void set_backlight(uint8_t flag);

protected:
  static const uint8_t TMP_MAX = 32;

  union port_t {
    uint8_t as_uint8;           
    struct {
      uint8_t nc:1;             
      uint8_t rs:1;             
      uint8_t en:1;             
      uint8_t data:4;           
      uint8_t bt:1;             
    };
    operator uint8_t()
    {
      return (as_uint8);
    }
    port_t()
    {
      as_uint8 = 0;
    }
  };
  port_t m_port;                
};

#endif