SR3W.h

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#ifndef LCD_ADAPTER_SR3W_H
#define LCD_ADAPTER_SR3W_H

#include "LCD.h"
#include "Driver/HD44780.h"
#include "GPIO.h"

namespace LCD {
template<BOARD::pin_t SDA_PIN, BOARD::pin_t SCL_PIN, BOARD::pin_t EN_PIN>
class SR3W : public HD44780::Adapter {
public:
  SR3W() :
    HD44780::Adapter(),
    m_port()
  {
    m_sda.output();
    m_scl.output();
    m_en.output();
  }

  virtual bool setup()
  {
    return (false);
  }

  virtual void write4b(uint8_t data)
  {
    m_port.data = data;
    data = m_port;
    uint8_t mask = 0x20;
    do {
      m_sda = data & mask;
      m_scl.toggle();
      mask >>= 1;
      m_scl.toggle();
    } while (mask);
    m_en.toggle();
    m_en.toggle();
  }

  virtual void write8b(uint8_t data)
  {
    write4b(data >> 4);
    write4b(data);
    delayMicroseconds(SHORT_EXEC_TIME);
  }

  virtual void set_mode(uint8_t flag)
  {
    m_port.rs = flag;
  }

  virtual void set_backlight(uint8_t flag)
  {
    m_port.bt = flag;
  }

protected:
  static const uint16_t SHORT_EXEC_TIME = 32;

  union port_t {
    uint8_t as_uint8;           
    struct {
      uint8_t data:4;           
      uint8_t rs:1;             
      uint8_t bt:1;             
      uint8_t app2:1;           
      uint8_t app1:1;           
    };
    operator uint8_t() { return (as_uint8); }
    port_t() { as_uint8 = 0; }
  };

  port_t m_port;                
  GPIO<SDA_PIN> m_sda;          
  GPIO<SCL_PIN> m_scl;          
  GPIO<EN_PIN> m_en;            
};
};
#endif