SR4W.h

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#ifndef LCD_ADAPTER_SR4W_H
#define LCD_ADAPTER_SR4W_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,
         BOARD::pin_t BT_PIN>
class SR4W : public HD44780::Adapter {
public:
  SR4W() :
    HD44780::Adapter(),
    m_rs(0)
  {
    m_sda.output();
    m_scl.output();
    m_en.output();
    m_bt.output();
  }

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

  virtual void write4b(uint8_t data)
  {
    write8b(data);
  }

  virtual void write8b(uint8_t data)
  {
    uint8_t mask = 0x80;
    do {
      m_sda = data & mask;
      m_scl.toggle();
      mask >>= 1;
      m_scl.toggle();
    } while (mask);
    m_sda = m_rs;
    m_en.toggle();
    m_en.toggle();
    delayMicroseconds(SHORT_EXEC_TIME);
  }

  virtual void set_mode(uint8_t flag)
  {
    m_rs = flag;
  }

  virtual void set_backlight(uint8_t flag)
  {
    m_bt.write(flag);
  }

protected:
  static const uint16_t SHORT_EXEC_TIME = 30;

  GPIO<SDA_PIN> m_sda;          
  GPIO<SCL_PIN> m_scl;          
  GPIO<EN_PIN> m_en;            
  GPIO<BT_PIN> m_bt;            
  uint8_t m_rs;                 
};

};
#endif