hd44780.h

#ifndef __HD44780_H
#define __HD44780_H
/*NB_REVISION*/
 
/*NB_COPYRIGHT*/
 
#include <predef.h>
 
class HD44780_LCD_Bus
{
    volatile uint8_t bus[2];
    class reg
    {
        uint8_t addr;
        volatile uint8_t *lcd;
 
       public:
        reg(uint8_t addr, volatile uint8_t *lcd) : addr(addr), lcd(lcd) {}
        operator uint8_t() { return read(); }
        uint8_t operator=(uint8_t val)
        {
            write(val);
            return val;
        }
 
        uint8_t read() { return lcd[addr]; }
        void write(uint8_t val)
        {
            while (lcd[0] & 0x80)
            {
                asm("dsb");
            }
            lcd[addr] = val;
        }
    };
 
   public:
    HD44780_LCD_Bus();
 
    void init(uint8_t cols, uint8_t rows);
    void putchar(char c);
    void putstr(const char *str);
    void setCursor(int row, int col);
    void clr();
 
    reg operator[](int i) { return reg(i & 0x1, bus); }
    friend class HD44780_LCD;
};
 
class HD44780_LCD
{
   public:
    enum cursorDisp_t
    {
        CURSOR_OFF = 0,
        CURSOR_ON = 2,
        CURSOR_BLINK = 3
    };
 
   private:
    HD44780_LCD_Bus &bus;
    uint8_t cols;
    uint8_t rows;
    cursorDisp_t cursorDisp;
    bool dispState;
 
   public:
    HD44780_LCD(HD44780_LCD_Bus &bus, uint8_t cols, uint8_t rows);
 
    void init() { bus.init(cols, rows); }
    void putchar(char c) { bus.putchar(c); }
    void putstr(const char *str) { bus.putstr(str); }
    void setCursor(int row, int col) { bus.setCursor(row, col); }
    void enableCursor(cursorDisp_t disp);
    void enableDisplay(bool enable);
    void clr();
 
    HD44780_LCD_Bus::reg operator[](int i) { return bus[i]; }
};
 
#endif /* ----- #ifndef __HD44780_H  ----- */