#ifndef __AMS_20x4LCD_HPP__
#define __AMS_20x4LCD_HPP__

#include <stdint.h>
#include <Arduino.h>

//https://electronicsforu.com/resources/learn-electronics/16x2-lcd-pinout-diagram
// Most LCDs contain Hitachi HD4478 controller.
// Arduino may already have a driver for this, but I need to learn
// to write my own drivers.

class lcd20x4
{
public:

  lcd20x4();
  ~lcd20x4();

  uint8_t cursx,cursy;

  void setup(uint8_t RSpin, uint8_t RWpin, uint8_t Epin, const uint8_t* DBpins);
  void loop();

  //11 pin control for 16-pin LCD screen
  uint8_t pin_RS;    //pin 4 register-select
    //-0 instruction register (read), 1 data register (read/write)
  uint8_t pin_RW;    //pin 5 (read-write)
    //-0 write, 1 read
  uint8_t pin_E;     //pin 6 enable
    //high - enable read/write (clock for read/write?)
  uint8_t pin_DB[8]; //pins 7-14 on LCD
    //data bus

  //blocking read/write operations
  uint8_t read_op(uint8_t b, uint8_t RS);
  void write_op(uint8_t b, uint8_t RS);

  //control commands
  void display_clear();
  void cursor_home();
  void entrymode(bool ID, bool S); //cursor advance direction and shift mode
    //I/D - 1:increment/0:decrement S:1 display shift 0:cursor shift?
  void display_toggle(bool display, bool cursor, bool charblink);
  void cursor_shift(bool screen_cursor, bool left_right);

  void CGRAM_set(uint8_t Acg_6bits); //sets CGRAM address - subsequent data is CG data
    //user generated characters
  void DDRAM_set(uint8_t Add_7bits); //sets DDRAM address - subsequent data is DD data
    //00 - 4F (when display not shifted)

  //DL: data length: 0 - 4-bit, 1 - 8-bit
  //N: display lines: 0 - 1-line-mode 1 - 2-line-mode
  //F: font: 0 - 5x8 1 - 5x10
  void function_set(bool DL,bool N,bool F);

  

  //D: display
  //C: cursor
  //B: blink
  void displayonoff(bool D, bool C, bool B);



  void setmydefs(); //sets reasonable screen defaults and clears screen
  //writes a char and advances cursor

  void set_pos(uint8_t x, uint8_t y);
  void write_char(char b, uint8_t x, uint8_t y);
  void write_char(char b);
  //clears screen and writes a string (32 bytes max)
  void write_chars(const char *bytes);
  void newline();


};

#endif