/*
 *  lcd.h
 *
 *  Created by Michael Köhler on 22.12.16.
 *  Copyright 2016 Skie-Systems. All rights reserved.
 *
 *  lib for OLED-Display with SSD1306-Controller
 *  first dev-version only for I2C-Connection
 *  at ATMega328P like Arduino Uno
 ****************************************************
 *  For other Atmegas/Attinys: GFX-Lib needs a 
 *  minimum of 1029 byte SRAM!
 ****************************************************
 *
 */

#ifndef LCD_H
#define LCD_H

#ifndef YES 
#define YES				1
#define NO				0
#else

#error "Check #defines for YES and NO in other sources !"
#endif

#if (__GNUC__ * 100 + __GNUC_MINOR__) < 303
#error "This library requires AVR-GCC 3.3 or later, update to newer AVR-GCC compiler !"
#endif

#include <inttypes.h>
#include <avr/io.h>
#include <avr/pgmspace.h>

#define SDA_Pin			PC4
#define SDC_Pin			PC5
#define LCD_PORT		PORTC
#define LCD_PORT_DDR	DDRC

#define LCD_I2C_ADDR	0x78	// refer lcd-manual, 0x78 for 8-bit-adressmode, 
								//					 0x3c for 7-bit-adressmode
#define LCD_INIT_I2C	YES		// init I2C via lcd-lib
#define F_I2C			400000UL// clock i2c
#define PSC_I2C			1		// pprescaler i2c
#define SET_TWBR		(F_CPU/F_I2C-16UL)/(PSC_I2C*2UL)

#define LCD_DISP_OFF	0xAE
#define LCD_DISP_ON		0xAF

#define WHITE			0x01
#define BLACK			0x00

#define DISPLAY_WIDTH	128
#define DISPLAY_HEIGHT	64
#define DISPLAYSIZE		DISPLAY_WIDTH*DISPLAY_HEIGHT/8	// 8 pages/lines with 128 
														// 8-bit-column: 128*64 pixel
														// 1024 bytes


void i2c_init(void);						// init hw-i2c
void lcd_send_i2c_start(void);				// send i2c_start_condition
void lcd_send_i2c_stop(void);				// send i2c_stop_condition
void lcd_send_i2c_byte(uint8_t byte);		// send data_byte

void lcd_init(uint8_t dispAttr);			// init display, 
											// attributes:	LCD_DISPLAY_ON,
											//				LCD_DISPLAY_OFF
void lcd_home(void);						// set cursor to (x,y) = (0,0)

void lcd_command(uint8_t cmd);				// transmit command to display
void lcd_data(uint8_t data);				// transmit data to display
void lcd_gotoxy(uint8_t x, uint8_t y);		// set curser at pos x, y. 
											// x means character, y means line 
											// (page, refer lcd manual)
void lcd_gotoxy_gfx(uint8_t x, uint8_t y);  // set cursor at pos x, y
void lcd_clrscr(void);						// clear screen
void lcd_putc(char c);						// print character on screen
void lcd_puts(const char* s);				// print string, \n-terminated, from ram on screen
void lcd_puts_p(const char* progmem_s);		// print string from flash on screen
void lcd_invert(uint8_t invert);			// invert display
uint8_t lcd_isInverted(void);				// returns YES if display is inverted
void lcd_set_contrast(uint8_t contrast);	// set contrast for display

void lcd_drawPixel(uint8_t x, uint8_t y, uint8_t color);
void lcd_drawLine(uint8_t x1, uint8_t y1, uint8_t x2, uint8_t y2, uint8_t color);
void lcd_drawRect(uint8_t px1, uint8_t py1, uint8_t px2, uint8_t py2, uint8_t color);
void lcd_fillRect(uint8_t px1, uint8_t py1, uint8_t px2, uint8_t py2, uint8_t color);
void lcd_drawCircle(uint8_t center_x, uint8_t center_y, uint8_t radius, uint8_t color);
void lcd_fillCircle(uint8_t center_x, uint8_t center_y, uint8_t radius, uint8_t color);
void lcd_display(void);						// copy buffer to display RAM
#endif /*  LCD_H  */