/*
 * tinyi2c.c for st7032i splc792a lcd controler
 * 
 * Created: 2015/07/31 7:48:14
 *  Author: www.henteko.org
 */ 
#include <util/delay.h>
#include "i2c_lcd.h"

void i2c_delay_ms(unsigned int t) {
	while(t--)
		_delay_ms(1);
}

void i2c_delay_us(unsigned int t) {
	while(t--)
		_delay_us(1);
}

void i2c_lcd_cmd(unsigned char cmd) {
	TinyI2C_start();
	TinyI2C_write(LCD_ST7032_SEND);
	TinyI2C_write(0x00);
	TinyI2C_write(cmd);
	TinyI2C_stop();
	i2c_delay_us(27);
}

void i2c_lcd_putch(unsigned char chr) {
	TinyI2C_start();
	TinyI2C_write(LCD_ST7032_SEND);
	TinyI2C_write(0x40);
	TinyI2C_write(chr);
	TinyI2C_stop();
	i2c_delay_us(27);
}

void i2c_lcd_goto(unsigned char line, unsigned char pos) {
	pos += 0x80;
	i2c_lcd_cmd(0b00111000);			// function set 0
	if(line == 1)
		pos += 0x40;
	i2c_lcd_cmd(pos);
}

void i2c_lcd_clear(void) {
	i2c_lcd_cmd(0b00000001);
}

void i2c_lcd_cursor(unsigned char mode) {
	i2c_lcd_cmd(0b00001100 | (mode & 0x3));
}

void i2c_lcd_init(unsigned char cont) {
	i2c_delay_ms(40);
	i2c_lcd_cmd(0b00111000); 	// function set 0
	i2c_lcd_cmd(0b00111001); 	// function set 1
	i2c_lcd_cmd(0b00010100); 	// internal OSC frequency set
	i2c_lcd_cmd(0b01110000 | (cont & 0xF));			// contrast set
	i2c_lcd_cmd(0b01011100 | ((cont >> 4) & 0x3));	// power/icon/contrast control
	i2c_lcd_cmd(0b01101100); 	// follower control
	i2c_delay_ms(200);

	i2c_lcd_cmd(0b00111000); 	// function set 0
	i2c_lcd_cmd(0b00001100); 	// display on
	
	i2c_lcd_cmd(0b00000001); 	// display clear
	i2c_delay_ms(2);
}

void i2c_lcd_contrast(unsigned char level) {
	i2c_lcd_cmd(0b00111001);						// function set 1
	i2c_lcd_cmd(0b01110000 | (level & 0xF));		// contrast set
	i2c_lcd_cmd(0b01011100 | ((level >> 4) & 0x3)); // power/icon/contrast control
	i2c_lcd_cmd(0b01101100); 						// follower control
	i2c_delay_ms(200);

	i2c_lcd_cmd(0b00111000); 						// function set 0
}