lcd1602.cpp

#include "lcd1602.h"
#include "define.h"

uint8_t display_function;
uint8_t numlines;
uint8_t display_control;
uint8_t display_mode;

void initLCD(uint8_t bitmode)
{
	if (bitmode) display_function = FULL_DATA_BUS | ONE_ROW | FONT_5_7_STYLE;
	else display_function = HALF_DATA_BUS | ONE_ROW | FONT_5_7_STYLE;
	beginLCD(16, 1, FONT_5_7_STYLE);
	
}

void beginLCD(uint8_t columns, uint8_t rows, uint8_t dot_style)
{
	if (rows > 1) display_function |= DOUBLE_ROW;
	numlines = rows;
	
	_delay_us(50000);
	RS_LOW
	ENABLE_LOW
	WRITE_ON
	
	commandSet(FUNCTION_SET | display_function);
	_delay_us(4500);
	commandSet(FUNCTION_SET | display_function);
	_delay_us(150);
	commandSet(FUNCTION_SET | display_function);
	commandSet(FUNCTION_SET | display_function);

	display_control = DISPLAY_ON | CURSOR_OFF | BLINK_OFF;
	displaySwitch(ON);
	screenClear();

	display_mode = LCD_ENTRYLEFT | LCD_ENTRYSHIFTDECREMENT;
	commandSet(LCD_ENTRYMODESET | display_mode);
	

}

void blinkOn(uint8_t state)
{
	display_control |= (state ? BLINK_ON : BLINK_OFF);
	commandSet(LCD_DISPLAYCONTROL | display_control);

}

uint8_t readBusyFlag(void)
{
	return 0;
}

uint8_t readInstruction(uint8_t command)
{
	return 0;
}

void writeData(uint8_t data)
{
	RS_HIGH
	ENABLE_LOW
	WRITE_ON
	*(volatile uint8_t*)(0x2B) = data;
	pulseEnable();
}

uint8_t readData(uint8_t data)
{
	return 0;
}

void screenClear(void)
{
	commandSet(SCREEN_CLEAR);
	_delay_us(2000);
}

void cursorReturn(void)
{


}

void displaySwitch(uint8_t state)
{
	display_control |= (state ? DISPLAY_ON : DISPLAY_OFF);
	commandSet(DISPLAY_SWITCH | display_control);
}

void shift(uint8_t flags)
{


}

void commandSet(uint8_t flags)
{
	RS_LOW
	ENABLE_LOW
	WRITE_ON
	*(volatile uint8_t*)(0x2B) = flags;
	pulseEnable();
}

void pulseEnable(void)
{
	ENABLE_LOW
	_delay_us(1);
	ENABLE_HIGH
	_delay_us(1);
	ENABLE_LOW
	_delay_us(100);
}

void setCursor(uint8_t column, uint8_t row)
{
	switch(row)
	{
		case 0:
		commandSet(LCD_SETDDRAMADDR | column);
		break;

		case 1:
		commandSet(LCD_SETDDRAMADDR | 0x40 | column);
		break;
	}
}

void printChar(uint8_t character)
{
	writeData(character);
}

void printInt(int16_t val)
{
	if (val < 0)
	{
		writeData('-');
		val = -val;
	}
	if (val / 10)
	{
		printInt(val / 10);
	}
	writeData(val % 10 + '0');
	//_delay_us(500);
}

void printString(const char *string)
{
	while(*string) 
	{
		writeData(*string);
		string++;
	}

}