lcd.c

Using LCD4bit for ATMEGA8535

#include <avr/io.h>
#include <avr/pgmspace.h>
#include <util/delay.h>
#include "lcd_lib.h"
#include <inttypes.h>

const uint8_t LcdCustomChar[] PROGMEM=//define 8 custom LCD chars
{
	0x00, 0x1F, 0x00, 0x00, 0x00, 0x00, 0x1F, 0x00, // 0. 0/5 full progress block
	0x00, 0x1F, 0x10, 0x10, 0x10, 0x10, 0x1F, 0x00, // 1. 1/5 full progress block
	0x00, 0x1F, 0x18, 0x18, 0x18, 0x18, 0x1F, 0x00, // 2. 2/5 full progress block
	0x00, 0x1F, 0x1C, 0x1C, 0x1C, 0x1C, 0x1F, 0x00, // 3. 3/5 full progress block
	0x00, 0x1F, 0x1E, 0x1E, 0x1E, 0x1E, 0x1F, 0x00, // 4. 4/5 full progress block
	0x00, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x00, // 5. 5/5 full progress block
	0x03, 0x07, 0x0F, 0x1F, 0x0F, 0x07, 0x03, 0x00, // 6. rewind arrow
	0x18, 0x1C, 0x1E, 0x1F, 0x1E, 0x1C, 0x18, 0x00  // 7. fast-forward arrow
};


void LCDsendChar(uint8_t ch)		//Sends Char to LCD
{
	LDP=(ch&0b11110000);
	LCP|=1<<LCD_RS;
	LCP|=1<<LCD_E;		
	_delay_ms(1);
	LCP&=~(1<<LCD_E);	
	LCP&=~(1<<LCD_RS);
	_delay_ms(1);
	LDP=((ch&0b00001111)<<4);
	LCP|=1<<LCD_RS;
	LCP|=1<<LCD_E;		
	_delay_ms(1);
	LCP&=~(1<<LCD_E);	
	LCP&=~(1<<LCD_RS);
	_delay_ms(1);
}

void LCDsendCommand(uint8_t cmd)	//Sends Command to LCD
{
	LDP=(cmd&0b11110000);
	LCP|=1<<LCD_E;		
	_delay_ms(1);
	LCP&=~(1<<LCD_E);
	_delay_ms(1);
	LDP=((cmd&0b00001111)<<4);	
	LCP|=1<<LCD_E;		
	_delay_ms(1);
	LCP&=~(1<<LCD_E);
	_delay_ms(1);
}

void LCDinit(void)//Initializes LCD
{
	_delay_ms(15);
	LDP=0x00;
	LCP=0x00;
	LDDR|=1<<LCD_D7|1<<LCD_D6|1<<LCD_D5|1<<LCD_D4;
	LCDR|=1<<LCD_E|1<<LCD_RW|1<<LCD_RS;
   //---------one------
	LDP=0<<LCD_D7|0<<LCD_D6|1<<LCD_D5|1<<LCD_D4; //4 bit mode
	LCP|=1<<LCD_E|0<<LCD_RW|0<<LCD_RS;		
	_delay_ms(1);
	LCP&=~(1<<LCD_E);
	_delay_ms(1);
	//-----------two-----------
	LDP=0<<LCD_D7|0<<LCD_D6|1<<LCD_D5|1<<LCD_D4; //4 bit mode
	LCP|=1<<LCD_E|0<<LCD_RW|0<<LCD_RS;		
	_delay_ms(1);
	LCP&=~(1<<LCD_E);
	_delay_ms(1);
	//-------three-------------
	LDP=0<<LCD_D7|0<<LCD_D6|1<<LCD_D5|0<<LCD_D4; //4 bit mode
	LCP|=1<<LCD_E|0<<LCD_RW|0<<LCD_RS;		
	_delay_ms(1);
	LCP&=~(1<<LCD_E);
	_delay_ms(1);
	//--------4 bit--dual line---------------
	LCDsendCommand(0b00101000);
   //-----increment address, invisible cursor shift------
	LCDsendCommand(0b00001100);
		//init 8 custom chars
	uint8_t ch=0, chn=0;
	while(ch<64)
	{
		LCDdefinechar((LcdCustomChar+ch),chn++);
		ch=ch+8;
	}
}			

void LCDclr(void)				//Clears LCD
{
	LCDsendCommand(1<<LCD_CLR);
}

void LCDhome(void)			//LCD cursor home
{
	LCDsendCommand(1<<LCD_HOME);
}

void LCDstring(uint8_t* data, uint8_t nBytes)	//Outputs string to LCD
{
register uint8_t i;

	// check to make sure we have a good pointer
	if (!data) return;

	// print data
	for(i=0; i<nBytes; i++)
	{
		LCDsendChar(data[i]);
	}
}

void LCDGotoXY(uint8_t x, uint8_t y)	//Cursor to X Y position
{
	register uint8_t DDRAMAddr;
	// remap lines into proper order
	switch(y)
	{
	case 0: DDRAMAddr = LCD_LINE0_DDRAMADDR+x; break;
	case 1: DDRAMAddr = LCD_LINE1_DDRAMADDR+x; break;
	case 2: DDRAMAddr = LCD_LINE2_DDRAMADDR+x; break;
	case 3: DDRAMAddr = LCD_LINE3_DDRAMADDR+x; break;
	default: DDRAMAddr = LCD_LINE0_DDRAMADDR+x;
	}
	// set data address
	LCDsendCommand(1<<LCD_DDRAM | DDRAMAddr);
	
}
//Copies string from flash memory to LCD at x y position
//const uint8_t welcomeln1[] PROGMEM="AVR LCD DEMO\0";
//CopyStringtoLCD(welcomeln1, 3, 1);	

void CopyStringtoLCD(const uint8_t *FlashLoc, uint8_t x, uint8_t y)
{
	uint8_t i;
	LCDGotoXY(x,y);
	for(i=0;(uint8_t)pgm_read_byte(&FlashLoc[i]);i++)
	{
		LCDsendChar((uint8_t)pgm_read_byte(&FlashLoc[i]));
	}
}

void LCDdefinechar(const uint8_t *pc,uint8_t char_code){
	uint8_t a, pcc;
	uint16_t i;
	a=(char_code<<3)|0x40;
	for (i=0; i<8; i++){
		pcc=pgm_read_byte(&pc[i]);
		LCDsendCommand(a++);
		LCDsendChar(pcc);
		}
}

void LCDshiftLeft(uint8_t n)	//Scrol n of characters Right
{
	for (uint8_t i=0;i<n;i++)
	{
		LCDsendCommand(0x1E);
	}
}

void LCDshiftRight(uint8_t n)	//Scrol n of characters Left
{
	for (uint8_t i=0;i<n;i++)
	{
		LCDsendCommand(0x18);
	}
}

void LCDcursorOn(void) //displays LCD cursor
{
	LCDsendCommand(0x0E);
}

void LCDcursorOnBlink(void)	//displays LCD blinking cursor
{
	LCDsendCommand(0x0F);
}

void LCDcursorOFF(void)	//turns OFF cursor
{
	LCDsendCommand(0x0C);
}

void LCDblank(void)		//blanks LCD
{
	LCDsendCommand(0x08);
}

void LCDvisible(void)		//Shows LCD
{
	LCDsendCommand(0x0C);
}

void LCDcursorLeft(uint8_t n)	//Moves cursor by n poisitions left
{
	for (uint8_t i=0;i<n;i++)
	{
		LCDsendCommand(0x10);
	}
}

void LCDcursorRight(uint8_t n)	//Moves cursor by n poisitions left
{
	for (uint8_t i=0;i<n;i++)
	{
		LCDsendCommand(0x14);
	}
}

//adapted fro mAVRLIB
void LCDprogressBar(uint8_t progress, uint8_t maxprogress, uint8_t length)
{
	uint8_t i;
	uint16_t pixelprogress;
	uint8_t c;

	// draw a progress bar displaying (progress / maxprogress)
	// starting from the current cursor position
	// with a total length of "length" characters
	// ***note, LCD chars 0-5 must be programmed as the bar characters
	// char 0 = empty ... char 5 = full

	// total pixel length of bargraph equals length*PROGRESSPIXELS_PER_CHAR;
	// pixel length of bar itself is
	pixelprogress = ((progress*(length*PROGRESSPIXELS_PER_CHAR))/maxprogress);
	
	// print exactly "length" characters
	for(i=0; i<length; i++)
	{
		// check if this is a full block, or partial or empty
		// (u16) cast is needed to avoid sign comparison warning
		if( ((i*(uint16_t)PROGRESSPIXELS_PER_CHAR)+5) > pixelprogress )
		{
			// this is a partial or empty block
			if( ((i*(uint16_t)PROGRESSPIXELS_PER_CHAR)) > pixelprogress )
			{
				// this is an empty block
				// use space character?
				c = 0;
			}
			else
			{
				// this is a partial block
				c = pixelprogress % PROGRESSPIXELS_PER_CHAR;
			}
		}
		else
		{
			// this is a full block
			c = 5;
		}
		
		// write character to display
		LCDsendChar(c);
	}

}


//Strings stored in AVR Flash memory
const uint8_t LCDwelcomeln1[] PROGMEM="LCD 4-bit\0";
const uint8_t LCDname[] PROGMEM="by: Anggriawan W\0";

//delay 1s
void delay1s(void)
{
	uint8_t i;
	for(i=0;i<100;i++)
	{
		_delay_ms(10);
	}
}

void character (void)
{
	LCDclr();
	CopyStringtoLCD(LCDwelcomeln1, 4, 0);
	delay1s();
	CopyStringtoLCD(LCDname, 0, 1);
	delay1s();
	
}	
	
	
int main(void)
{
	LCDinit();//init LCD bit, dual line, cursor right
	LCDclr();//clears LCD
	while(1)
	{
		character();
		delay1s();
	}
	return 0;
}