glcd.h

Graphical presentation with LCD

/*           GRAPHIC LCD 128*64 Controller with AVR microcontroller  (ATMEGA32     */

#define DISPLAY_ON         0x3f
#define DISPLAY_OFF        0x3e
#define DISPLAY_STARTLINE  0xc0
#define DISPLAY_PAGE_SET   0xb8
#define DISPLAY_COLUMN_SET 0x40
#define DATAREG 1    
#define CONTROL 0    
#define LCD_ENABLE      1   //                        Zero Bit
#define LCD_CS1         0   //                        1'st Bit
#define LCD_CS2         6   //                        2'nd Bit
#define LCD_inst        8   //  RS ( 4'th Pin)  ==>>  3'rd Bit

typedef unsigned char byte;
flash unsigned char value=0;
unsigned char CurrentColumn,DisplayData[8][128];

void OmaDelay(void){
delay_us(1);     
}


void output(int port, unsigned char value){
//unsigned char temp;
if(port) DATAPORT=value;
else{
	if(value&1) value&=0XFE; else value|=1;
	if(value&2) value&=0XFD; else value|=2;
	if(value&8) value&=0XF7; else value|=8;
	CTRLPORT=value;     
	}
}



void SendLCDCommand(byte value, byte CS)
{  
	output(CONTROL,  CS | LCD_inst);
	OmaDelay();
	output(DATAREG, value);
	OmaDelay();
	output(CONTROL, LCD_ENABLE | CS | LCD_inst);
	OmaDelay();
	OmaDelay();
	}


void SendLCDData(flash unsigned char values[], unsigned int amount){
byte c_s;
unsigned int counter;
for (counter=0; counter < amount;counter++){
	c_s = CurrentColumn>63?LCD_CS2:LCD_CS1;
	output(CONTROL, c_s ); 
	OmaDelay();
	output(DATAREG, values[counter]); 
	OmaDelay();
	output(CONTROL, LCD_ENABLE | c_s );
	OmaDelay();
	CurrentColumn++;
	if (CurrentColumn > 127)  return;
	}
}


void sendlcddataram(unsigned char values){
byte c_s;
c_s = CurrentColumn>63?LCD_CS2:LCD_CS1;
output(CONTROL, c_s );   
OmaDelay();
output(DATAREG,values); 
OmaDelay();
output(CONTROL, LCD_ENABLE | c_s ); 
OmaDelay();
}






 
void SetColumn(unsigned char y){
CurrentColumn = y;
if (y < 64){
	SendLCDCommand(DISPLAY_COLUMN_SET | (y&63), LCD_CS1);
	SendLCDCommand(DISPLAY_COLUMN_SET | 0, LCD_CS2);
	 }
else{
	SendLCDCommand(DISPLAY_COLUMN_SET | 63, LCD_CS1);
	SendLCDCommand(DISPLAY_COLUMN_SET | ((y-64)&63), LCD_CS2);
	 }
}




void SetPage(unsigned char x){
	SendLCDCommand(DISPLAY_PAGE_SET | x, LCD_CS1);
	SendLCDCommand(DISPLAY_PAGE_SET | x, LCD_CS2);
}


void SetStartLine(unsigned char line){
	SendLCDCommand(DISPLAY_STARTLINE | (line & 63), LCD_CS1);
	SendLCDCommand(DISPLAY_STARTLINE | (line & 63), LCD_CS2);
}

 	


void show(flash unsigned char * a,unsigned int delay){
unsigned char i,j;
unsigned int temp;
SetColumn(0);
SetPage(0);
for (j=0;j<8;j++){
	SetPage(j);
	SetColumn(0);
	for (i=0;i<128;i++){
		temp=(unsigned int)128*j;
		temp+=i;
		SendLCDData(&a[temp],1);
		delay_ms(delay);
		}
	}
}
                

void LCDprintf(unsigned char y, unsigned char page,  flash unsigned char *Str,...){
unsigned char n;
unsigned int yy;
SetColumn(y);
SetPage(page);
SetColumn(y);
for (n = 0;Str[n]!=0;n++){
	yy=(*(Str+n));
	yy*=8;
	SendLCDData(&Character8x8[yy], 8);
	}
}

void LCDprintf2(unsigned char y, unsigned char page,  flash unsigned char *Str,...){
unsigned char n;
unsigned int yy;
SetColumn(y);
SetPage(page);
SetColumn(y);
for (n = 0;Str[n]!=0;n++){
	yy=(*(Str+n)-32);
	yy*=5;
	SendLCDData(&font5x7[yy],5);
	SendLCDData(&value,1);
	}
}

  
void LCDprintf2Ram(unsigned char y, unsigned char page,unsigned char *Str,...){
unsigned char n;
unsigned int yy;
SetColumn(y);
SetPage(page);
SetColumn(y);
for (n = 0;Str[n]!=0;n++){
	yy=(*(Str+n)-32);
	yy*=5;
	SendLCDData(&font5x7[yy],5);
	SendLCDData(&value,1);
	}
}




void clear(void){
unsigned char x,a;
for (x=0;x < 8;x++){
  SetPage(x);SetColumn(0);
  for (a = 0 ;a < 128; a++)
	 SendLCDData(&value,1);
	 DisplayData[x][a]=0;
	  }
}

void on(void){ 
SendLCDCommand(DISPLAY_ON, LCD_CS1);
SendLCDCommand(DISPLAY_ON, LCD_CS2);
}

void off(void){
SendLCDCommand(DISPLAY_OFF, LCD_CS1);
SendLCDCommand(DISPLAY_OFF, LCD_CS2);
}


unsigned char pow2(unsigned char a,unsigned char b){
unsigned char i=0,ret=1;
for(;i<b;i++) ret*=a;
return ret;
}


/////////////////////////////////////////////

void putpixel(unsigned int x, unsigned int y){
	SetPage((x/8));
	SetColumn(y);
	DisplayData[x/8][y]|=pow2(2,x%8);
	sendlcddataram(DisplayData[x/8][y]);
}
 

void clrpixel(unsigned int x, unsigned int y){
	SetPage((x/8));
	SetColumn(y);
	DisplayData[x/8][y]&=~pow2(2,x%8);
	sendlcddataram(DisplayData[x/8][y]);
}

                          


void line(unsigned int Xa,unsigned int Ya,unsigned int Xb,unsigned int Yb){
float X,Y,Xinc,Yinc,m;
unsigned int i,step;
if((Xa>63)||(Xb>63)||(Ya>127)||(Yb>127)){
	LCDprintf2(0,0,"Out of Range!!");while(9);
	}
if(Xa<Xb){
	X=(float)Xa;
	Y=(float)Ya;
	}
else{
	X=(float)Xb;
	Y=(float)Yb;
	}
m=(float)fabs((float)Yb-(float)Ya)/fabs((float)Xb-(float)Xa);
if(m<=1){
	Xinc=1.0;
	step=abs(Xb-Xa);
	Yinc=m;
	}
else{
	Xinc=1.0/m;
	step=abs(Yb-Ya);
	Yinc=1.0;
	}
putpixel((int)X,(int)Y);
for(i=0;i<step;i++){
	X+=Xinc;
	if(((Xb>Xa)&&(Yb>Ya))||((Xb<Xa)&&(Yb<Ya)))
		Y+=Yinc;
	else
		Y-=Yinc;
	putpixel((int)X,(int)Y);
	}
}