lcd_driver.c

Automatic Temperature Controlled Fan With PWM Conrol in Keil

#define DISPLAY_ON 		0XC
#define RETURN_HOME 	0X2
#define FUNCTION_SET 	0X38
#define ENTRY_MODE1 	0X6
#define ENTRY_MODE2 	0X6
#define CLEAR_DISPLAY 	0X1
#define DISPLAY_OFF 	0X8
#define LINE1			0x80
#define LINE2			0xC0

#define DataPort 		P2


sbit RS = P0^2;
//sbit RW = P0^1;
sbit E  = P0^3;


void msec(int delay)
{
	int i,j;
	for (j=0;j<delay;j++)
	for (i=0;i<500;i++);
}

void lcd_cmdwr(unsigned char Command)
{
	RS=0;
	msec(1);
	E=1;
	msec(2);
	DataPort=Command;
	msec(2);
	E=0;
	msec(5);
}

void Initialize(void)
{
	msec(15);
	RS=0;
//	RW=0;
	msec(1);
	DataPort=0;
	lcd_cmdwr(FUNCTION_SET);
	lcd_cmdwr(FUNCTION_SET);
	lcd_cmdwr(FUNCTION_SET);
	lcd_cmdwr(CLEAR_DISPLAY);
	lcd_cmdwr(DISPLAY_OFF);
	lcd_cmdwr(DISPLAY_ON);
	lcd_cmdwr(CLEAR_DISPLAY);
	lcd_cmdwr(ENTRY_MODE1);
	lcd_cmdwr(CLEAR_DISPLAY);
	lcd_cmdwr(RETURN_HOME);
}

void lcd_dwr(unsigned char Data)
{
	RS=1;
	msec(1);
	E=1;
	msec(2);
	DataPort=Data;
	E=0;
	msec(5);
}

void SendLCDString(char *String )
{
	unsigned int i;
	for(i=0;i<strlen(String);i++)
	{msec(10);lcd_dwr(String[i]);}	
}