kindly help..i've been facing this problem for about 2 weeks. still i can't figure out. im using the PIC16F877A, IT works fine when i run it in simulator, but in actual only the 16 blocks of lcd appears. there's no character..here's my circuit http://img262.imageshack.us/i/uploadck.png/
and my code

// initialize function prototypes
void initializePorts();
void initializeLCD();
void startGame();
int checkForHit();
void updateScore(int playerFlag, int score);
void showWinner(int playerFlag);
int showMenu();

// function main
void main() {

 *// initialize components
	initializePorts();
	initializeLCD();

 *// start program proper
 *do {
 *	startGame();
 * } while( showMenu() );
} // end main

// start game proper
void startGame() {
 *int player1Score = 0;
	int player2Score = 0;
	int playerFlag = 1;		// who is playing
	int previousPlayer = 1;
	/*
		1 -> player 1
		2 -> player 2
	*/

	int yellowCtr = 0, greenCtr = 0, blueCtr = 0, redCtr = 0;
	int hitFlag = 0;
	/*
		1 -> yellow
		2 -> green
		3 -> blue
		4 -> red
		5 -> switch player
	*/

 *LCD_Cmd(LCD_CLEAR);

	do {
 * *hitFlag = 0;
 * *
 * *if( previousPlayer != playerFlag ) {
 * * * *previousPlayer = playerFlag;
 * *		yellowCtr = 0;
 * * * *greenCtr = 0;
 * *		blueCtr = 0;
 * *		redCtr = 0;
 * *		LCD_Cmd(LCD_CLEAR);
 * * * *Lcd_Out(1, 3, "CHANGE PLAYER");
 * * * *Delay_ms(1000);
 * * * *LCD_Cmd(LCD_CLEAR);
 * *}
 * *
 * *updateScore( playerFlag, playerFlag == 1? player1Score: player2Score );
 * *
		hitFlag = checkForHit(); // checks what color has been hit

		switch( hitFlag ) {
			case 1:					// yellow
				yellowCtr++;
				break;
			case 2:					// green
				greenCtr++;
				break;
			case 3:					// blue
				blueCtr++;
				break;
			case 4:					// red
				redCtr++;
				break;
			case 5: * * * * * * * * * * * * * * * * *// switch
 * * * *previousPlayer = playerFlag; * * * * * // set previous player
 * * * *playerFlag = playerFlag == 1? 2: 1; * *// switch player
				continue; * 			 * * * * * * * * * * // go back to the start of *"do-while" loop
		}

		if( yellowCtr >= 2 || greenCtr >= 2 || blueCtr >= 2 || redCtr >= 2 ) {
			switch( playerFlag ) {
				case 1:
					player1Score += 5;
					break;
				case 2:
					player2Score += 5;
					break;
			}

 * * *updateScore( playerFlag, playerFlag == 1? player1Score: player2Score );

		}

	} while( player1Score != 50 && player2Score != 50 ); // check for winner

	showWinner( playerFlag );
}

void showWinner( int playerFlag ) {
 * * int ctr;
 * * char *line1Text = "";
 * * 
 * * switch( playerFlag ) {
 * *		case 1:
 * *			strcpy(line1Text, "PLAYER 1 WINS!");
 * *			break;
 * *		case 2:
 * *			strcpy(line1Text, "PLAYER 2 WINS!");
 * *			break;
 *	 }

 * * for( ctr = 0; ctr < 7; ctr++ ) {
 * * * * *Lcd_Out(1,2,line1Text);
 * * * * *Delay_ms(400);
 * * * * *LCD_Cmd(LCD_CLEAR);
 * * * * *Delay_ms(400);
 * * }
}

int showMenu() {
 * * int hit = 0;

 * * LCD_Cmd(LCD_CLEAR);
 * * LCD_Out(1,1, " Press Any Key");
 * * LCD_Out(2,1, " To Start Game");

 * * hit = checkForHit();

 * * if( hit ) {
 * * * * LCD_Cmd(LCD_CLEAR);
 * * * * return 1;
 * * }

 * * return 0;
}

void updateScore( int playerFlag, int score ) {
	char *line1Text = "";
	char *line2Text = "";
	char scoreStr[7];

	LCD_Cmd(LCD_CLEAR);

	switch( playerFlag ) {
		case 1:
			strcpy(line1Text, "Player 1 Score");
			break;
		case 2:
			strcpy(line1Text, "Player 2 Score");
			break;
	}

 *IntToStr( score, scoreStr );
 *
	LCD_Out(1,1, line1Text);
	LCD_Out(2,4, scoreStr);

}

int checkForHit() {
	int hit = 0;

	do {
 * *// red
		if ( Button(&PORTD, 0, 100, 0) ) { *// detect one-to-zero transition on RD0 pin
			hit = 4;
		}

		//for green
		if ( Button(&PORTD, 1, 100, 0) ) { *// detect one-to-zero transition on RD1 pin
			hit = 2;
		}

		//for blue
		if ( Button(&PORTD, 2, 100, 0) ) { *// detect one-to-zero transition on RD2 pin
			hit = 3;
		}

		//for yellow
		if ( Button(&PORTD, 3, 100, 0) ) { *// detect one-to-zero transition on RD3 pin
			hit = 1;
		}

		//for Switch player button
		if ( Button(&PORTD, 4, 100, 0) ) { *// detect one-to-zero transition on RD4 pin
			hit = 5;
		}

	} while( !hit ); // it will just exit if hit != 0

	return hit; // return what has been hit
}

void initializePorts() {
	TRISB = 0;			// output
	 * * * * * * * // initialize PORTB

	TRISD = 1;			// input
	PORTD = 0xFF;		// initialize PORTD

}

void initializeLCD() {
	Lcd_Init(&PORTB); * * * * * * // Lcd initialization with default settings

	LCD_Cmd(LCD_CLEAR); * * * * * // Clear display
	LCD_Cmd(LCD_CURSOR_OFF); * * *// Turn cursor off
 *Lcd_Out(1, 4, "Let's Play");
 *Delay_ms(1000);
 *LCD_Cmd(LCD_CLEAR);
}

thanks in advance..

 

I guess that belongs to general electronics or project help... Unless the OP says it's homework.

 

If your probelm is with displaying something to the LCD then post some simple code that does that. Something like displaying "Hello World". Please don't expect forum memembers to wade through all of your code that has nothing to do with the problem. A simple program may help you solve the problem on your own.

Search this forum. This problem has been discussed many, many times.


Check your suppy volatges on the LCD.

Single step through your code and make sure all the bits are being set on the LCD the way you expect.

Check your contrast on VO pin.

 

If you plug in an LCD to power, and give it no initialization or signals, it will be a row of blocks on the top row and a blank bottom row. Sort of a self test thingy.

Check your wiring on the LCD ports, I'm having issues reading your code due to the number of asterisks.

 

You're missing a contrast pot on the LCD and 0.1uF decoupling caps.