MSP430FR5739: 16x2 LCD Interfacing Problem

Hardware:- (MP430FR5739) (LCD :- 1602a)

Software :-  CCS 7.1

Problem :-

one (some time both lines) line of LCD display shows black boxes – I was struggling with this one.

I checked my wiring Diagram many time It's 100% same to below diagram

P1.0 => P1.7   (D0 to D7 Data line)

P2.2 => Enable

P2.1=> RS

V0 => pot middle  (10K )

Vss and  K => ground

Vdd and  A = > +5v

also i tried to use external power supply but result was same.

But is my simulation it's work fine.

Here is my code

#include  "stdio.h"
#include  "string.h"
#include "stdlib.h"
#define delay_value 500
 
void send_cmd(unsigned char command)
{
 
 P1OUT &= 0X00;
 P2OUT &= 0X00;
 P1OUT = command;
 P2OUT &= 0X00;
    P2OUT &= ~BIT1;                        // RS = 0 for command, P1.6 0x40
    //RW is grounded
    P2OUT &= ~BIT2;                        //EN = 0, P1.7, 0x80
    __delay_cycles(delay_value);
    P2OUT |= BIT2;                        // EN = 1, P1.7, 0x80
    __delay_cycles(delay_value);
    P2OUT &= ~BIT2;                        //EN = 0, P1.7, 0x80
    __delay_cycles(delay_value);
 
}

void send_char(unsigned char character)
{
 P1OUT &= 0X00;
 P2OUT &= 0X00;
 P1OUT = character;
  // P1OUT &= 0x00;
     P2OUT |= BIT1;                        // RS = 0 for command, P1.6
   //  RW is grounded
     P2OUT &= ~BIT2;                        //EN = 0, P1.7
     __delay_cycles(delay_value);
     P2OUT |= BIT2;                        // EN = 1, P1.7
     __delay_cycles(delay_value);
     P2OUT &= ~BIT2;                        //EN = 0, P1.7
     __delay_cycles(delay_value);
}

void send_string(char *String)
{
unsigned char i=0;
 
 while(String[i]!='\0')
 {
 
  P1OUT &= 0X00;
  P2OUT &= 0X00;
  P1OUT = String[i];
  P2OUT |= BIT1;                        // RS = 0 for command, P1.6
     //  RW is grounded
  P2OUT &= ~BIT2;                        //EN = 0, P1.7
  __delay_cycles(delay_value);
  P2OUT |= BIT2;                        // EN = 1, P1.7
  __delay_cycles(delay_value);
  P2OUT &= ~BIT2;                        //EN = 0, P1.7
  __delay_cycles(delay_value);
  if(i>=16)   // If the number of characters in the string > 16, then the below command automatically
  send_cmd(0x18);  // Shift the display right side
  __delay_cycles(40000);   // 100 millisec delay
  i++;
 }
 
}
 
void LCD_Init(void)
{
 send_cmd(0x38);   // configure LCD as 2 lined 5x7 matrix
 __delay_cycles(delay_value);
 send_cmd(0x0E);   //display on, cursor blink
 __delay_cycles(delay_value);
 send_cmd(0x06);  // auto increment of cursor
 __delay_cycles(delay_value);
 send_cmd(0x01);  // clear display
 __delay_cycles(delay_value);
 
}
 
void main(void)
{
  WDTCTL = WDTPW + WDTHOLD;                 // Stop WDT
  BCSCTL1 = CALBC1_1MHZ;                    // Set DCO
  DCOCTL = CALDCO_1MHZ;
  BCSCTL2 &= ~(DIVS_3); //This line of code ensures that the SMCLK divider is 0,
   // so we have SMCLK=DCO=1MHz (in fact if we are to have a /8 divider, it should be BCSCTL2 |= DIVS_3;).
 
 
  P1DIR = 0xFF; // make P1 as output
  P2DIR = 0xFF; // make P2 as output
 

  P1SEL = 0;  // These two are "Function Select Registers PxSEL and PxSEL2",
  P1SEL = 0; // If both are zero's means simple I/O function is selected.
  //P2SEL2 = 0; // If both are zero's means simple I/O function is selected.
 
 
 
  P2DIR |= 0x01;                            // Set P1.0 to output direction
  P2REN |= 0x01;
 
 
   __delay_cycles(1500); // wait for more than 15ms after supply rises to 4.5V
   send_cmd(0x30);
   __delay_cycles(400);  // wait more than 4.1ms
   send_cmd(0x30);
   __delay_cycles(100);  // wait more than 100us, but __delay_cycles(1) will provide 1ms
   send_cmd(0x30);
   __delay_cycles(100);
   send_cmd(0x02); // return to home
   __delay_cycles(100);
 
 
  LCD_Init(); // LCD initialization
 
        
   while(1)
   {
 
   send_cmd(0x01);  // clear display
       __delay_cycles(delay_value);
       send_cmd(0x81);  // clear display
       __delay_cycles(delay_value);
       send_string("Hello  World");
       __delay_cycles(delay_value);
   send_cmd(0xC0);  // clear display
       __delay_cycles(delay_value);
       send_string("      MSP430");
       __delay_cycles(1000000);
   }
 
}

Also i tried with some other codes. but the result was same.

please help me if you can.

Thank you.

Have a nice day.