Hello sir/mam,
I am doing 16X2 LCD character display programming in 4 bit mode using MSP430G2553 microcontroller .My code is given below and Hardware connections are also attached.After powering up the board,the LCD glows but why the characters are not showing?
#include "msp430g2553.h"
#include "stdio.h"
#include "string.h"
#include"stdlib.h"
#define delay_value 500
voidLCD_Init(void)
{
send_cmd(0x38); // configure LCD as 2 lined 5x7 matrix
delayms(delay_value);
send_cmd(0x0E); //display on, cursor blink
delayms(delay_value);
send_cmd(0x06); // auto <span id="IL_AD10" class="IL_AD">increment</span> of cursor
delayms(delay_value);
send_cmd(0x01); // <span id="IL_AD3" class="IL_AD">clear display</span>
delayms(delay_value);
}
voidsend_cmd(unsignedchar command)
{
P1OUT &= 0X00;
P2OUT &= 0X00;
P2OUT = command;
P1OUT &= 0X00;
P1OUT &= ~0x40; // RS = 0 for command, P1.6 0x40
//RW is grounded
P1OUT &= ~0x80; //EN = 0, P1.7, 0x80
delayms(delay_value);
P1OUT |= 0x80; // EN = 1, P1.7, 0x80
delayms(delay_value);
P1OUT &= ~0x80; //EN = 0, P1.7, 0x80
delayms(delay_value);
}
voidsend_char(unsignedchar character)
{
P1OUT &= 0X00;
P2OUT &= 0X00;
P2OUT = character;
// P1OUT &= 0x00;
P1OUT |= 0x40; // RS = 0 for command, P1.6
// RW is grounded
P1OUT &= ~0x80; //EN = 0, P1.7
delayms(delay_value);
P1OUT |= 0x80; // EN = 1, P1.7
delayms(delay_value);
P1OUT &= ~0x80; //EN = 0, P1.7
delayms(delay_value);
}
voidsend_string(char *String)
{
unsignedchar i=0;
while(String[i]!='\0')
{
P1OUT &= 0X00;
P2OUT &= 0X00;
P2OUT = String[i];
P1OUT |= 0x40; // RS = 0 for command, P1.6
// RW is grounded
P1OUT &= ~0x80; //EN = 0, P1.7
delayms(delay_value);
P1OUT |= 0x80; // EN = 1, P1.7
delayms(delay_value);
P1OUT &= ~0x80; //EN = 0, P1.7
delayms(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
delayms(40000); // 100 millisec <span id="IL_AD5" class="IL_AD">delay</span>
i++;
}
}
voiddelayms(unsignedint value)
{
unsignedint i;
for(i=0;i< __delay_cycles;i++);
}
voidmain(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
P2SEL = 0; // These two are "Function Select Registers PxSEL and PxSEL2",
P2SEL2 = 0; // If both are zero's means simple I/O function is selected.
P1DIR |= 0x01; // Set P1.0 to output direction
P1REN |= 0x01;
delayms(1500); // wait for more than 15ms after supply rises to 4.5V
send_cmd(0x30);
delayms(400); // wait more than 4.1ms
send_cmd(0x30);
delayms(100); // wait more than 100us, but delayms(1) will provide 1ms
send_cmd(0x30);
delayms(100);
send_cmd(0x02); // return to home
delayms(100);
LCD_Init(); // LCD initialization
while(1)
{
send_cmd(0x01); // clear display
delayms(delay_value);
send_cmd(0x81); // clear display
delayms(delay_value);
send_string("NPEDUCATIONS");
delayms(delay_value);
send_cmd(0xC0); // clear display
delayms(delay_value);
send_string("http://www.npeducations.com");
delayms(delay_value);
}
}
}![]()
