Several automated and semi-automated devices require a message to be displayed in order to indicate their working status. In continuation to LCD interfacing with PIC18F4550, this article explains how to display a message or string on a 16×2 character LCD.
Programming steps:
· Configure the LCD.
· Store a string in a character array.
unsigned char data[20]=“EngineersGarage”;
· Run a loop till the loop counter encounters the null character ‘\0’ of the string.
· Use lcddata() function to send individual character values of the string to be displayed on LCD.
Code:
while(data[i]!=’\0′)
{ lcddata(data[i]);
i++; Delay_ms(300); }
// Program to display text on 16x2 LCD using PIC18F4550 Microcontroller
// Configuration bits
/* _CPUDIV_OSC1_PLL2_1L, // Divide clock by 2
_FOSC_HS_1H, // Select High Speed (HS) oscillator
_WDT_OFF_2H, // Watchdog Timer off
MCLRE_ON_3H // Master Clear on
*/
//LCD Control pins
#define rs LATA.F0
#define rw LATA.F1
#define en LATA.F2
//LCD Data pins
#define lcdport LATB
void lcd_ini();
void lcdcmd(unsigned char);
void lcddata(unsigned char);
unsigned char data[20]="EngineersGarage";
unsigned int i=0;
void main(void)
{
TRISA=0; // Configure Port A as output port
LATA=0;
TRISB=0; // Configure Port B as output port
LATB=0;
lcd_ini(); // LCD initialization
while(data[i]!='\0')
{ lcddata(data[i]); // Call lcddata function to send characters
// one by one from "data" array
i++; Delay_ms(300);
}}void lcd_ini()
{ lcdcmd(0x38); // Configure the LCD in 8-bit mode, 2 line and 5x7 font
lcdcmd(0x0C); // Display On and Cursor Off
lcdcmd(0x01); // Clear display screen
lcdcmd(0x06); // Increment cursor
lcdcmd(0x80); // Set cursor position to 1st line, 1st column}
void lcdcmd(unsigned char cmdout)
{ lcdport=cmdout; //Send command to lcdport=PORTB
rs=0;
rw=0;
en=1;
Delay_ms(10);
en=0;
For more detail: How to display text on 16×2 LCD using PIC18F4550 Microcontroller
