PIC18F4550 LCD Example
This
topic shows a simple example for interfacing LCD display with HD44780
controller with PIC18F4550 microcontroller using CCS PIC C compiler. In 4-bit mode there are 7 data lines between the PIC microcontroller and the LCD which are: RS, R/W, E, D4, D5, D6 and D7.
Interface PIC18F4550 with LCD circuit:
The button connected to RC0 used to increment a number displayed in the 2nd row as shown in the video below.
Interface PIC18F4550 with LCD CCS C code:
// Interfacing PIC18F4550 with LCD display CCS C code
// http://ccspicc.blogspot.com/
// electronnote@gmail.com
//LCD module connections
#define LCD_RS_PIN PIN_D0
#define LCD_RW_PIN PIN_D1
#define LCD_ENABLE_PIN PIN_D2
#define LCD_DATA4 PIN_D3
#define LCD_DATA5 PIN_D4
#define LCD_DATA6 PIN_D5
#define LCD_DATA7 PIN_D6
//End LCD module connections
#include <18F4550.h>
#fuses NOMCLR INTRC_IO
#use delay(clock=8000000)
#include <lcd.c>
char i;
void main(){
setup_oscillator(OSC_8MHZ); // Setup internal oscillator @ 8MHz
lcd_init(); // Initialize LCD module
lcd_gotoxy(2, 1); // Go to column 2 row 1
lcd_putc("PIC18F4550");
lcd_gotoxy(1, 2); // Go to column 1 row 2
lcd_putc("LCD example");
for(i = 0; i < 2; i++){ // Shift display right 2 times
delay_ms(200);
lcd_send_byte(0,0x1E);
}
delay_ms(5000);
for(i = 0; i < 14; i++){ // Shift display right 14 times
delay_ms(200);
lcd_send_byte(0,0x1E);
}
lcd_putc('\f'); // LCD clear
lcd_gotoxy(18, 1); // Go to column 18 row 1
lcd_putc("Hello world!");
lcd_gotoxy(17, 2); // Go to column 17 row 2
lcd_putc("Have a nice day");
for(i = 0; i < 15; i++){ // Shift display left 15 times
delay_ms(200);
lcd_send_byte(0,0x18);
}
delay_ms(5000);
lcd_putc('\f'); // LCD clear
lcd_gotoxy(3, 1); // Go to column 3 row 1
lcd_putc("Hello world!");
i = 0;
while(TRUE){
if(input(PIN_C0) == 0){
i++;
if(i > 100)
i = 0;
lcd_gotoxy(7, 2); // Go to column 7 row 2
printf(lcd_putc,"%3u",i); // Write i with 3 numbers max
delay_ms(200);
}
}
}
Interface PIC16F877A with LCD video:
The following video shows the example in a hardware circuit.