LCD display

LCD is used to display information to user. The Home-Lab is equipped with standard 2×16 alphanumeric HD44780-based LCD (datasheet). LCD can be controller 4-bit or memory-mapped mode. Following examples are using 4-bit mode. LCD data bits are connectet to PORTA.

LCD can connecteddirectly to StudyBoard (starting from V.3) or by using extension cable (all versions).

2×16 LCD with backlight connected to StudyBoard v.3.1

1×16 LCD without backlight connected to StudyBoard v.2.2

Both connection types have electrically identical connection to AVR.

Example code here uses Peter Fleury LCD driver (see the external link below).

• lcd.c
• lcd.h

#include <stdlib.h>
#include <avr/io.h>
#include <avr/pgmspace.h>
 
#include "lcd.h"
 
/*PS for Distance Lab use:
#include <util/lcd.h>
#include <util/lcd.c>
*/
 
int main(void)
{
	// Initialize display, cursor off
	lcd_init(LCD_DISP_ON);
 
	// Clear display and home cursor
	lcd_clrscr();
 
	// Put string to display (line 1) with linefeed
	lcd_puts("LCD Test Line 1\n");
}

Peter Fleury LCD example

LCD command reference