I have created a program that scroll text vertically :

// initialload.c // for NerdKits with ATmega168 // mrobbins@mit.edu

define F_CPU 14745600

include <stdio.h>

include <avr/io.h>

include <avr/interrupt.h>

include <avr/pgmspace.h>

include <inttypes.h>

include "../libnerdkits/delay.h"

include "../libnerdkits/lcd.h"

include <avr/io.h>

include <avr/delay.h>

int main() { // LED as output DDRC |= (1<<PC5);

// turn on LED
PORTC |= (1<<PC5);

// fire up the LCD
lcd_init();
lcd_home();

// print message to screen // 20 columns wide: // 01234567890123456789 lcd_line_one(); lcd_write_string(PSTR(" Some times if")); lcd_line_two(); lcd_write_string(PSTR(" you think hard it")); lcd_line_three(); lcd_write_string(PSTR(" might pay off ")); lcd_line_four(); lcd_write_string(PSTR(" ** ")); delay_ms(1000); lcd_line_one(); lcd_write_string(PSTR(" **")); lcd_line_two(); lcd_write_string(PSTR(" Some times if")); lcd_line_three(); lcd_write_string(PSTR(" you think hard it")); lcd_line_four(); lcd_write_string(PSTR(" might pay off ")); delay_ms(1000); lcd_line_one(); lcd_write_string(PSTR(" might pay off ")); lcd_line_two(); lcd_write_string(PSTR(" **")); lcd_line_three(); lcd_write_string(PSTR(" Some times if")); lcd_line_four(); lcd_write_string(PSTR(" you think hard it")); delay_ms(1000); lcd_line_one(); lcd_write_string(PSTR(" you think hard it")); lcd_line_two(); lcd_write_string(PSTR(" might pay off ")); lcd_line_three(); lcd_write_string(PSTR(" ** ")); lcd_line_four(); lcd_write_string(PSTR(" Some times if")); delay_ms(1000); lcd_line_one(); lcd_write_string(PSTR(" Some times if")); lcd_line_two(); lcd_write_string(PSTR(" you think hard it")); lcd_line_three(); lcd_write_string(PSTR(" might pay off ")); lcd_line_four(); lcd_write_string(PSTR(" "));

// busy loop while(100) {

}

return 0; }

This is really cool. I was wondering how to do this, it will take some refinement to fit what I have in mind but you did the hard part, Thanks

Ralph

Here is the corrected code (minor typos and extra }):

#define F_CPU 14745600
#include <stdio.h>
#include <avr/io.h>
#include <avr/interrupt.h>
#include <avr/pgmspace.h>
#include <inttypes.h>
#include "../libnerdkits/delay.h"
#include "../libnerdkits/lcd.h"
#include <avr/io.h>
#include <avr/delay.h>

int main() { // LED as output DDRC |= (1<<PC5);

// turn on LED
PORTC |= (1<<PC5);

// fire up the LCD
lcd_init();
lcd_home();
// print message to screen 
// 20 columns wide: 
// 01234567890123456789 lcd_line_one();

lcd_write_string(PSTR(" Some times if")); 
lcd_line_two(); 
lcd_write_string(PSTR(" you think hard it")); 
lcd_line_three(); 
lcd_write_string(PSTR(" might pay off ")); 
lcd_line_four(); lcd_write_string(PSTR(" * ")); 
delay_ms(1000); 
lcd_line_one(); 
lcd_write_string(PSTR(" *")); 
lcd_line_two(); 
lcd_write_string(PSTR(" Some times if")); 
lcd_line_three(); 
lcd_write_string(PSTR(" you think hard it")); 
lcd_line_four(); 
lcd_write_string(PSTR(" might pay off ")); 
delay_ms(1000); 
lcd_line_one(); 
lcd_write_string(PSTR(" might pay off ")); 
lcd_line_two(); 
lcd_write_string(PSTR(" *")); 
lcd_line_three(); 
lcd_write_string(PSTR(" Some times if")); 
lcd_line_four(); 
lcd_write_string(PSTR(" you think hard it")); 
delay_ms(1000); 
lcd_line_one(); 
lcd_write_string(PSTR(" you think hard it")); 
lcd_line_two(); 
lcd_write_string(PSTR(" might pay off ")); 
lcd_line_three(); 
lcd_write_string(PSTR(" * ")); 
lcd_line_four(); 
lcd_write_string(PSTR(" Some times if")); 
delay_ms(1000); 
lcd_line_one(); 
lcd_write_string(PSTR(" Some times if")); 
lcd_line_two(); 
lcd_write_string(PSTR(" you think hard it")); 
lcd_line_three(); 
lcd_write_string(PSTR(" might pay off ")); 
lcd_line_four(); lcd_write_string(PSTR(" "));

// busy loop while(100) {

return 0; }

The code stops on the last page if you add a while(1) loop it loops around and shows all of the pages again and again.

int main() { // LED as output DDRC |= (1<<PC5);

// turn on LED
PORTC |= (1<<PC5);
while(1)
{
// fire up the LCD
lcd_init();
lcd_home();
...
}

Of course now I have to learn interrupts to get any thing else done.

Anyone know how to do horizontal scrolling?

Ralph

Here is discussion of horizontal scrolling:

And here is the working code for the temperature project:

Ralph