Scrolling text with Sparkfun 16*2 LCD (need help)

Forum 2005-2010 (read only) Software Syntax & Programs
#1

I am working on some code to scroll text marquee style
right to left then when it has scrolled all the way to the left off the screen I want it to stop.

there are scroll commands in the data sheet for my LCD
Scroll Right 0x1C
Scroll Left 0x18
however I have not been able to figure out how to use them.

here is the code I wrote to do this so far.
It works with a single character but if I add any more and it is buggy.

any help would be greatly appreciated.

#include <NewSoftSerial.h>

NewSoftSerial LCD(0,5); // serial LCD connected to pin #5

int y = 15; // for scroll

void setup(){
LCD.begin(9600);
}

void loop()
{
goTo(y);
LCD.print(“X”);
y=y-1;

if(y<0){
y=15;
}

delay(250);
clearLCD();

}

// Serial LCD COMMAND CODES
// Initiates a function command to the display
void serCommand() {
LCD.print(0xFE, BYTE);
}
// Resets the display, undoing any scroll and removing all text
void clearLCD() {
serCommand();
LCD.print(0x01, BYTE);
}
// Starts the cursor at the beginning of the first line (convienence method for goTo(0))
void selectLineOne() { //puts the cursor at line 0 char 0.
serCommand(); //command flag
LCD.print(128, BYTE); //position
}
// Starts the cursor at the beginning of the second line (convienence method for goTo(16))
void selectLineTwo() { //puts the cursor at line 0 char 0.
serCommand(); //command flag
LCD.print(192, BYTE); //position
}
// Sets the cursor to the given position
// line 1: 0-15, line 2: 16-31, 31+ defaults back to 0
void goTo(int position) {
if (position < 16) {
serCommand(); //command flag
LCD.print((position+128), BYTE);
} else if (position < 32) {
serCommand(); //command flag
LCD.print((position+48+128), BYTE);
} else {
goTo(0);
}
}

#2

ok I think I solved my problem… Here is my code now
It only works correctly when I put those spaces in the front of the text I need to figure out how to remove them then I will be golden.

#include <NewSoftSerial.h>


NewSoftSerial LCD(0,5); // serial LCD connected to pin #5

char line1[] = "               01234567890ABCDE";
#define line1Length (sizeof(line1)-2)

int x = 15; // for scroll
int y = 0; // for scroll

void setup(){
  LCD.begin(9600);
}

void loop()
{
  if(x<16+y){
  LCD.print(line1[x]);
  }
  x++;
        
  if(x>line1Length){
    y++;
    x=0+y;
    
    goTo(y);
    delay(300);
    clearLCD();
  }
  if (y>line1Length){
    y = 0;
  }
  
  
  
 
}
  
  



// Serial LCD COMMAND CODES
    // Initiates a function command to the display
      void serCommand() {
          LCD.print(0xFE, BYTE);
          }
    // Resets the display, undoing any scroll and removing all text
      void clearLCD() {
           serCommand();
           LCD.print(0x01, BYTE);
         }
    // Starts the cursor at the beginning of the first line (convienence method for goTo(0))
      void selectLineOne() {  //puts the cursor at line 0 char 0.
           serCommand();   //command flag
           LCD.print(128, BYTE);    //position
        }
    // Starts the cursor at the beginning of the second line (convienence method for goTo(16))
      void selectLineTwo() {  //puts the cursor at line 0 char 0.
           serCommand();   //command flag
           LCD.print(192, BYTE);    //position
        }
        // Sets the cursor to the given position
    // line 1: 0-15, line 2: 16-31, 31+ defaults back to 0
    void goTo(int position) {
      if (position < 16) { 
        serCommand();   //command flag
        LCD.print((position+128), BYTE);
      } else if (position < 32) {
        serCommand();   //command flag
        LCD.print((position+48+128), BYTE);
      } else { 
        goTo(0); 
      }
    }
#3