lcd1.js

//******************************************************************

var b = require ('bonescript');

var LCD_RS  = "P8_12";              //LCD Register Set (RS) control 
var LCD_E   = "P8_14";              //LCD Enable (E) control
var LCD_DB0 = "P8_16";              //LCD Data line DB0 
var LCD_DB1 = "P8_18";              //LCD Data line DB1 
var LCD_DB2 = "P8_20";              //LCD Data line DB2 
var LCD_DB3 = "P8_22";              //LCD Data line DB3 
var LCD_DB4 = "P8_24";              //LCD Data line DB4 
var LCD_DB5 = "P8_26";              //LCD Data line DB5 
var LCD_DB6 = "P8_28";              //LCD Data line DB6 
var LCD_DB7 = "P8_30";              //LCD Data line DB7 

var counter = 1;                    //counter to be displayed

b.pinMode(LCD_RS,  b.OUTPUT);       //set pin to digital output
b.pinMode(LCD_E,   b.OUTPUT);       //set pin to digital output
b.pinMode(LCD_DB0, b.OUTPUT);       //set pin to digital output
b.pinMode(LCD_DB1, b.OUTPUT);       //set pin to digital output
b.pinMode(LCD_DB2, b.OUTPUT);       //set pin to digital output
b.pinMode(LCD_DB3, b.OUTPUT);       //set pin to digital output
b.pinMode(LCD_DB4, b.OUTPUT);       //set pin to digital output
b.pinMode(LCD_DB5, b.OUTPUT);       //set pin to digital output
b.pinMode(LCD_DB6, b.OUTPUT);       //set pin to digital output
b.pinMode(LCD_DB7, b.OUTPUT);       //set pin to digital output
LCD_init(LCD_update);               //call LCD initialize

//******************************************************************
//LCD_update
//******************************************************************

function LCD_update()
{
LCD_putchar(counter, next);         //write 'counter' value to LCD

//When LCD_putchar completes, schedule the next run of it
function next()
  {
  counter++;                        //update counter
  if(counter > 9)                   //Re-init after 9
    {
    counter = 1;
    LCD_init(LCD_update);
    }
  else
    setTimeout(LCD_update, 500);    //update again in 500 ms
  }
}

//******************************************************************
//LCD_init
//******************************************************************

function LCD_init(callback)
{
//LCD Enable (E) pin low
b.digitalWrite(LCD_E, b.LOW);
  
//Start at the beginning of the list of steps to perform
var i = 0;

//List of steps to perform
var steps =
  [
  function(){ setTimeout(next, 15); },          //delay 15ms
  function(){ LCD_putcommand(0x38, next); },    //set for 8-bit operation 
  function(){ setTimeout(next, 5); },           //delay 5ms
  function(){ LCD_putcommand(0x38, next); },    //set for 8-bit operation
  function(){ LCD_putcommand(0x38, next); },    //set for 5 x 7 character
  function(){ LCD_putcommand(0x0E, next); },    //display on
  function(){ LCD_putcommand(0x01, next); },    //display clear
  function(){ LCD_putcommand(0x06, next); },    //entry mode set
  function(){ LCD_putcommand(0x00, next); },    //clear display, cursor at home
  function(){ LCD_putcommand(0x00, callback); } //clear display, cursor at home
  ];

next(); //Execute the first step

//Function for executing the next step
function next()
  {
  i++;
  steps[i-1]();
  }
}

//******************************************************************
//LCD_putcommand
//******************************************************************

function LCD_putcommand(cmd, callback)
{
//parse command variable into individual bits for output
//to LCD
if((cmd & 0x0080)== 0x0080) b.digitalWrite(LCD_DB7, b.HIGH);
  else b.digitalWrite(LCD_DB7, b.LOW);
if((cmd & 0x0040)== 0x0040) b.digitalWrite(LCD_DB6, b.HIGH);
  else b.digitalWrite(LCD_DB6, b.LOW);
if((cmd & 0x0020)== 0x0020) b.digitalWrite(LCD_DB5, b.HIGH);
  else b.digitalWrite(LCD_DB5, b.LOW);
if((cmd & 0x0010)== 0x0010) b.digitalWrite(LCD_DB4, b.HIGH);
  else b.digitalWrite(LCD_DB4, b.LOW);
if((cmd & 0x0008)== 0x0008) b.digitalWrite(LCD_DB3, b.HIGH);
  else b.digitalWrite(LCD_DB3, b.LOW);
if((cmd & 0x0004)== 0x0004) b.digitalWrite(LCD_DB2, b.HIGH);
  else b.digitalWrite(LCD_DB2, b.LOW);
if((cmd & 0x0002)== 0x0002) b.digitalWrite(LCD_DB1, b.HIGH);
  else b.digitalWrite(LCD_DB1, b.LOW);
if((cmd & 0x0001)== 0x0001) b.digitalWrite(LCD_DB0, b.HIGH);
  else b.digitalWrite(LCD_DB0, b.LOW);
 
//LCD Register Set (RS) to logic zero for command input
b.digitalWrite(LCD_RS, b.LOW);
//LCD Enable (E) pin high
b.digitalWrite(LCD_E, b.HIGH);
    
//End the write after 1ms
setTimeout(endWrite, 1);

function endWrite()
  {
  //LCD Enable (E) pin low
  b.digitalWrite(LCD_E, b.LOW);
  //delay 1ms before calling 'callback'
  setTimeout(callback, 1);
  }
}

//******************************************************************
//LCD_putchar
//******************************************************************

function LCD_putchar(chr1, callback)
{
//Convert chr1 variable to UNICODE (ASCII) 
var chr = chr1.toString().charCodeAt(0);

//parse character variable into individual bits for output
//to LCD
if((chr & 0x0080)== 0x0080) b.digitalWrite(LCD_DB7, b.HIGH);
  else b.digitalWrite(LCD_DB7, b.LOW);
if((chr & 0x0040)== 0x0040) b.digitalWrite(LCD_DB6, b.HIGH);
  else b.digitalWrite(LCD_DB6, b.LOW);
if((chr & 0x0020)== 0x0020) b.digitalWrite(LCD_DB5, b.HIGH);
  else b.digitalWrite(LCD_DB5, b.LOW);
if((chr & 0x0010)== 0x0010) b.digitalWrite(LCD_DB4, b.HIGH);
  else b.digitalWrite(LCD_DB4, b.LOW);
if((chr & 0x0008)== 0x0008) b.digitalWrite(LCD_DB3, b.HIGH);
  else b.digitalWrite(LCD_DB3, b.LOW);
if((chr & 0x0004)== 0x0004) b.digitalWrite(LCD_DB2, b.HIGH);
  else b.digitalWrite(LCD_DB2, b.LOW);
if((chr & 0x0002)== 0x0002) b.digitalWrite(LCD_DB1, b.HIGH);
  else b.digitalWrite(LCD_DB1, b.LOW);
if((chr & 0x0001)== 0x0001) b.digitalWrite(LCD_DB0, b.HIGH);
  else b.digitalWrite(LCD_DB0, b.LOW);

//LCD Register Set (RS) to logic one for character input
b.digitalWrite(LCD_RS, b.HIGH);
//LCD Enable (E) pin high
b.digitalWrite(LCD_E, b.HIGH);

//End the write after 1ms
setTimeout(endWrite, 1);

function endWrite()
  {
  //LCD Enable (E) pin low and call scheduleCallback when done
  b.digitalWrite(LCD_E, b.LOW);
  //delay 1ms before calling 'callback'
  setTimeout(callback, 1);
  }
}

//******************************************************************