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Feb 16th, 2014

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function hd44780(write) {
// initialise
write(0x33,1);
write(0x32,1);
write(0x28,1);
write(0x0C,1);
write(0x06,1);
write(0x01,1);
// add functions
return {
write: write,
// clear screen
clear: function() { write(0x01,1); },
// print text
print : function(str) {
for (var i=0;i<str.length;i++)
write(Integer.valueOf(str.charAt(i)));
},
// flashing block for the current cursor, or underline
cursor : function(block) { write(block?0x0F:0x0E,1); },
// set cursor pos, top left = 0,0
setCursor : function(x,y) { var l=[0x00,0x40,0x14,0x54];write(0x80|(l[y]+x),1); },
// set special character 0..7, data is an array(8) of bytes, and then return to home addr
createChar : function(ch, data) {
write(0x40 | ((ch&7) << 3), 1);
for (var i=0; i<8; i++) write(data[i]);
write(0x80,1);
}
};
}
function connect(/*=PIN*/_rs,/*=PIN*/_en,/*=PIN*/_d4,/*=PIN*/_d5,/*=PIN*/_d6,/*=PIN*/_d7) {
var data = [_d7,_d6,_d5,_d4];
var rs = _rs;
var en = _en;
digitalWrite([rs,en], 0);
var write = function(x, c) {
digitalWrite(rs, c===undefined);
digitalWrite(data, x>>4);
digitalPulse(en, 1, 0.01);
digitalWrite(data, x);
digitalPulse(en, 1, 0.01);
};
//return new HD44780(write);
return write;
}
var connect = connect(A4,A5,A0,A7,A2,A3);
var led = hd44780(connect);
led.print("Hello World!");

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