implement createChar (with helper options) and fix write(int)

lib/lcd.js

@@ -179,19 +179,31 @@ LCD.prototype.autoscroll = function (on) {
 
 LCD.prototype.noAutoscroll = function () { this.autoscroll(false); }
 
-// TODO: finish this up (make .write handle buffer instead of string?)
-LCD.prototype.createCharTODO = function (location, charmap) {
+LCD.prototype.createChar = function (location, charmap) {
   location &= 0x7;
   this.command(LCD_SETCGRAMADDR | (location << 3));
-  for (var i = 0; i < 8; i++) {
-    this.write(charmap[i]);
-  }
+
+  var buffer = new Buffer(8);
+  if (Array.isArray(charmap)) for (var i = 0; i < 8; i++) {
+    buffer[i] = parseInt(charmap[i], 2);
+  } else if (typeof charmap === 'string') for (var i = 0; i < 8; i++) {
+    var byte = 0;
+    if (charmap[5*i + 0] !== ' ') byte |= 0x10;
+    if (charmap[5*i + 1] !== ' ') byte |= 0x08;
+    if (charmap[5*i + 2] !== ' ') byte |= 0x04;
+    if (charmap[5*i + 3] !== ' ') byte |= 0x02;
+    if (charmap[5*i + 4] !== ' ') byte |= 0x01;
+    buffer[i] = byte;
+  } else buffer = charmap;
+  this.write(buffer);
 }
 
 LCD.prototype.write = LCD.prototype.print = function (str) {
-  // TODO: map misc Unicode chars to typical LCD charset?
-  for (var i = 0, len = str.length; i < len; i++)
-    this.send(str.charCodeAt(i), this.board.HIGH);
+  // TODO: map misc Unicode chars to typical LCD extended charset?
+  var bytes = (typeof str === 'string') ? new Buffer(str, 'ascii') :
+    (typeof str === 'object') ? str : new Buffer([str]);
+  for (var i = 0, len = bytes.length; i < len; i++)
+    this.send(bytes[i], this.board.HIGH);
 }