Add util.js featuring bufferToString()

usb/blink-test-led.js

@@ -2,6 +2,7 @@
 'use strict';
 
 var usb = require('usb');
+var util = require('./util');
 
 var vid = 0x16d3;
 var pid = 0x05ea;
@@ -34,7 +35,7 @@ setInterval(function() {
                 console.error("USB error: %s", err2);
                 process.exit(2);
             }
-            console.log('Received', receivedBuffer, receivedBuffer.length);
+            console.log('Received', util.bufferToString(receivedBuffer));
         })
     });
 }, 500)

usb/util.js

@@ -0,0 +1,13 @@
+exports = module.exports = {
+    bufferToString: function(buffer) {
+        var str = '';
+        for (var i = 0; i < buffer.length; i++) {
+            var hex = buffer[i].toString(16) + ' ';
+            if (hex.length <= 2) {
+                hex = '0' + hex;
+            }
+            str += hex;
+        };
+        return str;
+    }
+}