Fix example, add stuff to Readme.

Author: halfbyte

README.md

@@ -56,3 +56,18 @@ This needs tests (sort of hard to test without actual hardware, but I guess I co
 the conversion process properly).
 
 It is not handling multiple push devices. Not sure that this is actually a valid usecase for me.
+
+## Contributions
+
+...are welcome. Fork the project, open up a PR, yadda yadda.
+
+## Credits
+
+This uses Tessel's node-usb library and Automattic's libcairo based canvas implementation for the
+example.
+
+This library is inspired by an awesome weekend at JSConfEU 2019, and especially by my time spent with the
+wonderful people at [live:js](http://livejs.network).
+
+Also, thank you so much, Ableton for [being very open with Push 2 and documenting almost everything
+about this](https://github.com/Ableton/push-interface) awesome hardware.

examples/simple-anim.js

@@ -1,3 +1,4 @@
+const USB = require('usb')
 const Canvas = require('canvas')
 const path = require('path')
 const { initPush, sendFrame } = require(path.join(__dirname, '..', 'index.js'))
@@ -27,13 +28,16 @@ let frameNum = 0
 function nextFrame() {
   drawFrame(ctx, frameNum)
   frameNum++
-  sendFrame(ctx, function() {
-    process.nextTick(function() {
-      nextFrame()
-    })
+  sendFrame(ctx, function(error) {
+    // we can ignore any error here, more or less
+    setTimeout(nextFrame,10) // Do not use nextTick here, as this will not allow USB callbacks to fire.
   })
 }
 
-initPush(function() {
+initPush(function(error) {
+  if (error) {
+    console.log(error)
+  }
+  // It's ok to continue, as a Push 2 device may appear later
   nextFrame()
 })

index.js

@@ -37,10 +37,10 @@ function convertImage(image, frame) {
   }
 }
 /* this is thi actual device init */
-function _init(push) {
-  if (push == null) { return; }
-  push.open()
-  const pushInterface = push.interface(0)
+function _init(device) {
+  if (device == null) { return; }
+  device.open()
+  const pushInterface = device.interface(0)
   pushInterface.claim()
   endpoint = pushInterface.endpoint(1)
 }

package.json

@@ -1,10 +1,11 @@
 {
-  "name": "ableton-push-canvas-display",
+  "name": "@halfbyte/ableton-push-canvas-display",
   "version": "1.0.0",
   "description": "send contents of a canvas 2d context to the Ableton Push 2 display",
   "main": "index.js",
   "scripts": {
-    "test": "echo \"Error: no test specified\" && exit 1"
+    "test": "echo \"Error: no test specified\" && exit 1",
+    "example": "node examples/simple-anim.js"
   },
   "repository": {
     "type": "git",