Add a simple Processing RawHID example

extras/ProcessingRawHID/HID_stuff.pde

@@ -0,0 +1,109 @@
+import com.codeminders.hidapi.HIDDeviceInfo;
+import com.codeminders.hidapi.HIDManager;
+import java.util.*;
+
+HIDManager hid_mgr = null;
+
+boolean thisIsWindows = false; //windows require a '0' report ID
+
+public int init_HID() {
+
+  String OS = System.getProperty("os.name", "generic").toLowerCase(Locale.ENGLISH);
+  if (OS.indexOf("win") >= 0) {
+    thisIsWindows = true;
+  }
+
+  try {
+    ClassPathLibraryLoader.loadNativeHIDLibrary();
+    hid_mgr = HIDManager.getInstance();
+  }
+  catch (Exception ex) {
+    ex.printStackTrace();
+    return 0;
+  }
+  return 1;
+}
+
+public int print_HID_devices() {
+  if (hid_mgr==null) return 0;
+  try {
+    for (HIDDeviceInfo info : hid_mgr.listDevices ()) {
+      //println(info.getProduct_string()+" "+info.getVendor_id()+" "+info.getProduct_id());
+      println(info);
+    }
+  }
+  catch (Exception ex) {
+    ex.printStackTrace();
+    return 0;
+  }
+  return 1;
+}
+
+public HIDDeviceInfo[] filter_HID_ID_usage(int vid, int pid, int usage_page, int usage) {
+  if (hid_mgr==null) return null;
+  List<HIDDeviceInfo> dev_list = new ArrayList<HIDDeviceInfo>();
+  try {
+    for (HIDDeviceInfo info : hid_mgr.listDevices ()) {
+      if (info.getVendor_id()==vid && info.getProduct_id()==pid && info.getUsage_page()==usage_page && info.getUsage()==usage) {
+        try {
+          //println(info);
+          dev_list.add(info);
+        }
+        catch (Exception ex) {
+        }
+      }
+    }
+  }
+  catch (Exception ex) {
+    ex.printStackTrace();
+    return null;
+  }
+
+  HIDDeviceInfo[] dev_list_arr = new HIDDeviceInfo[ dev_list.size() ];
+  dev_list.toArray( dev_list_arr );
+  if (dev_list.size() > 0) println("Found " + dev_list.size() + " devices");
+  return dev_list_arr;
+}
+
+public void HID_write_to_device (byte data[], HIDDevice device) {
+  try {
+    if (device!=null) {
+      if (thisIsWindows) {
+        byte dataWithReportID[] = new byte[data.length+1];
+        dataWithReportID[0] = 0;
+        System.arraycopy(data, 0, dataWithReportID, 1, data.length);
+        device.write(dataWithReportID);
+      } else {
+        device.write(data);
+      }
+    }
+  }
+  catch (Exception ex) {
+    ex.printStackTrace();
+    target_device=null;
+  }
+}
+public byte[] HID_read_from_device (HIDDevice device, int timeout) {
+  byte buf[]=new byte[256];
+  try {
+    if (device!=null) {
+      int returnedBytes = device.readTimeout(buf, timeout);
+      byte retBuf[];
+      retBuf=Arrays.copyOf(buf, returnedBytes);
+      return retBuf;
+    }
+  }
+  catch (Exception ex) {
+    ex.printStackTrace();
+  }
+  return null;
+}
+
+void delay_ms(int ms) {
+  try {    
+    Thread.sleep(ms);
+  }
+  catch(Exception e) {
+  }
+}
+

extras/ProcessingRawHID/ProcessingRawHID.pde

@@ -0,0 +1,65 @@
+ /*
+Copyright (c) 2016 Deqing Sun
+
+This is a simple Processing sketch that talks to Arduino with RawHID firmware.
+
+"javahidapi" from "Codeminders" is used for this sketch to do lower level communication. 
+javahidapi is available on https://code.google.com/p/javahidapi/
+*/
+HIDDevice target_device=null;
+
+void init_device() {
+  //print_HID_devices();
+  //This funtion uses Arduino Micro VID/PID pair, change it if you use other Arduino
+  HIDDeviceInfo[] dev_list=filter_HID_ID_usage(0x2341, 0x8037, 65472, 3072); //VID PID usage_page usage
+  if (dev_list!=null && dev_list.length>0) {
+    //println(dev_list);   
+    try {
+      target_device=dev_list[0].open();
+    }
+    catch (Exception ex) {
+      ex.printStackTrace();
+    }
+  } else {
+    //println("DEV not found");
+  }
+}
+
+void setup() {
+  init_HID();
+  //print_HID_devices();
+
+  init_device();
+  frameRate(30);
+}
+
+void draw() {
+  background(0);
+  if (target_device!=null) {  
+    byte buf[]=HID_read_from_device (target_device, 10);
+    if (buf!=null) {
+      if (buf.length>0) {
+        println(buf);
+      }
+    }else{
+      target_device=null;
+    }
+  } else {
+    init_device();  //this part handles hot plugging
+  }
+}
+
+void keyPressed() {
+  if (key == ' ') {
+    if (target_device!=null) {
+      byte buf[]=new byte[64];
+      buf[0]=(byte)1;
+      buf[1]=(byte)2;
+      buf[2]=(byte)3;
+      buf[3]=(byte)4;
+      buf[62]=(byte)63;
+      buf[63]=(byte)64;
+      HID_write_to_device(buf, target_device);
+    }
+  }
+}