Major USB update, fixes most (if not all) known issues USB - General - Refactored descriptors - Enabled/Disable USB endpoints - Added debug flags for special features - Code cleanup - Interface count calculation based off of enabled endpoints - Delayed wTotalLength calculation to simplify descriptor offsets - Re-ordered endpoints and interfaces - Added more debug output - Added usbInitTime to show how long keyboard initialization took (Useful when debugging bad init sequences) - Added function for usb_resume() which takes care of the resume sequence * Resume is now only called if packets are starting to timeout USB - Special Options - Added enableDeviceRestartOnUSBTimeout * A last resort hammer for bad USB Chipsets/OSs, don't use if you can help it * Disabled - Added enableUSBResume * Enables host resume wake-up signalling, required to wake a computer from sleep * Enabled - Added enableUSBLowPowerNegotiation * Enables power negotiation hack * Required to use firmware with an IPad and other hard-limit low-power USB hosts * Hasn't been tested with the recent changes * Disabled - Added enableUSBSuspend * Enables power down events on host USB bus suspend * Enabled USB - Keyboard - Attempted to cleanup HID SET_REPORT * Works much better * Still has an issue under Linux which generates *a lot* of NAKs (initializes quickly regardless) + Not present on other keyboards + SETUP -> OUT -> IN : This sequence is the problem + Specifically during the OUT phase - Enabled USB - CDC Virtual Serial Port - Code cleanup - Added convenience struct USBCDCLineCoding for easier debugging - Attempted to cleanup CDC_SET_LING_CODING * Works much better * Still has an issue under Linux which generates *a lot* of NAKs (initializes quickly regardless) + SETUP -> OUT -> IN : This sequence is the problem + Specifically during the OUT phase + Likely the same issues as HID SET_REPORT - Enabled USB - Mouse - Enabled USB - Joystick - Disabled USB - RawIO - Initial code, API not used yet - Disabled DFU - Updated load script, now faster

--- a/Output/pjrcUSB/arm/usb_keyboard.c	Sun May 29 10:27:21 2016 -0700
+++ b/Output/pjrcUSB/arm/usb_keyboard.c	Tue May 31 00:19:45 2016 -0700
@@ -1,7 +1,7 @@
 /* Teensyduino Core Library
  * http://www.pjrc.com/teensy/
  * Copyright (c) 2013 PJRC.COM, LLC.
- * Modifications by Jacob Alexander 2013-2015
+ * Modifications by Jacob Alexander 2013-2016
  *
  * Permission is hereby granted, free of charge, to any person obtaining
  * a copy of this software and associated documentation files (the
@@ -29,6 +29,9 @@
  * SOFTWARE.
  */
 
+#include <kll_defs.h>
+#if enableKeyboard_define == 1
+
 // ----- Includes -----
 
 // Compiler Includes
@@ -123,14 +126,25 @@
 			}
 		}
 
+		// USB Timeout, drop the packet, and potentially try something more drastic to re-enable the bus
 		if ( ++wait_count > TX_TIMEOUT || transmit_previous_timeout )
 		{
 			transmit_previous_timeout = 1;
+			USBKeys_Changed = USBKeyChangeState_None; // Indicate packet lost
+			#if enableDeviceRestartOnUSBTimeout == 1
 			warn_print("USB Transmit Timeout...restarting device");
-			USBKeys_Changed = USBKeyChangeState_None; // Indicate packet lost
 			usb_device_software_reset();
+			#else
+			warn_print("USB Transmit Timeout...auto-restart disabled");
+			#endif
+			// Try to wakeup
 			return;
 		}
+
+		// Try to wake up the device if we can't allocate a packet for some reason
+		// XXX This is a bit aggressive, but seems to work well. Unfortunately, not as quick as I'd like it -HaaTa
+		usb_resume();
+
 		yield();
 	}
 
@@ -277,3 +291,5 @@
 	return;
 }
 
+#endif
+