Adding McHCK DFU Bootloader

- Heavily modified, not compatible with McHCK images
- Uses 4k of Flash (rather than 3k)
- LED turns on when in firmware flash mode
- Changed the USB IDs
- Added CMake build system
- Updated linker script to be closer to what is used for the rest of the projects
- Removed a lot of unnecessary code
- Added a license header to each file (using the same license as the McHCK had)
- Updated the USB Vendor, Product and Serial strings
- Using the Kiibohd initialization sequence rather than the McHCK one
- Using Kiibohd interrupt vector table and other misc mk20dx setup

Bootloader/usb-common.h

@@ -0,0 +1,60 @@
+/* Copyright (c) 2011,2012 Simon Schubert <2@0x2c.org>.
+ * Modifications by Jacob Alexander 2014 <haata@kiibohd.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _USB_COMMON_H
+#define _USB_COMMON_H
+
+// ----- Enumerations -----
+
+/**
+ * USB request data structures.
+ */
+
+enum usb_tok_pid {
+	USB_PID_TIMEOUT = 0,
+	USB_PID_OUT = 1,
+	USB_PID_ACK = 2,
+	USB_PID_DATA0 = 3,
+	USB_PID_IN = 9,
+	USB_PID_NAK = 10,
+	USB_PID_DATA1 = 11,
+	USB_PID_SETUP = 13,
+	USB_PID_STALL = 14,
+	USB_PID_DATAERR = 15
+};
+
+enum usb_ep_pingpong {
+	USB_EP_PINGPONG_EVEN = 0,
+	USB_EP_PINGPONG_ODD = 1
+};
+
+enum usb_ep_dir {
+	USB_EP_RX = 0,
+	USB_EP_TX = 1
+};
+
+enum usb_data01 {
+	USB_DATA01_DATA0 = 0,
+	USB_DATA01_DATA1 = 1
+};
+
+enum {
+	EP0_BUFSIZE = 64
+};
+
+#endif
+