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/dfu.desc.c

@@ -0,0 +1,115 @@
+// Originally Generated from MCHCK Toolkit
+/* Copyright (c) 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/>.
+ */
+
+// ----- Local Includes -----
+
+#include "dfu.desc.h"
+
+
+
+// ----- Generated Includes -----
+
+#include <buildvars.h>
+
+
+
+// ----- Structs -----
+
+static const struct usb_config_1 usb_config_1 = {
+	.config = {
+		.bLength = sizeof(struct usb_desc_config_t),
+		.bDescriptorType = USB_DESC_CONFIG,
+		.wTotalLength = sizeof(struct usb_config_1),
+		.bNumInterfaces = 1,
+		.bConfigurationValue = 1,
+		.iConfiguration = 0,
+		.one = 1,
+		.bMaxPower = 100
+	},
+	.usb_function_0 = {
+		.iface = {
+			.bLength = sizeof(struct usb_desc_iface_t),
+			.bDescriptorType = USB_DESC_IFACE,
+			.bInterfaceNumber = 0,
+			.bAlternateSetting = 0,
+			.bNumEndpoints = 0,
+			.bInterfaceClass = USB_DEV_CLASS_APP,
+			.bInterfaceSubClass = USB_DEV_SUBCLASS_APP_DFU,
+			.bInterfaceProtocol = USB_DEV_PROTO_DFU_DFU,
+			.iInterface = 0
+		},
+
+	.dfu = {
+		.bLength = sizeof(struct dfu_desc_functional),
+		.bDescriptorType = {
+			.id = 0x1,
+			.type_type = USB_DESC_TYPE_CLASS
+		},
+		.will_detach = 1,
+		.manifestation_tolerant = 0,
+		.can_upload = 0,
+		.can_download = 1,
+		.wDetachTimeOut = 0,
+		.wTransferSize = USB_DFU_TRANSFER_SIZE,
+		.bcdDFUVersion = { .maj = 1, .min = 1 }
+	}
+},
+
+};
+
+static const struct usbd_config usbd_config_1 = {
+	.init = init_usb_bootloader,
+	.suspend = NULL,
+	.resume = NULL,
+	.desc = &usb_config_1.config,
+	.function = {&dfu_function},
+};
+
+static const struct usb_desc_dev_t dfu_device_dev_desc = {
+	.bLength = sizeof(struct usb_desc_dev_t),
+	.bDescriptorType = USB_DESC_DEV,
+	.bcdUSB = { .maj = 2 },
+	.bDeviceClass = USB_DEV_CLASS_SEE_IFACE,
+	.bDeviceSubClass = USB_DEV_SUBCLASS_SEE_IFACE,
+	.bDeviceProtocol = USB_DEV_PROTO_SEE_IFACE,
+	.bMaxPacketSize0 = EP0_BUFSIZE,
+	.idVendor = VENDOR_ID,
+	.idProduct = PRODUCT_ID,
+	.bcdDevice = { .raw = 0 },
+	.iManufacturer = 1,
+	.iProduct = 2,
+	.iSerialNumber = 3,
+	.bNumConfigurations = 1,
+};
+
+static const struct usb_desc_string_t * const dfu_device_str_desc[] = {
+	USB_DESC_STRING_LANG_ENUS,
+	USB_DESC_STRING(STR_MANUFACTURER),
+	USB_DESC_STRING(STR_PRODUCT),
+	USB_DESC_STRING(STR_SERIAL),
+	NULL
+};
+
+const struct usbd_device dfu_device = {
+	.dev_desc = &dfu_device_dev_desc,
+	.string_descs = dfu_device_str_desc,
+	.configs = {
+		&usbd_config_1,
+		NULL
+	}
+};
+