Massdrop keyboard support (#3780)

* Massdrop SAMD51

Massdrop SAMD51 keyboards initial project upload

* Removing relocated files

Removing files that were relocated and not deleted from previous location

* LED queue fix and cleaning

Cleaned some white space or comments.
Fix for LED I2C command queue.
Cleaned up interrupts.
Added debug function for printing numbers to scope through m15 line.

* Factory programmed serial usage

Ability to use factory programmed serial in hub and keyboard usb descriptors

* USB serial number and bugfix

Added support for factory programmed serial and usage.
Incorporated bootloader's conditional compiling to align project closer.
Fixed issue when USB device attempted to send before enabled.
General white space and comment cleanup.

* Project cleanup

Cleaned up project in terms of white space, commented code, and unecessary files.
NKRO keyboard is now using correct setreport although KBD was fine to use.
Fixed broken linkage to __xprintf for serial debug statements.

* Fix for extra keys

Fixed possible USB hang on extra keys report set missing

* I2C cleanup

I2C cleanup and file renames necessary for master branch merge

* Boot tracing and clocks cleanup

Added optional boot debug trace mode through debug LED codes.
General clock code cleanup.

* Relocate ARM/Atmel headers

Moved ARM/Atmel header folder from drivers to lib and made necessary makefile changes.

* Pull request changes

Pull request changes

* Keymap and compile flag fix

Keymap fix for momentary layer.
Potential compile flag fix for Travis CI failure.

* va_list include fix

Fix for va_list compile failure

* Include file case fixes

Fixes for include files with incorrect case

* ctrl and alt67 keyboard readme

Added ctrl and alt67 keyboard readme files

1 files changed, 73 insertions, 0 deletions

diff --git a/lib/arm_atsam/packs/atmel/SAMD51_DFP/1.0.70/include/instance/eic.h b/lib/arm_atsam/packs/atmel/SAMD51_DFP/1.0.70/include/instance/eic.h
new file mode 100644
index 000000000..d4d6d3eb4
--- /dev/null
+++ b/lib/arm_atsam/packs/atmel/SAMD51_DFP/1.0.70/include/instance/eic.h
@@ -0,0 +1,73 @@
+/**
+ * \file
+ *
+ * \brief Instance description for EIC
+ *
+ * Copyright (c) 2017 Microchip Technology Inc.
+ *
+ * \asf_license_start
+ *
+ * \page License
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the Licence at
+ * 
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an AS IS BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * \asf_license_stop
+ *
+ */
+
+#ifndef _SAMD51_EIC_INSTANCE_
+#define _SAMD51_EIC_INSTANCE_
+
+/* ========== Register definition for EIC peripheral ========== */
+#if (defined(__ASSEMBLY__) || defined(__IAR_SYSTEMS_ASM__))
+#define REG_EIC_CTRLA              (0x40002800) /**< \brief (EIC) Control A */
+#define REG_EIC_NMICTRL            (0x40002801) /**< \brief (EIC) Non-Maskable Interrupt Control */
+#define REG_EIC_NMIFLAG            (0x40002802) /**< \brief (EIC) Non-Maskable Interrupt Flag Status and Clear */
+#define REG_EIC_SYNCBUSY           (0x40002804) /**< \brief (EIC) Synchronization Busy */
+#define REG_EIC_EVCTRL             (0x40002808) /**< \brief (EIC) Event Control */
+#define REG_EIC_INTENCLR           (0x4000280C) /**< \brief (EIC) Interrupt Enable Clear */
+#define REG_EIC_INTENSET           (0x40002810) /**< \brief (EIC) Interrupt Enable Set */
+#define REG_EIC_INTFLAG            (0x40002814) /**< \brief (EIC) Interrupt Flag Status and Clear */
+#define REG_EIC_ASYNCH             (0x40002818) /**< \brief (EIC) External Interrupt Asynchronous Mode */
+#define REG_EIC_CONFIG0            (0x4000281C) /**< \brief (EIC) External Interrupt Sense Configuration 0 */
+#define REG_EIC_CONFIG1            (0x40002820) /**< \brief (EIC) External Interrupt Sense Configuration 1 */
+#define REG_EIC_DEBOUNCEN          (0x40002830) /**< \brief (EIC) Debouncer Enable */
+#define REG_EIC_DPRESCALER         (0x40002834) /**< \brief (EIC) Debouncer Prescaler */
+#define REG_EIC_PINSTATE           (0x40002838) /**< \brief (EIC) Pin State */
+#else
+#define REG_EIC_CTRLA              (*(RwReg8 *)0x40002800UL) /**< \brief (EIC) Control A */
+#define REG_EIC_NMICTRL            (*(RwReg8 *)0x40002801UL) /**< \brief (EIC) Non-Maskable Interrupt Control */
+#define REG_EIC_NMIFLAG            (*(RwReg16*)0x40002802UL) /**< \brief (EIC) Non-Maskable Interrupt Flag Status and Clear */
+#define REG_EIC_SYNCBUSY           (*(RoReg  *)0x40002804UL) /**< \brief (EIC) Synchronization Busy */
+#define REG_EIC_EVCTRL             (*(RwReg  *)0x40002808UL) /**< \brief (EIC) Event Control */
+#define REG_EIC_INTENCLR           (*(RwReg  *)0x4000280CUL) /**< \brief (EIC) Interrupt Enable Clear */
+#define REG_EIC_INTENSET           (*(RwReg  *)0x40002810UL) /**< \brief (EIC) Interrupt Enable Set */
+#define REG_EIC_INTFLAG            (*(RwReg  *)0x40002814UL) /**< \brief (EIC) Interrupt Flag Status and Clear */
+#define REG_EIC_ASYNCH             (*(RwReg  *)0x40002818UL) /**< \brief (EIC) External Interrupt Asynchronous Mode */
+#define REG_EIC_CONFIG0            (*(RwReg  *)0x4000281CUL) /**< \brief (EIC) External Interrupt Sense Configuration 0 */
+#define REG_EIC_CONFIG1            (*(RwReg  *)0x40002820UL) /**< \brief (EIC) External Interrupt Sense Configuration 1 */
+#define REG_EIC_DEBOUNCEN          (*(RwReg  *)0x40002830UL) /**< \brief (EIC) Debouncer Enable */
+#define REG_EIC_DPRESCALER         (*(RwReg  *)0x40002834UL) /**< \brief (EIC) Debouncer Prescaler */
+#define REG_EIC_PINSTATE           (*(RoReg  *)0x40002838UL) /**< \brief (EIC) Pin State */
+#endif /* (defined(__ASSEMBLY__) || defined(__IAR_SYSTEMS_ASM__)) */
+
+/* ========== Instance parameters for EIC peripheral ========== */
+#define EIC_EXTINT_NUM              16       // Number of external interrupts
+#define EIC_GCLK_ID                 4        // Generic Clock index
+#define EIC_NUMBER_OF_CONFIG_REGS   2        // Number of CONFIG registers
+#define EIC_NUMBER_OF_DPRESCALER_REGS 2        // Number of DPRESCALER pin groups
+#define EIC_NUMBER_OF_INTERRUPTS    16       // Number of external interrupts (obsolete)
+
+#endif /* _SAMD51_EIC_INSTANCE_ */