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diff --git a/lib/samd21/samd21a/include/instance/adc.h b/lib/samd21/samd21a/include/instance/adc.h
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+++ b/lib/samd21/samd21a/include/instance/adc.h
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+/**
+ * \file
+ *
+ * \brief Instance description for ADC
+ *
+ * Copyright (c) 2018 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 _SAMD21_ADC_INSTANCE_
+#define _SAMD21_ADC_INSTANCE_
+
+/* ========== Register definition for ADC peripheral ========== */
+#if (defined(__ASSEMBLY__) || defined(__IAR_SYSTEMS_ASM__))
+#define REG_ADC_CTRLA              (0x42004000) /**< \brief (ADC) Control A */
+#define REG_ADC_REFCTRL            (0x42004001) /**< \brief (ADC) Reference Control */
+#define REG_ADC_AVGCTRL            (0x42004002) /**< \brief (ADC) Average Control */
+#define REG_ADC_SAMPCTRL           (0x42004003) /**< \brief (ADC) Sampling Time Control */
+#define REG_ADC_CTRLB              (0x42004004) /**< \brief (ADC) Control B */
+#define REG_ADC_WINCTRL            (0x42004008) /**< \brief (ADC) Window Monitor Control */
+#define REG_ADC_SWTRIG             (0x4200400C) /**< \brief (ADC) Software Trigger */
+#define REG_ADC_INPUTCTRL          (0x42004010) /**< \brief (ADC) Input Control */
+#define REG_ADC_EVCTRL             (0x42004014) /**< \brief (ADC) Event Control */
+#define REG_ADC_INTENCLR           (0x42004016) /**< \brief (ADC) Interrupt Enable Clear */
+#define REG_ADC_INTENSET           (0x42004017) /**< \brief (ADC) Interrupt Enable Set */
+#define REG_ADC_INTFLAG            (0x42004018) /**< \brief (ADC) Interrupt Flag Status and Clear */
+#define REG_ADC_STATUS             (0x42004019) /**< \brief (ADC) Status */
+#define REG_ADC_RESULT             (0x4200401A) /**< \brief (ADC) Result */
+#define REG_ADC_WINLT              (0x4200401C) /**< \brief (ADC) Window Monitor Lower Threshold */
+#define REG_ADC_WINUT              (0x42004020) /**< \brief (ADC) Window Monitor Upper Threshold */
+#define REG_ADC_GAINCORR           (0x42004024) /**< \brief (ADC) Gain Correction */
+#define REG_ADC_OFFSETCORR         (0x42004026) /**< \brief (ADC) Offset Correction */
+#define REG_ADC_CALIB              (0x42004028) /**< \brief (ADC) Calibration */
+#define REG_ADC_DBGCTRL            (0x4200402A) /**< \brief (ADC) Debug Control */
+#else
+#define REG_ADC_CTRLA              (*(RwReg8 *)0x42004000UL) /**< \brief (ADC) Control A */
+#define REG_ADC_REFCTRL            (*(RwReg8 *)0x42004001UL) /**< \brief (ADC) Reference Control */
+#define REG_ADC_AVGCTRL            (*(RwReg8 *)0x42004002UL) /**< \brief (ADC) Average Control */
+#define REG_ADC_SAMPCTRL           (*(RwReg8 *)0x42004003UL) /**< \brief (ADC) Sampling Time Control */
+#define REG_ADC_CTRLB              (*(RwReg16*)0x42004004UL) /**< \brief (ADC) Control B */
+#define REG_ADC_WINCTRL            (*(RwReg8 *)0x42004008UL) /**< \brief (ADC) Window Monitor Control */
+#define REG_ADC_SWTRIG             (*(RwReg8 *)0x4200400CUL) /**< \brief (ADC) Software Trigger */
+#define REG_ADC_INPUTCTRL          (*(RwReg  *)0x42004010UL) /**< \brief (ADC) Input Control */
+#define REG_ADC_EVCTRL             (*(RwReg8 *)0x42004014UL) /**< \brief (ADC) Event Control */
+#define REG_ADC_INTENCLR           (*(RwReg8 *)0x42004016UL) /**< \brief (ADC) Interrupt Enable Clear */
+#define REG_ADC_INTENSET           (*(RwReg8 *)0x42004017UL) /**< \brief (ADC) Interrupt Enable Set */
+#define REG_ADC_INTFLAG            (*(RwReg8 *)0x42004018UL) /**< \brief (ADC) Interrupt Flag Status and Clear */
+#define REG_ADC_STATUS             (*(RoReg8 *)0x42004019UL) /**< \brief (ADC) Status */
+#define REG_ADC_RESULT             (*(RoReg16*)0x4200401AUL) /**< \brief (ADC) Result */
+#define REG_ADC_WINLT              (*(RwReg16*)0x4200401CUL) /**< \brief (ADC) Window Monitor Lower Threshold */
+#define REG_ADC_WINUT              (*(RwReg16*)0x42004020UL) /**< \brief (ADC) Window Monitor Upper Threshold */
+#define REG_ADC_GAINCORR           (*(RwReg16*)0x42004024UL) /**< \brief (ADC) Gain Correction */
+#define REG_ADC_OFFSETCORR         (*(RwReg16*)0x42004026UL) /**< \brief (ADC) Offset Correction */
+#define REG_ADC_CALIB              (*(RwReg16*)0x42004028UL) /**< \brief (ADC) Calibration */
+#define REG_ADC_DBGCTRL            (*(RwReg8 *)0x4200402AUL) /**< \brief (ADC) Debug Control */
+#endif /* (defined(__ASSEMBLY__) || defined(__IAR_SYSTEMS_ASM__)) */
+
+/* ========== Instance parameters for ADC peripheral ========== */
+#define ADC_DMAC_ID_RESRDY          39       // Index of DMA RESRDY trigger
+#define ADC_EXTCHANNEL_MSB          19       // Number of external channels
+#define ADC_GCLK_ID                 30       // Index of Generic Clock
+#define ADC_RESULT_BITS             16       // Size of RESULT.RESULT bitfield
+#define ADC_RESULT_MSB              15       // Size of Result
+
+#endif /* _SAMD21_ADC_INSTANCE_ */