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diff --git a/lib/samd21/samd21a/include/instance/dac.h b/lib/samd21/samd21a/include/instance/dac.h
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+++ b/lib/samd21/samd21a/include/instance/dac.h
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+/**
+ * \file
+ *
+ * \brief Instance description for DAC
+ *
+ * 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_DAC_INSTANCE_
+#define _SAMD21_DAC_INSTANCE_
+
+/* ========== Register definition for DAC peripheral ========== */
+#if (defined(__ASSEMBLY__) || defined(__IAR_SYSTEMS_ASM__))
+#define REG_DAC_CTRLA              (0x42004800) /**< \brief (DAC) Control A */
+#define REG_DAC_CTRLB              (0x42004801) /**< \brief (DAC) Control B */
+#define REG_DAC_EVCTRL             (0x42004802) /**< \brief (DAC) Event Control */
+#define REG_DAC_INTENCLR           (0x42004804) /**< \brief (DAC) Interrupt Enable Clear */
+#define REG_DAC_INTENSET           (0x42004805) /**< \brief (DAC) Interrupt Enable Set */
+#define REG_DAC_INTFLAG            (0x42004806) /**< \brief (DAC) Interrupt Flag Status and Clear */
+#define REG_DAC_STATUS             (0x42004807) /**< \brief (DAC) Status */
+#define REG_DAC_DATA               (0x42004808) /**< \brief (DAC) Data */
+#define REG_DAC_DATABUF            (0x4200480C) /**< \brief (DAC) Data Buffer */
+#else
+#define REG_DAC_CTRLA              (*(RwReg8 *)0x42004800UL) /**< \brief (DAC) Control A */
+#define REG_DAC_CTRLB              (*(RwReg8 *)0x42004801UL) /**< \brief (DAC) Control B */
+#define REG_DAC_EVCTRL             (*(RwReg8 *)0x42004802UL) /**< \brief (DAC) Event Control */
+#define REG_DAC_INTENCLR           (*(RwReg8 *)0x42004804UL) /**< \brief (DAC) Interrupt Enable Clear */
+#define REG_DAC_INTENSET           (*(RwReg8 *)0x42004805UL) /**< \brief (DAC) Interrupt Enable Set */
+#define REG_DAC_INTFLAG            (*(RwReg8 *)0x42004806UL) /**< \brief (DAC) Interrupt Flag Status and Clear */
+#define REG_DAC_STATUS             (*(RoReg8 *)0x42004807UL) /**< \brief (DAC) Status */
+#define REG_DAC_DATA               (*(RwReg16*)0x42004808UL) /**< \brief (DAC) Data */
+#define REG_DAC_DATABUF            (*(RwReg16*)0x4200480CUL) /**< \brief (DAC) Data Buffer */
+#endif /* (defined(__ASSEMBLY__) || defined(__IAR_SYSTEMS_ASM__)) */
+
+/* ========== Instance parameters for DAC peripheral ========== */
+#define DAC_DMAC_ID_EMPTY           40       // Index of DMAC EMPTY trigger
+#define DAC_GCLK_ID                 33       // Index of Generic Clock
+
+#endif /* _SAMD21_DAC_INSTANCE_ */