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diff --git a/libmaple/nvic.h b/libmaple/nvic.h
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+/* *****************************************************************************
+ *  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/>.
+ *
+ *  Created: 12/18/09 02:36:47
+ *  Copyright (c) 2009 Perry L. Hung. All rights reserved.
+ *
+ * ****************************************************************************/
+
+/**
+ *  @file nvic.h
+ *
+ *  @brief Nested interrupt controller defines and prototypes
+ */
+
+#ifndef _NVIC_H_
+#define _NVIC_H_
+
+#define NVIC_INT_USBHP      19
+#define NVIC_INT_USBLP      20
+#define NVIC_EXTI1_OFFSET   (NVIC_ISER0 + 0x07)
+#define NVIC_EXTI9_5_OFFSET (NVIC_ISER0 + 0x17)
+
+/* NVIC Interrupt Enable registers  */
+#define NVIC_ISER0          0xE000E100
+#define NVIC_ISER1          0xE000E104
+#define NVIC_ISER2          0xE000E108
+#define NVIC_ISER3          0xE000E10C
+
+/* NVIC Interrupt Clear registers  */
+#define NVIC_ICER0          0xE000E180
+#define NVIC_ICER1          0xE000E184
+#define NVIC_ICER2          0xE000E188
+#define NVIC_ICER3          0xE000E18C
+
+/* System control registers  */
+#define SCB_VTOR            0xE000ED08  // Vector table offset register
+
+#define NVIC_VectTab_RAM             ((u32)0x20000000)
+#define NVIC_VectTab_FLASH           ((u32)0x08000000)
+
+#define NVIC_NR_INTERRUPTS        60
+
+#ifdef __cplusplus
+extern "C"{
+#endif
+
+void nvic_disable_interrupts(void);
+void nvic_enable_interrupt(uint32);
+
+#ifdef __cplusplus
+}
+#endif
+
+
+#endif
+