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diff --git a/libmaple/util.h b/libmaple/util.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 02:39:27
+ *  Copyright (c) 2009 Perry L. Hung. All rights reserved.
+ *
+ * ****************************************************************************/
+
+/**
+ *  @file util.h
+ *
+ *  @brief Various macros and utility procedures.
+ */
+
+/* Generally "useful" utility procedures  */
+#ifndef _UTIL_H_
+#define _UTIL_H_
+#include <inttypes.h>
+
+#define MAPLE_DEBUG 1
+
+#define BIT(shift)                     (1 << (shift))
+#define BIT_MASK_SHIFT(mask, shift)    ((mask) << (shift))
+
+/* Return bits m to n of x  */
+#define GET_BITS(x, m, n) ((((uint32_t)x) << (31 - (n))) >> ((31 - (n)) + (m)))
+
+/* Bit-banding macros  */
+#define BITBAND_SRAM_REF   0x20000000
+#define BITBAND_SRAM_BASE  0x22000000
+#define BITBAND_SRAM(a,b) ((BITBAND_SRAM_BASE + (a-BITBAND_SRAM_REF)*32 + (b*4)))  // Convert SRAM address
+#define BITBAND_PERI_REF   0x40000000
+#define BITBAND_PERI_BASE  0x42000000
+#define BITBAND_PERI(a,b) ((BITBAND_PERI_BASE + (a-BITBAND_PERI_REF)*32 + (b*4)))  // Convert PERI address
+
+#define COUNTFLAG *((volatile unsigned char*) (BITBAND_PERI(SYSTICK_CSR,2)))
+
+#define REG_SET(reg, val)               (*(volatile uint32_t*)(reg)  = (val))
+#define REG_SET_BIT(reg, bit)           (*(volatile uint32_t*)(reg) |= BIT(bit))
+#define REG_CLEAR_BIT(reg, bit)         (*(volatile uint32_t*)(reg) &= ~BIT(bit))
+#define REG_SET_MASK(reg, mask)         (*(volatile uint32_t*)(reg) |= (uint32_t)(mask))
+#define REG_CLEAR_MASK(reg, mask)       (*(volatile uint32_t*)(reg) &= (uint32_t)~(mask))
+
+#define REG_GET(reg)                    *(volatile uint32_t*)(reg)
+
+
+#ifdef __cplusplus
+extern "C"{
+#endif
+
+void _fail(const char*, int, const char*);
+
+#ifdef __cplusplus
+} // extern "C"
+#endif
+
+
+/* Assert for sanity checks, undefine MAPLE_DEBUG to compile
+ * out these checks */
+#if MAPLE_DEBUG
+#define ASSERT(exp)         \
+    if (exp)              \
+        {}                  \
+    else                    \
+        _fail(__FILE__, __LINE__, #exp)
+#else
+#define ASSERT(exp) (void)((0))
+#endif
+
+#endif
+