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diff --git a/libmaple/bkp.h b/libmaple/bkp.h
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+/******************************************************************************
+ * The MIT License
+ *
+ * Copyright (c) 2010 LeafLabs, LLC.
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use, copy,
+ * modify, merge, publish, distribute, sublicense, and/or sell copies
+ * of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *****************************************************************************/
+
+/**
+ * @file bkp.h
+ * @brief Backup register support.
+ */
+
+#ifndef _BKP_H_
+#define _BKP_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define BKP_BASE        0x40006C00
+#define BKP_RTCCR       (BKP_BASE + 0x2C)
+#define BKP_CR          (BKP_BASE + 0x30)
+#define BKP_CSR         (BKP_BASE + 0x34)
+
+/**
+ * Initialize backup interface. This function enables the power and
+ * backup interface clocks.  It does not enable write access to the
+ * backup registers.
+ */
+void bkp_init(void);
+
+/** Disable power and backup interface clocks. */
+void bkp_disable(void);
+
+/**
+ * Enable write access to the backup registers.  Backup interface must
+ * be initialized for subsequent register writes to work.
+ * @see bkp_init()
+ */
+void bkp_enable_writes(void);
+
+/**
+ * Disable write access to the backup registers.  Does not disable
+ * backup interface clocks.
+ */
+void bkp_disable_writes(void);
+
+/**
+ * Read a value from given backup data register.
+ * @param reg Data register to read, from 1 to NR_BKP_REGS (10 on Maple).
+ */
+uint16 bkp_read(uint8 reg);
+
+/**
+ * Write a value to given data register.  Backup interface must have
+ * been previously initialized, and write access to backup registers
+ * must be enabled.
+ * @param reg Data register to write, from 1 to NR_BKP_REGS (10 on Maple).
+ * @param val Value to write into the register.
+ */
+void bkp_write(uint8 reg, uint16 val);
+
+#ifdef __cplusplus
+} /* extern "C" */
+#endif
+
+#endif