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diff --git a/libmaple/flash.c b/libmaple/flash.c
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+/******************************************************************************
+ * The MIT License
+ *
+ * Copyright (c) 2010 Perry Hung.
+ * Copyright (c) 2011, 2012 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 libmaple/flash.c
+ * @brief Flash management functions
+ */
+
+#include <libmaple/libmaple_types.h>
+#include <libmaple/flash.h>
+
+/**
+ * @brief Set flash wait states
+ *
+ * Note that not all wait states are available on every MCU. See the
+ * Flash programming manual for your MCU for restrictions on the
+ * allowed value of wait_states for a given system clock (SYSCLK)
+ * frequency.
+ *
+ * @param wait_states number of wait states (one of
+ *                    FLASH_WAIT_STATE_0, FLASH_WAIT_STATE_1,
+ *                    ..., FLASH_WAIT_STATE_7).
+ */
+void flash_set_latency(uint32 wait_states) {
+    uint32 val = FLASH_BASE->ACR;
+
+    val &= ~FLASH_ACR_LATENCY;
+    val |= wait_states;
+
+    FLASH_BASE->ACR = val;
+}