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diff --git a/wirish/include/wirish/wirish_time.h b/wirish/include/wirish/wirish_time.h
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+/******************************************************************************
+ * The MIT License
+ *
+ * Copyright (c) 2010 Perry Hung.
+ *
+ * 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 wirish_time.h
+ * @brief Timing and delay functions.
+ */
+
+#ifndef _WIRISH_WIRISH_TIME_H_
+#define _WIRISH_WIRISH_TIME_H_
+
+#include <libmaple/libmaple_types.h>
+#include <libmaple/systick.h>
+
+#include <wirish/boards.h>
+
+#define US_PER_MS               1000
+
+/**
+ * Returns time (in milliseconds) since the beginning of program
+ * execution. On overflow, restarts at 0.
+ * @see micros()
+ */
+static inline uint32 millis(void) {
+    return systick_uptime();
+}
+
+/**
+ * Returns time (in microseconds) since the beginning of program
+ * execution.  On overflow, restarts at 0.
+ * @see millis()
+ */
+static inline uint32 micros(void) {
+    uint32 ms;
+    uint32 cycle_cnt;
+    uint32 res;
+
+    do {
+        ms = millis();
+        cycle_cnt = systick_get_count();
+    } while (ms != millis());
+
+    /* SYSTICK_RELOAD_VAL is 1 less than the number of cycles it
+     * actually takes to complete a SysTick reload */
+    res = (ms * US_PER_MS) +
+        (SYSTICK_RELOAD_VAL + 1 - cycle_cnt) / CYCLES_PER_MICROSECOND;
+
+    return res;
+}
+
+/**
+ * Delay for at least the given number of milliseconds.
+ *
+ * Interrupts, etc. may cause the actual number of milliseconds to
+ * exceed ms.  However, this function will return no less than ms
+ * milliseconds from the time it is called.
+ *
+ * @param ms the number of milliseconds to delay.
+ * @see delayMicroseconds()
+ */
+void delay(unsigned long ms);
+
+/**
+ * Delay for at least the given number of microseconds.
+ *
+ * Interrupts, etc. may cause the actual number of microseconds to
+ * exceed us.  However, this function will return no less than us
+ * microseconds from the time it is called.
+ *
+ * @param us the number of microseconds to delay.
+ * @see delay()
+ */
+void delayMicroseconds(uint32 us);
+
+#endif