Diff: cpp/Timer.h

Revision:

0:fd0d7bdfcdc2

Child:

2:143cac498751

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/cpp/Timer.h	Tue Nov 20 17:24:08 2012 +0000
@@ -0,0 +1,94 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2006-2012 ARM Limited
+ *
+ * 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.
+ */
+#ifndef MBED_TIMER_H
+#define MBED_TIMER_H
+
+#include "platform.h"
+
+namespace mbed {
+
+/** A general purpose timer 
+ *
+ * Example:
+ * @code
+ * // Count the time to toggle a LED
+ *
+ * #include "mbed.h"
+ * 
+ * Timer timer;
+ * DigitalOut led(LED1);
+ * int begin, end;
+ * 
+ * int main() {
+ *     timer.start();
+ *     begin = timer.read_us();
+ *     led = !led;
+ *     end = timer.read_us();
+ *     printf("Toggle the led takes %d us", end - begin);
+ * }
+ * @endcode
+ */
+class Timer {
+
+public:
+    Timer();
+    
+    /** Start the timer
+     */
+    void start(); 
+
+    /** Stop the timer
+     */
+    void stop(); 
+
+    /** Reset the timer to 0. 
+     *
+     * If it was already counting, it will continue
+     */
+    void reset();
+
+    /** Get the time passed in seconds
+     */
+    float read();
+
+    /** Get the time passed in mili-seconds
+     */
+    int read_ms();
+
+    /** Get the time passed in micro-seconds
+     */
+    int read_us();
+
+#ifdef MBED_OPERATORS 
+    operator float();
+#endif
+
+protected:
+    int slicetime();
+    int _running;          // whether the timer is running
+    unsigned int _start;   // the start time of the latest slice
+    int _time;             // any accumulated time from previous slices
+};
+
+} // namespace mbed
+
+#endif