Diff: mbed/drivers/Timer.h

Revision:

6:40e873bbc5f7

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed/drivers/Timer.h	Thu Mar 16 21:58:09 2017 +0900
@@ -0,0 +1,97 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2006-2013 ARM Limited
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#ifndef MBED_TIMER_H
+#define MBED_TIMER_H
+
+#include "platform/platform.h"
+#include "hal/ticker_api.h"
+
+namespace mbed {
+/** \addtogroup drivers */
+/** @{*/
+
+/** A general purpose timer
+ *
+ * @Note Synchronization level: Interrupt safe
+ *
+ * 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();
+    Timer(const ticker_data_t *data);
+
+    /** 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();
+
+    /** An operator shorthand for read()
+     */
+    operator float();
+
+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
+    const ticker_data_t *_ticker_data;
+};
+
+} // namespace mbed
+
+#endif
+
+/** @}*/