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Timer.h
00001 /* mbed Microcontroller Library 00002 * Copyright (c) 2006-2013 ARM Limited 00003 * 00004 * Licensed under the Apache License, Version 2.0 (the "License"); 00005 * you may not use this file except in compliance with the License. 00006 * You may obtain a copy of the License at 00007 * 00008 * http://www.apache.org/licenses/LICENSE-2.0 00009 * 00010 * Unless required by applicable law or agreed to in writing, software 00011 * distributed under the License is distributed on an "AS IS" BASIS, 00012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 00013 * See the License for the specific language governing permissions and 00014 * limitations under the License. 00015 */ 00016 #ifndef MBED_TIMER_H 00017 #define MBED_TIMER_H 00018 00019 #include "platform/platform.h" 00020 #include "hal/ticker_api.h" 00021 00022 namespace mbed { 00023 /** \addtogroup drivers */ 00024 /** @{*/ 00025 00026 /** A general purpose timer 00027 * 00028 * @Note Synchronization level: Interrupt safe 00029 * 00030 * Example: 00031 * @code 00032 * // Count the time to toggle a LED 00033 * 00034 * #include "mbed.h" 00035 * 00036 * Timer timer; 00037 * DigitalOut led(LED1); 00038 * int begin, end; 00039 * 00040 * int main() { 00041 * timer.start(); 00042 * begin = timer.read_us(); 00043 * led = !led; 00044 * end = timer.read_us(); 00045 * printf("Toggle the led takes %d us", end - begin); 00046 * } 00047 * @endcode 00048 */ 00049 class Timer { 00050 00051 public: 00052 Timer(); 00053 Timer(const ticker_data_t *data); 00054 00055 /** Start the timer 00056 */ 00057 void start(); 00058 00059 /** Stop the timer 00060 */ 00061 void stop(); 00062 00063 /** Reset the timer to 0. 00064 * 00065 * If it was already counting, it will continue 00066 */ 00067 void reset(); 00068 00069 /** Get the time passed in seconds 00070 */ 00071 float read(); 00072 00073 /** Get the time passed in mili-seconds 00074 */ 00075 int read_ms(); 00076 00077 /** Get the time passed in micro-seconds 00078 */ 00079 int read_us(); 00080 00081 /** An operator shorthand for read() 00082 */ 00083 operator float(); 00084 00085 protected: 00086 int slicetime(); 00087 int _running; // whether the timer is running 00088 unsigned int _start; // the start time of the latest slice 00089 int _time; // any accumulated time from previous slices 00090 const ticker_data_t *_ticker_data; 00091 }; 00092 00093 } // namespace mbed 00094 00095 #endif 00096 00097 /** @}*/
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