mbed library sources: Modified to operate FRDM-KL25Z at 48MHz from internal 32kHz oscillator (nothing else changed).
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Timer.cpp
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 #include "Timer.h" 00017 #include "us_ticker_api.h" 00018 00019 namespace mbed { 00020 00021 Timer::Timer() { 00022 reset(); 00023 } 00024 00025 void Timer::start() { 00026 _start = us_ticker_read(); 00027 _running = 1; 00028 } 00029 00030 void Timer::stop() { 00031 _time += slicetime(); 00032 _running = 0; 00033 } 00034 00035 int Timer::read_us() { 00036 return _time + slicetime(); 00037 } 00038 00039 float Timer::read() { 00040 return (float)read_us() / 1000000.0f; 00041 } 00042 00043 int Timer::read_ms() { 00044 return read_us() / 1000; 00045 } 00046 00047 int Timer::slicetime() { 00048 if (_running) { 00049 return us_ticker_read() - _start; 00050 } else { 00051 return 0; 00052 } 00053 } 00054 00055 void Timer::reset() { 00056 _start = us_ticker_read(); 00057 _time = 0; 00058 } 00059 00060 #ifdef MBED_OPERATORS 00061 Timer::operator float() { 00062 return read(); 00063 } 00064 #endif 00065 00066 } // namespace mbed
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