Mateusz Kowalik / Application

USB Serial application

Fork of USBSerial_HelloWorld by Samuel Mokrani

mbed-dev/drivers/Timer.cpp@11:b3f2a8bdac4d, 2017-12-16 (annotated)

Committer:
Zaitsev
Date:
Sat Dec 16 10:26:48 2017 +0000
Revision:
11:b3f2a8bdac4d
Parent:
10:41552d038a69 
A copy for D.S;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Zaitsev 10:41552d038a69 1 /* mbed Microcontroller Library
Zaitsev 10:41552d038a69 2 * Copyright (c) 2006-2013 ARM Limited
Zaitsev 10:41552d038a69 3 *
Zaitsev 10:41552d038a69 4 * Licensed under the Apache License, Version 2.0 (the "License");
Zaitsev 10:41552d038a69 5 * you may not use this file except in compliance with the License.
Zaitsev 10:41552d038a69 6 * You may obtain a copy of the License at
Zaitsev 10:41552d038a69 7 *
Zaitsev 10:41552d038a69 8 * http://www.apache.org/licenses/LICENSE-2.0
Zaitsev 10:41552d038a69 9 *
Zaitsev 10:41552d038a69 10 * Unless required by applicable law or agreed to in writing, software
Zaitsev 10:41552d038a69 11 * distributed under the License is distributed on an "AS IS" BASIS,
Zaitsev 10:41552d038a69 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
Zaitsev 10:41552d038a69 13 * See the License for the specific language governing permissions and
Zaitsev 10:41552d038a69 14 * limitations under the License.
Zaitsev 10:41552d038a69 15 */
Zaitsev 10:41552d038a69 16 #include "drivers/Timer.h"
Zaitsev 10:41552d038a69 17 #include "hal/ticker_api.h"
Zaitsev 10:41552d038a69 18 #include "hal/us_ticker_api.h"
Zaitsev 10:41552d038a69 19 #include "platform/critical.h"
Zaitsev 10:41552d038a69 20
Zaitsev 10:41552d038a69 21 namespace mbed {
Zaitsev 10:41552d038a69 22
Zaitsev 10:41552d038a69 23 Timer::Timer() : _running(), _start(), _time(), _ticker_data(get_us_ticker_data()) {
Zaitsev 10:41552d038a69 24 reset();
Zaitsev 10:41552d038a69 25 }
Zaitsev 10:41552d038a69 26
Zaitsev 10:41552d038a69 27 Timer::Timer(const ticker_data_t *data) : _running(), _start(), _time(), _ticker_data(data) {
Zaitsev 10:41552d038a69 28 reset();
Zaitsev 10:41552d038a69 29 }
Zaitsev 10:41552d038a69 30
Zaitsev 10:41552d038a69 31 void Timer::start() {
Zaitsev 10:41552d038a69 32 core_util_critical_section_enter();
Zaitsev 10:41552d038a69 33 if (!_running) {
Zaitsev 10:41552d038a69 34 _start = ticker_read(_ticker_data);
Zaitsev 10:41552d038a69 35 _running = 1;
Zaitsev 10:41552d038a69 36 }
Zaitsev 10:41552d038a69 37 core_util_critical_section_exit();
Zaitsev 10:41552d038a69 38 }
Zaitsev 10:41552d038a69 39
Zaitsev 10:41552d038a69 40 void Timer::stop() {
Zaitsev 10:41552d038a69 41 core_util_critical_section_enter();
Zaitsev 10:41552d038a69 42 _time += slicetime();
Zaitsev 10:41552d038a69 43 _running = 0;
Zaitsev 10:41552d038a69 44 core_util_critical_section_exit();
Zaitsev 10:41552d038a69 45 }
Zaitsev 10:41552d038a69 46
Zaitsev 10:41552d038a69 47 int Timer::read_us() {
Zaitsev 10:41552d038a69 48 core_util_critical_section_enter();
Zaitsev 10:41552d038a69 49 int time = _time + slicetime();
Zaitsev 10:41552d038a69 50 core_util_critical_section_exit();
Zaitsev 10:41552d038a69 51 return time;
Zaitsev 10:41552d038a69 52 }
Zaitsev 10:41552d038a69 53
Zaitsev 10:41552d038a69 54 float Timer::read() {
Zaitsev 10:41552d038a69 55 return (float)read_us() / 1000000.0f;
Zaitsev 10:41552d038a69 56 }
Zaitsev 10:41552d038a69 57
Zaitsev 10:41552d038a69 58 int Timer::read_ms() {
Zaitsev 10:41552d038a69 59 return read_us() / 1000;
Zaitsev 10:41552d038a69 60 }
Zaitsev 10:41552d038a69 61
Zaitsev 10:41552d038a69 62 int Timer::slicetime() {
Zaitsev 10:41552d038a69 63 core_util_critical_section_enter();
Zaitsev 10:41552d038a69 64 int ret = 0;
Zaitsev 10:41552d038a69 65 if (_running) {
Zaitsev 10:41552d038a69 66 ret = ticker_read(_ticker_data) - _start;
Zaitsev 10:41552d038a69 67 }
Zaitsev 10:41552d038a69 68 core_util_critical_section_exit();
Zaitsev 10:41552d038a69 69 return ret;
Zaitsev 10:41552d038a69 70 }
Zaitsev 10:41552d038a69 71
Zaitsev 10:41552d038a69 72 void Timer::reset() {
Zaitsev 10:41552d038a69 73 core_util_critical_section_enter();
Zaitsev 10:41552d038a69 74 _start = ticker_read(_ticker_data);
Zaitsev 10:41552d038a69 75 _time = 0;
Zaitsev 10:41552d038a69 76 core_util_critical_section_exit();
Zaitsev 10:41552d038a69 77 }
Zaitsev 10:41552d038a69 78
Zaitsev 10:41552d038a69 79 Timer::operator float() {
Zaitsev 10:41552d038a69 80 return read();
Zaitsev 10:41552d038a69 81 }
Zaitsev 10:41552d038a69 82
Zaitsev 10:41552d038a69 83 } // namespace mbed