Amit Gandhi / mbed-dev

test

Fork of mbed-dev by mbed official

drivers/Timer.cpp@168:e84263d55307, 2017-06-21 (annotated)

Committer:
AnnaBridge
Date:
Wed Jun 21 17:46:44 2017 +0100
Revision:
168:e84263d55307
Parent:
160:d5399cc887bb
Child:
175:b96e65c34a4d
This updates the lib to the mbed lib v 145

Who changed what in which revision?

UserRevisionLine numberNew contents of line
<> 149:156823d33999 1 /* mbed Microcontroller Library
<> 149:156823d33999 2 * Copyright (c) 2006-2013 ARM Limited
<> 149:156823d33999 3 *
<> 149:156823d33999 4 * Licensed under the Apache License, Version 2.0 (the "License");
<> 149:156823d33999 5 * you may not use this file except in compliance with the License.
<> 149:156823d33999 6 * You may obtain a copy of the License at
<> 149:156823d33999 7 *
<> 149:156823d33999 8 * http://www.apache.org/licenses/LICENSE-2.0
<> 149:156823d33999 9 *
<> 149:156823d33999 10 * Unless required by applicable law or agreed to in writing, software
<> 149:156823d33999 11 * distributed under the License is distributed on an "AS IS" BASIS,
<> 149:156823d33999 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
<> 149:156823d33999 13 * See the License for the specific language governing permissions and
<> 149:156823d33999 14 * limitations under the License.
<> 149:156823d33999 15 */
<> 149:156823d33999 16 #include "drivers/Timer.h"
<> 149:156823d33999 17 #include "hal/ticker_api.h"
<> 149:156823d33999 18 #include "hal/us_ticker_api.h"
<> 160:d5399cc887bb 19 #include "platform/mbed_critical.h"
<> 149:156823d33999 20
<> 149:156823d33999 21 namespace mbed {
<> 149:156823d33999 22
<> 149:156823d33999 23 Timer::Timer() : _running(), _start(), _time(), _ticker_data(get_us_ticker_data()) {
<> 149:156823d33999 24 reset();
<> 149:156823d33999 25 }
<> 149:156823d33999 26
<> 149:156823d33999 27 Timer::Timer(const ticker_data_t *data) : _running(), _start(), _time(), _ticker_data(data) {
<> 149:156823d33999 28 reset();
<> 149:156823d33999 29 }
<> 149:156823d33999 30
<> 149:156823d33999 31 void Timer::start() {
<> 149:156823d33999 32 core_util_critical_section_enter();
<> 149:156823d33999 33 if (!_running) {
AnnaBridge 168:e84263d55307 34 _start = ticker_read_us(_ticker_data);
<> 149:156823d33999 35 _running = 1;
<> 149:156823d33999 36 }
<> 149:156823d33999 37 core_util_critical_section_exit();
<> 149:156823d33999 38 }
<> 149:156823d33999 39
<> 149:156823d33999 40 void Timer::stop() {
<> 149:156823d33999 41 core_util_critical_section_enter();
<> 149:156823d33999 42 _time += slicetime();
<> 149:156823d33999 43 _running = 0;
<> 149:156823d33999 44 core_util_critical_section_exit();
<> 149:156823d33999 45 }
<> 149:156823d33999 46
<> 149:156823d33999 47 int Timer::read_us() {
AnnaBridge 168:e84263d55307 48 return read_high_resolution_us();
<> 149:156823d33999 49 }
<> 149:156823d33999 50
<> 149:156823d33999 51 float Timer::read() {
<> 149:156823d33999 52 return (float)read_us() / 1000000.0f;
<> 149:156823d33999 53 }
<> 149:156823d33999 54
<> 149:156823d33999 55 int Timer::read_ms() {
AnnaBridge 168:e84263d55307 56 return read_high_resolution_us() / 1000;
<> 149:156823d33999 57 }
<> 149:156823d33999 58
AnnaBridge 168:e84263d55307 59 us_timestamp_t Timer::read_high_resolution_us() {
<> 149:156823d33999 60 core_util_critical_section_enter();
AnnaBridge 168:e84263d55307 61 us_timestamp_t time = _time + slicetime();
AnnaBridge 168:e84263d55307 62 core_util_critical_section_exit();
AnnaBridge 168:e84263d55307 63 return time;
AnnaBridge 168:e84263d55307 64 }
AnnaBridge 168:e84263d55307 65
AnnaBridge 168:e84263d55307 66 us_timestamp_t Timer::slicetime() {
AnnaBridge 168:e84263d55307 67 us_timestamp_t ret = 0;
AnnaBridge 168:e84263d55307 68 core_util_critical_section_enter();
<> 149:156823d33999 69 if (_running) {
AnnaBridge 168:e84263d55307 70 ret = ticker_read_us(_ticker_data) - _start;
<> 149:156823d33999 71 }
<> 149:156823d33999 72 core_util_critical_section_exit();
<> 149:156823d33999 73 return ret;
<> 149:156823d33999 74 }
<> 149:156823d33999 75
<> 149:156823d33999 76 void Timer::reset() {
<> 149:156823d33999 77 core_util_critical_section_enter();
AnnaBridge 168:e84263d55307 78 _start = ticker_read_us(_ticker_data);
<> 149:156823d33999 79 _time = 0;
<> 149:156823d33999 80 core_util_critical_section_exit();
<> 149:156823d33999 81 }
<> 149:156823d33999 82
<> 149:156823d33999 83 Timer::operator float() {
<> 149:156823d33999 84 return read();
<> 149:156823d33999 85 }
<> 149:156823d33999 86
<> 149:156823d33999 87 } // namespace mbed