Steven Wray / mbed-dev

mbed library sources. Supersedes mbed-src.

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common/Timer.cpp@148:e70627d019e9, 2016-09-28 (annotated)

Committer:
StevieWray
Date:
Wed Sep 28 08:45:18 2016 +0000
Revision:
148:e70627d019e9
Parent:
144:ef7eb2e8f9f7 
Fixed DAC output on STM32F3 boards to allow 3 outputs

Who changed what in which revision?

UserRevisionLine numberNew contents of line
<> 144:ef7eb2e8f9f7 1 /* mbed Microcontroller Library
<> 144:ef7eb2e8f9f7 2 * Copyright (c) 2006-2013 ARM Limited
<> 144:ef7eb2e8f9f7 3 *
<> 144:ef7eb2e8f9f7 4 * Licensed under the Apache License, Version 2.0 (the "License");
<> 144:ef7eb2e8f9f7 5 * you may not use this file except in compliance with the License.
<> 144:ef7eb2e8f9f7 6 * You may obtain a copy of the License at
<> 144:ef7eb2e8f9f7 7 *
<> 144:ef7eb2e8f9f7 8 * http://www.apache.org/licenses/LICENSE-2.0
<> 144:ef7eb2e8f9f7 9 *
<> 144:ef7eb2e8f9f7 10 * Unless required by applicable law or agreed to in writing, software
<> 144:ef7eb2e8f9f7 11 * distributed under the License is distributed on an "AS IS" BASIS,
<> 144:ef7eb2e8f9f7 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
<> 144:ef7eb2e8f9f7 13 * See the License for the specific language governing permissions and
<> 144:ef7eb2e8f9f7 14 * limitations under the License.
<> 144:ef7eb2e8f9f7 15 */
<> 144:ef7eb2e8f9f7 16 #include "Timer.h"
<> 144:ef7eb2e8f9f7 17 #include "ticker_api.h"
<> 144:ef7eb2e8f9f7 18 #include "us_ticker_api.h"
<> 144:ef7eb2e8f9f7 19 #include "critical.h"
<> 144:ef7eb2e8f9f7 20
<> 144:ef7eb2e8f9f7 21 namespace mbed {
<> 144:ef7eb2e8f9f7 22
<> 144:ef7eb2e8f9f7 23 Timer::Timer() : _running(), _start(), _time(), _ticker_data(get_us_ticker_data()) {
<> 144:ef7eb2e8f9f7 24 reset();
<> 144:ef7eb2e8f9f7 25 }
<> 144:ef7eb2e8f9f7 26
<> 144:ef7eb2e8f9f7 27 Timer::Timer(const ticker_data_t *data) : _running(), _start(), _time(), _ticker_data(data) {
<> 144:ef7eb2e8f9f7 28 reset();
<> 144:ef7eb2e8f9f7 29 }
<> 144:ef7eb2e8f9f7 30
<> 144:ef7eb2e8f9f7 31 void Timer::start() {
<> 144:ef7eb2e8f9f7 32 core_util_critical_section_enter();
<> 144:ef7eb2e8f9f7 33 if (!_running) {
<> 144:ef7eb2e8f9f7 34 _start = ticker_read(_ticker_data);
<> 144:ef7eb2e8f9f7 35 _running = 1;
<> 144:ef7eb2e8f9f7 36 }
<> 144:ef7eb2e8f9f7 37 core_util_critical_section_exit();
<> 144:ef7eb2e8f9f7 38 }
<> 144:ef7eb2e8f9f7 39
<> 144:ef7eb2e8f9f7 40 void Timer::stop() {
<> 144:ef7eb2e8f9f7 41 core_util_critical_section_enter();
<> 144:ef7eb2e8f9f7 42 _time += slicetime();
<> 144:ef7eb2e8f9f7 43 _running = 0;
<> 144:ef7eb2e8f9f7 44 core_util_critical_section_exit();
<> 144:ef7eb2e8f9f7 45 }
<> 144:ef7eb2e8f9f7 46
<> 144:ef7eb2e8f9f7 47 int Timer::read_us() {
<> 144:ef7eb2e8f9f7 48 core_util_critical_section_enter();
<> 144:ef7eb2e8f9f7 49 int time = _time + slicetime();
<> 144:ef7eb2e8f9f7 50 core_util_critical_section_exit();
<> 144:ef7eb2e8f9f7 51 return time;
<> 144:ef7eb2e8f9f7 52 }
<> 144:ef7eb2e8f9f7 53
<> 144:ef7eb2e8f9f7 54 float Timer::read() {
<> 144:ef7eb2e8f9f7 55 return (float)read_us() / 1000000.0f;
<> 144:ef7eb2e8f9f7 56 }
<> 144:ef7eb2e8f9f7 57
<> 144:ef7eb2e8f9f7 58 int Timer::read_ms() {
<> 144:ef7eb2e8f9f7 59 return read_us() / 1000;
<> 144:ef7eb2e8f9f7 60 }
<> 144:ef7eb2e8f9f7 61
<> 144:ef7eb2e8f9f7 62 int Timer::slicetime() {
<> 144:ef7eb2e8f9f7 63 core_util_critical_section_enter();
<> 144:ef7eb2e8f9f7 64 int ret = 0;
<> 144:ef7eb2e8f9f7 65 if (_running) {
<> 144:ef7eb2e8f9f7 66 ret = ticker_read(_ticker_data) - _start;
<> 144:ef7eb2e8f9f7 67 }
<> 144:ef7eb2e8f9f7 68 core_util_critical_section_exit();
<> 144:ef7eb2e8f9f7 69 return ret;
<> 144:ef7eb2e8f9f7 70 }
<> 144:ef7eb2e8f9f7 71
<> 144:ef7eb2e8f9f7 72 void Timer::reset() {
<> 144:ef7eb2e8f9f7 73 core_util_critical_section_enter();
<> 144:ef7eb2e8f9f7 74 _start = ticker_read(_ticker_data);
<> 144:ef7eb2e8f9f7 75 _time = 0;
<> 144:ef7eb2e8f9f7 76 core_util_critical_section_exit();
<> 144:ef7eb2e8f9f7 77 }
<> 144:ef7eb2e8f9f7 78
<> 144:ef7eb2e8f9f7 79 Timer::operator float() {
<> 144:ef7eb2e8f9f7 80 return read();
<> 144:ef7eb2e8f9f7 81 }
<> 144:ef7eb2e8f9f7 82
<> 144:ef7eb2e8f9f7 83 } // namespace mbed