John Karatka / mbed

mbed

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drivers/Ticker.h@182:57724642e740, 2018-02-16 (annotated)

Committer:
AnnaBridge
Date:
Fri Feb 16 16:09:33 2018 +0000
Revision:
182:57724642e740
Parent:
176:af195413fb11 
mbed-dev library. Release version 159.

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 #ifndef MBED_TICKER_H
<> 149:156823d33999 17 #define MBED_TICKER_H
<> 149:156823d33999 18
<> 149:156823d33999 19 #include "drivers/TimerEvent.h"
<> 149:156823d33999 20 #include "platform/Callback.h"
<> 160:d5399cc887bb 21 #include "platform/mbed_toolchain.h"
AnnaBridge 168:9672193075cf 22 #include "platform/NonCopyable.h"
AnnaBridge 175:b96e65c34a4d 23 #include "platform/mbed_sleep.h"
AnnaBridge 176:af195413fb11 24 #include "hal/lp_ticker_api.h"
AnnaBridge 176:af195413fb11 25 #include "platform/mbed_critical.h"
<> 149:156823d33999 26
<> 149:156823d33999 27 namespace mbed {
<> 149:156823d33999 28 /** \addtogroup drivers */
<> 149:156823d33999 29
<> 149:156823d33999 30 /** A Ticker is used to call a function at a recurring interval
<> 149:156823d33999 31 *
AnnaBridge 176:af195413fb11 32 * You can use as many separate Ticker objects as you require.
<> 149:156823d33999 33 *
AnnaBridge 167:e84263d55307 34 * @note Synchronization level: Interrupt safe
<> 149:156823d33999 35 *
<> 149:156823d33999 36 * Example:
<> 149:156823d33999 37 * @code
<> 149:156823d33999 38 * // Toggle the blinking led after 5 seconds
<> 149:156823d33999 39 *
<> 149:156823d33999 40 * #include "mbed.h"
<> 149:156823d33999 41 *
<> 149:156823d33999 42 * Ticker timer;
<> 149:156823d33999 43 * DigitalOut led1(LED1);
<> 149:156823d33999 44 * DigitalOut led2(LED2);
<> 149:156823d33999 45 *
<> 149:156823d33999 46 * int flip = 0;
<> 149:156823d33999 47 *
<> 149:156823d33999 48 * void attime() {
<> 149:156823d33999 49 * flip = !flip;
<> 149:156823d33999 50 * }
<> 149:156823d33999 51 *
<> 149:156823d33999 52 * int main() {
<> 149:156823d33999 53 * timer.attach(&attime, 5);
<> 149:156823d33999 54 * while(1) {
<> 149:156823d33999 55 * if(flip == 0) {
<> 149:156823d33999 56 * led1 = !led1;
<> 149:156823d33999 57 * } else {
<> 149:156823d33999 58 * led2 = !led2;
<> 149:156823d33999 59 * }
<> 149:156823d33999 60 * wait(0.2);
<> 149:156823d33999 61 * }
<> 149:156823d33999 62 * }
<> 149:156823d33999 63 * @endcode
AnnaBridge 167:e84263d55307 64 * @ingroup drivers
<> 149:156823d33999 65 */
AnnaBridge 168:9672193075cf 66 class Ticker : public TimerEvent, private NonCopyable<Ticker> {
<> 149:156823d33999 67
<> 149:156823d33999 68 public:
AnnaBridge 176:af195413fb11 69 Ticker() : TimerEvent(), _function(0), _lock_deepsleep(true) {
<> 149:156823d33999 70 }
<> 149:156823d33999 71
AnnaBridge 176:af195413fb11 72 // When low power ticker is in use, then do not disable deep-sleep.
AnnaBridge 176:af195413fb11 73 Ticker(const ticker_data_t *data) : TimerEvent(data), _function(0), _lock_deepsleep(true) {
<> 149:156823d33999 74 data->interface->init();
AnnaBridge 176:af195413fb11 75 #if DEVICE_LOWPOWERTIMER
AnnaBridge 176:af195413fb11 76 _lock_deepsleep = (data != get_lp_ticker_data());
AnnaBridge 176:af195413fb11 77 #endif
<> 149:156823d33999 78 }
<> 149:156823d33999 79
AnnaBridge 176:af195413fb11 80 /** Attach a function to be called by the Ticker, specifying the interval in seconds
<> 149:156823d33999 81 *
<> 149:156823d33999 82 * @param func pointer to the function to be called
<> 149:156823d33999 83 * @param t the time between calls in seconds
<> 149:156823d33999 84 */
<> 149:156823d33999 85 void attach(Callback<void()> func, float t) {
<> 149:156823d33999 86 attach_us(func, t * 1000000.0f);
<> 149:156823d33999 87 }
<> 149:156823d33999 88
AnnaBridge 176:af195413fb11 89 /** Attach a member function to be called by the Ticker, specifying the interval in seconds
<> 149:156823d33999 90 *
<> 149:156823d33999 91 * @param obj pointer to the object to call the member function on
<> 149:156823d33999 92 * @param method pointer to the member function to be called
<> 149:156823d33999 93 * @param t the time between calls in seconds
<> 149:156823d33999 94 * @deprecated
<> 149:156823d33999 95 * The attach function does not support cv-qualifiers. Replaced by
<> 149:156823d33999 96 * attach(callback(obj, method), t).
<> 149:156823d33999 97 */
<> 149:156823d33999 98 template<typename T, typename M>
<> 149:156823d33999 99 MBED_DEPRECATED_SINCE("mbed-os-5.1",
<> 149:156823d33999 100 "The attach function does not support cv-qualifiers. Replaced by "
<> 149:156823d33999 101 "attach(callback(obj, method), t).")
<> 149:156823d33999 102 void attach(T *obj, M method, float t) {
<> 149:156823d33999 103 attach(callback(obj, method), t);
<> 149:156823d33999 104 }
<> 149:156823d33999 105
AnnaBridge 176:af195413fb11 106 /** Attach a function to be called by the Ticker, specifying the interval in micro-seconds
<> 149:156823d33999 107 *
AnnaBridge 167:e84263d55307 108 * @param func pointer to the function to be called
<> 149:156823d33999 109 * @param t the time between calls in micro-seconds
AnnaBridge 176:af195413fb11 110 *
AnnaBridge 176:af195413fb11 111 * @note setting @a t to a value shorter that it takes to process the ticker callback
AnnaBridge 176:af195413fb11 112 * will cause the system to hang. Ticker callback will be called constantly with no time
AnnaBridge 176:af195413fb11 113 * for threads scheduling.
AnnaBridge 176:af195413fb11 114 *
<> 149:156823d33999 115 */
AnnaBridge 167:e84263d55307 116 void attach_us(Callback<void()> func, us_timestamp_t t) {
AnnaBridge 176:af195413fb11 117 core_util_critical_section_enter();
AnnaBridge 176:af195413fb11 118 // lock only for the initial callback setup and this is not low power ticker
AnnaBridge 176:af195413fb11 119 if(!_function && _lock_deepsleep) {
AnnaBridge 175:b96e65c34a4d 120 sleep_manager_lock_deep_sleep();
AnnaBridge 175:b96e65c34a4d 121 }
<> 160:d5399cc887bb 122 _function = func;
<> 149:156823d33999 123 setup(t);
AnnaBridge 176:af195413fb11 124 core_util_critical_section_exit();
<> 149:156823d33999 125 }
<> 149:156823d33999 126
AnnaBridge 176:af195413fb11 127 /** Attach a member function to be called by the Ticker, specifying the interval in micro-seconds
<> 149:156823d33999 128 *
AnnaBridge 167:e84263d55307 129 * @param obj pointer to the object to call the member function on
AnnaBridge 167:e84263d55307 130 * @param method pointer to the member function to be called
<> 149:156823d33999 131 * @param t the time between calls in micro-seconds
<> 149:156823d33999 132 * @deprecated
<> 149:156823d33999 133 * The attach_us function does not support cv-qualifiers. Replaced by
<> 149:156823d33999 134 * attach_us(callback(obj, method), t).
<> 149:156823d33999 135 */
<> 149:156823d33999 136 template<typename T, typename M>
<> 149:156823d33999 137 MBED_DEPRECATED_SINCE("mbed-os-5.1",
<> 149:156823d33999 138 "The attach_us function does not support cv-qualifiers. Replaced by "
<> 149:156823d33999 139 "attach_us(callback(obj, method), t).")
AnnaBridge 167:e84263d55307 140 void attach_us(T *obj, M method, us_timestamp_t t) {
<> 149:156823d33999 141 attach_us(Callback<void()>(obj, method), t);
<> 149:156823d33999 142 }
<> 149:156823d33999 143
<> 149:156823d33999 144 virtual ~Ticker() {
<> 149:156823d33999 145 detach();
<> 149:156823d33999 146 }
<> 149:156823d33999 147
<> 149:156823d33999 148 /** Detach the function
<> 149:156823d33999 149 */
<> 149:156823d33999 150 void detach();
<> 149:156823d33999 151
<> 149:156823d33999 152 protected:
AnnaBridge 167:e84263d55307 153 void setup(us_timestamp_t t);
<> 149:156823d33999 154 virtual void handler();
<> 149:156823d33999 155
<> 149:156823d33999 156 protected:
AnnaBridge 167:e84263d55307 157 us_timestamp_t _delay; /**< Time delay (in microseconds) for re-setting the multi-shot callback. */
<> 149:156823d33999 158 Callback<void()> _function; /**< Callback. */
AnnaBridge 176:af195413fb11 159 bool _lock_deepsleep; /**< Flag which indicates if deep-sleep should be disabled. */
<> 149:156823d33999 160 };
<> 149:156823d33999 161
<> 149:156823d33999 162 } // namespace mbed
<> 149:156823d33999 163
<> 149:156823d33999 164 #endif