1232
drivers/Ticker.h@0:06036f8bee2d, 2022-10-24 (annotated)
- Committer:
- ganlikun
- Date:
- Mon Oct 24 15:19:39 2022 +0000
- Revision:
- 0:06036f8bee2d
11
Who changed what in which revision?
User | Revision | Line number | New contents of line |
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ganlikun | 0:06036f8bee2d | 1 | /* mbed Microcontroller Library |
ganlikun | 0:06036f8bee2d | 2 | * Copyright (c) 2006-2013 ARM Limited |
ganlikun | 0:06036f8bee2d | 3 | * |
ganlikun | 0:06036f8bee2d | 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
ganlikun | 0:06036f8bee2d | 5 | * you may not use this file except in compliance with the License. |
ganlikun | 0:06036f8bee2d | 6 | * You may obtain a copy of the License at |
ganlikun | 0:06036f8bee2d | 7 | * |
ganlikun | 0:06036f8bee2d | 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
ganlikun | 0:06036f8bee2d | 9 | * |
ganlikun | 0:06036f8bee2d | 10 | * Unless required by applicable law or agreed to in writing, software |
ganlikun | 0:06036f8bee2d | 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
ganlikun | 0:06036f8bee2d | 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
ganlikun | 0:06036f8bee2d | 13 | * See the License for the specific language governing permissions and |
ganlikun | 0:06036f8bee2d | 14 | * limitations under the License. |
ganlikun | 0:06036f8bee2d | 15 | */ |
ganlikun | 0:06036f8bee2d | 16 | #ifndef MBED_TICKER_H |
ganlikun | 0:06036f8bee2d | 17 | #define MBED_TICKER_H |
ganlikun | 0:06036f8bee2d | 18 | |
ganlikun | 0:06036f8bee2d | 19 | #include "drivers/TimerEvent.h" |
ganlikun | 0:06036f8bee2d | 20 | #include "platform/Callback.h" |
ganlikun | 0:06036f8bee2d | 21 | #include "platform/mbed_toolchain.h" |
ganlikun | 0:06036f8bee2d | 22 | #include "platform/NonCopyable.h" |
ganlikun | 0:06036f8bee2d | 23 | #include "platform/mbed_sleep.h" |
ganlikun | 0:06036f8bee2d | 24 | #include "hal/lp_ticker_api.h" |
ganlikun | 0:06036f8bee2d | 25 | #include "platform/mbed_critical.h" |
ganlikun | 0:06036f8bee2d | 26 | |
ganlikun | 0:06036f8bee2d | 27 | namespace mbed { |
ganlikun | 0:06036f8bee2d | 28 | /** \addtogroup drivers */ |
ganlikun | 0:06036f8bee2d | 29 | |
ganlikun | 0:06036f8bee2d | 30 | /** A Ticker is used to call a function at a recurring interval |
ganlikun | 0:06036f8bee2d | 31 | * |
ganlikun | 0:06036f8bee2d | 32 | * You can use as many separate Ticker objects as you require. |
ganlikun | 0:06036f8bee2d | 33 | * |
ganlikun | 0:06036f8bee2d | 34 | * @note Synchronization level: Interrupt safe |
ganlikun | 0:06036f8bee2d | 35 | * |
ganlikun | 0:06036f8bee2d | 36 | * Example: |
ganlikun | 0:06036f8bee2d | 37 | * @code |
ganlikun | 0:06036f8bee2d | 38 | * // Toggle the blinking led after 5 seconds |
ganlikun | 0:06036f8bee2d | 39 | * |
ganlikun | 0:06036f8bee2d | 40 | * #include "mbed.h" |
ganlikun | 0:06036f8bee2d | 41 | * |
ganlikun | 0:06036f8bee2d | 42 | * Ticker timer; |
ganlikun | 0:06036f8bee2d | 43 | * DigitalOut led1(LED1); |
ganlikun | 0:06036f8bee2d | 44 | * DigitalOut led2(LED2); |
ganlikun | 0:06036f8bee2d | 45 | * |
ganlikun | 0:06036f8bee2d | 46 | * int flip = 0; |
ganlikun | 0:06036f8bee2d | 47 | * |
ganlikun | 0:06036f8bee2d | 48 | * void attime() { |
ganlikun | 0:06036f8bee2d | 49 | * flip = !flip; |
ganlikun | 0:06036f8bee2d | 50 | * } |
ganlikun | 0:06036f8bee2d | 51 | * |
ganlikun | 0:06036f8bee2d | 52 | * int main() { |
ganlikun | 0:06036f8bee2d | 53 | * timer.attach(&attime, 5); |
ganlikun | 0:06036f8bee2d | 54 | * while(1) { |
ganlikun | 0:06036f8bee2d | 55 | * if(flip == 0) { |
ganlikun | 0:06036f8bee2d | 56 | * led1 = !led1; |
ganlikun | 0:06036f8bee2d | 57 | * } else { |
ganlikun | 0:06036f8bee2d | 58 | * led2 = !led2; |
ganlikun | 0:06036f8bee2d | 59 | * } |
ganlikun | 0:06036f8bee2d | 60 | * wait(0.2); |
ganlikun | 0:06036f8bee2d | 61 | * } |
ganlikun | 0:06036f8bee2d | 62 | * } |
ganlikun | 0:06036f8bee2d | 63 | * @endcode |
ganlikun | 0:06036f8bee2d | 64 | * @ingroup drivers |
ganlikun | 0:06036f8bee2d | 65 | */ |
ganlikun | 0:06036f8bee2d | 66 | class Ticker : public TimerEvent, private NonCopyable<Ticker> { |
ganlikun | 0:06036f8bee2d | 67 | |
ganlikun | 0:06036f8bee2d | 68 | public: |
ganlikun | 0:06036f8bee2d | 69 | Ticker() : TimerEvent(), _function(0), _lock_deepsleep(true) { |
ganlikun | 0:06036f8bee2d | 70 | } |
ganlikun | 0:06036f8bee2d | 71 | |
ganlikun | 0:06036f8bee2d | 72 | // When low power ticker is in use, then do not disable deep-sleep. |
ganlikun | 0:06036f8bee2d | 73 | Ticker(const ticker_data_t *data) : TimerEvent(data), _function(0), _lock_deepsleep(true) { |
ganlikun | 0:06036f8bee2d | 74 | data->interface->init(); |
ganlikun | 0:06036f8bee2d | 75 | #if DEVICE_LOWPOWERTIMER |
ganlikun | 0:06036f8bee2d | 76 | _lock_deepsleep = (data != get_lp_ticker_data()); |
ganlikun | 0:06036f8bee2d | 77 | #endif |
ganlikun | 0:06036f8bee2d | 78 | } |
ganlikun | 0:06036f8bee2d | 79 | |
ganlikun | 0:06036f8bee2d | 80 | /** Attach a function to be called by the Ticker, specifying the interval in seconds |
ganlikun | 0:06036f8bee2d | 81 | * |
ganlikun | 0:06036f8bee2d | 82 | * @param func pointer to the function to be called |
ganlikun | 0:06036f8bee2d | 83 | * @param t the time between calls in seconds |
ganlikun | 0:06036f8bee2d | 84 | */ |
ganlikun | 0:06036f8bee2d | 85 | void attach(Callback<void()> func, float t) { |
ganlikun | 0:06036f8bee2d | 86 | attach_us(func, t * 1000000.0f); |
ganlikun | 0:06036f8bee2d | 87 | } |
ganlikun | 0:06036f8bee2d | 88 | |
ganlikun | 0:06036f8bee2d | 89 | /** Attach a member function to be called by the Ticker, specifying the interval in seconds |
ganlikun | 0:06036f8bee2d | 90 | * |
ganlikun | 0:06036f8bee2d | 91 | * @param obj pointer to the object to call the member function on |
ganlikun | 0:06036f8bee2d | 92 | * @param method pointer to the member function to be called |
ganlikun | 0:06036f8bee2d | 93 | * @param t the time between calls in seconds |
ganlikun | 0:06036f8bee2d | 94 | * @deprecated |
ganlikun | 0:06036f8bee2d | 95 | * The attach function does not support cv-qualifiers. Replaced by |
ganlikun | 0:06036f8bee2d | 96 | * attach(callback(obj, method), t). |
ganlikun | 0:06036f8bee2d | 97 | */ |
ganlikun | 0:06036f8bee2d | 98 | template<typename T, typename M> |
ganlikun | 0:06036f8bee2d | 99 | MBED_DEPRECATED_SINCE("mbed-os-5.1", |
ganlikun | 0:06036f8bee2d | 100 | "The attach function does not support cv-qualifiers. Replaced by " |
ganlikun | 0:06036f8bee2d | 101 | "attach(callback(obj, method), t).") |
ganlikun | 0:06036f8bee2d | 102 | void attach(T *obj, M method, float t) { |
ganlikun | 0:06036f8bee2d | 103 | attach(callback(obj, method), t); |
ganlikun | 0:06036f8bee2d | 104 | } |
ganlikun | 0:06036f8bee2d | 105 | |
ganlikun | 0:06036f8bee2d | 106 | /** Attach a function to be called by the Ticker, specifying the interval in micro-seconds |
ganlikun | 0:06036f8bee2d | 107 | * |
ganlikun | 0:06036f8bee2d | 108 | * @param func pointer to the function to be called |
ganlikun | 0:06036f8bee2d | 109 | * @param t the time between calls in micro-seconds |
ganlikun | 0:06036f8bee2d | 110 | * |
ganlikun | 0:06036f8bee2d | 111 | * @note setting @a t to a value shorter that it takes to process the ticker callback |
ganlikun | 0:06036f8bee2d | 112 | * will cause the system to hang. Ticker callback will be called constantly with no time |
ganlikun | 0:06036f8bee2d | 113 | * for threads scheduling. |
ganlikun | 0:06036f8bee2d | 114 | * |
ganlikun | 0:06036f8bee2d | 115 | */ |
ganlikun | 0:06036f8bee2d | 116 | void attach_us(Callback<void()> func, us_timestamp_t t) { |
ganlikun | 0:06036f8bee2d | 117 | core_util_critical_section_enter(); |
ganlikun | 0:06036f8bee2d | 118 | // lock only for the initial callback setup and this is not low power ticker |
ganlikun | 0:06036f8bee2d | 119 | if(!_function && _lock_deepsleep) { |
ganlikun | 0:06036f8bee2d | 120 | sleep_manager_lock_deep_sleep(); |
ganlikun | 0:06036f8bee2d | 121 | } |
ganlikun | 0:06036f8bee2d | 122 | _function = func; |
ganlikun | 0:06036f8bee2d | 123 | setup(t); |
ganlikun | 0:06036f8bee2d | 124 | core_util_critical_section_exit(); |
ganlikun | 0:06036f8bee2d | 125 | } |
ganlikun | 0:06036f8bee2d | 126 | |
ganlikun | 0:06036f8bee2d | 127 | /** Attach a member function to be called by the Ticker, specifying the interval in micro-seconds |
ganlikun | 0:06036f8bee2d | 128 | * |
ganlikun | 0:06036f8bee2d | 129 | * @param obj pointer to the object to call the member function on |
ganlikun | 0:06036f8bee2d | 130 | * @param method pointer to the member function to be called |
ganlikun | 0:06036f8bee2d | 131 | * @param t the time between calls in micro-seconds |
ganlikun | 0:06036f8bee2d | 132 | * @deprecated |
ganlikun | 0:06036f8bee2d | 133 | * The attach_us function does not support cv-qualifiers. Replaced by |
ganlikun | 0:06036f8bee2d | 134 | * attach_us(callback(obj, method), t). |
ganlikun | 0:06036f8bee2d | 135 | */ |
ganlikun | 0:06036f8bee2d | 136 | template<typename T, typename M> |
ganlikun | 0:06036f8bee2d | 137 | MBED_DEPRECATED_SINCE("mbed-os-5.1", |
ganlikun | 0:06036f8bee2d | 138 | "The attach_us function does not support cv-qualifiers. Replaced by " |
ganlikun | 0:06036f8bee2d | 139 | "attach_us(callback(obj, method), t).") |
ganlikun | 0:06036f8bee2d | 140 | void attach_us(T *obj, M method, us_timestamp_t t) { |
ganlikun | 0:06036f8bee2d | 141 | attach_us(Callback<void()>(obj, method), t); |
ganlikun | 0:06036f8bee2d | 142 | } |
ganlikun | 0:06036f8bee2d | 143 | |
ganlikun | 0:06036f8bee2d | 144 | virtual ~Ticker() { |
ganlikun | 0:06036f8bee2d | 145 | detach(); |
ganlikun | 0:06036f8bee2d | 146 | } |
ganlikun | 0:06036f8bee2d | 147 | |
ganlikun | 0:06036f8bee2d | 148 | /** Detach the function |
ganlikun | 0:06036f8bee2d | 149 | */ |
ganlikun | 0:06036f8bee2d | 150 | void detach(); |
ganlikun | 0:06036f8bee2d | 151 | |
ganlikun | 0:06036f8bee2d | 152 | protected: |
ganlikun | 0:06036f8bee2d | 153 | void setup(us_timestamp_t t); |
ganlikun | 0:06036f8bee2d | 154 | virtual void handler(); |
ganlikun | 0:06036f8bee2d | 155 | |
ganlikun | 0:06036f8bee2d | 156 | protected: |
ganlikun | 0:06036f8bee2d | 157 | us_timestamp_t _delay; /**< Time delay (in microseconds) for re-setting the multi-shot callback. */ |
ganlikun | 0:06036f8bee2d | 158 | Callback<void()> _function; /**< Callback. */ |
ganlikun | 0:06036f8bee2d | 159 | bool _lock_deepsleep; /**< Flag which indicates if deep-sleep should be disabled. */ |
ganlikun | 0:06036f8bee2d | 160 | }; |
ganlikun | 0:06036f8bee2d | 161 | |
ganlikun | 0:06036f8bee2d | 162 | } // namespace mbed |
ganlikun | 0:06036f8bee2d | 163 | |
ganlikun | 0:06036f8bee2d | 164 | #endif |