mbed official / mbed-dev

mbed library sources. Supersedes mbed-src.

Dependents:   Nucleo_Hello_Encoder BLE_iBeaconScan AM1805_DEMO DISCO-F429ZI_ExportTemplate1 ... more

drivers/Ticker.h@186:707f6e361f3e, 2018-06-22 (annotated)

Committer:
Anna Bridge
Date:
Fri Jun 22 16:45:37 2018 +0100
Revision:
186:707f6e361f3e
Parent:
184:08ed48f1de7f
Child:
187:0387e8f68319
mbed-dev library. Release version 162

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 184:08ed48f1de7f 23 #include "platform/mbed_power_mgmt.h"
AnnaBridge 175:af195413fb11 24 #include "hal/lp_ticker_api.h"
AnnaBridge 175: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 175: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 175:af195413fb11 69 Ticker() : TimerEvent(), _function(0), _lock_deepsleep(true) {
<> 149:156823d33999 70 }
<> 149:156823d33999 71
AnnaBridge 175:af195413fb11 72 // When low power ticker is in use, then do not disable deep-sleep.
AnnaBridge 175:af195413fb11 73 Ticker(const ticker_data_t *data) : TimerEvent(data), _function(0), _lock_deepsleep(true) {
Anna Bridge 186:707f6e361f3e 74 #if DEVICE_LPTICKER
AnnaBridge 175:af195413fb11 75 _lock_deepsleep = (data != get_lp_ticker_data());
AnnaBridge 175:af195413fb11 76 #endif
<> 149:156823d33999 77 }
<> 149:156823d33999 78
AnnaBridge 175:af195413fb11 79 /** Attach a function to be called by the Ticker, specifying the interval in seconds
<> 149:156823d33999 80 *
<> 149:156823d33999 81 * @param func pointer to the function to be called
<> 149:156823d33999 82 * @param t the time between calls in seconds
<> 149:156823d33999 83 */
<> 149:156823d33999 84 void attach(Callback<void()> func, float t) {
<> 149:156823d33999 85 attach_us(func, t * 1000000.0f);
<> 149:156823d33999 86 }
<> 149:156823d33999 87
AnnaBridge 175:af195413fb11 88 /** Attach a member function to be called by the Ticker, specifying the interval in seconds
<> 149:156823d33999 89 *
<> 149:156823d33999 90 * @param obj pointer to the object to call the member function on
<> 149:156823d33999 91 * @param method pointer to the member function to be called
<> 149:156823d33999 92 * @param t the time between calls in seconds
<> 149:156823d33999 93 * @deprecated
<> 149:156823d33999 94 * The attach function does not support cv-qualifiers. Replaced by
<> 149:156823d33999 95 * attach(callback(obj, method), t).
<> 149:156823d33999 96 */
<> 149:156823d33999 97 template<typename T, typename M>
<> 149:156823d33999 98 MBED_DEPRECATED_SINCE("mbed-os-5.1",
<> 149:156823d33999 99 "The attach function does not support cv-qualifiers. Replaced by "
<> 149:156823d33999 100 "attach(callback(obj, method), t).")
<> 149:156823d33999 101 void attach(T *obj, M method, float t) {
<> 149:156823d33999 102 attach(callback(obj, method), t);
<> 149:156823d33999 103 }
<> 149:156823d33999 104
AnnaBridge 175:af195413fb11 105 /** Attach a function to be called by the Ticker, specifying the interval in micro-seconds
<> 149:156823d33999 106 *
AnnaBridge 167:e84263d55307 107 * @param func pointer to the function to be called
<> 149:156823d33999 108 * @param t the time between calls in micro-seconds
AnnaBridge 175:af195413fb11 109 *
AnnaBridge 175:af195413fb11 110 * @note setting @a t to a value shorter that it takes to process the ticker callback
AnnaBridge 175:af195413fb11 111 * will cause the system to hang. Ticker callback will be called constantly with no time
AnnaBridge 175:af195413fb11 112 * for threads scheduling.
AnnaBridge 175:af195413fb11 113 *
<> 149:156823d33999 114 */
AnnaBridge 167:e84263d55307 115 void attach_us(Callback<void()> func, us_timestamp_t t) {
AnnaBridge 175:af195413fb11 116 core_util_critical_section_enter();
AnnaBridge 175:af195413fb11 117 // lock only for the initial callback setup and this is not low power ticker
AnnaBridge 175:af195413fb11 118 if(!_function && _lock_deepsleep) {
AnnaBridge 174:b96e65c34a4d 119 sleep_manager_lock_deep_sleep();
AnnaBridge 174:b96e65c34a4d 120 }
<> 160:d5399cc887bb 121 _function = func;
<> 149:156823d33999 122 setup(t);
AnnaBridge 175:af195413fb11 123 core_util_critical_section_exit();
<> 149:156823d33999 124 }
<> 149:156823d33999 125
AnnaBridge 175:af195413fb11 126 /** Attach a member function to be called by the Ticker, specifying the interval in micro-seconds
<> 149:156823d33999 127 *
AnnaBridge 167:e84263d55307 128 * @param obj pointer to the object to call the member function on
AnnaBridge 167:e84263d55307 129 * @param method pointer to the member function to be called
<> 149:156823d33999 130 * @param t the time between calls in micro-seconds
<> 149:156823d33999 131 * @deprecated
<> 149:156823d33999 132 * The attach_us function does not support cv-qualifiers. Replaced by
<> 149:156823d33999 133 * attach_us(callback(obj, method), t).
<> 149:156823d33999 134 */
<> 149:156823d33999 135 template<typename T, typename M>
<> 149:156823d33999 136 MBED_DEPRECATED_SINCE("mbed-os-5.1",
<> 149:156823d33999 137 "The attach_us function does not support cv-qualifiers. Replaced by "
<> 149:156823d33999 138 "attach_us(callback(obj, method), t).")
AnnaBridge 167:e84263d55307 139 void attach_us(T *obj, M method, us_timestamp_t t) {
<> 149:156823d33999 140 attach_us(Callback<void()>(obj, method), t);
<> 149:156823d33999 141 }
<> 149:156823d33999 142
<> 149:156823d33999 143 virtual ~Ticker() {
<> 149:156823d33999 144 detach();
<> 149:156823d33999 145 }
<> 149:156823d33999 146
<> 149:156823d33999 147 /** Detach the function
<> 149:156823d33999 148 */
<> 149:156823d33999 149 void detach();
<> 149:156823d33999 150
<> 149:156823d33999 151 protected:
AnnaBridge 167:e84263d55307 152 void setup(us_timestamp_t t);
<> 149:156823d33999 153 virtual void handler();
<> 149:156823d33999 154
<> 149:156823d33999 155 protected:
AnnaBridge 167:e84263d55307 156 us_timestamp_t _delay; /**< Time delay (in microseconds) for re-setting the multi-shot callback. */
<> 149:156823d33999 157 Callback<void()> _function; /**< Callback. */
AnnaBridge 175:af195413fb11 158 bool _lock_deepsleep; /**< Flag which indicates if deep-sleep should be disabled. */
<> 149:156823d33999 159 };
<> 149:156823d33999 160
<> 149:156823d33999 161 } // namespace mbed
<> 149:156823d33999 162
<> 149:156823d33999 163 #endif