Diff: mbed-os/drivers/Ticker.h

Revision:

0:9fca2b23d0ba

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed-os/drivers/Ticker.h	Sat Feb 23 12:13:36 2019 +0000
@@ -0,0 +1,164 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2006-2013 ARM Limited
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#ifndef MBED_TICKER_H
+#define MBED_TICKER_H
+
+#include "drivers/TimerEvent.h"
+#include "platform/Callback.h"
+#include "platform/mbed_toolchain.h"
+#include "platform/NonCopyable.h"
+#include "platform/mbed_sleep.h"
+#include "hal/lp_ticker_api.h"
+#include "platform/mbed_critical.h"
+
+namespace mbed {
+/** \addtogroup drivers */
+
+/** A Ticker is used to call a function at a recurring interval
+ *
+ *  You can use as many separate Ticker objects as you require.
+ *
+ * @note Synchronization level: Interrupt safe
+ *
+ * Example:
+ * @code
+ * // Toggle the blinking led after 5 seconds
+ *
+ * #include "mbed.h"
+ *
+ * Ticker timer;
+ * DigitalOut led1(LED1);
+ * DigitalOut led2(LED2);
+ *
+ * int flip = 0;
+ *
+ * void attime() {
+ *     flip = !flip;
+ * }
+ *
+ * int main() {
+ *     timer.attach(&attime, 5);
+ *     while(1) {
+ *         if(flip == 0) {
+ *             led1 = !led1;
+ *         } else {
+ *             led2 = !led2;
+ *         }
+ *         wait(0.2);
+ *     }
+ * }
+ * @endcode
+ * @ingroup drivers
+ */
+class Ticker : public TimerEvent, private NonCopyable<Ticker> {
+
+public:
+    Ticker() : TimerEvent(), _function(0), _lock_deepsleep(true) {
+    }
+
+    // When low power ticker is in use, then do not disable deep-sleep.
+    Ticker(const ticker_data_t *data) : TimerEvent(data), _function(0), _lock_deepsleep(true)  {
+        data->interface->init();
+#if DEVICE_LOWPOWERTIMER
+        _lock_deepsleep = (data != get_lp_ticker_data());
+#endif
+    }
+
+    /** Attach a function to be called by the Ticker, specifying the interval in seconds
+     *
+     *  @param func pointer to the function to be called
+     *  @param t the time between calls in seconds
+     */
+    void attach(Callback<void()> func, float t) {
+        attach_us(func, t * 1000000.0f);
+    }
+
+    /** Attach a member function to be called by the Ticker, specifying the interval in seconds
+     *
+     *  @param obj pointer to the object to call the member function on
+     *  @param method pointer to the member function to be called
+     *  @param t the time between calls in seconds
+     *  @deprecated
+     *      The attach function does not support cv-qualifiers. Replaced by
+     *      attach(callback(obj, method), t).
+     */
+    template<typename T, typename M>
+    MBED_DEPRECATED_SINCE("mbed-os-5.1",
+        "The attach function does not support cv-qualifiers. Replaced by "
+        "attach(callback(obj, method), t).")
+    void attach(T *obj, M method, float t) {
+        attach(callback(obj, method), t);
+    }
+
+    /** Attach a function to be called by the Ticker, specifying the interval in micro-seconds
+     *
+     *  @param func pointer to the function to be called
+     *  @param t the time between calls in micro-seconds
+     *
+     *  @note setting @a t to a value shorter that it takes to process the ticker callback
+     *  will cause the system to hang. Ticker callback will be called constantly with no time
+     *  for threads scheduling.
+     *
+     */
+    void attach_us(Callback<void()> func, us_timestamp_t t) {
+        core_util_critical_section_enter();
+        // lock only for the initial callback setup and this is not low power ticker
+        if(!_function && _lock_deepsleep) {
+            sleep_manager_lock_deep_sleep();
+        }
+        _function = func;
+        setup(t);
+        core_util_critical_section_exit();
+    }
+
+    /** Attach a member function to be called by the Ticker, specifying the interval in micro-seconds
+     *
+     *  @param obj pointer to the object to call the member function on
+     *  @param method pointer to the member function to be called
+     *  @param t the time between calls in micro-seconds
+     *  @deprecated
+     *      The attach_us function does not support cv-qualifiers. Replaced by
+     *      attach_us(callback(obj, method), t).
+     */
+    template<typename T, typename M>
+    MBED_DEPRECATED_SINCE("mbed-os-5.1",
+        "The attach_us function does not support cv-qualifiers. Replaced by "
+        "attach_us(callback(obj, method), t).")
+    void attach_us(T *obj, M method, us_timestamp_t t) {
+        attach_us(Callback<void()>(obj, method), t);
+    }
+
+    virtual ~Ticker() {
+        detach();
+    }
+
+    /** Detach the function
+     */
+    void detach();
+
+protected:
+    void setup(us_timestamp_t t);
+    virtual void handler();
+
+protected:
+    us_timestamp_t         _delay;  /**< Time delay (in microseconds) for re-setting the multi-shot callback. */
+    Callback<void()>    _function;  /**< Callback. */
+    bool          _lock_deepsleep;  /**< Flag which indicates if deep-sleep should be disabled. */
+};
+
+} // namespace mbed
+
+#endif