Diff: api/Ticker.h

Revision:

0:7e2bd16f80af

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/api/Ticker.h	Sat Jan 17 18:03:58 2015 +0000
@@ -0,0 +1,122 @@
+/* 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 "TimerEvent.h"
+#include "FunctionPointer.h"
+
+namespace mbed {
+
+/** A Ticker is used to call a function at a recurring interval
+ *
+ *  You can use as many seperate Ticker objects as you require.
+ *
+ * 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
+ */
+class Ticker : public TimerEvent {
+
+public:
+
+    /** Attach a function to be called by the Ticker, specifiying the interval in seconds
+     *
+     *  @param fptr pointer to the function to be called
+     *  @param t the time between calls in seconds
+     */
+    void attach(void (*fptr)(void), float t) {
+        attach_us(fptr, t * 1000000.0f);
+    }
+
+    /** Attach a member function to be called by the Ticker, specifiying the interval in seconds
+     *
+     *  @param tptr pointer to the object to call the member function on
+     *  @param mptr pointer to the member function to be called
+     *  @param t the time between calls in seconds
+     */
+    template<typename T>
+    void attach(T* tptr, void (T::*mptr)(void), float t) {
+        attach_us(tptr, mptr, t * 1000000.0f);
+    }
+
+    /** Attach a function to be called by the Ticker, specifiying the interval in micro-seconds
+     *
+     *  @param fptr pointer to the function to be called
+     *  @param t the time between calls in micro-seconds
+     */
+    void attach_us(void (*fptr)(void), timestamp_t t) {
+        _function.attach(fptr);
+        setup(t);
+    }
+
+    /** Attach a member function to be called by the Ticker, specifiying the interval in micro-seconds
+     *
+     *  @param tptr pointer to the object to call the member function on
+     *  @param mptr pointer to the member function to be called
+     *  @param t the time between calls in micro-seconds
+     */
+    template<typename T>
+    void attach_us(T* tptr, void (T::*mptr)(void), timestamp_t t) {
+        _function.attach(tptr, mptr);
+        setup(t);
+    }
+
+    virtual ~Ticker() {
+        detach();
+    }
+
+    /** Detach the function
+     */
+    void detach();
+
+protected:
+    void setup(timestamp_t t);
+    virtual void handler();
+
+protected:
+    timestamp_t     _delay;     /**< Time delay (in microseconds) for re-setting the multi-shot callback. */
+    FunctionPointer _function;  /**< Callback. */
+};
+
+} // namespace mbed
+
+#endif