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/* 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:
Ticker() : TimerEvent() {
}
Ticker(const ticker_data_t *data) : TimerEvent(data) {
}
/** 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
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