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LowPowerTimeout

LowPowerTimeout class hierarchy

Use the LowPowerTimeout interface to set up an interrupt to call a function after a specified delay. You can create any number of LowPowerTimeout objects. This allows multiple outstanding interrupts at the same time. For more information about power management, please see our power management APIs.

Notes

  • No blocking code in ISR: Avoid any call to wait, infinite while loop or blocking calls in general.
  • No printf, malloc or new in ISR: Avoid any call to bulky library functions. In particular, certain library functions (such as printf, malloc and new) are not re-entrant, and their behavior could be corrupted when called from an ISR.

LowPowerTimeout class reference

Additional Inherited Members
 Public Member Functions inherited from mbed::Ticker
 Ticker (const ticker_data_t *data)
void attach (Callback< void()> func, float t)
template<typename T , typename M >
void attach (T *obj, M method, float t)
void attach_us (Callback< void()> func, us_timestamp_t t)
template<typename T , typename M >
void attach_us (T *obj, M method, us_timestamp_t t)
void detach ()
 Public Member Functions inherited from mbed::TimerEvent
 TimerEvent (const ticker_data_t *data)
virtual ~TimerEvent ()
 Static Public Member Functions inherited from mbed::TimerEvent
static void irq (uint32_t id)
 Protected Member Functions inherited from mbed::Ticker
void setup (us_timestamp_t t)
 Protected Member Functions inherited from mbed::TimerEvent
void insert (timestamp_t timestamp)
void insert_absolute (us_timestamp_t timestamp)
void remove ()
 Protected Attributes inherited from mbed::Ticker
us_timestamp_t _delay
Callback< void()> _function
bool _lock_deepsleep
 Protected Attributes inherited from mbed::TimerEvent
ticker_event_t event
const ticker_data_t_ticker_data

LowPowerTimeout example

Set up a time out to invert an LED after a given time:

/* mbed Example Program
 * Copyright (c) 2006-2014 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.
 */
#include "mbed.h"
 
LowPowerTimeout flipper;
DigitalOut led1(LED1);
DigitalOut led2(LED2);
 
void flip() {
    led2 = !led2;
}
 
int main() {
    led2 = 1;
    flipper.attach(&flip, 2.0); // setup flipper to call flip after 2 seconds
 
    // spin in a main loop. flipper will interrupt it to call flip
    while(1) {
        led1 = !led1;
        wait(0.2);
    }
}
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