text: 
  /** \addtogroup hal */
  /** @{*/
  /* mbed Microcontroller Library
   * Copyright (c) 2015 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_LPTICKER_API_H
  #define MBED_LPTICKER_API_H
  
  #include "device.h"
  
  #if DEVICE_LOWPOWERTIMER
  
  #include "hal/ticker_api.h"
  
  #ifdef __cplusplus
  extern "C" {
  #endif
  
  /**
   * \defgroup hal_LpTicker Low Power Ticker Functions
   * @{
   */
  
  typedef void (*ticker_irq_handler_type)(const ticker_data_t *const);
  
  /** Set low power ticker IRQ handler
   *
   * @param ticker_irq_handler IRQ handler to be connected
   *
   * @return previous ticker IRQ handler
   *
   * @note by default IRQ handler is set to ticker_irq_handler()
   * @note this function is primarily for testing purposes and it's not required part of HAL implementation
   *
   */
  ticker_irq_handler_type set_lp_ticker_irq_handler(ticker_irq_handler_type ticker_irq_handler);
  
  /** Get low power ticker's data
   *
   * @return The low power ticker data
   */
  const ticker_data_t* get_lp_ticker_data(void);
  
  /** The wrapper for ticker_irq_handler, to pass lp ticker's data
   *
   */
  void lp_ticker_irq_handler(void);
  
  /* HAL lp ticker */
  
  /** Initialize the low power ticker
   *
   */
  void lp_ticker_init(void);
  
  /** Read the current counter
   *
   * @return The current timer's counter value in microseconds
   */
  uint32_t lp_ticker_read(void);
  
  /** Set interrupt for specified timestamp
   *
   * @param timestamp The time in microseconds to be set
   */
  void lp_ticker_set_interrupt(timestamp_t timestamp);
  
  /** Disable low power ticker interrupt
   *
   */
  void lp_ticker_disable_interrupt(void);
  
  /** Clear the low power ticker interrupt
   *
   */
  void lp_ticker_clear_interrupt(void);
  
  /** Set pending interrupt that should be fired right away.
   * 
   * The ticker should be initialized prior calling this function.
   */
  void lp_ticker_fire_interrupt(void);
  
  /** Get frequency and counter bits of this ticker.
   *
   */
  const ticker_info_t* lp_ticker_get_info(void);
  
  /**@}*/
  
  #ifdef __cplusplus
  }
  #endif
  
  #endif
  
  #endif
  
  /** @}*/
  