text: /**
   * Copyright (c) 2015 - 2018, Nordic Semiconductor ASA
   * 
   * All rights reserved.
   * 
   * Redistribution and use in source and binary forms, with or without modification,
   * are permitted provided that the following conditions are met:
   * 
   * 1. Redistributions of source code must retain the above copyright notice, this
   *    list of conditions and the following disclaimer.
   * 
   * 2. Redistributions in binary form, except as embedded into a Nordic
   *    Semiconductor ASA integrated circuit in a product or a software update for
   *    such product, must reproduce the above copyright notice, this list of
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   * 
   * 3. Neither the name of Nordic Semiconductor ASA nor the names of its
   *    contributors may be used to endorse or promote products derived from this
   *    software without specific prior written permission.
   * 
   * 4. This software, with or without modification, must only be used with a
   *    Nordic Semiconductor ASA integrated circuit.
   * 
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   *    engineered, decompiled, modified and/or disassembled.
   * 
   * THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS
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   * OF MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE ARE
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   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
   * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   * 
   */
  
  #ifndef NRF_WDT_H__
  #define NRF_WDT_H__
  
  #include <nrfx.h>
  
  #ifdef __cplusplus
  extern "C" {
  #endif
  
  /**
   * @defgroup nrf_wdt_hal WDT HAL
   * @{
   * @ingroup nrf_wdt
   * @brief   Hardware access layer for managing the Watchdog Timer (WDT) peripheral.
   */
  
  #define NRF_WDT_CHANNEL_NUMBER 0x8UL
  #define NRF_WDT_RR_VALUE       0x6E524635UL /* Fixed value, shouldn't be modified.*/
  
  #define NRF_WDT_TASK_SET       1UL
  #define NRF_WDT_EVENT_CLEAR    0UL
  
  /**
   * @enum nrf_wdt_task_t
   * @brief WDT tasks.
   */
  typedef enum
  {
      /*lint -save -e30 -esym(628,__INTADDR__)*/
      NRF_WDT_TASK_START = offsetof(NRF_WDT_Type, TASKS_START), /**< Task for starting WDT. */
      /*lint -restore*/
  } nrf_wdt_task_t;
  
  /**
   * @enum nrf_wdt_event_t
   * @brief WDT events.
   */
  typedef enum
  {
      /*lint -save -e30*/
      NRF_WDT_EVENT_TIMEOUT = offsetof(NRF_WDT_Type, EVENTS_TIMEOUT), /**< Event from WDT time-out. */
      /*lint -restore*/
  } nrf_wdt_event_t;
  
  /**
   * @enum nrf_wdt_behaviour_t
   * @brief WDT behavior in CPU SLEEP or HALT mode.
   */
  typedef enum
  {
      NRF_WDT_BEHAVIOUR_RUN_SLEEP        = WDT_CONFIG_SLEEP_Msk,                       /**< WDT will run when CPU is in SLEEP mode. */
      NRF_WDT_BEHAVIOUR_RUN_HALT         = WDT_CONFIG_HALT_Msk,                        /**< WDT will run when CPU is in HALT mode. */
      NRF_WDT_BEHAVIOUR_RUN_SLEEP_HALT   = WDT_CONFIG_SLEEP_Msk | WDT_CONFIG_HALT_Msk, /**< WDT will run when CPU is in SLEEP or HALT mode. */
      NRF_WDT_BEHAVIOUR_PAUSE_SLEEP_HALT = 0,                                          /**< WDT will be paused when CPU is in SLEEP or HALT mode. */
  } nrf_wdt_behaviour_t;
  
  /**
   * @enum nrf_wdt_rr_register_t
   * @brief WDT reload request registers.
   */
  typedef enum
  {
      NRF_WDT_RR0 = 0, /**< Reload request register 0. */
      NRF_WDT_RR1,     /**< Reload request register 1. */
      NRF_WDT_RR2,     /**< Reload request register 2. */
      NRF_WDT_RR3,     /**< Reload request register 3. */
      NRF_WDT_RR4,     /**< Reload request register 4. */
      NRF_WDT_RR5,     /**< Reload request register 5. */
      NRF_WDT_RR6,     /**< Reload request register 6. */
      NRF_WDT_RR7      /**< Reload request register 7. */
  } nrf_wdt_rr_register_t;
  
  /**
   * @enum nrf_wdt_int_mask_t
   * @brief WDT interrupts.
   */
  typedef enum
  {
      NRF_WDT_INT_TIMEOUT_MASK = WDT_INTENSET_TIMEOUT_Msk, /**< WDT interrupt from time-out event. */
  } nrf_wdt_int_mask_t;
  
  /**
   * @brief Function for configuring the watchdog behavior when the CPU is sleeping or halted.
   *
   * @param behaviour Watchdog behavior when CPU is in SLEEP or HALT mode.
   */
  __STATIC_INLINE void nrf_wdt_behaviour_set(nrf_wdt_behaviour_t behaviour)
  {
      NRF_WDT->CONFIG = behaviour;
  }
  
  
  /**
   * @brief Function for starting the watchdog.
   *
   * @param[in]  task             Task.
   */
  __STATIC_INLINE void nrf_wdt_task_trigger(nrf_wdt_task_t task)
  {
      *((volatile uint32_t *)((uint8_t *)NRF_WDT + task)) = NRF_WDT_TASK_SET;
  }
  
  
  /**
   * @brief Function for clearing the WDT event.
   *
   * @param[in]  event       Event.
   */
  __STATIC_INLINE void nrf_wdt_event_clear(nrf_wdt_event_t event)
  {
      *((volatile uint32_t *)((uint8_t *)NRF_WDT + (uint32_t)event)) = NRF_WDT_EVENT_CLEAR;
  #if __CORTEX_M == 0x04
      volatile uint32_t dummy = *((volatile uint32_t *)((uint8_t *)NRF_WDT + (uint32_t)event));
      (void)dummy;
  #endif
  }
  
  
  /**
   * @brief Function for retrieving the state of the WDT event.
   *
   * @param[in]  event       Event.
   *
   * @retval     true              If the event is set.
   * @retval     false             If the event is not set.
   */
  __STATIC_INLINE bool nrf_wdt_event_check(nrf_wdt_event_t event)
  {
      return (bool)*((volatile uint32_t *)((uint8_t *)NRF_WDT + event));
  }
  
  
  /**
   * @brief Function for enabling a specific interrupt.
   *
   * @param[in]  int_mask         Interrupt.
   */
  __STATIC_INLINE void nrf_wdt_int_enable(uint32_t int_mask)
  {
      NRF_WDT->INTENSET = int_mask;
  }
  
  
  /**
   * @brief Function for retrieving the state of given interrupt.
   *
   * @param[in]  int_mask         Interrupt.
   *
   * @retval     true                   Interrupt is enabled.
   * @retval     false                  Interrupt is not enabled.
   */
  __STATIC_INLINE bool nrf_wdt_int_enable_check(uint32_t int_mask)
  {
      return (bool)(NRF_WDT->INTENSET & int_mask);
  }
  
  
  /**
   * @brief Function for disabling a specific interrupt.
   *
   * @param[in]  int_mask         Interrupt.
   */
  __STATIC_INLINE void nrf_wdt_int_disable(uint32_t int_mask)
  {
      NRF_WDT->INTENCLR = int_mask;
  }
  
  
  /**
   * @brief Function for returning the address of a specific WDT task register.
   *
   * @param[in]  task             Task.
   */
  __STATIC_INLINE uint32_t nrf_wdt_task_address_get(nrf_wdt_task_t task)
  {
      return ((uint32_t)NRF_WDT + task);
  }
  
  
  /**
   * @brief Function for returning the address of a specific WDT event register.
   *
   * @param[in]  event       Event.
   *
   * @retval     address of requested event register
   */
  __STATIC_INLINE uint32_t nrf_wdt_event_address_get(nrf_wdt_event_t event)
  {
      return ((uint32_t)NRF_WDT + event);
  }
  
  
  /**
   * @brief Function for retrieving the watchdog status.
   *
   * @retval     true             If the watchdog is started.
   * @retval     false            If the watchdog is not started.
   */
  __STATIC_INLINE bool nrf_wdt_started(void)
  {
      return (bool)(NRF_WDT->RUNSTATUS);
  }
  
  
  /**
   * @brief Function for retrieving the watchdog reload request status.
   *
   * @param[in]  rr_register      Reload request register to check.
   *
   * @retval     true             If a reload request is running.
   * @retval     false            If no reload request is running.
   */
  __STATIC_INLINE bool nrf_wdt_request_status(nrf_wdt_rr_register_t rr_register)
  {
      return (bool)(((NRF_WDT->REQSTATUS) >> rr_register) & 0x1UL);
  }
  
  
  /**
   * @brief Function for setting the watchdog reload value.
   *
   * @param[in]  reload_value     Watchdog counter initial value.
   */
  __STATIC_INLINE void nrf_wdt_reload_value_set(uint32_t reload_value)
  {
      NRF_WDT->CRV = reload_value;
  }
  
  
  /**
   * @brief Function for retrieving the watchdog reload value.
   *
   * @retval                      Reload value.
   */
  __STATIC_INLINE uint32_t nrf_wdt_reload_value_get(void)
  {
      return (uint32_t)NRF_WDT->CRV;
  }
  
  
  /**
   * @brief Function for enabling a specific reload request register.
   *
   * @param[in]  rr_register       Reload request register to enable.
   */
  __STATIC_INLINE void nrf_wdt_reload_request_enable(nrf_wdt_rr_register_t rr_register)
  {
      NRF_WDT->RREN |= 0x1UL << rr_register;
  }
  
  
  /**
   * @brief Function for disabling a specific reload request register.
   *
   * @param[in]  rr_register       Reload request register to disable.
   */
  __STATIC_INLINE void nrf_wdt_reload_request_disable(nrf_wdt_rr_register_t rr_register)
  {
      NRF_WDT->RREN &= ~(0x1UL << rr_register);
  }
  
  
  /**
   * @brief Function for retrieving the status of a specific reload request register.
   *
   * @param[in]  rr_register       Reload request register to check.
   *
   * @retval     true              If the reload request register is enabled.
   * @retval     false             If the reload request register is not enabled.
   */
  __STATIC_INLINE bool nrf_wdt_reload_request_is_enabled(nrf_wdt_rr_register_t rr_register)
  {
      return (bool)(NRF_WDT->RREN & (0x1UL << rr_register));
  }
  
  
  /**
   * @brief Function for setting a specific reload request register.
   *
   * @param[in]  rr_register       Reload request register to set.
   */
  __STATIC_INLINE void nrf_wdt_reload_request_set(nrf_wdt_rr_register_t rr_register)
  {
      NRF_WDT->RR[rr_register] = NRF_WDT_RR_VALUE;
  }
  
  /** @} */
  
  #ifdef __cplusplus
  }
  #endif
  
  #endif
  