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/* 
 * Copyright (c) 2015 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:
 * 
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 *      of conditions and the following disclaimer.
 *
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 *      integrated circuit in a product or a software update for such product, must reproduce 
 *      the above copyright notice, this list of conditions and the following disclaimer in 
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 *      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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/**
 * @defgroup nrf_wdt_hal WDT HAL
 * @{
 * @ingroup nrf_wdt
 *
 * @brief Hardware access layer for accessing the watchdog timer (WDT) peripheral.
 */

#ifndef NRF_WDT_H__
#define NRF_WDT_H__

#include <stddef.h>
#include <stdbool.h>
#include <stdint.h>

#include "nrf.h"

#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;
}


/**
 * @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;
}


#endif

/** @} */