/**
 * Copyright (c) 2015 - 2017, 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
 *    conditions and the following disclaimer in the documentation and/or other
 *    materials provided with the distribution.
 * 
 * 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.
 * 
 * 5. Any software provided in binary form under this license must not be reverse
 *    engineered, decompiled, modified and/or disassembled.
 * 
 * THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS
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 */

#ifndef NRF_DRV_COMP_H__
#define NRF_DRV_COMP_H__

#include "sdk_config.h"
#include "nrf_comp.h"
#include "sdk_errors.h"
#include "nrf_drv_common.h"
#include "app_util_platform.h"

#ifdef __cplusplus
extern "C" {
#endif

/**
 * @addtogroup nrf_comp COMP HAL and driver
 * @ingroup nrf_drivers
 * @brief @tagAPI52 Comparator (COMP) APIs.
 * @details The COMP HAL provides basic APIs for accessing the registers of Comparator.
 * The COMP driver provides APIs on a higher level.
 *
 * @defgroup nrf_drv_comp COMP driver
 * @{
 * @ingroup nrf_comp
 * @brief @tagAPI52 Comparator (COMP) driver.
 */

/**
 * @brief Macro to convert the threshold voltage to an integer value (needed by the COMP_TH register).
 *
 * @param[in] vol             Voltage to be changed to COMP_TH register value. This value must not be smaller than
 *                            reference voltage divided by 64.
 * @param[in] ref             Reference voltage.
 */
#define VOLTAGE_THRESHOLD_TO_INT(vol, ref) (uint8_t)(((vol) > ((ref) / 64)) ? (ROUNDED_DIV((vol) * 64,(ref)) - 1) : 0)

/**@brief COMP event handler function type.
 * @param[in] event  COMP event.
 */
typedef void (* comp_events_handler_t)(nrf_comp_event_t event);

/**
 * @enum nrf_drv_comp_short_mask_t
 * @brief COMP shortcut masks.
 */
typedef enum
{
    NRF_DRV_COMP_SHORT_STOP_AFTER_CROSS_EVT = COMP_SHORTS_CROSS_STOP_Msk,        /*!< Shortcut between the CROSS event and the STOP task. */
    NRF_DRV_COMP_SHORT_STOP_AFTER_UP_EVT = COMP_SHORTS_UP_STOP_Msk,              /*!< Shortcut between the UP event and the STOP task. */
    NRF_DRV_COMP_SHORT_STOP_AFTER_DOWN_EVT = COMP_SHORTS_DOWN_STOP_Msk           /*!< Shortcut between the DOWN event and the STOP task. */
}nrf_drv_comp_short_mask_t;

/**
 * @enum nrf_drv_comp_evt_en_mask_t
 * @brief COMP events masks.
 */
typedef enum
{
    NRF_DRV_COMP_EVT_EN_CROSS_MASK = COMP_INTENSET_CROSS_Msk,                /*!< CROSS event (generated after VIN+ == VIN-). */
    NRF_DRV_COMP_EVT_EN_UP_MASK = COMP_INTENSET_UP_Msk,                      /*!< UP event (generated when VIN+ crosses VIN- while increasing). */
    NRF_DRV_COMP_EVT_EN_DOWN_MASK = COMP_INTENSET_DOWN_Msk,                  /*!< DOWN event (generated when VIN+ crosses VIN- while decreasing). */
    NRF_DRV_COMP_EVT_EN_READY_MASK = COMP_INTENSET_READY_Msk                 /*!< READY event (generated when the module is ready). */
}nrf_drv_comp_evt_en_mask_t;

/**@brief COMP configuration.
 */
typedef struct
{
    nrf_comp_ref_t           reference;          /**< Reference selection. */
    nrf_comp_ext_ref_t       ext_ref;            /**< External analog reference selection. */
    nrf_comp_main_mode_t     main_mode;          /**< Main operation mode. */
    nrf_comp_th_t            threshold;          /**< Structure holding THDOWN and THUP values needed by the COMP_TH register. */
    nrf_comp_sp_mode_t       speed_mode;         /**< Speed and power mode. */
    nrf_comp_hyst_t          hyst;               /**< Comparator hysteresis.*/
    nrf_isource_t            isource;            /**< Current source selected on analog input. */
    nrf_comp_input_t         input;              /**< Input to be monitored. */
    uint8_t                  interrupt_priority; /**< Interrupt priority. */
} nrf_drv_comp_config_t;

/** @brief COMP threshold default configuration. */
#define COMP_CONFIG_TH                                  \
{                                                       \
    .th_down = VOLTAGE_THRESHOLD_TO_INT(0.5, 1.8),      \
    .th_up = VOLTAGE_THRESHOLD_TO_INT(1.5, 1.8)         \
}

/** @brief COMP driver default configuration including the COMP HAL configuration. */
#define NRF_DRV_COMP_DEFAULT_CONFIG(INPUT)                                     \
{                                                                                   \
    .reference          = (nrf_comp_ref_t)COMP_CONFIG_REF,                          \
    .main_mode          = (nrf_comp_main_mode_t)COMP_CONFIG_MAIN_MODE,              \
    .threshold          = COMP_CONFIG_TH,                                           \
    .speed_mode         = (nrf_comp_sp_mode_t)COMP_CONFIG_SPEED_MODE,               \
    .hyst               = (nrf_comp_hyst_t)COMP_CONFIG_HYST,                        \
    .isource            = (nrf_isource_t)COMP_CONFIG_ISOURCE,                       \
    .input              = (nrf_comp_input_t)INPUT,                                  \
    .interrupt_priority = COMP_CONFIG_IRQ_PRIORITY                                  \
}

/**
 * @brief Function for initializing the COMP driver.
 *
 * This function initializes the COMP driver, but does not enable the peripheral or any interrupts.
 * To start the driver, call the function @ref nrf_drv_comp_start() after initialization.
 *
 * If no configuration structure is provided, the driver is initialized with the default settings.
 *
 * @param[in] p_config              Initial configuration. If NULL, the default configuration is used.
 * @param[in] event_handler         Handler function.
 *
 * @retval NRF_ERROR_INVALID_PARAM     If the configuration is invalid.
 * @retval NRF_ERROR_INVALID_STATE     If the driver has already been initialized.
 * @retval NRF_ERROR_BUSY              If the LPCOMP driver is initialized.
 */
ret_code_t nrf_drv_comp_init(const nrf_drv_comp_config_t * p_config,
                             comp_events_handler_t   event_handler);


/**
 *  @brief Function for uninitializing the COMP driver.
 *
 *  This function uninitializes the COMP driver. The COMP peripheral and
 *  its interrupts are disabled, and local variables are cleaned. After this call, you must
 *  initialize the driver again by calling nrf_drv_comp_init() if you want to use it.
 *
 *  @sa nrf_drv_comp_stop()
 */
void     nrf_drv_comp_uninit(void);

/**
 * @brief Function for setting the analog input.
 *
 * @param[in] psel              COMP analog pin selection.
 */
void nrf_drv_comp_pin_select(nrf_comp_input_t psel);

/**
 * @brief Function for starting the COMP peripheral and interrupts.
 *
 * Before calling this function, the driver must be initialized. This function
 * enables the COMP peripheral and its interrupts.
 *
 * @param[in] comp_evt_en_mask            Mask of events to be enabled. This parameter should be built as
 *                                        'or' of elements from @ref nrf_drv_comp_evt_en_mask_t.
 * @param[in] comp_shorts_mask            Mask of shorts to be enabled. This parameter should be built as
 *                                        'or' of elements from @ref nrf_drv_comp_short_mask_t.
 *
 * @sa nrf_drv_comp_init()
 *
 */
void nrf_drv_comp_start(uint32_t comp_evt_en_mask, uint32_t comp_shorts_mask);

/**@brief Function for stopping the COMP peripheral.
 *
 * Before calling this function, the driver must be enabled. This function disables the COMP
 * peripheral and its interrupts.
 *
 * @sa nrf_drv_comp_uninit()
 *
 */
void nrf_drv_comp_stop(void);

/**
 * @brief Function for copying the current state of the comparator result to the RESULT register.
 *
 * @retval 0 If the input voltage is below the threshold (VIN+ < VIN-).
 * @retval 1 If the input voltage is above the threshold (VIN+ > VIN-).
 */
uint32_t nrf_drv_comp_sample(void);

/**
 * @brief Function for getting the task address.
 *
 * Before calling this function, the driver must be enabled.
 *
 * @param[in] comp_task                    COMP task.
 *
 * @return Address of the given COMP task.
 */
__STATIC_INLINE uint32_t nrf_drv_comp_task_address_get(nrf_comp_task_t comp_task)
{
    return (uint32_t)nrf_comp_task_address_get(comp_task);
}

/**
 * @brief Function for getting the event address.
 *
 * @param[in] comp_event                COMP event.
 *
 * @return Address of the given COMP event.
 */
__STATIC_INLINE uint32_t nrf_drv_comp_event_address_get(nrf_comp_event_t comp_event)
{
    return (uint32_t)nrf_comp_event_address_get(comp_event);
}

/**
 *@}
 **/


#ifdef __cplusplus
}
#endif
#endif /* NRF_DRV_COMP_H__ */
