/*
 * Copyright (c) 2015 - 2020, 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 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 the copyright holder nor the names of its
 *    contributors may be used to endorse or promote products derived from this
 *    software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef NRF_COMP_H_
#define NRF_COMP_H_

#include <nrfx.h>

#ifdef __cplusplus
extern "C" {
#endif

/**
 * @defgroup nrf_comp_hal COMP HAL
 * @{
 * @ingroup nrf_comp
 * @brief   Hardware access layer (HAL) for managing the Comparator (COMP) peripheral.
 */

/** @brief COMP analog pin selection. */
typedef enum
{
    NRF_COMP_INPUT_0   = COMP_PSEL_PSEL_AnalogInput0, /*!< AIN0 selected as analog input. */
    NRF_COMP_INPUT_1   = COMP_PSEL_PSEL_AnalogInput1, /*!< AIN1 selected as analog input. */
    NRF_COMP_INPUT_2   = COMP_PSEL_PSEL_AnalogInput2, /*!< AIN2 selected as analog input. */
    NRF_COMP_INPUT_3   = COMP_PSEL_PSEL_AnalogInput3, /*!< AIN3 selected as analog input. */
#if defined (COMP_PSEL_PSEL_AnalogInput4) || defined (__NRFX_DOXYGEN__)
    NRF_COMP_INPUT_4   = COMP_PSEL_PSEL_AnalogInput4, /*!< AIN4 selected as analog input. */
#endif
#if defined (COMP_PSEL_PSEL_AnalogInput5) || defined (__NRFX_DOXYGEN__)
    NRF_COMP_INPUT_5   = COMP_PSEL_PSEL_AnalogInput5, /*!< AIN5 selected as analog input. */
#endif
#if defined (COMP_PSEL_PSEL_AnalogInput6) || defined (__NRFX_DOXYGEN__)
    NRF_COMP_INPUT_6   = COMP_PSEL_PSEL_AnalogInput6, /*!< AIN6 selected as analog input. */
#endif
#if defined (COMP_PSEL_PSEL_AnalogInput7) || defined (__NRFX_DOXYGEN__)
    NRF_COMP_INPUT_7   = COMP_PSEL_PSEL_AnalogInput7, /*!< AIN7 selected as analog input. */
#endif
#if defined (COMP_PSEL_PSEL_VddDiv2) || defined (__NRFX_DOXYGEN__)
    NRF_COMP_VDD_DIV2  = COMP_PSEL_PSEL_VddDiv2,      /*!< VDD/2 selected as analog input. */
#endif
#if defined (COMP_PSEL_PSEL_VddhDiv5) || defined (__NRFX_DOXYGEN__)
    NRF_COMP_VDDH_DIV5 = COMP_PSEL_PSEL_VddhDiv5,     /*!< VDDH/5 selected as analog input. */
#endif
} nrf_comp_input_t;

/** @brief COMP reference selection. */
typedef enum
{
    NRF_COMP_REF_Int1V2 = COMP_REFSEL_REFSEL_Int1V2, /*!< VREF = internal 1.2 V reference (VDD >= 1.7 V). */
    NRF_COMP_REF_Int1V8 = COMP_REFSEL_REFSEL_Int1V8, /*!< VREF = internal 1.8 V reference (VDD >= VREF + 0.2 V). */
    NRF_COMP_REF_Int2V4 = COMP_REFSEL_REFSEL_Int2V4, /*!< VREF = internal 2.4 V reference (VDD >= VREF + 0.2 V). */
    NRF_COMP_REF_VDD = COMP_REFSEL_REFSEL_VDD,       /*!< VREF = VDD. */
    NRF_COMP_REF_ARef = COMP_REFSEL_REFSEL_ARef      /*!< VREF = AREF (VDD >= VREF >= AREFMIN). */
} nrf_comp_ref_t;

/** @brief COMP external analog reference selection. */
typedef enum
{
    NRF_COMP_EXT_REF_0 = COMP_EXTREFSEL_EXTREFSEL_AnalogReference0, /*!< Use AIN0 as external analog reference. */
    NRF_COMP_EXT_REF_1 = COMP_EXTREFSEL_EXTREFSEL_AnalogReference1, /*!< Use AIN1 as external analog reference. */
    NRF_COMP_EXT_REF_2 = COMP_EXTREFSEL_EXTREFSEL_AnalogReference2, /*!< Use AIN2 as external analog reference. */
    NRF_COMP_EXT_REF_3 = COMP_EXTREFSEL_EXTREFSEL_AnalogReference3, /*!< Use AIN3 as external analog reference. */
#if defined (COMP_EXTREFSEL_EXTREFSEL_AnalogReference4) || defined (__NRFX_DOXYGEN__)
    NRF_COMP_EXT_REF_4 = COMP_EXTREFSEL_EXTREFSEL_AnalogReference4, /*!< Use AIN4 as external analog reference. */
#endif
#if defined (COMP_EXTREFSEL_EXTREFSEL_AnalogReference5) || defined (__NRFX_DOXYGEN__)
    NRF_COMP_EXT_REF_5 = COMP_EXTREFSEL_EXTREFSEL_AnalogReference5, /*!< Use AIN5 as external analog reference. */
#endif
#if defined (COMP_EXTREFSEL_EXTREFSEL_AnalogReference6) || defined (__NRFX_DOXYGEN__)
    NRF_COMP_EXT_REF_6 = COMP_EXTREFSEL_EXTREFSEL_AnalogReference6, /*!< Use AIN6 as external analog reference. */
#endif
#if defined (COMP_EXTREFSEL_EXTREFSEL_AnalogReference7) || defined (__NRFX_DOXYGEN__)
    NRF_COMP_EXT_REF_7 = COMP_EXTREFSEL_EXTREFSEL_AnalogReference7  /*!< Use AIN7 as external analog reference. */
#endif
} nrf_comp_ext_ref_t;

/** @brief COMP THDOWN and THUP values that are used to calculate the threshold voltages VDOWN and VUP. */
typedef struct
{
    uint8_t th_down; /*!< THDOWN value. */
    uint8_t th_up;   /*!< THUP value. */
} nrf_comp_th_t;

/** @brief COMP main operation mode. */
typedef enum
{
    NRF_COMP_MAIN_MODE_SE = COMP_MODE_MAIN_SE,    /*!< Single-ended mode. */
    NRF_COMP_MAIN_MODE_Diff = COMP_MODE_MAIN_Diff /*!< Differential mode. */
} nrf_comp_main_mode_t;

/** @brief COMP speed and power mode. */
typedef enum
{
    NRF_COMP_SP_MODE_Low = COMP_MODE_SP_Low,       /*!< Low power mode. */
    NRF_COMP_SP_MODE_Normal = COMP_MODE_SP_Normal, /*!< Normal mode. */
    NRF_COMP_SP_MODE_High = COMP_MODE_SP_High      /*!< High-speed mode. */
} nrf_comp_sp_mode_t;

/** @brief COMP comparator hysteresis. */
typedef enum
{
    NRF_COMP_HYST_NoHyst = COMP_HYST_HYST_NoHyst, /*!< Comparator hysteresis disabled. */
    NRF_COMP_HYST_50mV = COMP_HYST_HYST_Hyst50mV  /*!< Comparator hysteresis enabled. */
} nrf_comp_hyst_t;

#if defined (COMP_ISOURCE_ISOURCE_Msk) || defined (__NRFX_DOXYGEN__)
/** @brief COMP current source selection on analog input. */
typedef enum
{
    NRF_COMP_ISOURCE_Off = COMP_ISOURCE_ISOURCE_Off,         /*!< Current source disabled. */
    NRF_COMP_ISOURCE_Ien2uA5 = COMP_ISOURCE_ISOURCE_Ien2mA5, /*!< Current source enabled (+/- 2.5 uA). */
    NRF_COMP_ISOURCE_Ien5uA = COMP_ISOURCE_ISOURCE_Ien5mA,   /*!< Current source enabled (+/- 5 uA). */
    NRF_COMP_ISOURCE_Ien10uA = COMP_ISOURCE_ISOURCE_Ien10mA  /*!< Current source enabled (+/- 10 uA). */
} nrf_isource_t;
#endif

/** @brief COMP tasks. */
typedef enum
{
    NRF_COMP_TASK_START  = offsetof(NRF_COMP_Type, TASKS_START), /*!< COMP start sampling task. */
    NRF_COMP_TASK_STOP   = offsetof(NRF_COMP_Type, TASKS_STOP),  /*!< COMP stop sampling task. */
    NRF_COMP_TASK_SAMPLE = offsetof(NRF_COMP_Type, TASKS_SAMPLE) /*!< Sample comparator value. */
} nrf_comp_task_t;

/** @brief COMP events. */
typedef enum
{
    NRF_COMP_EVENT_READY = offsetof(NRF_COMP_Type, EVENTS_READY), /*!< COMP is ready and output is valid. */
    NRF_COMP_EVENT_DOWN  = offsetof(NRF_COMP_Type, EVENTS_DOWN),  /*!< Input voltage crossed the threshold going down. */
    NRF_COMP_EVENT_UP    = offsetof(NRF_COMP_Type, EVENTS_UP),    /*!< Input voltage crossed the threshold going up. */
    NRF_COMP_EVENT_CROSS = offsetof(NRF_COMP_Type, EVENTS_CROSS)  /*!< Input voltage crossed the threshold in any direction. */
} nrf_comp_event_t;

/** @brief COMP reference configuration. */
typedef struct
{
    nrf_comp_ref_t     reference; /*!< COMP reference selection. */
    nrf_comp_ext_ref_t external;  /*!< COMP external analog reference selection. */
} nrf_comp_ref_conf_t;


/**
 * @brief Function for enabling the COMP peripheral.
 *
 * @param[in] p_reg Pointer to the structure of registers of the peripheral.
 */
NRF_STATIC_INLINE void nrf_comp_enable(NRF_COMP_Type * p_reg);

/**
 * @brief Function for disabling the COMP peripheral.
 *
 * @param[in] p_reg Pointer to the structure of registers of the peripheral.
 */
NRF_STATIC_INLINE void nrf_comp_disable(NRF_COMP_Type * p_reg);

/**
 * @brief Function for checking if the COMP peripheral is enabled.
 *
 * @param[in] p_reg Pointer to the structure of registers of the peripheral.
 *
 * @retval true  The COMP peripheral is enabled.
 * @retval false The COMP peripheral is not enabled.
 */
NRF_STATIC_INLINE bool nrf_comp_enable_check(NRF_COMP_Type const * p_reg);

/**
 * @brief Function for setting the reference source.
 *
 * @param[in] p_reg     Pointer to the structure of registers of the peripheral.
 * @param[in] reference COMP reference selection.
 */
NRF_STATIC_INLINE void nrf_comp_ref_set(NRF_COMP_Type * p_reg, nrf_comp_ref_t reference);

/**
 * @brief Function for setting the external analog reference source.
 *
 * @param[in] p_reg   Pointer to the structure of registers of the peripheral.
 * @param[in] ext_ref COMP external analog reference selection.
 */
NRF_STATIC_INLINE void nrf_comp_ext_ref_set(NRF_COMP_Type * p_reg, nrf_comp_ext_ref_t ext_ref);

/**
 * @brief Function for setting threshold voltages.
 *
 * @param[in] p_reg     Pointer to the structure of registers of the peripheral.
 * @param[in] threshold COMP VDOWN and VUP thresholds.
 */
NRF_STATIC_INLINE void nrf_comp_th_set(NRF_COMP_Type * p_reg, nrf_comp_th_t threshold);

/**
 * @brief Function for setting the main mode.
 *
 * @param[in] p_reg     Pointer to the structure of registers of the peripheral.
 * @param[in] main_mode COMP main operation mode.
 */
NRF_STATIC_INLINE void nrf_comp_main_mode_set(NRF_COMP_Type *      p_reg,
                                              nrf_comp_main_mode_t main_mode);

/**
 * @brief Function for setting the speed mode.
 *
 * @param[in] p_reg      Pointer to the structure of registers of the peripheral.
 * @param[in] speed_mode COMP speed and power mode.
 */
NRF_STATIC_INLINE void nrf_comp_speed_mode_set(NRF_COMP_Type *    p_reg,
                                               nrf_comp_sp_mode_t speed_mode);

/**
 * @brief Function for setting the hysteresis.
 *
 * @param[in] p_reg Pointer to the structure of registers of the peripheral.
 * @param[in] hyst  COMP comparator hysteresis.
 */
NRF_STATIC_INLINE void nrf_comp_hysteresis_set(NRF_COMP_Type * p_reg, nrf_comp_hyst_t hyst);

#if defined (COMP_ISOURCE_ISOURCE_Msk) || defined (__NRFX_DOXYGEN__)
/**
 * @brief Function for setting the current source on the analog input.
 *
 * @param[in] p_reg   Pointer to the structure of registers of the peripheral.
 * @param[in] isource COMP current source selection on analog input.
 */
NRF_STATIC_INLINE void nrf_comp_isource_set(NRF_COMP_Type * p_reg, nrf_isource_t isource);
#endif

/**
 * @brief Function for selecting the active input of the COMP.
 *
 * @param[in] p_reg Pointer to the structure of registers of the peripheral.
 * @param[in] input Input to be selected.
 */
NRF_STATIC_INLINE void nrf_comp_input_select(NRF_COMP_Type * p_reg, nrf_comp_input_t input);

/**
 * @brief Function for getting the last COMP compare result.
 *
 * @note If VIN+ == VIN-, the return value depends on the previous result.
 *
 * @param[in] p_reg Pointer to the structure of registers of the peripheral.
 *
 * @return The last compare result. If 0, then VIN+ < VIN-. If 1, then VIN+ > VIN-.
 */
NRF_STATIC_INLINE uint32_t nrf_comp_result_get(NRF_COMP_Type const * p_reg);

/**
 * @brief Function for enabling interrupts from COMP.
 *
 * @param[in] p_reg Pointer to the structure of registers of the peripheral.
 * @param[in] mask  Mask of interrupts to be enabled.
 *
 * @sa nrf_comp_int_enable_check
 */
NRF_STATIC_INLINE void nrf_comp_int_enable(NRF_COMP_Type * p_reg, uint32_t mask);

/**
 * @brief Function for disabling interrupts from COMP.
 *
 * @param[in] p_reg Pointer to the structure of registers of the peripheral.
 * @param[in] mask  Mask of interrupts to be disabled.
 *
 * @sa nrf_comp_int_enable_check
 */
NRF_STATIC_INLINE void nrf_comp_int_disable(NRF_COMP_Type * p_reg, uint32_t mask);

/**
 * @brief Function for checking if the specified interrupts are enabled.
 *
 * @param[in] p_reg Pointer to the structure of registers of the peripheral.
 * @param[in] mask  Mask of interrupts to be checked.
 *
 * @return Mask of enabled interrupts.
 */
NRF_STATIC_INLINE uint32_t nrf_comp_int_enable_check(NRF_COMP_Type const * p_reg, uint32_t mask);

/**
 * @brief Function for getting the address of the specified COMP task register.
 *
 * @param[in] p_reg Pointer to the structure of registers of the peripheral.
 * @param[in] task  COMP task.
 *
 * @return Address of the specified COMP task.
 */
NRF_STATIC_INLINE uint32_t nrf_comp_task_address_get(NRF_COMP_Type const * p_reg,
                                                     nrf_comp_task_t       task);

/**
 * @brief Function for getting the address of the specified COMP event register.
 *
 * @param[in] p_reg Pointer to the structure of registers of the peripheral.
 * @param[in] event COMP event.
 *
 * @return Address of the specified COMP event.
 */
NRF_STATIC_INLINE uint32_t nrf_comp_event_address_get(NRF_COMP_Type const * p_reg,
                                                      nrf_comp_event_t      event);

/**
 * @brief  Function for setting COMP shortcuts.
 *
 * @param[in] p_reg Pointer to the structure of registers of the peripheral.
 * @param[in] mask  Mask of shortcuts.
 */
NRF_STATIC_INLINE void nrf_comp_shorts_enable(NRF_COMP_Type * p_reg, uint32_t mask);

/**
 * @brief Function for clearing COMP shortcuts by mask.
 *
 * @param[in] p_reg Pointer to the structure of registers of the peripheral.
 * @param[in] mask  Mask of shortcuts.
 */
NRF_STATIC_INLINE void nrf_comp_shorts_disable(NRF_COMP_Type * p_reg, uint32_t mask);

/**
 * @brief Function for setting the specified COMP task.
 *
 * @param[in] p_reg Pointer to the structure of registers of the peripheral.
 * @param[in] task  Task to be activated.
 */
NRF_STATIC_INLINE void nrf_comp_task_trigger(NRF_COMP_Type * p_reg, nrf_comp_task_t task);

/**
 * @brief Function for clearing the specified COMP event.
 *
 * @param[in] p_reg Pointer to the structure of registers of the peripheral.
 * @param[in] event COMP event to be cleared.
 */
NRF_STATIC_INLINE void nrf_comp_event_clear(NRF_COMP_Type * p_reg, nrf_comp_event_t event);

/**
 * @brief Function for retrieving the state of the UARTE event.
 *
 * @param[in] p_reg Pointer to the structure of registers of the peripheral.
 * @param[in] event Event to be checked.
 *
 * @retval true  The event has been generated.
 * @retval false The event has not been generated.
 */
NRF_STATIC_INLINE bool nrf_comp_event_check(NRF_COMP_Type const * p_reg, nrf_comp_event_t event);


#ifndef NRF_DECLARE_ONLY

NRF_STATIC_INLINE void nrf_comp_enable(NRF_COMP_Type * p_reg)
{
    p_reg->ENABLE = (COMP_ENABLE_ENABLE_Enabled << COMP_ENABLE_ENABLE_Pos);
}

NRF_STATIC_INLINE void nrf_comp_disable(NRF_COMP_Type * p_reg)
{
    p_reg->ENABLE = (COMP_ENABLE_ENABLE_Disabled << COMP_ENABLE_ENABLE_Pos);
}

NRF_STATIC_INLINE bool nrf_comp_enable_check(NRF_COMP_Type const * p_reg)
{
    return ((p_reg->ENABLE) & COMP_ENABLE_ENABLE_Enabled);
}

NRF_STATIC_INLINE void nrf_comp_ref_set(NRF_COMP_Type * p_reg, nrf_comp_ref_t reference)
{
    p_reg->REFSEL = (reference << COMP_REFSEL_REFSEL_Pos);
}

NRF_STATIC_INLINE void nrf_comp_ext_ref_set(NRF_COMP_Type * p_reg, nrf_comp_ext_ref_t ext_ref)
{
    p_reg->EXTREFSEL = (ext_ref << COMP_EXTREFSEL_EXTREFSEL_Pos);
}

NRF_STATIC_INLINE void nrf_comp_th_set(NRF_COMP_Type * p_reg, nrf_comp_th_t threshold)
{
    p_reg->TH =
        (((uint32_t)threshold.th_down << COMP_TH_THDOWN_Pos) & COMP_TH_THDOWN_Msk) |
        (((uint32_t)threshold.th_up << COMP_TH_THUP_Pos) & COMP_TH_THUP_Msk);
}

NRF_STATIC_INLINE void nrf_comp_main_mode_set(NRF_COMP_Type *      p_reg,
                                              nrf_comp_main_mode_t main_mode)
{
    p_reg->MODE |= (main_mode << COMP_MODE_MAIN_Pos);
}

NRF_STATIC_INLINE void nrf_comp_speed_mode_set(NRF_COMP_Type *    p_reg,
                                               nrf_comp_sp_mode_t speed_mode)
{
    p_reg->MODE |= (speed_mode << COMP_MODE_SP_Pos);
}

NRF_STATIC_INLINE void nrf_comp_hysteresis_set(NRF_COMP_Type * p_reg, nrf_comp_hyst_t hyst)
{
    p_reg->HYST = (hyst << COMP_HYST_HYST_Pos) & COMP_HYST_HYST_Msk;
}

#if defined (COMP_ISOURCE_ISOURCE_Msk)
NRF_STATIC_INLINE void nrf_comp_isource_set(NRF_COMP_Type * p_reg, nrf_isource_t isource)
{
    p_reg->ISOURCE = (isource << COMP_ISOURCE_ISOURCE_Pos) & COMP_ISOURCE_ISOURCE_Msk;
}
#endif

NRF_STATIC_INLINE void nrf_comp_input_select(NRF_COMP_Type * p_reg, nrf_comp_input_t input)
{
    p_reg->PSEL   = ((uint32_t)input << COMP_PSEL_PSEL_Pos);
}

NRF_STATIC_INLINE uint32_t nrf_comp_result_get(NRF_COMP_Type const * p_reg)
{
    return (uint32_t)p_reg->RESULT;
}

NRF_STATIC_INLINE void nrf_comp_int_enable(NRF_COMP_Type * p_reg, uint32_t mask)
{
    p_reg->INTENSET = mask;
}

NRF_STATIC_INLINE void nrf_comp_int_disable(NRF_COMP_Type * p_reg, uint32_t mask)
{
    p_reg->INTENCLR = mask;
}

NRF_STATIC_INLINE uint32_t nrf_comp_int_enable_check(NRF_COMP_Type const * p_reg, uint32_t mask)
{
    return p_reg->INTENSET & mask; // When read, this register returns the value of INTEN.
}

NRF_STATIC_INLINE uint32_t nrf_comp_task_address_get(NRF_COMP_Type const * p_reg,
                                                     nrf_comp_task_t       task)
{
    return (uint32_t)((uint8_t *)p_reg + (uint32_t)task);
}

NRF_STATIC_INLINE uint32_t nrf_comp_event_address_get(NRF_COMP_Type const * p_reg,
                                                      nrf_comp_event_t      event)
{
    return (uint32_t)((uint8_t *)p_reg + (uint32_t)event);
}

NRF_STATIC_INLINE void nrf_comp_shorts_enable(NRF_COMP_Type * p_reg, uint32_t mask)
{
    p_reg->SHORTS |= mask;
}

NRF_STATIC_INLINE void nrf_comp_shorts_disable(NRF_COMP_Type * p_reg, uint32_t mask)
{
    p_reg->SHORTS &= ~mask;
}

NRF_STATIC_INLINE void nrf_comp_task_trigger(NRF_COMP_Type * p_reg, nrf_comp_task_t task)
{
    *( (volatile uint32_t *)( (uint8_t *)p_reg + (uint32_t)task) ) = 1;
}

NRF_STATIC_INLINE void nrf_comp_event_clear(NRF_COMP_Type * p_reg, nrf_comp_event_t event)
{
    *( (volatile uint32_t *)( (uint8_t *)p_reg + (uint32_t)event) ) = 0;
#if __CORTEX_M == 0x04
    volatile uint32_t dummy = *((volatile uint32_t *)((uint8_t *)p_reg + (uint32_t)event));
    (void)dummy;
#endif
}

NRF_STATIC_INLINE bool nrf_comp_event_check(NRF_COMP_Type const * p_reg, nrf_comp_event_t event)
{
    return (bool) (*(volatile uint32_t *)( (uint8_t *)p_reg + (uint32_t)event));
}

#endif // NRF_DECLARE_ONLY

/** @} */

#ifdef __cplusplus
}
#endif

#endif // NRF_COMP_H_
