/* Copyright (c) 2015 Nordic Semiconductor. All Rights Reserved.
 *
 * The information contained herein is property of Nordic Semiconductor ASA.
 * Terms and conditions of usage are described in detail in NORDIC
 * SEMICONDUCTOR STANDARD SOFTWARE LICENSE AGREEMENT.
 *
 * Licensees are granted free, non-transferable use of the information. NO
 * WARRANTY of ANY KIND is provided. This heading must NOT be removed from
 * the file.
 *  
 */

/**
 * @file
 * @brief COMP HAL API.
 */

#ifndef NRF_COMP_H_
#define NRF_COMP_H_

/**
 * @defgroup nrf_comp_hal COMP HAL
 * @{
 * @ingroup nrf_comp
 * @brief @tagAPI52 Hardware access layer for managing the Comparator (COMP).
 */

#include "nrf.h"

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

/**
 * @enum nrf_comp_input_t
 * @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. */
	NRF_COMP_INPUT_4 = COMP_PSEL_PSEL_AnalogInput4,		/*!< AIN4 selected as analog input. */
	NRF_COMP_INPUT_5 = COMP_PSEL_PSEL_AnalogInput5,		/*!< AIN5 selected as analog input. */
	NRF_COMP_INPUT_6 = COMP_PSEL_PSEL_AnalogInput6,		/*!< AIN6 selected as analog input. */
	NRF_COMP_INPUT_7 = COMP_PSEL_PSEL_AnalogInput7		/*!< AIN7 selected as analog input. */
}nrf_comp_input_t;

/**
 * @enum nrf_comp_ref_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;

/**
 * @enum nrf_comp_ext_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_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;

/**
 * @enum nrf_comp_main_mode_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;

/**
 * @enum nrf_comp_sp_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;

/**
 * @enum nrf_comp_hyst_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;

/**
 * @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;

/**
 * @enum nrf_comp_task_t
 * @brief COMP tasks.
 */
typedef enum
{
    /*lint -save -e30*/
    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. */
    /*lint -restore*/
}nrf_comp_task_t;

/**
 * @enum nrf_comp_event_t
 * @brief COMP events.
 */
typedef enum
{
    /*lint -save -e30*/
    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. */
    /*lint -restore*/
}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.
 */
__STATIC_INLINE void nrf_comp_enable(void);


/**
 * @brief Function for disabling the COMP peripheral.
 */

__STATIC_INLINE void nrf_comp_disable(void);

/**
 * @brief Function for checking if the COMP peripheral is enabled.
 *
 * @retval true  If the COMP peripheral is enabled.
 * @retval false If the COMP peripheral is not enabled.
 */
__STATIC_INLINE bool nrf_comp_enable_check(void);

/**
 * @brief Function for setting the reference source.
 *
 * @param[in] reference                 COMP reference selection.
 */
__STATIC_INLINE void nrf_comp_ref_set(nrf_comp_ref_t reference);


/**
 * @brief Function for setting the external analog reference source.
 *
 * @param[in] ext_ref                   COMP external analog reference selection.
 */
__STATIC_INLINE void nrf_comp_ext_ref_set(nrf_comp_ext_ref_t ext_ref);


/**
 * @brief Function for setting threshold voltages.
 *
 * @param[in] threshold                 COMP VDOWN and VUP thresholds.
 */
__STATIC_INLINE void nrf_comp_th_set(nrf_comp_th_t threshold);


/**
 * @brief Function for setting the main mode.
 * 
 * @param[in] main_mode                 COMP main operation mode.
 */
__STATIC_INLINE void nrf_comp_main_mode_set(nrf_comp_main_mode_t main_mode);


/**
 * @brief Function for setting the speed mode.
 * 
 * @param[in] speed_mode                COMP speed and power mode.
 */
__STATIC_INLINE void nrf_comp_speed_mode_set(nrf_comp_sp_mode_t speed_mode);


/**
 * @brief Function for setting the hysteresis.
 *
 * @param[in] hyst                      COMP comparator hysteresis.
 */
__STATIC_INLINE void nrf_comp_hysteresis_set(nrf_comp_hyst_t hyst);


/**
 * @brief Function for setting the current source on the analog input.
 *
 * @param[in] isource                   COMP current source selection on analog input.
 */
__STATIC_INLINE void nrf_comp_isource_set(nrf_isource_t isource);


/**
 * @brief Function for selecting the active input of the COMP.
 *
 * @param[in] input Input to be selected.
 */
__STATIC_INLINE void nrf_comp_input_select(nrf_comp_input_t input);


/**
 * @brief Function for getting the last COMP compare result.
 *
 * @return The last compare result. If 0, then VIN+ < VIN-. If 1, then VIN+ > VIN-.
 *
 * @note If VIN+ == VIN-, the return value depends on the previous result.
 */
__STATIC_INLINE uint32_t nrf_comp_result_get(void);


/**
 * @brief Function for enabling interrupts from COMP.
 *
 * @param[in] comp_int_mask Mask of interrupts to be enabled.
 *
 * @sa nrf_comp_int_enable_check()
 */
__STATIC_INLINE void nrf_comp_int_enable(uint32_t comp_int_mask);

/**
 * @brief Function for disabling interrupts from COMP.
 *
 * @param[in] comp_int_mask Mask of interrupts to be disabled.
 *
 * @sa nrf_comp_int_enable_check()
 */
__STATIC_INLINE void nrf_comp_int_disable(uint32_t comp_int_mask);


/**
 * @brief Function for getting the enabled interrupts of COMP.
 *
 * @param[in] comp_int_mask Mask of interrupts to be checked.
 *
 * @retval true If any interrupts of the specified mask are enabled.
 */
__STATIC_INLINE bool nrf_comp_int_enable_check(uint32_t comp_int_mask);



/**
 * @brief Function for getting the address of a specific COMP task register.
 *
 * @param[in] comp_task COMP task.
 *
 * @return Address of the specified COMP task.
 */
__STATIC_INLINE uint32_t * nrf_comp_task_address_get(nrf_comp_task_t comp_task);


/**
 * @brief Function for getting the address of a specific COMP event register.
 *
 * @param[in] comp_event COMP event.
 *
 * @return Address of the specified COMP event.
 */
__STATIC_INLINE uint32_t * nrf_comp_event_address_get(nrf_comp_event_t comp_event);


/**
 * @brief  Function for setting COMP shorts.
 *
 * @param[in] comp_short_mask COMP shorts by mask.
 *
 */
__STATIC_INLINE void nrf_comp_shorts_enable(uint32_t comp_short_mask);


/**
 * @brief Function for clearing COMP shorts by mask.
 *
 * @param[in] comp_short_mask COMP shorts to be cleared.
 *
 */
__STATIC_INLINE void nrf_comp_shorts_disable(uint32_t comp_short_mask);


/**
 * @brief Function for setting a specific COMP task.
 *
 * @param[in] comp_task COMP task to be set.
 *
 */
__STATIC_INLINE void nrf_comp_task_trigger(nrf_comp_task_t comp_task);


/**
 * @brief Function for clearing a specific COMP event.
 *
 * @param[in] comp_event COMP event to be cleared.
 *
 */
__STATIC_INLINE void nrf_comp_event_clear(nrf_comp_event_t comp_event);


/**
 * @brief Function for getting the state of a specific COMP event.
 *
 * @retval true If the specified COMP event is active.
 *
 */
__STATIC_INLINE bool nrf_comp_event_check(nrf_comp_event_t comp_event);

#ifndef SUPPRESS_INLINE_IMPLEMENTATION

__STATIC_INLINE void nrf_comp_enable(void)
{
	NRF_COMP->ENABLE = (COMP_ENABLE_ENABLE_Enabled << COMP_ENABLE_ENABLE_Pos);
}

__STATIC_INLINE void nrf_comp_disable(void)
{
    NRF_COMP->ENABLE = (COMP_ENABLE_ENABLE_Disabled << COMP_ENABLE_ENABLE_Pos);
}

__STATIC_INLINE bool nrf_comp_enable_check(void)
{
	return ((NRF_COMP->ENABLE) & COMP_ENABLE_ENABLE_Enabled);
}

__STATIC_INLINE void nrf_comp_ref_set(nrf_comp_ref_t reference)
{
    NRF_COMP->REFSEL = (reference << COMP_REFSEL_REFSEL_Pos);
}

__STATIC_INLINE void nrf_comp_ext_ref_set(nrf_comp_ext_ref_t ext_ref)
{
    NRF_COMP->EXTREFSEL = (ext_ref << COMP_EXTREFSEL_EXTREFSEL_Pos);
}

__STATIC_INLINE void nrf_comp_th_set(nrf_comp_th_t threshold)
{
    NRF_COMP->TH = 
        ((threshold.th_down << COMP_TH_THDOWN_Pos) & COMP_TH_THDOWN_Msk) | 
        ((threshold.th_up << COMP_TH_THUP_Pos) & COMP_TH_THUP_Msk);
}

__STATIC_INLINE void nrf_comp_main_mode_set(nrf_comp_main_mode_t main_mode)
{
    NRF_COMP->MODE |= (main_mode << COMP_MODE_MAIN_Pos);
}

__STATIC_INLINE void nrf_comp_speed_mode_set(nrf_comp_sp_mode_t speed_mode)
{
    NRF_COMP->MODE |= (speed_mode << COMP_MODE_SP_Pos);
}

__STATIC_INLINE void nrf_comp_hysteresis_set(nrf_comp_hyst_t hyst)
{
    NRF_COMP->HYST = (hyst << COMP_HYST_HYST_Pos) & COMP_HYST_HYST_Msk;
}

__STATIC_INLINE void nrf_comp_isource_set(nrf_isource_t isource)
{
    NRF_COMP->ISOURCE = (isource << COMP_ISOURCE_ISOURCE_Pos) & COMP_ISOURCE_ISOURCE_Msk;
}

__STATIC_INLINE void nrf_comp_input_select(nrf_comp_input_t input)
{
    NRF_COMP->PSEL   = ((uint32_t)input << COMP_PSEL_PSEL_Pos);
}

__STATIC_INLINE uint32_t nrf_comp_result_get(void)
{
    return (uint32_t)NRF_COMP->RESULT;
}

__STATIC_INLINE void nrf_comp_int_enable(uint32_t comp_int_mask)
{
    NRF_COMP->INTENSET = comp_int_mask;
}

__STATIC_INLINE void nrf_comp_int_disable(uint32_t comp_int_mask)
{
    NRF_COMP->INTENCLR = comp_int_mask;
}

__STATIC_INLINE bool nrf_comp_int_enable_check(uint32_t comp_int_mask)
{
    return (NRF_COMP->INTENSET & comp_int_mask); // when read this register will return the value of INTEN.
}

__STATIC_INLINE uint32_t * nrf_comp_task_address_get(nrf_comp_task_t comp_task)
{
    return (uint32_t *)((uint8_t *)NRF_COMP + (uint32_t)comp_task);
}

__STATIC_INLINE uint32_t * nrf_comp_event_address_get(nrf_comp_event_t comp_event)
{
    return (uint32_t *)((uint8_t *)NRF_COMP + (uint32_t)comp_event);
}

__STATIC_INLINE void nrf_comp_shorts_enable(uint32_t comp_short_mask)
{
    NRF_COMP->SHORTS |= comp_short_mask;
}

__STATIC_INLINE void nrf_comp_shorts_disable(uint32_t comp_short_mask)
{
    NRF_COMP->SHORTS &= ~comp_short_mask;
}

__STATIC_INLINE void nrf_comp_task_trigger(nrf_comp_task_t comp_task)
{
    *( (volatile uint32_t *)( (uint8_t *)NRF_COMP + comp_task) ) = 1;
}

__STATIC_INLINE void nrf_comp_event_clear(nrf_comp_event_t comp_event)
{
    *( (volatile uint32_t *)( (uint8_t *)NRF_COMP + (uint32_t)comp_event) ) = 0;
}

__STATIC_INLINE bool nrf_comp_event_check(nrf_comp_event_t comp_event)
{
    return (bool) (*(volatile uint32_t *)( (uint8_t *)NRF_COMP + comp_event));
}

#endif // SUPPRESS_INLINE_IMPLEMENTATION

/**
 *@}
 **/

#endif // NRF_COMP_H_