/***************************************************************************//**
 * @file
 * @brief Analog Comparator (ACMP) peripheral API for EFM32.
 * @author Energy Micro AS
 * @version 1.3.0
 *******************************************************************************
 * @section License
 * <b>(C) Copyright 2010 Energy Micro AS, http://www.energymicro.com</b>
 *******************************************************************************
 *
 * This source code is the property of Energy Micro AS. The source and compiled
 * code may only be used on Energy Micro "EFM32" microcontrollers.
 *
 * This copyright notice may not be removed from the source code nor changed.
 *
 * DISCLAIMER OF WARRANTY/LIMITATION OF REMEDIES: Energy Micro AS has no
 * obligation to support this Software. Energy Micro AS is providing the
 * Software "AS IS", with no express or implied warranties of any kind,
 * including, but not limited to, any implied warranties of merchantability
 * or fitness for any particular purpose or warranties against infringement
 * of any proprietary rights of a third party.
 *
 * Energy Micro AS will not be liable for any consequential, incidental, or
 * special damages, or any other relief, or for any claim by any third party,
 * arising from your use of this Software.
 *
 ******************************************************************************/
#ifndef __EFM32_ACMP_H
#define __EFM32_ACMP_H

#include <stdint.h>
#include <stdbool.h>
#include "efm32.h"

#ifdef __cplusplus
extern "C" {
#endif

/***************************************************************************//**
 * @addtogroup EFM32_Library
 * @{
 ******************************************************************************/

/***************************************************************************//**
 * @addtogroup ACMP
 * @{
 ******************************************************************************/

/*******************************************************************************
 ********************************   ENUMS   ************************************
 ******************************************************************************/

/** Resistor values used for capacative sense. See the datasheet for your
 *  device for details on each resistor value. */
typedef enum
{
  /** resistor value 0 */
  acmpResistor0 = _ACMP_INPUTSEL_CSRESSEL_RES0,
  /** resistor value 1 */
  acmpResistor1 = _ACMP_INPUTSEL_CSRESSEL_RES1,
  /** resistor value 2 */
  acmpResistor2 = _ACMP_INPUTSEL_CSRESSEL_RES2,
  /** resistor value 3 */
  acmpResistor3 = _ACMP_INPUTSEL_CSRESSEL_RES3
} ACMP_CapsenseResistor_TypeDef;

/** Hysteresis level. See datasheet for your device for details on each
 *  level. */
typedef enum
{
  acmpHysteresisLevel0 = _ACMP_CTRL_HYSTSEL_HYST0, /**< Hysteresis level 0 */
  acmpHysteresisLevel1 = _ACMP_CTRL_HYSTSEL_HYST1, /**< Hysteresis level 1 */
  acmpHysteresisLevel2 = _ACMP_CTRL_HYSTSEL_HYST2, /**< Hysteresis level 2 */
  acmpHysteresisLevel3 = _ACMP_CTRL_HYSTSEL_HYST3, /**< Hysteresis level 3 */
  acmpHysteresisLevel4 = _ACMP_CTRL_HYSTSEL_HYST4, /**< Hysteresis level 4 */
  acmpHysteresisLevel5 = _ACMP_CTRL_HYSTSEL_HYST5, /**< Hysteresis level 5 */
  acmpHysteresisLevel6 = _ACMP_CTRL_HYSTSEL_HYST6, /**< Hysteresis level 6 */
  acmpHysteresisLevel7 = _ACMP_CTRL_HYSTSEL_HYST7  /**< Hysteresis level 7 */
} ACMP_HysteresisLevel_TypeDef;

/** ACMP warmup time. The delay is measured in HFPERCLK cycles and should
 *  be at least 10 us. */
typedef enum
{
  /** 4 HFPERCLK cycles warmup */
  acmpWarmTime4   = _ACMP_CTRL_WARMTIME_4CYCLES,
  /** 8 HFPERCLK cycles warmup */
  acmpWarmTime8   = _ACMP_CTRL_WARMTIME_8CYCLES,
  /** 16 HFPERCLK cycles warmup */
  acmpWarmTime16  = _ACMP_CTRL_WARMTIME_16CYCLES,
  /** 32 HFPERCLK cycles warmup */
  acmpWarmTime32  = _ACMP_CTRL_WARMTIME_32CYCLES,
  /** 64 HFPERCLK cycles warmup */
  acmpWarmTime64  = _ACMP_CTRL_WARMTIME_64CYCLES,
  /** 128 HFPERCLK cycles warmup */
  acmpWarmTime128 = _ACMP_CTRL_WARMTIME_128CYCLES,
  /** 256 HFPERCLK cycles warmup */
  acmpWarmTime256 = _ACMP_CTRL_WARMTIME_256CYCLES,
  /** 512 HFPERCLK cycles warmup */
  acmpWarmTime512 = _ACMP_CTRL_WARMTIME_512CYCLES
} ACMP_WarmTime_TypeDef;

/** ACMP inputs. Note that scaled VDD and bandgap references can only be used
 *  as negative inputs. */
typedef enum
{
  /** Channel 0 */
  acmpChannel0    = _ACMP_INPUTSEL_NEGSEL_CH0,
  /** Channel 1 */
  acmpChannel1    = _ACMP_INPUTSEL_NEGSEL_CH1,
  /** Channel 2 */
  acmpChannel2    = _ACMP_INPUTSEL_NEGSEL_CH2,
  /** Channel 3 */
  acmpChannel3    = _ACMP_INPUTSEL_NEGSEL_CH3,
  /** Channel 4 */
  acmpChannel4    = _ACMP_INPUTSEL_NEGSEL_CH4,
  /** Channel 5 */
  acmpChannel5    = _ACMP_INPUTSEL_NEGSEL_CH5,
  /** Channel 6 */
  acmpChannel6    = _ACMP_INPUTSEL_NEGSEL_CH6,
  /** Channel 7 */
  acmpChannel7    = _ACMP_INPUTSEL_NEGSEL_CH7,
  /** 1.25V internal reference */
  acmpChannel1V25 = _ACMP_INPUTSEL_NEGSEL_1V25,
  /** 2.5V internal reference */
  acmpChannel2V5  = _ACMP_INPUTSEL_NEGSEL_2V5,
  /** Scaled VDD reference */
  acmpChannelVDD  = _ACMP_INPUTSEL_NEGSEL_VDD
} ACMP_Channel_TypeDef;

/*******************************************************************************
 ******************************   STRUCTS   ************************************
 ******************************************************************************/

/** Capsense initialization structure. */
typedef struct
{
  /** Full bias current. See section 23.3.2 in the reference manual
   *  for details. */
  bool fullBias;

  /** Half bias current. See section 23.3.2 in the reference manual
   *  for details. */
  bool halfBias;

  /** Bias current. See section 23.3.2 in the reference manual for
   *  details. Valid values are in the range 0-7. */
  uint32_t biasProg;

  /** Warmup time. This is measured in HFPERCLK cycles and should be
   *  about 10us in wall clock time. */
  ACMP_WarmTime_TypeDef        warmTime;

  /** Hysteresis level */
  ACMP_HysteresisLevel_TypeDef hysteresisLevel;

  /** Resistor used in the capacative sensing circuit. For values see
   *  your device datasheet. */
  ACMP_CapsenseResistor_TypeDef resistor;

  /** Low power reference enabled. This setting, if enabled, reduces the
   *  power used by the VDD and bandgap references. */
  bool lowPowerReferenceEnabled;

  /** Vdd reference value. VDD_SCALED = VDD × VDDLEVEL × 50mV/3.8V.
   *  Valid values are in the range 0-63. */
  uint32_t vddLevel;
} ACMP_CapsenseInit_TypeDef;

/** Default config for capacitive sense on the STK */
#define ACMP_CAPSENSE_STK_DEFAULT                         \
  { false,              /* fullBias */                    \
    false,              /* halfBias */                    \
    0xF,                /* biasProg */                    \
    acmpWarmTime512,    /* 512 cycle warmup to be safe */ \
    acmpHysteresisLevel5,                                 \
    acmpResistor3,                                        \
    false,              /* low power reference */         \
    0x3D                /* VDD level */                   \
  }

/** ACMP initialization structure. */
typedef struct
{
  /** Full bias current. See section 23.3.2 in the reference manual
   *  for details. */
  bool fullBias;

  /** Half bias current. See section 23.3.2 in the reference manual
   *  for details. */
  bool halfBias;

  /** Bias current. See section 23.3.2 in the reference manual for
   *  details. Valid values are in the range 0-7. */
  uint32_t biasProg;

  /** Enable setting the interrupt flag on falling edge */
  bool     interruptOnFallingEdge;

  /** Enable setting the interrupt flag on rising edge */
  bool     interruptOnRisingEdge;

  /** Warmup time. This is measured in HFPERCLK cycles and should be
   *  about 10us in wall clock time. */
  ACMP_WarmTime_TypeDef        warmTime;

  /** Hysteresis level */
  ACMP_HysteresisLevel_TypeDef hysteresisLevel;

  /** Inactive value emitted by the ACMP during warmup */
  bool                         inactiveValue;

  /** Low power reference enabled. This setting, if enabled, reduces the
   *  power used by the VDD and bandgap references. */
  bool lowPowerReferenceEnabled;

  /** Vdd reference value. VDD_SCALED = VDD × VDDLEVEL × 50mV/3.8V.
   *  Valid values are in the range 0-63. */
  uint32_t vddLevel;
} ACMP_Init_TypeDef;

/*******************************************************************************
 *****************************   PROTOTYPES   **********************************
 ******************************************************************************/

void ACMP_CapsenseInit(ACMP_TypeDef *acmp, const ACMP_CapsenseInit_TypeDef *init);
void ACMP_CapsenseChannelSet(ACMP_TypeDef *acmp, ACMP_Channel_TypeDef channel);
void ACMP_ChannelSet(ACMP_TypeDef *acmp, ACMP_Channel_TypeDef negSel, ACMP_Channel_TypeDef posSel);
void ACMP_Disable(ACMP_TypeDef *acmp);
void ACMP_DisableNoReset(ACMP_TypeDef *acmp);
void ACMP_Enable(ACMP_TypeDef *acmp);
void ACMP_GPIOSetup(ACMP_TypeDef *acmp, uint32_t location, bool enable, bool invert);
void ACMP_Init(ACMP_TypeDef *acmp, const ACMP_Init_TypeDef *init);
void ACMP_Reset(ACMP_TypeDef *acmp);

/***************************************************************************//**
 * @brief
 *   Clear one or more pending ACMP interrupts.
 *
 * @param[in] acmp
 *   Pointer to ACMP peripheral register block.
 *
 * @param[in] flags
 *   Pending ACMP interrupt source to clear. Use a logical OR combination
 *   of valid interrupt flags for the ACMP module (ACMP_IF_nnn).
 ******************************************************************************/
static __INLINE void ACMP_IntClear(ACMP_TypeDef *acmp, uint32_t flags)
{
  acmp->IFC = flags;
}


/***************************************************************************//**
 * @brief
 *   Disable one or more ACMP interrupts.
 *
 * @param[in] acmp
 *   Pointer to ACMP peripheral register block.
 *
 * @param[in] flags
 *   ACMP interrupt sources to disable. Use a logical OR combination of
 *   valid interrupt flags for the ACMP module (ACMP_IF_nnn).
 ******************************************************************************/
static __INLINE void ACMP_IntDisable(ACMP_TypeDef *acmp, uint32_t flags)
{
  acmp->IEN &= ~(flags);
}


/***************************************************************************//**
 * @brief
 *   Enable one or more ACMP interrupts.
 *
 * @note
 *   Depending on the use, a pending interrupt may already be set prior to
 *   enabling the interrupt. Consider using ACMP_IntClear() prior to enabling
 *   if such a pending interrupt should be ignored.
 *
 * @param[in] acmp
 *   Pointer to ACMP peripheral register block.
 *
 * @param[in] flags
 *   ACMP interrupt sources to enable. Use a logical OR combination of
 *   valid interrupt flags for the ACMP module (ACMP_IF_nnn).
 ******************************************************************************/
static __INLINE void ACMP_IntEnable(ACMP_TypeDef *acmp, uint32_t flags)
{
  acmp->IEN |= flags;
}


/***************************************************************************//**
 * @brief
 *   Get pending ACMP interrupt flags.
 *
 * @note
 *   The event bits are not cleared by the use of this function.
 *
 * @param[in] acmp
 *   Pointer to ACMP peripheral register block.
 *
 * @return
 *   ACMP interrupt sources pending. A logical OR combination of valid
 *   interrupt flags for the ACMP module (ACMP_IF_nnn).
 ******************************************************************************/
static __INLINE uint32_t ACMP_IntGet(ACMP_TypeDef *acmp)
{
  return(acmp->IF);
}


/***************************************************************************//**
 * @brief
 *   Set one or more pending ACMP interrupts from SW.
 *
 * @param[in] acmp
 *   Pointer to ACMP peripheral register block.
 *
 * @param[in] flags
 *   ACMP interrupt sources to set to pending. Use a logical OR combination
 *   of valid interrupt flags for the ACMP module (ACMP_IF_nnn).
 ******************************************************************************/
static __INLINE void ACMP_IntSet(ACMP_TypeDef *acmp, uint32_t flags)
{
  acmp->IFS = flags;
}

/** @} (end addtogroup ACMP) */
/** @} (end addtogroup EFM32_Library) */

#ifdef __cplusplus
}
#endif

#endif /* __EFM32_ACMP_H */