File content as of revision 171:3a7713b1edbc:

/**
 * \file
 *
 * \brief SAM ADC functionality
 *
 * Copyright (C) 2014-2015 Atmel Corporation. All rights reserved.
 *
 * \asf_license_start
 *
 * \page License
 *
 * 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. The name of Atmel may not be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * 4. This software may only be redistributed and used in connection with an
 *    Atmel microcontroller product.
 *
 * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
 * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 * \asf_license_stop
 *
 */
/*
 * Support and FAQ: visit <a href="http://www.atmel.com/design-support/">Atmel Support</a>
 */
#ifndef ADC_FEATURE_H_INCLUDED
#define ADC_FEATURE_H_INCLUDED

/**
 * \addtogroup asfdoc_sam0_adc_group
 * @{
 */

#ifdef __cplusplus
extern "C" {
#endif

#if ADC_CALLBACK_MODE == true
#  include <system_interrupt.h>

#if !defined(__DOXYGEN__)
extern struct adc_module *_adc_instances[ADC_INST_NUM];
#endif

/** Forward definition of the device instance. */
struct adc_module;

/** Type of the callback functions. */
typedef void (*adc_callback_t)(struct adc_module *const module);

/**
 * \brief ADC Callback enum
 *
 * Callback types for ADC callback driver.
 *
 */
enum adc_callback {
    /** Callback for buffer received. */
    ADC_CALLBACK_READ_BUFFER,
    /** Callback when window is hit. */
    ADC_CALLBACK_WINDOW,
    /** Callback for error. */
    ADC_CALLBACK_ERROR,
#  if !defined(__DOXYGEN__)
    /** Number of available callbacks. */
    ADC_CALLBACK_N,
#  endif
};

#endif

/**
 * \brief ADC reference voltage enum
 *
 * Enum for the possible reference voltages for the ADC.
 *
 */
enum adc_reference {
    /** 1.0V voltage reference. */
    ADC_REFERENCE_INT1V   = ADC_REFCTRL_REFSEL_INT1V,
    /** 1/1.48V<SUB>CC</SUB> reference. */
    ADC_REFERENCE_INTVCC0 = ADC_REFCTRL_REFSEL_INTVCC0,
    /** 1/2V<SUB>CC</SUB> (only for internal V<SUB>CC</SUB> > 2.1V). */
    ADC_REFERENCE_INTVCC1 = ADC_REFCTRL_REFSEL_INTVCC1,
    /** External reference A. */
    ADC_REFERENCE_AREFA   = ADC_REFCTRL_REFSEL_AREFA,
    /** External reference B. */
    ADC_REFERENCE_AREFB   = ADC_REFCTRL_REFSEL_AREFB,
};

/**
 * \brief ADC clock prescaler enum
 *
 * Enum for the possible clock prescaler values for the ADC.
 *
 */
enum adc_clock_prescaler {
    /** ADC clock division factor 4. */
    ADC_CLOCK_PRESCALER_DIV4   = ADC_CTRLB_PRESCALER_DIV4,
    /** ADC clock division factor 8. */
    ADC_CLOCK_PRESCALER_DIV8   = ADC_CTRLB_PRESCALER_DIV8,
    /** ADC clock division factor 16. */
    ADC_CLOCK_PRESCALER_DIV16  = ADC_CTRLB_PRESCALER_DIV16,
    /** ADC clock division factor 32. */
    ADC_CLOCK_PRESCALER_DIV32  = ADC_CTRLB_PRESCALER_DIV32,
    /** ADC clock division factor 64. */
    ADC_CLOCK_PRESCALER_DIV64  = ADC_CTRLB_PRESCALER_DIV64,
    /** ADC clock division factor 128. */
    ADC_CLOCK_PRESCALER_DIV128 = ADC_CTRLB_PRESCALER_DIV128,
    /** ADC clock division factor 256. */
    ADC_CLOCK_PRESCALER_DIV256 = ADC_CTRLB_PRESCALER_DIV256,
    /** ADC clock division factor 512. */
    ADC_CLOCK_PRESCALER_DIV512 = ADC_CTRLB_PRESCALER_DIV512,
};

/**
 * \brief ADC resolution enum
 *
 * Enum for the possible resolution values for the ADC.
 *
 */
enum adc_resolution {
    /** ADC 12-bit resolution. */
    ADC_RESOLUTION_12BIT = ADC_CTRLB_RESSEL_12BIT,
    /** ADC 16-bit resolution using oversampling and decimation. */
    ADC_RESOLUTION_16BIT = ADC_CTRLB_RESSEL_16BIT,
    /** ADC 10-bit resolution. */
    ADC_RESOLUTION_10BIT = ADC_CTRLB_RESSEL_10BIT,
    /** ADC 8-bit resolution. */
    ADC_RESOLUTION_8BIT  = ADC_CTRLB_RESSEL_8BIT,
    /** ADC 13-bit resolution using oversampling and decimation. */
    ADC_RESOLUTION_13BIT,
    /** ADC 14-bit resolution using oversampling and decimation. */
    ADC_RESOLUTION_14BIT,
    /** ADC 15-bit resolution using oversampling and decimation. */
    ADC_RESOLUTION_15BIT,
    /** ADC 16-bit result register for use with averaging. When using this mode
      * the ADC result register will be set to 16-bit wide, and the number of
      * samples to accumulate and the division factor is configured by the
      * \ref adc_config.accumulate_samples and \ref adc_config.divide_result
      * members in the configuration struct.
      */
    ADC_RESOLUTION_CUSTOM,
};

/**
 * \brief ADC window monitor mode enum
 *
 * Enum for the possible window monitor modes for the ADC.
 *
 */
enum adc_window_mode {
    /** No window mode. */
    ADC_WINDOW_MODE_DISABLE          = ADC_WINCTRL_WINMODE_DISABLE,
    /** RESULT > WINLT. */
    ADC_WINDOW_MODE_ABOVE_LOWER      = ADC_WINCTRL_WINMODE_MODE1,
    /** RESULT < WINUT. */
    ADC_WINDOW_MODE_BELOW_UPPER      = ADC_WINCTRL_WINMODE_MODE2,
    /** WINLT < RESULT < WINUT. */
    ADC_WINDOW_MODE_BETWEEN          = ADC_WINCTRL_WINMODE_MODE3,
    /** !(WINLT < RESULT < WINUT). */
    ADC_WINDOW_MODE_BETWEEN_INVERTED = ADC_WINCTRL_WINMODE_MODE4,
};

/**
 * \brief ADC gain factor selection enum
 *
 * Enum for the possible gain factor values for the ADC.
 *
 */
enum adc_gain_factor {
    /** 1x gain. */
    ADC_GAIN_FACTOR_1X   = ADC_INPUTCTRL_GAIN_1X,
    /** 2x gain. */
    ADC_GAIN_FACTOR_2X   = ADC_INPUTCTRL_GAIN_2X,
    /** 4x gain. */
    ADC_GAIN_FACTOR_4X   = ADC_INPUTCTRL_GAIN_4X,
    /** 8x gain. */
    ADC_GAIN_FACTOR_8X   = ADC_INPUTCTRL_GAIN_8X,
    /** 16x gain. */
    ADC_GAIN_FACTOR_16X  = ADC_INPUTCTRL_GAIN_16X,
    /** 1/2x gain. */
    ADC_GAIN_FACTOR_DIV2 = ADC_INPUTCTRL_GAIN_DIV2,
};

/**
 * \brief ADC event action enum
 *
 * Enum for the possible actions to take on an incoming event.
 *
 */
enum adc_event_action {
    /** Event action disabled. */
    ADC_EVENT_ACTION_DISABLED         = 0,
    /** Flush ADC and start conversion. */
    ADC_EVENT_ACTION_FLUSH_START_CONV = ADC_EVCTRL_SYNCEI,
    /** Start conversion. */
    ADC_EVENT_ACTION_START_CONV       = ADC_EVCTRL_STARTEI,
};

/**
 * \brief ADC positive MUX input selection enum
 *
 * Enum for the possible positive MUX input selections for the ADC.
 *
 */
enum adc_positive_input {
    /** ADC0 pin. */
    ADC_POSITIVE_INPUT_PIN0          = ADC_INPUTCTRL_MUXPOS_PIN0,
    /** ADC1 pin. */
    ADC_POSITIVE_INPUT_PIN1          = ADC_INPUTCTRL_MUXPOS_PIN1,
    /** ADC2 pin. */
    ADC_POSITIVE_INPUT_PIN2          = ADC_INPUTCTRL_MUXPOS_PIN2,
    /** ADC3 pin. */
    ADC_POSITIVE_INPUT_PIN3          = ADC_INPUTCTRL_MUXPOS_PIN3,
    /** ADC4 pin. */
    ADC_POSITIVE_INPUT_PIN4          = ADC_INPUTCTRL_MUXPOS_PIN4,
    /** ADC5 pin. */
    ADC_POSITIVE_INPUT_PIN5          = ADC_INPUTCTRL_MUXPOS_PIN5,
    /** ADC6 pin. */
    ADC_POSITIVE_INPUT_PIN6          = ADC_INPUTCTRL_MUXPOS_PIN6,
    /** ADC7 pin. */
    ADC_POSITIVE_INPUT_PIN7          = ADC_INPUTCTRL_MUXPOS_PIN7,
    /** ADC8 pin. */
    ADC_POSITIVE_INPUT_PIN8          = ADC_INPUTCTRL_MUXPOS_PIN8,
    /** ADC9 pin. */
    ADC_POSITIVE_INPUT_PIN9          = ADC_INPUTCTRL_MUXPOS_PIN9,
    /** ADC10 pin. */
    ADC_POSITIVE_INPUT_PIN10         = ADC_INPUTCTRL_MUXPOS_PIN10,
    /** ADC11 pin. */
    ADC_POSITIVE_INPUT_PIN11         = ADC_INPUTCTRL_MUXPOS_PIN11,
    /** ADC12 pin. */
    ADC_POSITIVE_INPUT_PIN12         = ADC_INPUTCTRL_MUXPOS_PIN12,
    /** ADC13 pin. */
    ADC_POSITIVE_INPUT_PIN13         = ADC_INPUTCTRL_MUXPOS_PIN13,
    /** ADC14 pin. */
    ADC_POSITIVE_INPUT_PIN14         = ADC_INPUTCTRL_MUXPOS_PIN14,
    /** ADC15 pin. */
    ADC_POSITIVE_INPUT_PIN15         = ADC_INPUTCTRL_MUXPOS_PIN15,
    /** ADC16 pin. */
    ADC_POSITIVE_INPUT_PIN16         = ADC_INPUTCTRL_MUXPOS_PIN16,
    /** ADC17 pin. */
    ADC_POSITIVE_INPUT_PIN17         = ADC_INPUTCTRL_MUXPOS_PIN17,
    /** ADC18 pin. */
    ADC_POSITIVE_INPUT_PIN18         = ADC_INPUTCTRL_MUXPOS_PIN18,
    /** ADC19 pin. */
    ADC_POSITIVE_INPUT_PIN19         = ADC_INPUTCTRL_MUXPOS_PIN19,
    /** Temperature reference. */
    ADC_POSITIVE_INPUT_TEMP          = ADC_INPUTCTRL_MUXPOS_TEMP,
    /** Bandgap voltage. */
    ADC_POSITIVE_INPUT_BANDGAP       = ADC_INPUTCTRL_MUXPOS_BANDGAP,
    /** 1/4 scaled core supply. */
    ADC_POSITIVE_INPUT_SCALEDCOREVCC = ADC_INPUTCTRL_MUXPOS_SCALEDCOREVCC,
    /** 1/4 scaled I/O supply. */
    ADC_POSITIVE_INPUT_SCALEDIOVCC   = ADC_INPUTCTRL_MUXPOS_SCALEDIOVCC,
    /** DAC input. */
    ADC_POSITIVE_INPUT_DAC           = ADC_INPUTCTRL_MUXPOS_DAC,
};

/**
 * \brief ADC negative MUX input selection enum
 *
 * Enum for the possible negative MUX input selections for the ADC.
 *
 */
enum adc_negative_input {
    /** ADC0 pin. */
    ADC_NEGATIVE_INPUT_PIN0          = ADC_INPUTCTRL_MUXNEG_PIN0,
    /** ADC1 pin. */
    ADC_NEGATIVE_INPUT_PIN1          = ADC_INPUTCTRL_MUXNEG_PIN1,
    /** ADC2 pin. */
    ADC_NEGATIVE_INPUT_PIN2          = ADC_INPUTCTRL_MUXNEG_PIN2,
    /** ADC3 pin. */
    ADC_NEGATIVE_INPUT_PIN3          = ADC_INPUTCTRL_MUXNEG_PIN3,
    /** ADC4 pin. */
    ADC_NEGATIVE_INPUT_PIN4          = ADC_INPUTCTRL_MUXNEG_PIN4,
    /** ADC5 pin. */
    ADC_NEGATIVE_INPUT_PIN5          = ADC_INPUTCTRL_MUXNEG_PIN5,
    /** ADC6 pin. */
    ADC_NEGATIVE_INPUT_PIN6          = ADC_INPUTCTRL_MUXNEG_PIN6,
    /** ADC7 pin. */
    ADC_NEGATIVE_INPUT_PIN7          = ADC_INPUTCTRL_MUXNEG_PIN7,
    /** Internal ground. */
    ADC_NEGATIVE_INPUT_GND           = ADC_INPUTCTRL_MUXNEG_GND,
    /** I/O ground. */
    ADC_NEGATIVE_INPUT_IOGND         = ADC_INPUTCTRL_MUXNEG_IOGND,
};

/**
 * \brief ADC number of accumulated samples enum
 *
 * Enum for the possible numbers of ADC samples to accumulate.
 * This setting is only used when the \ref ADC_RESOLUTION_CUSTOM
 * resolution setting is used.
 *
 */
enum adc_accumulate_samples {
    /** No averaging. */
    ADC_ACCUMULATE_DISABLE      = ADC_AVGCTRL_SAMPLENUM_1,
    /** Average 2 samples. */
    ADC_ACCUMULATE_SAMPLES_2    = ADC_AVGCTRL_SAMPLENUM_2,
    /** Average 4 samples. */
    ADC_ACCUMULATE_SAMPLES_4    = ADC_AVGCTRL_SAMPLENUM_4,
    /** Average 8 samples. */
    ADC_ACCUMULATE_SAMPLES_8    = ADC_AVGCTRL_SAMPLENUM_8,
    /** Average 16 samples. */
    ADC_ACCUMULATE_SAMPLES_16   = ADC_AVGCTRL_SAMPLENUM_16,
    /** Average 32 samples. */
    ADC_ACCUMULATE_SAMPLES_32   = ADC_AVGCTRL_SAMPLENUM_32,
    /** Average 64 samples. */
    ADC_ACCUMULATE_SAMPLES_64   = ADC_AVGCTRL_SAMPLENUM_64,
    /** Average 128 samples. */
    ADC_ACCUMULATE_SAMPLES_128  = ADC_AVGCTRL_SAMPLENUM_128,
    /** Average 256 samples. */
    ADC_ACCUMULATE_SAMPLES_256  = ADC_AVGCTRL_SAMPLENUM_256,
    /** Average 512 samples. */
    ADC_ACCUMULATE_SAMPLES_512  = ADC_AVGCTRL_SAMPLENUM_512,
    /** Average 1024 samples. */
    ADC_ACCUMULATE_SAMPLES_1024 = ADC_AVGCTRL_SAMPLENUM_1024,
};

/**
 * \brief ADC possible dividers for the result register
 *
 * Enum for the possible division factors to use when accumulating
 * multiple samples. To keep the same resolution for the averaged
 * result and the actual input value, the division factor must
 * be equal to the number of samples accumulated. This setting is only
 * used when the \ref ADC_RESOLUTION_CUSTOM resolution setting is used.
 */
enum adc_divide_result {
    /** Don't divide result register after accumulation. */
    ADC_DIVIDE_RESULT_DISABLE = 0,
    /** Divide result register by 2 after accumulation. */
    ADC_DIVIDE_RESULT_2       = 1,
    /** Divide result register by 4 after accumulation. */
    ADC_DIVIDE_RESULT_4       = 2,
    /** Divide result register by 8 after accumulation. */
    ADC_DIVIDE_RESULT_8       = 3,
    /** Divide result register by 16 after accumulation. */
    ADC_DIVIDE_RESULT_16      = 4,
    /** Divide result register by 32 after accumulation. */
    ADC_DIVIDE_RESULT_32      = 5,
    /** Divide result register by 64 after accumulation. */
    ADC_DIVIDE_RESULT_64      = 6,
    /** Divide result register by 128 after accumulation. */
    ADC_DIVIDE_RESULT_128     = 7,
};

#if ADC_CALLBACK_MODE == true
/**
 * Enum for the possible ADC interrupt flags.
 */
enum adc_interrupt_flag {
    /** ADC result ready. */
    ADC_INTERRUPT_RESULT_READY = ADC_INTFLAG_RESRDY,
    /** Window monitor match. */
    ADC_INTERRUPT_WINDOW       = ADC_INTFLAG_WINMON,
    /** ADC result overwritten before read. */
    ADC_INTERRUPT_OVERRUN      = ADC_INTFLAG_OVERRUN,
};
#endif

/**
 * \brief ADC oversampling and decimation enum
 *
 * Enum for the possible numbers of bits resolution can be increased by when
 * using oversampling and decimation.
 *
 */
enum adc_oversampling_and_decimation {
    /** Don't use oversampling and decimation mode. */
    ADC_OVERSAMPLING_AND_DECIMATION_DISABLE = 0,
    /** 1 bit resolution increase. */
    ADC_OVERSAMPLING_AND_DECIMATION_1BIT,
    /** 2 bits resolution increase. */
    ADC_OVERSAMPLING_AND_DECIMATION_2BIT,
    /** 3 bits resolution increase. */
    ADC_OVERSAMPLING_AND_DECIMATION_3BIT,
    /** 4 bits resolution increase. */
    ADC_OVERSAMPLING_AND_DECIMATION_4BIT
};

/**
 * \brief Window monitor configuration structure
 *
 * Window monitor configuration structure.
 */
struct adc_window_config {
    /** Selected window mode. */
    enum adc_window_mode window_mode;
    /** Lower window value. */
    int32_t window_lower_value;
    /** Upper window value. */
    int32_t window_upper_value;
};

/**
 * \brief ADC event enable/disable structure.
 *
 * Event flags for the ADC module. This is used to enable and
 * disable events via \ref adc_enable_events() and \ref adc_disable_events().
 */
struct adc_events {
    /** Enable event generation on conversion done. */
    bool generate_event_on_conversion_done;
    /** Enable event generation on window monitor. */
    bool generate_event_on_window_monitor;
};

/**
 * \brief Gain and offset correction configuration structure
 *
 * Gain and offset correction configuration structure.
 * Part of the \ref adc_config struct and will  be initialized by
 * \ref adc_get_config_defaults.
 */
struct adc_correction_config {
    /**
     * Enables correction for gain and offset based on values of gain_correction and
     * offset_correction if set to true.
     */
    bool correction_enable;
    /**
     * This value defines how the ADC conversion result is compensated for gain
     * error before written to the result register. This is a fractional value,
     * 1-bit integer plus an 11-bit fraction, therefore
     * 1/2 <= gain_correction < 2. Valid \c gain_correction values ranges from
     * \c 0b010000000000 to \c 0b111111111111.
     */
    uint16_t gain_correction;
    /**
     * This value defines how the ADC conversion result is compensated for
     * offset error before written to the result register. This is a 12-bit
     * value in two's complement format.
     */
    int16_t offset_correction;
};

/**
 * \brief Pin scan configuration structure
 *
 * Pin scan configuration structure. Part of the \ref adc_config struct and will
 * be initialized by \ref adc_get_config_defaults.
 */
struct adc_pin_scan_config {
    /**
     * Offset (relative to selected positive input) of the first input pin to be
     * used in pin scan mode.
     */
    uint8_t offset_start_scan;
    /**
     * Number of input pins to scan in pin scan mode. A value below two will
     * disable pin scan mode.
     */
    uint8_t inputs_to_scan;
};

/**
 * \brief ADC configuration structure
 *
 * Configuration structure for an ADC instance. This structure should be
 * initialized by the \ref adc_get_config_defaults()
 * function before being modified by the user application.
 */
struct adc_config {
    /** GCLK generator used to clock the peripheral. */
    enum gclk_generator clock_source;
    /** Voltage reference. */
    enum adc_reference reference;
    /** Clock prescaler. */
    enum adc_clock_prescaler clock_prescaler;
    /** Result resolution. */
    enum adc_resolution resolution;
    /** Gain factor. */
    enum adc_gain_factor gain_factor;
    /** Positive MUX input. */
    enum adc_positive_input positive_input;
    /** Negative MUX input. For singled-ended conversion mode, the negative
     * input must be connected to ground. This ground could be the internal
     * GND, IOGND or an external ground connected to a pin. */
    enum adc_negative_input negative_input;
    /** Number of ADC samples to accumulate when using the
     *  \c ADC_RESOLUTION_CUSTOM mode.Note: if the result width increases,
     *  result resolution will be changed accordingly.
     */
    enum adc_accumulate_samples accumulate_samples;
    /** Division ration when using the ADC_RESOLUTION_CUSTOM mode. */
    enum adc_divide_result divide_result;
    /** Left adjusted result. */
    bool left_adjust;
    /** Enables differential mode if true.
     * if false, ADC will run in singled-ended mode. */
    bool differential_mode;
    /** Enables free running mode if true. */
    bool freerunning;
    /** Enables ADC in standby sleep mode if true. */
    bool run_in_standby;
    /**
     * Enables reference buffer offset compensation if true.
     * This will increase the accuracy of the gain stage, but decreases the input
     * impedance; therefore the startup time of the reference must be increased.
     */
    bool reference_compensation_enable;
    /**
     * This value (0-63) control the ADC sampling time in number of half ADC
     * prescaled clock cycles (depends of \c ADC_PRESCALER value), thus
     * controlling the ADC input impedance. Sampling time is set according to
     * the formula:
     * Sample time = (sample_length+1) * (ADCclk / 2).
     */
    uint8_t sample_length;
    /** Window monitor configuration structure. */
    struct adc_window_config window;
    /** Gain and offset correction configuration structure. */
    struct adc_correction_config correction;
    /** Event action to take on incoming event. */
    enum adc_event_action event_action;
    /** Pin scan configuration structure. */
    struct adc_pin_scan_config pin_scan;
};

/**
 * \brief ADC software device instance structure.
 *
 * ADC software instance structure, used to retain software state information
 * of an associated hardware module instance.
 *
 * \note The fields of this structure should not be altered by the user
 *       application; they are reserved for module-internal use only.
 */
struct adc_module {
#if !defined(__DOXYGEN__)
    /** Pointer to ADC hardware module. */
    Adc *hw;
    /** Keep reference configuration so we know when enable is called. */
    enum adc_reference reference;
#  if ADC_CALLBACK_MODE == true
    /** Array to store callback functions. */
    adc_callback_t callback[ADC_CALLBACK_N];
    /** Pointer to buffer used for ADC results. */
    volatile uint16_t *job_buffer;
    /** Remaining number of conversions in current job. */
    volatile uint16_t remaining_conversions;
    /** Bit mask for callbacks registered. */
    uint8_t registered_callback_mask;
    /** Bit mask for callbacks enabled. */
    uint8_t enabled_callback_mask;
    /** Holds the status of the ongoing or last conversion job. */
    volatile enum status_code job_status;
    /** If software triggering is needed. */
    bool software_trigger;
#  endif
#endif
};

#if !defined(__DOXYGEN__)

/**
 * \brief Determines if the hardware module(s) are currently synchronizing to the bus.
 *
 * Checks to see if the underlying hardware peripheral module(s) are currently
 * synchronizing across multiple clock domains to the hardware bus. This
 * function can be used to delay further operations on a module until such time
 * that it is ready, to prevent blocking delays for synchronization in the
 * user application.
 *
 * \param[in] module_inst  Pointer to the ADC software instance struct
 *
 * \return Synchronization status of the underlying hardware module(s).
 *
 * \retval true if the module synchronization is ongoing
 * \retval false if the module has completed synchronization
 */
static inline bool adc_is_syncing(
    struct adc_module *const module_inst)
{
    /* Sanity check arguments */
    Assert(module_inst);

    Adc *const adc_module = module_inst->hw;

    if (adc_module->STATUS.reg & ADC_STATUS_SYNCBUSY) {
        return true;
    }

    return false;
}
#endif

/**
 * \name ADC Gain and Pin Scan Mode
 * @{
 */

/**
 * \brief Sets ADC gain factor
 *
 * Sets the ADC gain factor to a specified gain setting.
 *
 * \param[in] module_inst  Pointer to the ADC software instance struct
 * \param[in] gain_factor  Gain factor value to set
 */
static inline void adc_set_gain(
    struct adc_module *const module_inst,
    const enum adc_gain_factor gain_factor)
{
    /* Sanity check arguments */
    Assert(module_inst);
    Assert(module_inst->hw);

    Adc *const adc_module = module_inst->hw;

    while (adc_is_syncing(module_inst)) {
        /* Wait for synchronization */
    }

    /* Set new gain factor */
    adc_module->INPUTCTRL.reg =
        (adc_module->INPUTCTRL.reg & ~ADC_INPUTCTRL_GAIN_Msk) |
        (gain_factor);
}

/**
 * \brief Sets the ADC pin scan mode
 *
 * Configures the pin scan mode of the ADC module. In pin scan mode, the first
 * conversion will start at the configured positive input + start_offset. When
 * a conversion is done, a conversion will start on the next input, until
 * \c inputs_to_scan number of conversions are made.
 *
 * \param[in] module_inst     Pointer to the ADC software instance struct
 * \param[in] inputs_to_scan  Number of input pins to perform a conversion on
 *                            (must be two or more)
 * \param[in] start_offset    Offset of first pin to scan (relative to
 *                            configured positive input)
 *
 * \return Status of the pin scan configuration set request.
 *
 * \retval STATUS_OK               Pin scan mode has been set successfully
 * \retval STATUS_ERR_INVALID_ARG  Number of input pins to scan or offset has
 *                                 an invalid value
 */
static inline enum status_code adc_set_pin_scan_mode(
    struct adc_module *const module_inst,
    uint8_t inputs_to_scan,
    const uint8_t start_offset)

{
    /* Sanity check arguments */
    Assert(module_inst);
    Assert(module_inst->hw);

    Adc *const adc_module = module_inst->hw;

    if (inputs_to_scan > 0) {
        /*
        * Number of input sources included is the value written to INPUTSCAN
        * plus 1.
        */
        inputs_to_scan--;
    }

    if (inputs_to_scan > (ADC_INPUTCTRL_INPUTSCAN_Msk >> ADC_INPUTCTRL_INPUTSCAN_Pos) ||
            start_offset > (ADC_INPUTCTRL_INPUTOFFSET_Msk >> ADC_INPUTCTRL_INPUTOFFSET_Pos)) {
        /* Invalid number of input pins */
        return STATUS_ERR_INVALID_ARG;
    }

    while (adc_is_syncing(module_inst)) {
        /* Wait for synchronization */
    }

    /* Set pin scan mode */
    adc_module->INPUTCTRL.reg =
        (adc_module->INPUTCTRL.reg &
         ~(ADC_INPUTCTRL_INPUTSCAN_Msk | ADC_INPUTCTRL_INPUTOFFSET_Msk)) |
        (start_offset   << ADC_INPUTCTRL_INPUTOFFSET_Pos) |
        (inputs_to_scan << ADC_INPUTCTRL_INPUTSCAN_Pos);

    return STATUS_OK;
}

/**
 * \brief Disables pin scan mode
 *
 * Disables pin scan mode. The next conversion will be made on only one pin
 * (the configured positive input pin).
 *
 * \param[in] module_inst  Pointer to the ADC software instance struct
 */
static inline void adc_disable_pin_scan_mode(
    struct adc_module *const module_inst)
{
    /* Disable pin scan mode */
    adc_set_pin_scan_mode(module_inst, 0, 0);
}

/** @} */

#ifdef __cplusplus
}
#endif

/** @} */

#endif /* ADC_FEATURE_H_INCLUDED */