owner-nrf52sdk/nRF5_SDK_15.3.0/modules/nrfx/drivers/src/nrfx_nfct.c

/**
 * Copyright (c) 2018 - 2019, 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
 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA OR CONTRIBUTORS 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.
 *
 */

#include <nrfx.h>

#if NRFX_CHECK(NRFX_NFCT_ENABLED)

#include <nrfx_nfct.h>

#define NRFX_LOG_MODULE NFCT
#include <nrfx_log.h>

#if defined(NRF52832_XXAA) || defined(NRF52832_XXAB) || defined(NRF52840_XXAA)
#define USE_TIMER_WORKAROUND
#endif

#ifdef USE_TIMER_WORKAROUND
#include <nrfx_timer.h>

typedef struct
{
    const nrfx_timer_t timer;                     /**< Timer instance that supports the correct NFC field detection. */
#ifdef NRF52840_XXAA
    bool               fieldevents_filter_active; /**< Flag that indicates that the field events are ignored. */
    bool               is_hfclk_on;               /**< HFCLK has started - one of the NFC activation conditions. */
    bool               is_delayed;                /**< Required time delay has passed - one of the NFC activation conditions. */
#else
    uint32_t           field_state_cnt;           /**< Counter of the FIELDLOST events. */
#endif // NRF52840_XXAA
} nrfx_nfct_timer_workaround_t;

#ifdef NRF52840_XXAA
    #define NRFX_NFCT_ACTIVATE_DELAY     1000 /**< Minimal delay in us between NFC field detection and activation of NFCT. */
    #define NRFX_NFCT_TIMER_PERIOD       NRFX_NFCT_ACTIVATE_DELAY
#else
    #define NRFX_NFCT_FIELDLOST_THR      7
    #define NRFX_NFCT_FIELD_TIMER_PERIOD 100  /**< Field polling period in us. */
    #define NRFX_NFCT_TIMER_PERIOD       NRFX_NFCT_FIELD_TIMER_PERIOD
#endif // NRF52840_XXAA
#define NRFX_NFCT_TIMER_INSTANCE         4    /**< Timer instance used for various workarounds for the NFCT HW issues.*/

static nrfx_nfct_timer_workaround_t m_timer_workaround = 
{
    .timer = NRFX_TIMER_INSTANCE(NRFX_NFCT_TIMER_INSTANCE),
};
#endif // USE_TIMER_WORKAROUND

#define NRFX_NFCT_FRAMEDELAYMAX_52840S (0xFFFFUL) /**< Bit mask of the FRAMEDELAYMAX field for the first sample of 52840.*/
#define NRFX_NFCT_FWT_MAX_DIFF         1u         /**< The maximal difference between the requested FWT and HW-limited FWT settings.*/

/* Mask of all possible interrupts that are relevant for data reception. */
#define NRFX_NFCT_RX_INT_MASK (NRF_NFCT_INT_RXFRAMESTART_MASK | \
                               NRF_NFCT_INT_RXFRAMEEND_MASK   | \
                               NRF_NFCT_INT_RXERROR_MASK)

/* Mask of all possible interrupts that are relevant for data transmission. */
#define NRFX_NFCT_TX_INT_MASK (NRF_NFCT_INT_TXFRAMESTART_MASK | \
                               NRF_NFCT_INT_TXFRAMEEND_MASK)


/* Mask of all possible errors from the @ref NRF_NFCT_EVENT_RXERROR event. */
#define NRFX_NFCT_FRAME_STATUS_RX_ALL_MASK (NRF_NFCT_RX_FRAME_STATUS_CRC_MASK    | \
                                            NRF_NFCT_RX_FRAME_STATUS_PARITY_MASK | \
                                            NRF_NFCT_RX_FRAME_STATUS_OVERRUN_MASK)

/* Mask of all possible errors from the @ref NRF_NFCT_EVENT_ERROR event. */
#if defined (NRF52832_XXAA) || defined(NRF52832_XXAB)
#define NRFX_NFCT_ERROR_STATUS_ALL_MASK (NRF_NFCT_ERROR_FRAMEDELAYTIMEOUT_MASK | \
                                         NRF_NFCT_ERROR_NFCFIELDTOOSTRONG_MASK | \
                                         NRF_NFCT_ERROR_NFCFIELDTOOWEAK_MASK)
#else
#define NRFX_NFCT_ERROR_STATUS_ALL_MASK (NRF_NFCT_ERROR_FRAMEDELAYTIMEOUT_MASK)
#endif

/* Macros for conversion of bits to bytes. */
#define NRFX_NFCT_BYTES_TO_BITS(_bytes) ((_bytes) << 3)
#define NRFX_NFCT_BITS_TO_BYTES(_bits)  ((_bits)  >> 3)

/* Macro for checking whether the NFCT interrupt is active. */
#define NRFX_NFCT_EVT_ACTIVE(_name) (nrf_nfct_event_check(NRFX_CONCAT_2(NRF_NFCT_EVENT_, _name)) &&        \
                                     nrf_nfct_int_enable_check(NRFX_CONCAT_3(NRF_NFCT_INT_, _name, _MASK)))

/* Macro for callback execution. */
#define NRFX_NFCT_CB_HANDLE(_cb, _evt) \
    if (_cb != NULL)                   \
    {                                  \
        _cb(&_evt);                    \
    }

typedef enum
{
    NRFX_NFC_FIELD_STATE_NONE,   /**< Initial value that indicates no NFCT field events. */
    NRFX_NFC_FIELD_STATE_OFF,    /**< The NFCT FIELDLOST event has been set. */
    NRFX_NFC_FIELD_STATE_ON,     /**< The NFCT FIELDDETECTED event has been set. */
    NRFX_NFC_FIELD_STATE_UNKNOWN /**< Both NFCT field events have been set - ambiguous state. */
} nrfx_nfct_field_state_t;

#ifdef NRF52840_XXAA
/**
 * @brief Internal auxiliary function for checking whether the program is running on the NRF52840 chip.
 *
 * @retval true  It is NRF52480 chip.
 * @retval false It is an other chip.
 */
static inline bool nrfx_nfct_type_52840_check(void)
{
    return ((((*(uint32_t *)0xF0000FE0) & 0xFF) == 0x08) &&
        (((*(uint32_t *)0xF0000FE4) & 0x0F) == 0x0));
}

/**
 * @brief Internal auxiliary function for checking whether the program is running on the first sample of
 *        the nRF52840 chip.
 *
 * @retval true  It is the nRF52480 chip and it is the first sample version.
 * @retval false It is an other chip.
 */
static inline bool nrfx_nfct_type_52840_sample_check(void)
{
    return ( nrfx_nfct_type_52840_check() &&
               ( ((*(uint32_t *)0xF0000FE8) & 0xF0) == 0x00 ) &&
               ( ((*(uint32_t *)0xF0000FEC) & 0xF0) == 0x00 ) );
}

/**
 * @brief Internal auxiliary function for checking whether the program is running on the final version of
 *        the nRF52840 chip.
 *
 * @retval true  It is the nRF52480 chip and it is the final version.
 * @retval false It is an other chip.
 */
static inline bool nrfx_nfct_type_52840_final_check(void)
{
    return ( nrfx_nfct_type_52840_check() &&
              ( ( ((*(uint32_t *)0xF0000FE8) & 0xF0) != 0x00 ) ||
                ( ((*(uint32_t *)0xF0000FEC) & 0xF0) != 0x00 ) ));
}

typedef struct
{
    bool eng_a;  /**< Engineering sample A of the NRF52840 chip. */
    bool eng_bc; /**< Engineering sample B, C of the NRF52840 chip, or its final version. */
} nrfx_nfct_nrf52840_ver_t;

static nrfx_nfct_nrf52840_ver_t m_nrf52840;
#endif // NRF52840_XXAA

/**@brief NFCT control block. */
typedef struct
{
    nrfx_nfct_config_t config;
    nrfx_drv_state_t   state;
    volatile bool      field_on;
} nrfx_nfct_control_block_t;

static nrfx_nfct_control_block_t m_nfct_cb;

/**
 * @brief Common part of the setup used for the NFCT initialization and reinitialization.
 */
static void nrfx_nfct_hw_init_setup(void)
{
#ifdef NRF52840_XXAA
    if (m_nrf52840.eng_a)
    {
        /* Begin: Bugfix for FTPAN-98 */
        *(volatile uint32_t *) 0x4000568C = 0x00038148;
        /* End: Bugfix for FTPAN-98 */
        /* Begin: Bugfix for FTPAN-144 */
        *(volatile uint32_t *) 0x4000561c = 0x01;
        *(volatile uint32_t *) 0x4000562c = 0x3F;
        *(volatile uint32_t *) 0x4000563c = 0x0;
        /* End: Bugfix for FTPAN-144 */
    }
#endif // NRF52840_XXAA

    // Use Window Grid frame delay mode.
    nrf_nfct_frame_delay_mode_set(NRF_NFCT_FRAME_DELAY_MODE_WINDOWGRID);

    /* Begin: Bugfix for FTPAN-25 (IC-9929) */
    /* Workaround for wrong SENSRES values require using SDD00001, but here SDD00100 is used
       because it is required to operate with Windows Phone */
    nrf_nfct_sensres_bit_frame_sdd_set(NRF_NFCT_SENSRES_BIT_FRAME_SDD_00100);
    /* End: Bugfix for FTPAN-25 (IC-9929) */
}

/**@brief Function for evaluating and handling the NFC field events.
 *
 * @param[in]  field_state  Current field state.
 */
static void nrfx_nfct_field_event_handler(volatile nrfx_nfct_field_state_t field_state)
{
    nrfx_nfct_evt_t nfct_evt;

#ifdef NRF52840_XXAA
    if((!m_nrf52840.eng_a) && (m_timer_workaround.fieldevents_filter_active))
    {
        return;
    }
#endif // NRF52840_XXAA

    if (field_state == NRFX_NFC_FIELD_STATE_UNKNOWN)
    {
        /* Probe NFC field */
        field_state = (nrfx_nfct_field_check()) ? NRFX_NFC_FIELD_STATE_ON : NRFX_NFC_FIELD_STATE_OFF;
    }

    /* Field event service */
    switch (field_state)
    {
        case NRFX_NFC_FIELD_STATE_ON:
            if (!m_nfct_cb.field_on)
            {
#ifdef NRF52840_XXAA
                /* Begin: Bugfix for FTPAN-190 */
                if (!m_nrf52840.eng_a)
                {
                    m_timer_workaround.is_hfclk_on               = false;
                    m_timer_workaround.is_delayed                = false;
                    m_timer_workaround.fieldevents_filter_active = true;

                    nrfx_timer_clear(&m_timer_workaround.timer);
                    nrfx_timer_enable(&m_timer_workaround.timer);
                }
                /* END: Bugfix for FTPAN-190 */
#elif defined(NRF52832_XXAA) || defined(NRF52832_XXAB)
                nrfx_timer_clear(&m_timer_workaround.timer);
                nrfx_timer_enable(&m_timer_workaround.timer);
                m_timer_workaround.field_state_cnt = 0;  
#endif // NRF52840_XXAA

                m_nfct_cb.field_on = true;
                nfct_evt.evt_id    = NRFX_NFCT_EVT_FIELD_DETECTED;
                NRFX_NFCT_CB_HANDLE(m_nfct_cb.config.cb, nfct_evt);
            }
            break;

        case NRFX_NFC_FIELD_STATE_OFF:
            nrfx_nfct_state_force(NRFX_NFCT_STATE_SENSING);
#ifdef NRF52840_XXAA
            /* Begin: Bugfix for FTPAN-116 (IC-12886) */
            if (m_nrf52840.eng_a)
            {
                *(volatile uint32_t *)0x40005010 = 1;
            }
            /* END: Bugfix for FTPAN-116 (IC-12886) */
#endif // NRF52840_XXAA
            nrf_nfct_int_disable(NRFX_NFCT_RX_INT_MASK | NRFX_NFCT_TX_INT_MASK);
            m_nfct_cb.field_on = false;
            nfct_evt.evt_id    = NRFX_NFCT_EVT_FIELD_LOST;

            NRFX_NFCT_CB_HANDLE(m_nfct_cb.config.cb, nfct_evt);
            break;

        default:
            /* No implementation required */
            break;
    }
}

#ifdef USE_TIMER_WORKAROUND

#ifdef NRF52840_XXAA
static void nrfx_nfct_activate_check(void)
{
    static bool is_field_validation_pending = false;

    if (is_field_validation_pending)
    {
        is_field_validation_pending                  = false;
        m_timer_workaround.fieldevents_filter_active = false;

        // Check the field status and take action if field is lost.
        nrfx_nfct_field_event_handler(NRFX_NFC_FIELD_STATE_UNKNOWN);
        return;
    }

    if ((m_timer_workaround.is_hfclk_on) && (m_timer_workaround.is_delayed))
    {
        nrf_nfct_task_trigger(NRF_NFCT_TASK_ACTIVATE);
        is_field_validation_pending = true;

        // Start the timer second time to validate whether the tag has locked to the field.
        nrfx_timer_clear(&m_timer_workaround.timer);
        nrfx_timer_enable(&m_timer_workaround.timer);
    }
}
#endif // NRF52840_XXAA

#if defined(NRF52832_XXAA) || defined(NRF52832_XXAB)
static inline void nrfx_nfct_reset(void)
{
    uint32_t                       fdm;
    uint32_t                       int_enabled;
    uint8_t                        nfcid1[NRF_NFCT_SENSRES_NFCID1_SIZE_TRIPLE];
    nrf_nfct_sensres_nfcid1_size_t nfcid1_size;
    nrf_nfct_selres_protocol_t     protocol;

    // Save parameter settings before the reset of the NFCT peripheral.
    fdm         = nrf_nfct_frame_delay_max_get();
    nfcid1_size = nrf_nfct_nfcid1_get(nfcid1);
    protocol    = nrf_nfct_selsres_protocol_get();
    int_enabled = nrf_nfct_int_enable_get();

    // Reset the NFCT peripheral.
    *(volatile uint32_t *)0x40005FFC = 0;
    *(volatile uint32_t *)0x40005FFC;
    *(volatile uint32_t *)0x40005FFC = 1;

    // Restore parameter settings after the reset of the NFCT peripheral.
    nrf_nfct_frame_delay_max_set(fdm);
    nrf_nfct_nfcid1_set(nfcid1, nfcid1_size);
    nrf_nfct_selres_protocol_set(protocol);

    // Restore general HW configuration.
    nrfx_nfct_hw_init_setup();

    // Restore interrupts.
    nrf_nfct_int_enable(int_enabled);

    // Disable interrupts associated with data exchange.
    nrf_nfct_int_disable(NRFX_NFCT_RX_INT_MASK | NRFX_NFCT_TX_INT_MASK);

    NRFX_LOG_INFO("Reinitialize");
}

static void nrfx_nfct_field_poll(void)
{
    if (!nrfx_nfct_field_check())
    {
        if (++m_timer_workaround.field_state_cnt > NRFX_NFCT_FIELDLOST_THR)
        {
            nrfx_nfct_evt_t nfct_evt =
            {
                .evt_id = NRFX_NFCT_EVT_FIELD_LOST,
            };

            nrfx_timer_disable(&m_timer_workaround.timer);
            m_nfct_cb.field_on = false;

            /* Begin: Bugfix for FTPAN-116 */
            // resume the NFCT to initialized state
            nrfx_nfct_reset();
            /* End: Bugfix for FTPAN-116 */

            NRFX_NFCT_CB_HANDLE(m_nfct_cb.config.cb, nfct_evt);
        }
        return;
    }

    m_timer_workaround.field_state_cnt = 0;
}
#endif // defined(NRF52832_XXAA) || defined(NRF52832_XXAB)

static void nrfx_nfct_field_timer_handler(nrf_timer_event_t event_type, void * p_context)
{
    (void)p_context;

    if (event_type != NRF_TIMER_EVENT_COMPARE0)
    {
        return;
    }

#ifdef NRF52840_XXAA
    m_timer_workaround.is_delayed = true;

    nrfx_timer_disable(&m_timer_workaround.timer);
    nrfx_nfct_activate_check();
#else
    nrfx_nfct_field_poll();
#endif //NRF52840_XXAA
}

static inline nrfx_err_t nrfx_nfct_field_timer_config(void)
{
    nrfx_err_t          err_code;
    nrfx_timer_config_t timer_cfg = 
    {
        .frequency          = NRF_TIMER_FREQ_1MHz,
        .mode               = NRF_TIMER_MODE_TIMER,
        .bit_width          = NRF_TIMER_BIT_WIDTH_16,
        .interrupt_priority = NRFX_NFCT_CONFIG_IRQ_PRIORITY
    };

    err_code = nrfx_timer_init(&m_timer_workaround.timer, &timer_cfg, nrfx_nfct_field_timer_handler);
    if (err_code != NRFX_SUCCESS)
    {
        return err_code;
    }

    nrfx_timer_extended_compare(&m_timer_workaround.timer,
                                NRF_TIMER_CC_CHANNEL0,
                                nrfx_timer_us_to_ticks(&m_timer_workaround.timer, NRFX_NFCT_TIMER_PERIOD),
                                NRF_TIMER_SHORT_COMPARE0_CLEAR_MASK,
                                true);
    return err_code;
}

#endif // USE_TIMER_WORKAROUND

static inline nrf_nfct_sensres_nfcid1_size_t nrf_nfct_nfcid1_size_to_sensres_size(uint8_t nfcid1_size)
{
    switch (nfcid1_size)
    {
        case NRFX_NFCT_NFCID1_SINGLE_SIZE:
            return NRF_NFCT_SENSRES_NFCID1_SIZE_SINGLE;

        case NRFX_NFCT_NFCID1_DOUBLE_SIZE:
            return NRF_NFCT_SENSRES_NFCID1_SIZE_DOUBLE;

        case NRFX_NFCT_NFCID1_TRIPLE_SIZE:
            return NRF_NFCT_SENSRES_NFCID1_SIZE_TRIPLE;

        default:
            return NRF_NFCT_SENSRES_NFCID1_SIZE_DOUBLE;
    }
}

static inline void nrfx_nfct_rxtx_int_enable(uint32_t rxtx_int_mask)
{
    nrf_nfct_int_enable(rxtx_int_mask & m_nfct_cb.config.rxtx_int_mask);
}

nrfx_err_t nrfx_nfct_init(nrfx_nfct_config_t const * p_config)
{
    NRFX_ASSERT(p_config);

    nrfx_err_t err_code = NRFX_SUCCESS;

    if (m_nfct_cb.state != NRFX_DRV_STATE_UNINITIALIZED)
    {
        return NRFX_ERROR_INVALID_STATE;
    }

#ifdef NRF52840_XXAA
    m_nrf52840.eng_a  = nrfx_nfct_type_52840_sample_check();
    m_nrf52840.eng_bc = nrfx_nfct_type_52840_final_check();
#endif // NRF52840_XXAA

    m_nfct_cb.config = *p_config;
    nrfx_nfct_hw_init_setup();

    NRFX_IRQ_PENDING_CLEAR(NFCT_IRQn);
    NRFX_IRQ_PRIORITY_SET(NFCT_IRQn, NRFX_NFCT_CONFIG_IRQ_PRIORITY);
    NRFX_IRQ_ENABLE(NFCT_IRQn);

#ifdef USE_TIMER_WORKAROUND
    /* Initialize Timer module as the workaround for NFCT HW issues. */
    #ifdef NRF52840_XXAA
    if (!m_nrf52840.eng_a)
    #endif // NRF52840_XXAA
    {
        err_code = nrfx_nfct_field_timer_config();
    }
#endif // USE_TIMER_WORKAROUND

    if (err_code == NRFX_SUCCESS)
    {
        uint8_t default_nfcid1[NRFX_NFCT_NFCID1_DEFAULT_LEN];
        err_code = nrfx_nfct_nfcid1_default_bytes_get(default_nfcid1, sizeof(default_nfcid1));
        NRFX_ASSERT(err_code == NRFX_SUCCESS);
        nrf_nfct_nfcid1_set(default_nfcid1, NRF_NFCT_SENSRES_NFCID1_SIZE_DEFAULT);
    }
    else
    {
        return err_code;
    }

    m_nfct_cb.state = NRFX_DRV_STATE_INITIALIZED;

    NRFX_LOG_INFO("Initialized");
    return err_code;
}

void nrfx_nfct_uninit(void)
{
    nrfx_nfct_disable();

    NRFX_IRQ_DISABLE(NFCT_IRQn);
    NRFX_IRQ_PENDING_CLEAR(NFCT_IRQn);

#ifdef USE_TIMER_WORKAROUND
    /* Initialize Timer module as the workaround for NFCT HW issues. */
    #ifdef NRF52840_XXAA
    if (!m_nrf52840.eng_a)
    #endif // NRF52840_XXAA
    {
        nrfx_timer_uninit(&m_timer_workaround.timer);
    }
#endif // USE_TIMER_WORKAROUND

    m_nfct_cb.state = NRFX_DRV_STATE_UNINITIALIZED;
}

void nrfx_nfct_enable(void)
{
    nrf_nfct_error_status_clear(NRFX_NFCT_ERROR_STATUS_ALL_MASK);
    nrf_nfct_task_trigger(NRF_NFCT_TASK_SENSE);

    nrf_nfct_int_enable(NRF_NFCT_INT_FIELDDETECTED_MASK | NRF_NFCT_INT_ERROR_MASK |
                        NRF_NFCT_INT_SELECTED_MASK);
#if !defined(NRF52832_XXAA) && !defined(NRF52832_XXAB)
    nrf_nfct_int_enable(NRF_NFCT_INT_FIELDLOST_MASK);
#endif //!defined(NRF52832_XXAA) && !defined(NRF52832_XXAB)

    NRFX_LOG_INFO("Start");
}

void nrfx_nfct_disable(void)
{
    nrf_nfct_int_disable(NRF_NFCT_DISABLE_ALL_INT);
    nrf_nfct_task_trigger(NRF_NFCT_TASK_DISABLE);

    NRFX_LOG_INFO("Stop");
}

bool nrfx_nfct_field_check(void)
{
    uint32_t const field_state = nrf_nfct_field_status_get();

    if (((field_state & NRF_NFCT_FIELD_STATE_PRESENT_MASK) == 0) &&
        ((field_state & NRF_NFCT_FIELD_STATE_LOCK_MASK) == 0))
    {
        // Field is not active
        return false;
    }

    return true;
}

void nrfx_nfct_rx(nrfx_nfct_data_desc_t const * p_tx_data)
{
    NRFX_ASSERT(p_tx_data);

    nrf_nfct_rxtx_buffer_set((uint8_t *) p_tx_data->p_data, p_tx_data->data_size);

    nrfx_nfct_rxtx_int_enable(NRFX_NFCT_RX_INT_MASK);
    nrf_nfct_task_trigger(NRF_NFCT_TASK_ENABLERXDATA);
}

nrfx_err_t nrfx_nfct_tx(nrfx_nfct_data_desc_t const * p_tx_data,
                        nrf_nfct_frame_delay_mode_t   delay_mode)
{
    NRFX_ASSERT(p_tx_data);
    NRFX_ASSERT(p_tx_data->p_data);

    if (p_tx_data->data_size == 0)
    {
        return NRFX_ERROR_INVALID_LENGTH;
    }

    nrf_nfct_rxtx_buffer_set((uint8_t *) p_tx_data->p_data, p_tx_data->data_size);
    nrf_nfct_tx_bits_set(NRFX_NFCT_BYTES_TO_BITS(p_tx_data->data_size));
    nrf_nfct_frame_delay_mode_set((nrf_nfct_frame_delay_mode_t) delay_mode);

    nrfx_nfct_rxtx_int_enable(NRFX_NFCT_TX_INT_MASK);
    nrf_nfct_task_trigger(NRF_NFCT_TASK_STARTTX);

    NRFX_LOG_INFO("Tx start");
    return NRFX_SUCCESS;
}

void nrfx_nfct_state_force(nrfx_nfct_state_t state)
{
#ifdef NRF52840_XXAA
    if ((m_nrf52840.eng_bc) && (state == NRFX_NFCT_STATE_ACTIVATED))
    {
        m_timer_workaround.is_hfclk_on = true;
        nrfx_nfct_activate_check();
    }
#endif
    {
        nrf_nfct_task_trigger((nrf_nfct_task_t) state);
    }
}

void nrfx_nfct_init_substate_force(nrfx_nfct_active_state_t sub_state)
{
    if (sub_state == NRFX_NFCT_ACTIVE_STATE_DEFAULT)
    {
#if defined(NRF52832_XXAA) || defined(NRF52832_XXAB)
        if (((*(uint32_t volatile *)(0x40005420)) & 0x1UL) == (1UL))
#else
        if (nrf_nfct_sleep_state_get() == NRF_NFCT_SLEEP_STATE_SLEEP_A)
#endif //defined(NRF52832_XXAA) || defined(NRF52832_XXAB)
        {
            // Default state is SLEEP_A
            nrf_nfct_task_trigger(NRF_NFCT_TASK_GOSLEEP);
        }
        else
        {
            // Default state is IDLE
            nrf_nfct_task_trigger(NRF_NFCT_TASK_GOIDLE);
        }
    }
    else
    {
        nrf_nfct_task_trigger((nrf_nfct_task_t) sub_state);
    }

    /* Disable TX/RX here (will be enabled at SELECTED) */
    nrf_nfct_int_disable(NRFX_NFCT_RX_INT_MASK | NRFX_NFCT_TX_INT_MASK);
}

nrfx_err_t nrfx_nfct_parameter_set(nrfx_nfct_param_t const * p_param)
{
    NRFX_ASSERT(p_param);

    switch (p_param->id)
    {
        case NRFX_NFCT_PARAM_ID_FDT:
        {
            uint32_t delay     = p_param->data.fdt;
            uint32_t delay_thr = NFCT_FRAMEDELAYMAX_FRAMEDELAYMAX_Msk;

#ifdef NRF52840_XXAA
            delay_thr = (m_nrf52840.eng_a) ? NRFX_NFCT_FRAMEDELAYMAX_52840S : delay_thr;
#endif // NRF52840_XXAA

            // Delay validation.
            if (delay > (delay_thr + NRFX_NFCT_FWT_MAX_DIFF))
            {
                return NRFX_ERROR_INVALID_PARAM;
            }

            delay = (delay > delay_thr) ? delay_thr : delay;
            nrf_nfct_frame_delay_max_set(delay);
            break;
        }

        case NRFX_NFCT_PARAM_ID_SEL_RES:
            if (p_param->data.sel_res_protocol > NRF_NFCT_SELRES_PROTOCOL_NFCDEP_T4AT)
            {
                return NRFX_ERROR_INVALID_PARAM;
            }

            nrf_nfct_selres_protocol_set((nrf_nfct_selres_protocol_t) p_param->data.sel_res_protocol);
            break;

        case NRFX_NFCT_PARAM_ID_NFCID1:
        {
            nrf_nfct_sensres_nfcid1_size_t id_size_mask;

            id_size_mask = nrf_nfct_nfcid1_size_to_sensres_size(p_param->data.nfcid1.id_size);
            nrf_nfct_nfcid1_set(p_param->data.nfcid1.p_id, id_size_mask);
            break;
        }

        default:
            break;
    }

    return NRFX_SUCCESS;
}

nrfx_err_t nrfx_nfct_nfcid1_default_bytes_get(uint8_t * const p_nfcid1_buff,
                                              uint32_t        nfcid1_buff_len)
{
    if ((nfcid1_buff_len != NRFX_NFCT_NFCID1_SINGLE_SIZE) &&
        (nfcid1_buff_len != NRFX_NFCT_NFCID1_DOUBLE_SIZE) &&
        (nfcid1_buff_len != NRFX_NFCT_NFCID1_TRIPLE_SIZE))
    {
        return NRFX_ERROR_INVALID_LENGTH;
    }

    uint32_t nfc_tag_header0 = NRF_FICR->NFC.TAGHEADER0;
    uint32_t nfc_tag_header1 = NRF_FICR->NFC.TAGHEADER1;
    uint32_t nfc_tag_header2 = NRF_FICR->NFC.TAGHEADER2;

    p_nfcid1_buff[0] = (uint8_t) (nfc_tag_header0 >> 0);
    p_nfcid1_buff[1] = (uint8_t) (nfc_tag_header0 >> 8);
    p_nfcid1_buff[2] = (uint8_t) (nfc_tag_header0 >> 16);
    p_nfcid1_buff[3] = (uint8_t) (nfc_tag_header1 >> 0);

    if (nfcid1_buff_len != NRFX_NFCT_NFCID1_SINGLE_SIZE)
    {
        p_nfcid1_buff[4] = (uint8_t) (nfc_tag_header1 >> 8);
        p_nfcid1_buff[5] = (uint8_t) (nfc_tag_header1 >> 16);
        p_nfcid1_buff[6] = (uint8_t) (nfc_tag_header1 >> 24);

        if (nfcid1_buff_len == NRFX_NFCT_NFCID1_TRIPLE_SIZE)
        {
            p_nfcid1_buff[7] = (uint8_t) (nfc_tag_header2 >> 0);
            p_nfcid1_buff[8] = (uint8_t) (nfc_tag_header2 >> 8);
            p_nfcid1_buff[9] = (uint8_t) (nfc_tag_header2 >> 16);
        }
        /* Begin: Bugfix for FTPAN-181. */
        /* Workaround for wrong value in NFCID1. Value 0x88 cannot be used as byte 3 
           of a double-size NFCID1, according to the NFC Forum Digital Protocol specification. */
        else if (p_nfcid1_buff[3] == 0x88)
        {
            p_nfcid1_buff[3] |= 0x11;
        }
        /* End: Bugfix for FTPAN-181 */
    }

    return NRFX_SUCCESS;
}

void nrfx_nfct_autocolres_enable(void)
{
#if defined(NRF52832_XXAA) || defined(NRF52832_XXAB)
    (*(uint32_t *)(0x4000559C)) &= (~(0x1UL));
#else
    nrf_nfct_autocolres_enable();
#endif //defined(NRF52832_XXAA) || defined(NRF52832_XXAB)
}

void nrfx_nfct_autocolres_disable(void)
{
#if defined(NRF52832_XXAA) || defined(NRF52832_XXAB)
    (*(uint32_t *)(0x4000559C)) |= (0x1UL);
#else
    nrf_nfct_autocolres_disable();
#endif //defined(NRF52832_XXAA) || defined(NRF52832_XXAB)
}

void nrfx_nfct_irq_handler(void)
{
    nrfx_nfct_field_state_t current_field = NRFX_NFC_FIELD_STATE_NONE;

    if (NRFX_NFCT_EVT_ACTIVE(FIELDDETECTED))
    {
        nrf_nfct_event_clear(NRF_NFCT_EVENT_FIELDDETECTED);
        current_field = NRFX_NFC_FIELD_STATE_ON;

        NRFX_LOG_DEBUG("Field detected");
    }

#if !defined(NRF52832_XXAA) && !defined(NRF52832_XXAB)
    if (NRFX_NFCT_EVT_ACTIVE(FIELDLOST))
    {
        nrf_nfct_event_clear(NRF_NFCT_EVENT_FIELDLOST);
        current_field = (current_field == NRFX_NFC_FIELD_STATE_NONE) ? 
                        NRFX_NFC_FIELD_STATE_OFF : NRFX_NFC_FIELD_STATE_UNKNOWN;

        NRFX_LOG_DEBUG("Field lost");
    }
#endif //!defined(NRF52832_XXAA) && !defined(NRF52832_XXAB)

    /* Perform actions if any FIELD event is active */
    if (current_field != NRFX_NFC_FIELD_STATE_NONE)
    {
        nrfx_nfct_field_event_handler(current_field);
    }

    if (NRFX_NFCT_EVT_ACTIVE(RXFRAMEEND))
    {
        nrf_nfct_event_clear(NRF_NFCT_EVENT_RXFRAMEEND);

        nrfx_nfct_evt_t nfct_evt =
        {
            .evt_id = NRFX_NFCT_EVT_RX_FRAMEEND
        };

        /* Take into account only the number of whole bytes. */
        nfct_evt.params.rx_frameend.rx_status         = 0;
        nfct_evt.params.rx_frameend.rx_data.p_data    = nrf_nfct_rxtx_buffer_get();
        nfct_evt.params.rx_frameend.rx_data.data_size = NRFX_NFCT_BITS_TO_BYTES(nrf_nfct_rx_bits_get(true));

        if (NRFX_NFCT_EVT_ACTIVE(RXERROR))
        {
            nfct_evt.params.rx_frameend.rx_status = 
                (nrf_nfct_rx_frame_status_get() & NRFX_NFCT_FRAME_STATUS_RX_ALL_MASK);
            nrf_nfct_event_clear(NRF_NFCT_EVENT_RXERROR);

            NRFX_LOG_DEBUG("Rx error (0x%x)", (unsigned int) nfct_evt.params.rx_frameend.rx_status);

            /* Clear rx frame status */
            nrf_nfct_rx_frame_status_clear(NRFX_NFCT_FRAME_STATUS_RX_ALL_MASK);
        }

        NRFX_NFCT_CB_HANDLE(m_nfct_cb.config.cb, nfct_evt);

        /* Clear TXFRAMESTART EVENT so it can be checked in hal_nfc_send */
        nrf_nfct_event_clear(NRF_NFCT_EVENT_TXFRAMESTART);

        NRFX_LOG_DEBUG("Rx fend");
    }

    if (NRFX_NFCT_EVT_ACTIVE(TXFRAMEEND))
    {
        nrf_nfct_event_clear(NRF_NFCT_EVENT_TXFRAMEEND);

        nrfx_nfct_evt_t nfct_evt =
        {
            .evt_id = NRFX_NFCT_EVT_TX_FRAMEEND
        };

        /* Disable TX END event to ignore frame transmission other than READ response */
        nrf_nfct_int_disable(NRFX_NFCT_TX_INT_MASK);

        NRFX_NFCT_CB_HANDLE(m_nfct_cb.config.cb, nfct_evt);

        NRFX_LOG_DEBUG("Tx fend");
    }

    if (NRFX_NFCT_EVT_ACTIVE(SELECTED))
    {
        nrf_nfct_event_clear(NRF_NFCT_EVENT_SELECTED);
        /* Clear also RX END and RXERROR events because SW does not take care of 
           commands that were received before selecting the tag. */
        nrf_nfct_event_clear(NRF_NFCT_EVENT_RXFRAMEEND);
        nrf_nfct_event_clear(NRF_NFCT_EVENT_RXERROR);
        nrf_nfct_event_clear(NRF_NFCT_EVENT_TXFRAMESTART);
        nrf_nfct_event_clear(NRF_NFCT_EVENT_TXFRAMEEND);

        /* At this point any previous error status can be ignored. */
        nrf_nfct_rx_frame_status_clear(NRFX_NFCT_FRAME_STATUS_RX_ALL_MASK);
        nrf_nfct_error_status_clear(NRFX_NFCT_ERROR_STATUS_ALL_MASK);

        nrfx_nfct_evt_t nfct_evt =
        {
            .evt_id = NRFX_NFCT_EVT_SELECTED
        };
        NRFX_NFCT_CB_HANDLE(m_nfct_cb.config.cb, nfct_evt);

        NRFX_LOG_DEBUG("Selected");
    }

    if (NRFX_NFCT_EVT_ACTIVE(ERROR))
    {
        uint32_t err_status = nrf_nfct_error_status_get();
        nrf_nfct_event_clear(NRF_NFCT_EVENT_ERROR);

        nrfx_nfct_evt_t nfct_evt =
        {
            .evt_id = NRFX_NFCT_EVT_ERROR
        };

        /* Clear FRAMEDELAYTIMEOUT error (expected HW behaviour) when SLP_REQ command was received. */
        if (err_status & NRF_NFCT_ERROR_FRAMEDELAYTIMEOUT_MASK)
        {
            nrf_nfct_error_status_clear(NRF_NFCT_ERROR_FRAMEDELAYTIMEOUT_MASK);

            nfct_evt.params.error.reason = NRFX_NFCT_ERROR_FRAMEDELAYTIMEOUT;
            NRFX_NFCT_CB_HANDLE(m_nfct_cb.config.cb, nfct_evt);
        }

        /* Report any other error. */
        err_status &= ~NRF_NFCT_ERROR_FRAMEDELAYTIMEOUT_MASK;
        if (err_status)
        {
            NRFX_LOG_DEBUG("Error (0x%x)", (unsigned int) err_status);
        }

        /* Clear error status. */
        nrf_nfct_error_status_clear(NRFX_NFCT_ERROR_STATUS_ALL_MASK);
    }

    if (NRFX_NFCT_EVT_ACTIVE(TXFRAMESTART))
    {
        nrf_nfct_event_clear(NRF_NFCT_EVENT_TXFRAMESTART);

        if (m_nfct_cb.config.cb != NULL)
        {
            nrfx_nfct_evt_t nfct_evt;

            nfct_evt.evt_id                                 = NRFX_NFCT_EVT_TX_FRAMESTART;
            nfct_evt.params.tx_framestart.tx_data.p_data    = nrf_nfct_rxtx_buffer_get();
            nfct_evt.params.tx_framestart.tx_data.data_size = NRFX_NFCT_BITS_TO_BYTES(nrf_nfct_tx_bits_get());

            m_nfct_cb.config.cb(&nfct_evt);
        }
    }
}

#endif // NRFX_CHECK(NRFX_NFCT_ENABLED)