text: /**
   * Copyright (c) 2015 - 2017, 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.
   * 
   */
  
  /**
   * @ingroup nrf_twis
   * @defgroup nrf_twis_hal TWIS HAL
   * @{
   *
   * @brief @tagAPI52 Hardware access layer for Two Wire Interface Slave with EasyDMA
   * (TWIS) peripheral.
   */
  #ifndef NRF_TWIS_H__
  #define NRF_TWIS_H__
  
  #include "nrf.h"
  #include "sdk_config.h"
  #include <stdint.h>
  #include <stddef.h>
  #include <stdbool.h>
  
  #ifdef __cplusplus
  extern "C" {
  #endif
  
  /**
   * @brief TWIS tasks
   */
  typedef enum
  {
      /*lint -save -e30*/
      NRF_TWIS_TASK_STOP      = offsetof(NRF_TWIS_Type, TASKS_STOP),      /**< Stop TWIS transaction */
      NRF_TWIS_TASK_SUSPEND   = offsetof(NRF_TWIS_Type, TASKS_SUSPEND),   /**< Suspend TWIS transaction */
      NRF_TWIS_TASK_RESUME    = offsetof(NRF_TWIS_Type, TASKS_RESUME),    /**< Resume TWIS transaction */
      NRF_TWIS_TASK_PREPARERX = offsetof(NRF_TWIS_Type, TASKS_PREPARERX), /**< Prepare the TWIS slave to respond to a write command */
      NRF_TWIS_TASK_PREPARETX = offsetof(NRF_TWIS_Type, TASKS_PREPARETX)  /**< Prepare the TWIS slave to respond to a read command */
      /*lint -restore*/
  } nrf_twis_task_t;
  
  /**
   * @brief TWIS events
   */
  typedef enum
  {
      /*lint -save -e30*/
      NRF_TWIS_EVENT_STOPPED   = offsetof(NRF_TWIS_Type, EVENTS_STOPPED),   /**< TWIS stopped */
      NRF_TWIS_EVENT_ERROR     = offsetof(NRF_TWIS_Type, EVENTS_ERROR),     /**< TWIS error */
      NRF_TWIS_EVENT_RXSTARTED = offsetof(NRF_TWIS_Type, EVENTS_RXSTARTED), /**< Receive sequence started */
      NRF_TWIS_EVENT_TXSTARTED = offsetof(NRF_TWIS_Type, EVENTS_TXSTARTED), /**< Transmit sequence started */
      NRF_TWIS_EVENT_WRITE     = offsetof(NRF_TWIS_Type, EVENTS_WRITE),     /**< Write command received */
      NRF_TWIS_EVENT_READ      = offsetof(NRF_TWIS_Type, EVENTS_READ)       /**< Read command received */
      /*lint -restore*/
  } nrf_twis_event_t;
  
  /**
   * @brief TWIS shortcuts
   */
  typedef enum
  {
      NRF_TWIS_SHORT_WRITE_SUSPEND_MASK   = TWIS_SHORTS_WRITE_SUSPEND_Msk,   /**< Shortcut between WRITE event and SUSPEND task */
      NRF_TWIS_SHORT_READ_SUSPEND_MASK    = TWIS_SHORTS_READ_SUSPEND_Msk,    /**< Shortcut between READ event and SUSPEND task */
  } nrf_twis_short_mask_t;
  
  /**
   * @brief TWIS interrupts
   */
  typedef enum
  {
      NRF_TWIS_INT_STOPPED_MASK   = TWIS_INTEN_STOPPED_Msk,   /**< Interrupt on STOPPED event */
      NRF_TWIS_INT_ERROR_MASK     = TWIS_INTEN_ERROR_Msk,     /**< Interrupt on ERROR event */
      NRF_TWIS_INT_RXSTARTED_MASK = TWIS_INTEN_RXSTARTED_Msk, /**< Interrupt on RXSTARTED event */
      NRF_TWIS_INT_TXSTARTED_MASK = TWIS_INTEN_TXSTARTED_Msk, /**< Interrupt on TXSTARTED event */
      NRF_TWIS_INT_WRITE_MASK     = TWIS_INTEN_WRITE_Msk,     /**< Interrupt on WRITE event */
      NRF_TWIS_INT_READ_MASK      = TWIS_INTEN_READ_Msk,      /**< Interrupt on READ event */
  } nrf_twis_int_mask_t;
  
  /**
   * @brief TWIS error source
   */
  typedef enum
  {
      NRF_TWIS_ERROR_OVERFLOW  = TWIS_ERRORSRC_OVERFLOW_Msk, /**< RX buffer overflow detected, and prevented */
      NRF_TWIS_ERROR_DATA_NACK = TWIS_ERRORSRC_DNACK_Msk,    /**< NACK sent after receiving a data byte */
      NRF_TWIS_ERROR_OVERREAD  = TWIS_ERRORSRC_OVERREAD_Msk  /**< TX buffer over-read detected, and prevented */
  } nrf_twis_error_t;
  
  /**
   * @brief TWIS address matching configuration
   */
  typedef enum
  {
      NRF_TWIS_CONFIG_ADDRESS0_MASK  = TWIS_CONFIG_ADDRESS0_Msk, /**< Enable or disable address matching on ADDRESS[0] */
      NRF_TWIS_CONFIG_ADDRESS1_MASK  = TWIS_CONFIG_ADDRESS1_Msk, /**< Enable or disable address matching on ADDRESS[1] */
      NRF_TWIS_CONFIG_ADDRESS01_MASK = TWIS_CONFIG_ADDRESS0_Msk | TWIS_CONFIG_ADDRESS1_Msk /**< Enable both address matching */
  } nrf_twis_config_addr_mask_t;
  
  /**
   * @brief Variable type to hold amount of data for EasyDMA
   *
   * Variable of the minimum size that can hold the amount of data to transfer.
   *
   * @note
   * Defined to make it simple to change if EasyDMA would be updated to support more data in
   * the future devices to.
   */
  typedef uint8_t nrf_twis_amount_t;
  
  /**
   * @brief Smallest variable type to hold TWI address
   *
   * Variable of the minimum size that can hold single TWI address.
   *
   * @note
   * Defined to make it simple to change if new TWI would support for example
   * 10 bit addressing mode.
   */
  typedef uint8_t nrf_twis_address_t;
  
  
  /**
   * @brief Function for activating a specific TWIS task.
   *
   * @param[in] p_reg Pointer to the peripheral registers structure.
   * @param     task   Task.
   */
  __STATIC_INLINE void nrf_twis_task_trigger(NRF_TWIS_Type * const p_reg, nrf_twis_task_t task);
  
  /**
   * @brief Function for returning the address of a specific TWIS task register.
   *
   * @param[in]  p_reg Pointer to the peripheral registers structure.
   * @param      task   Task.
   *
   * @return Task address.
   */
  __STATIC_INLINE uint32_t nrf_twis_task_address_get(
          NRF_TWIS_Type const * const p_reg,
          nrf_twis_task_t      task);
  
  /**
   * @brief Function for clearing a specific event.
   *
   * @param[in] p_reg Pointer to the peripheral registers structure.
   * @param     event  Event.
   */
  __STATIC_INLINE void nrf_twis_event_clear(
          NRF_TWIS_Type     * const p_reg,
          nrf_twis_event_t   event);
  /**
   * @brief Function for returning the state of a specific event.
   *
   * @param[in] p_reg Pointer to the peripheral registers structure.
   * @param     event  Event.
   *
   * @retval true If the event is set.
   * @retval false If the event is not set.
   */
  __STATIC_INLINE bool nrf_twis_event_check(
          NRF_TWIS_Type const * const p_reg,
          nrf_twis_event_t     event);
  
  
  /**
   * @brief Function for getting and clearing the state of specific event
   *
   * This function checks the state of the event and clears it.
   * @param[in,out] p_reg Pointer to the peripheral registers structure.
   * @param         event Event.
   *
   * @retval true If the event was set.
   * @retval false If the event was not set.
   */
  __STATIC_INLINE bool nrf_twis_event_get_and_clear(
          NRF_TWIS_Type    * const p_reg,
          nrf_twis_event_t   event);
  
  
  /**
   * @brief Function for returning the address of a specific TWIS event register.
   *
   * @param[in] p_reg Pointer to the peripheral registers structure.
   * @param     event  Event.
   *
   * @return Address.
   */
  __STATIC_INLINE uint32_t nrf_twis_event_address_get(
          NRF_TWIS_Type const * const p_reg,
          nrf_twis_event_t     event);
  
  /**
   * @brief Function for setting a shortcut.
   *
   * @param[in] p_reg     Pointer to the peripheral registers structure.
   * @param     short_mask Shortcuts mask.
   */
  __STATIC_INLINE void nrf_twis_shorts_enable(NRF_TWIS_Type * const p_reg, uint32_t short_mask);
  
  /**
   * @brief Function for clearing shortcuts.
   *
   * @param[in] p_reg     Pointer to the peripheral registers structure.
   * @param     short_mask Shortcuts mask.
   */
  __STATIC_INLINE void nrf_twis_shorts_disable(NRF_TWIS_Type * const p_reg, uint32_t short_mask);
  
  /**
   * @brief Get the shorts mask
   *
   * Function returns shorts register.
   * @param[in] p_reg     Pointer to the peripheral registers structure.
   * @return Flags of currently enabled shortcuts
   */
  __STATIC_INLINE uint32_t nrf_twis_shorts_get(NRF_TWIS_Type * const p_reg);
  
  /**
   * @brief Function for enabling selected interrupts.
   *
   * @param[in] p_reg   Pointer to the peripheral registers structure.
   * @param     int_mask Interrupts mask.
   */
  __STATIC_INLINE void nrf_twis_int_enable(NRF_TWIS_Type * const p_reg, uint32_t int_mask);
  
  /**
   * @brief Function for retrieving the state of selected interrupts.
   *
   * @param[in] p_reg   Pointer to the peripheral registers structure.
   * @param     int_mask Interrupts mask.
   *
   * @retval true If any of selected interrupts is enabled.
   * @retval false If none of selected interrupts is enabled.
   */
  __STATIC_INLINE bool nrf_twis_int_enable_check(NRF_TWIS_Type const * const p_reg, uint32_t int_mask);
  
  /**
   * @brief Function for disabling selected interrupts.
   *
   * @param[in] p_reg   Pointer to the peripheral registers structure.
   * @param     int_mask Interrupts mask.
   */
  __STATIC_INLINE void nrf_twis_int_disable(NRF_TWIS_Type * const p_reg, uint32_t int_mask);
  
  /**
   * @brief Function for retrieving and clearing the TWIS error source.
   *
   * @attention Error sources are cleared after read.
   * @param[in] p_reg Pointer to the peripheral registers structure.
   * @return Error source mask with values from @ref nrf_twis_error_t.
   */
  __STATIC_INLINE uint32_t nrf_twis_error_source_get_and_clear(NRF_TWIS_Type * const p_reg);
  
  /**
   * @brief Get information which of addresses matched
   *
   * Function returns index in the address table
   * that points to the address that already matched.
   * @param[in] p_reg Pointer to the peripheral registers structure.
   * @return Index of matched address
   */
  __STATIC_INLINE uint_fast8_t nrf_twis_match_get(NRF_TWIS_Type const * p_reg);
  
  /**
   * @brief Function for enabling TWIS.
   *
   * @param[in] p_reg Pointer to the peripheral registers structure.
   */
  __STATIC_INLINE void nrf_twis_enable(NRF_TWIS_Type * const p_reg);
  
  /**
   * @brief Function for disabling TWIS.
   *
   * @param[in] p_reg Pointer to the peripheral registers structure.
   */
  __STATIC_INLINE void nrf_twis_disable(NRF_TWIS_Type * const p_reg);
  
  /**
   * @brief Function for configuring TWIS pins.
   *
   * @param[in] p_reg Pointer to the peripheral registers structure.
   * @param scl SCL pin number.
   * @param sda SDA pin number.
   */
  __STATIC_INLINE void nrf_twis_pins_set(NRF_TWIS_Type * const p_reg, uint32_t scl, uint32_t sda);
  
  /**
   * @brief Function for setting the receive buffer.
   *
   * @param[in] p_reg Pointer to the peripheral registers structure.
   * @param     p_buf  Pointer to the buffer for received data.
   * @param     length Maximum number of data bytes to receive.
   */
  __STATIC_INLINE void nrf_twis_rx_buffer_set(
          NRF_TWIS_Type     * const p_reg,
          uint8_t           * p_buf,
          nrf_twis_amount_t   length);
  
  /**
   * @brief Function that prepares TWIS for receiving
   *
   * This function sets receive buffer and then sets NRF_TWIS_TASK_PREPARERX task.
   * @param[in] p_reg Pointer to the peripheral registers structure.
   * @param     p_buf  Pointer to the buffer for received data.
   * @param     length Maximum number of data bytes to receive.
   */
  __STATIC_INLINE void nrf_twis_rx_prepare(
          NRF_TWIS_Type     * const p_reg,
          uint8_t           * p_buf,
          nrf_twis_amount_t   length);
  
  /**
   * @brief Function for getting number of bytes received in the last transaction.
   *
   * @param[in] p_reg TWIS instance.
   * @return Amount of bytes received.
   * */
  __STATIC_INLINE nrf_twis_amount_t nrf_twis_rx_amount_get(NRF_TWIS_Type const * const p_reg);
  
  /**
   * @brief Function for setting the transmit buffer.
   *
   * @param[in] p_reg Pointer to the peripheral registers structure.
   * @param     p_buf  Pointer to the buffer with data to send.
   * @param     length Maximum number of data bytes to transmit.
   */
  __STATIC_INLINE void nrf_twis_tx_buffer_set(
          NRF_TWIS_Type     * const p_reg,
          uint8_t const     * p_buf,
          nrf_twis_amount_t   length);
  
  /**
   * @brief Function that prepares TWIS for transmitting
   *
   * This function sets transmit buffer and then sets NRF_TWIS_TASK_PREPARETX task.
   * @param[in] p_reg Pointer to the peripheral registers structure.
   * @param     p_buf  Pointer to the buffer with data to send.
   * @param     length Maximum number of data bytes to transmit.
   */
  __STATIC_INLINE void nrf_twis_tx_prepare(
          NRF_TWIS_Type     * const p_reg,
          uint8_t const     * p_buf,
          nrf_twis_amount_t   length);
  
  /**
   * @brief Function for getting number of bytes transmitted in the last transaction.
   *
   * @param[in] p_reg Pointer to the peripheral registers structure.
   * @return Amount of bytes transmitted.
   */
  __STATIC_INLINE nrf_twis_amount_t nrf_twis_tx_amount_get(NRF_TWIS_Type const * const p_reg);
  
  /**
   * @brief Function for setting slave address
   *
   * Function sets the selected address for this TWI interface.
   * @param[in] p_reg Pointer to the peripheral registers structure.
   * @param     n Index of address to set
   * @param     addr Addres to set
   * @sa nrf_twis_config_address_set
   * @sa nrf_twis_config_address_get
   */
  __STATIC_INLINE void nrf_twis_address_set(
          NRF_TWIS_Type      * const p_reg,
          uint_fast8_t         n,
          nrf_twis_address_t   addr);
  
  /**
   * @brief Function for retrieving configured slave address
   *
   * Function gets the selected address for this TWI interface.
   * @param[in] p_reg Pointer to the peripheral registers structure.
   * @param n   Index of address to get
   */
  __STATIC_INLINE nrf_twis_address_t nrf_twis_address_get(
          NRF_TWIS_Type const * const p_reg,
          uint_fast8_t          n);
  
  /**
   * @brief Function for setting the device address configuration.
   *
   * @param[in] p_reg    Pointer to the peripheral registers structure.
   * @param     addr_mask Mask of address indexes of what device should answer to.
   *
   * @sa nrf_twis_address_set
   */
  __STATIC_INLINE void nrf_twis_config_address_set(
          NRF_TWIS_Type              * const p_reg,
          nrf_twis_config_addr_mask_t        addr_mask);
  
  /**
   * @brief Function for retrieving the device address configuration.
   *
   * @param[in] p_reg Pointer to the peripheral registers structure.
   *
   * @return Mask of address indexes of what device should answer to.
   */
  __STATIC_INLINE nrf_twis_config_addr_mask_t nrf_twis_config_address_get(
          NRF_TWIS_Type const * const p_reg);
  
  /**
   * @brief Function for setting the over-read character.
   *
   * @param[in] p_reg    Pointer to the peripheral registers structure.
   * @param[in] orc       Over-read character. Character clocked out in case of
   *                      over-read of the TXD buffer.
   */
  __STATIC_INLINE void nrf_twis_orc_set(
          NRF_TWIS_Type * const p_reg,
          uint8_t         orc);
  
  /**
   * @brief Function for setting the over-read character.
   *
   * @param[in] p_reg Pointer to the peripheral registers structure.
   *
   * @return Over-read character configured for selected instance.
   */
  __STATIC_INLINE uint8_t nrf_twis_orc_get(NRF_TWIS_Type const * const p_reg);
  
  
  /** @} */ /*  End of nrf_twis_hal */
  
  #ifndef SUPPRESS_INLINE_IMPLEMENTATION
  
  /* ------------------------------------------------------------------------------------------------
   *  Internal functions
   */
  
  /**
   * @internal
   * @brief Internal function for getting task/event register address
   *
   * @param[in] p_reg Pointer to the peripheral registers structure.
   * @oaram     offset Offset of the register from the instance beginning
   *
   * @attention offset has to be modulo 4 value. In other case we can get hardware fault.
   * @return Pointer to the register
   */
  __STATIC_INLINE volatile uint32_t* nrf_twis_getRegPtr(NRF_TWIS_Type * const p_reg, uint32_t offset)
  {
      return (volatile uint32_t*)((uint8_t *)p_reg + (uint32_t)offset);
  }
  
  /**
   * @internal
   * @brief Internal function for getting task/event register address - constant version
   *
   * @param[in] p_reg Pointer to the peripheral registers structure.
   * @oaram     offset Offset of the register from the instance beginning
   *
   * @attention offset has to be modulo 4 value. In other case we can get hardware fault.
   * @return Pointer to the register
   */
  __STATIC_INLINE volatile const uint32_t* nrf_twis_getRegPtr_c(NRF_TWIS_Type const * const p_reg, uint32_t offset)
  {
      return (volatile const uint32_t*)((uint8_t *)p_reg + (uint32_t)offset);
  }
  
  
  /* ------------------------------------------------------------------------------------------------
   *  Interface functions definitions
   */
  
  
  void nrf_twis_task_trigger(NRF_TWIS_Type * const p_reg, nrf_twis_task_t task)
  {
      *(nrf_twis_getRegPtr(p_reg, (uint32_t)task)) = 1UL;
  }
  
  uint32_t nrf_twis_task_address_get(
          NRF_TWIS_Type const * const p_reg,
          nrf_twis_task_t       task)
  {
      return (uint32_t)nrf_twis_getRegPtr_c(p_reg, (uint32_t)task);
  }
  
  void nrf_twis_event_clear(
          NRF_TWIS_Type     * const p_reg,
          nrf_twis_event_t    event)
  {
      *(nrf_twis_getRegPtr(p_reg, (uint32_t)event)) = 0UL;
  #if __CORTEX_M == 0x04
      volatile uint32_t dummy = *((volatile uint32_t *)((uint8_t *)p_reg + (uint32_t)event));
      (void)dummy;
  #endif
  }
  
  bool nrf_twis_event_check(
          NRF_TWIS_Type const * const p_reg,
          nrf_twis_event_t      event)
  {
      return (bool)*nrf_twis_getRegPtr_c(p_reg, (uint32_t)event);
  }
  
  bool nrf_twis_event_get_and_clear(
          NRF_TWIS_Type    * const p_reg,
          nrf_twis_event_t   event)
  {
      bool ret = nrf_twis_event_check(p_reg, event);
      if (ret)
      {
          nrf_twis_event_clear(p_reg, event);
      }
      return ret;
  }
  
  uint32_t nrf_twis_event_address_get(
          NRF_TWIS_Type const * const p_reg,
          nrf_twis_event_t      event)
  {
      return (uint32_t)nrf_twis_getRegPtr_c(p_reg, (uint32_t)event);
  }
  
  void nrf_twis_shorts_enable(NRF_TWIS_Type * const p_reg, uint32_t short_mask)
  {
      p_reg->SHORTS |= short_mask;
  }
  
  void nrf_twis_shorts_disable(NRF_TWIS_Type * const p_reg, uint32_t short_mask)
  {
      if (~0U == short_mask)
      {
          /* Optimized version for "disable all" */
          p_reg->SHORTS = 0;
      }
      else
      {
          p_reg->SHORTS &= ~short_mask;
      }
  }
  
  uint32_t nrf_twis_shorts_get(NRF_TWIS_Type * const p_reg)
  {
      return p_reg->SHORTS;
  }
  
  void nrf_twis_int_enable(NRF_TWIS_Type * const p_reg, uint32_t int_mask)
  {
      p_reg->INTENSET = int_mask;
  }
  
  bool nrf_twis_int_enable_check(NRF_TWIS_Type const * const p_reg, uint32_t int_mask)
  {
      return (bool)(p_reg->INTENSET & int_mask);
  }
  
  void nrf_twis_int_disable(NRF_TWIS_Type * const p_reg, uint32_t int_mask)
  {
      p_reg->INTENCLR = int_mask;
  }
  
  uint32_t nrf_twis_error_source_get_and_clear(NRF_TWIS_Type * const p_reg)
  {
      uint32_t ret = p_reg->ERRORSRC;
      p_reg->ERRORSRC = ret;
      return ret;
  }
  
  uint_fast8_t nrf_twis_match_get(NRF_TWIS_Type const * p_reg)
  {
      return (uint_fast8_t)p_reg->MATCH;
  }
  
  void nrf_twis_enable(NRF_TWIS_Type * const p_reg)
  {
      p_reg->ENABLE = (TWIS_ENABLE_ENABLE_Enabled << TWIS_ENABLE_ENABLE_Pos);
  }
  
  void nrf_twis_disable(NRF_TWIS_Type * const p_reg)
  {
      p_reg->ENABLE = (TWIS_ENABLE_ENABLE_Disabled << TWIS_ENABLE_ENABLE_Pos);
  }
  
  void nrf_twis_pins_set(NRF_TWIS_Type * const p_reg, uint32_t scl, uint32_t sda)
  {
      p_reg->PSEL.SCL = scl;
      p_reg->PSEL.SDA = sda;
  }
  
  void nrf_twis_rx_buffer_set(
          NRF_TWIS_Type     * const p_reg,
          uint8_t           * p_buf,
          nrf_twis_amount_t   length)
  {
      p_reg->RXD.PTR    = (uint32_t)p_buf;
      p_reg->RXD.MAXCNT = length;
  }
  
  __STATIC_INLINE void nrf_twis_rx_prepare(
          NRF_TWIS_Type     * const p_reg,
          uint8_t           * p_buf,
          nrf_twis_amount_t   length)
  {
      nrf_twis_rx_buffer_set(p_reg, p_buf, length);
      nrf_twis_task_trigger(p_reg, NRF_TWIS_TASK_PREPARERX);
  }
  
  nrf_twis_amount_t nrf_twis_rx_amount_get(NRF_TWIS_Type const * const p_reg)
  {
      return (nrf_twis_amount_t)p_reg->RXD.AMOUNT;
  }
  
  void nrf_twis_tx_buffer_set(
          NRF_TWIS_Type     * const p_reg,
          uint8_t const     * p_buf,
          nrf_twis_amount_t   length)
  {
      p_reg->TXD.PTR    = (uint32_t)p_buf;
      p_reg->TXD.MAXCNT = length;
  }
  
  __STATIC_INLINE void nrf_twis_tx_prepare(
          NRF_TWIS_Type     * const p_reg,
          uint8_t const     * p_buf,
          nrf_twis_amount_t   length)
  {
      nrf_twis_tx_buffer_set(p_reg, p_buf, length);
      nrf_twis_task_trigger(p_reg, NRF_TWIS_TASK_PREPARETX);
  }
  
  nrf_twis_amount_t nrf_twis_tx_amount_get(NRF_TWIS_Type const * const p_reg)
  {
      return (nrf_twis_amount_t)p_reg->TXD.AMOUNT;
  }
  
  void nrf_twis_address_set(
          NRF_TWIS_Type      * const p_reg,
          uint_fast8_t         n,
          nrf_twis_address_t   addr)
  {
      p_reg->ADDRESS[n] = addr;
  }
  
  nrf_twis_address_t nrf_twis_address_get(
          NRF_TWIS_Type const * const p_reg,
          uint_fast8_t          n)
  {
      return (nrf_twis_address_t)p_reg->ADDRESS[n];
  }
  void nrf_twis_config_address_set(
          NRF_TWIS_Type              * const p_reg,
          nrf_twis_config_addr_mask_t        addr_mask)
  {
      /* This is the only configuration in TWIS - just write it without masking */
      p_reg->CONFIG = addr_mask;
  }
  
  nrf_twis_config_addr_mask_t nrf_twis_config_address_get(NRF_TWIS_Type const * const p_reg)
  {
      return (nrf_twis_config_addr_mask_t)(p_reg->CONFIG & TWIS_ADDRESS_ADDRESS_Msk);
  }
  
  void nrf_twis_orc_set(
          NRF_TWIS_Type * const p_reg,
          uint8_t         orc)
  {
      p_reg->ORC = orc;
  }
  
  uint8_t nrf_twis_orc_get(NRF_TWIS_Type const * const p_reg)
  {
      return (uint8_t)p_reg->ORC;
  }
  
  #endif /* SUPPRESS_INLINE_IMPLEMENTATION */
  
  
  #ifdef __cplusplus
  }
  #endif
  
  #endif /* NRF_TWIS_H__ */
  
  