text: /* 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.
   *
   */
  
  /**
   * @defgroup nrf_spim_hal SPIM HAL
   * @{
   * @ingroup nrf_spi_master
   *
   * @brief Hardware access layer for accessing the SPIM peripheral.
   */
  
  #ifndef NRF_SPIM_H__
  #define NRF_SPIM_H__
  
  #include <stddef.h>
  #include <stdbool.h>
  #include <stdint.h>
  
  #include "nrf.h"
  
  
  /**
   * @brief This value can be used as a parameter for the @ref nrf_spim_pins_set
   *        function to specify that a given SPI signal (SCK, MOSI, or MISO)
   *        shall not be connected to a physical pin.
   */
  #define NRF_SPIM_PIN_NOT_CONNECTED  0xFFFFFFFF
  
  
  /**
   * @brief SPIM tasks.
   */
  typedef enum
  {
      /*lint -save -e30*/
      NRF_SPIM_TASK_START   = offsetof(NRF_SPIM_Type, TASKS_START),   ///< Start SPI transaction.
      NRF_SPIM_TASK_STOP    = offsetof(NRF_SPIM_Type, TASKS_STOP),    ///< Stop SPI transaction.
      NRF_SPIM_TASK_SUSPEND = offsetof(NRF_SPIM_Type, TASKS_SUSPEND), ///< Suspend SPI transaction.
      NRF_SPIM_TASK_RESUME  = offsetof(NRF_SPIM_Type, TASKS_RESUME)   ///< Resume SPI transaction.
      /*lint -restore*/
  } nrf_spim_task_t;
  
  /**
   * @brief SPIM events.
   */
  typedef enum
  {
      /*lint -save -e30*/
      NRF_SPIM_EVENT_STOPPED = offsetof(NRF_SPIM_Type, EVENTS_STOPPED), ///< SPI transaction has stopped.
      NRF_SPIM_EVENT_ENDRX   = offsetof(NRF_SPIM_Type, EVENTS_ENDRX),   ///< End of RXD buffer reached.
  #ifdef NRF52
      NRF_SPIM_EVENT_END     = offsetof(NRF_SPIM_Type, EVENTS_END),     ///< End of RXD buffer and TXD buffer reached.
  #endif
      NRF_SPIM_EVENT_ENDTX   = offsetof(NRF_SPIM_Type, EVENTS_ENDTX),   ///< End of TXD buffer reached.
      NRF_SPIM_EVENT_STARTED = offsetof(NRF_SPIM_Type, EVENTS_STARTED)  ///< Transaction started.
      /*lint -restore*/
  } nrf_spim_event_t;
  
  #ifdef NRF52
  /**
   * @brief SPIM shortcuts.
   */
  typedef enum
  {
      NRF_SPIM_SHORT_END_START_MASK = SPIM_SHORTS_END_START_Msk ///< Shortcut between END event and START task.
  } nrf_spim_short_mask_t;
  #endif
  
  /**
   * @brief SPIM interrupts.
   */
  typedef enum
  {
      NRF_SPIM_INT_STOPPED_MASK = SPIM_INTENSET_STOPPED_Msk, ///< Interrupt on STOPPED event.
      NRF_SPIM_INT_ENDRX_MASK   = SPIM_INTENSET_ENDRX_Msk,   ///< Interrupt on ENDRX event.
  #ifdef NRF52
      NRF_SPIM_INT_END_MASK     = SPIM_INTENSET_END_Msk,     ///< Interrupt on END event.
  #endif
      NRF_SPIM_INT_ENDTX_MASK   = SPIM_INTENSET_ENDTX_Msk,   ///< Interrupt on ENDTX event.
      NRF_SPIM_INT_STARTED_MASK = SPIM_INTENSET_STARTED_Msk  ///< Interrupt on STARTED event.
  } nrf_spim_int_mask_t;
  
  /**
   * @brief SPI master data rates.
   */
  typedef enum
  {
      NRF_SPIM_FREQ_125K = SPIM_FREQUENCY_FREQUENCY_K125,   ///< 125 kbps.
      NRF_SPIM_FREQ_250K = SPIM_FREQUENCY_FREQUENCY_K250,   ///< 250 kbps.
      NRF_SPIM_FREQ_500K = SPIM_FREQUENCY_FREQUENCY_K500,   ///< 500 kbps.
      NRF_SPIM_FREQ_1M   = SPIM_FREQUENCY_FREQUENCY_M1,     ///< 1 Mbps.
      NRF_SPIM_FREQ_2M   = SPIM_FREQUENCY_FREQUENCY_M2,     ///< 2 Mbps.
      NRF_SPIM_FREQ_4M   = SPIM_FREQUENCY_FREQUENCY_M4,     ///< 4 Mbps.
      // [conversion to 'int' needed to prevent compilers from complaining
      //  that the provided value (0x80000000UL) is out of range of "int"]
      NRF_SPIM_FREQ_8M   = (int)SPIM_FREQUENCY_FREQUENCY_M8 ///< 8 Mbps.
  } nrf_spim_frequency_t;
  
  /**
   * @brief SPI modes.
   */
  typedef enum
  {
      NRF_SPIM_MODE_0, ///< SCK active high, sample on leading edge of clock.
      NRF_SPIM_MODE_1, ///< SCK active high, sample on trailing edge of clock.
      NRF_SPIM_MODE_2, ///< SCK active low, sample on leading edge of clock.
      NRF_SPIM_MODE_3  ///< SCK active low, sample on trailing edge of clock.
  } nrf_spim_mode_t;
  
  /**
   * @brief SPI bit orders.
   */
  typedef enum
  {
      NRF_SPIM_BIT_ORDER_MSB_FIRST = SPIM_CONFIG_ORDER_MsbFirst, ///< Most significant bit shifted out first.
      NRF_SPIM_BIT_ORDER_LSB_FIRST = SPIM_CONFIG_ORDER_LsbFirst  ///< Least significant bit shifted out first.
  } nrf_spim_bit_order_t;
  
  
  /**
   * @brief Function for activating a specific SPIM task.
   *
   * @param[in] p_spim    SPIM instance.
   * @param[in] spim_task Task to activate.
   */
  __STATIC_INLINE void nrf_spim_task_trigger(NRF_SPIM_Type * p_spim,
                                             nrf_spim_task_t spim_task);
  
  /**
   * @brief Function for getting the address of a specific SPIM task register.
   *
   * @param[in] p_spim    SPIM instance.
   * @param[in] spim_task Requested task.
   *
   * @return Address of the specified task register.
   */
  __STATIC_INLINE uint32_t * nrf_spim_task_address_get(NRF_SPIM_Type * p_spim,
                                                       nrf_spim_task_t spim_task);
  
  /**
   * @brief Function for clearing a specific SPIM event.
   *
   * @param[in] p_spim     SPIM instance.
   * @param[in] spim_event Event to clear.
   */
  __STATIC_INLINE void nrf_spim_event_clear(NRF_SPIM_Type * p_spim,
                                            nrf_spim_event_t spim_event);
  
  /**
   * @brief Function for checking the state of a specific SPIM event.
   *
   * @param[in] p_spim     SPIM instance.
   * @param[in] spim_event Event to check.
   *
   * @retval true  If the event is set.
   * @retval false If the event is not set.
   */
  __STATIC_INLINE bool nrf_spim_event_check(NRF_SPIM_Type * p_spim,
                                            nrf_spim_event_t spim_event);
  
  /**
   * @brief Function for getting the address of a specific SPIM event register.
   *
   * @param[in] p_spim     SPIM instance.
   * @param[in] spim_event Requested event.
   *
   * @return Address of the specified event register.
   */
  __STATIC_INLINE uint32_t * nrf_spim_event_address_get(NRF_SPIM_Type  * p_spim,
                                                        nrf_spim_event_t spim_event);
  #ifdef NRF52
  /**
   * @brief Function for enabling specified shortcuts.
   *
   * @param[in] p_spim           SPIM instance.
   * @param[in] spim_shorts_mask Shortcuts to enable.
   */
  __STATIC_INLINE void nrf_spim_shorts_enable(NRF_SPIM_Type * p_spim,
                                              uint32_t spim_shorts_mask);
  
  /**
   * @brief Function for disabling specified shortcuts.
   *
   * @param[in] p_spim           SPIM instance.
   * @param[in] spim_shorts_mask Shortcuts to disable.
   */
  __STATIC_INLINE void nrf_spim_shorts_disable(NRF_SPIM_Type * p_spim,
                                               uint32_t spim_shorts_mask);
  #endif
  /**
   * @brief Function for enabling specified interrupts.
   *
   * @param[in] p_spim        SPIM instance.
   * @param[in] spim_int_mask Interrupts to enable.
   */
  __STATIC_INLINE void nrf_spim_int_enable(NRF_SPIM_Type * p_spim,
                                           uint32_t spim_int_mask);
  
  /**
   * @brief Function for disabling specified interrupts.
   *
   * @param[in] p_spim        SPIM instance.
   * @param[in] spim_int_mask Interrupts to disable.
   */
  __STATIC_INLINE void nrf_spim_int_disable(NRF_SPIM_Type * p_spim,
                                            uint32_t spim_int_mask);
  
  /**
   * @brief Function for retrieving the state of a given interrupt.
   *
   * @param[in] p_spim   SPIM instance.
   * @param[in] spim_int Interrupt to check.
   *
   * @retval true  If the interrupt is enabled.
   * @retval false If the interrupt is not enabled.
   */
  __STATIC_INLINE bool nrf_spim_int_enable_check(NRF_SPIM_Type * p_spim,
                                                 nrf_spim_int_mask_t spim_int);
  
  /**
   * @brief Function for enabling the SPIM peripheral.
   *
   * @param[in] p_spim SPIM instance.
   */
  __STATIC_INLINE void nrf_spim_enable(NRF_SPIM_Type * p_spim);
  
  /**
   * @brief Function for disabling the SPIM peripheral.
   *
   * @param[in] p_spim SPIM instance.
   */
  __STATIC_INLINE void nrf_spim_disable(NRF_SPIM_Type * p_spim);
  
  /**
   * @brief Function for configuring SPIM pins.
   *
   * If a given signal is not needed, pass the @ref NRF_SPIM_PIN_NOT_CONNECTED
   * value instead of its pin number.
   *
   * @param[in] p_spim    SPIM instance.
   * @param[in] sck_pin   SCK pin number.
   * @param[in] mosi_pin  MOSI pin number.
   * @param[in] miso_pin  MISO pin number.
   */
  __STATIC_INLINE void nrf_spim_pins_set(NRF_SPIM_Type * p_spim,
                                         uint32_t sck_pin,
                                         uint32_t mosi_pin,
                                         uint32_t miso_pin);
  
  /**
   * @brief Function for setting the SPI master data rate.
   *
   * @param[in] p_spim    SPIM instance.
   * @param[in] frequency SPI frequency.
   */
  __STATIC_INLINE void nrf_spim_frequency_set(NRF_SPIM_Type * p_spim,
                                              nrf_spim_frequency_t frequency);
  
  /**
   * @brief Function for setting the transmit buffer.
   *
   * @param[in]  p_spim   SPIM instance.
   * @param[in]  p_buffer Pointer to the buffer with data to send.
   * @param[in]  length   Maximum number of data bytes to transmit.
   */
  __STATIC_INLINE void nrf_spim_tx_buffer_set(NRF_SPIM_Type * p_spim,
                                              uint8_t const * p_buffer,
                                              uint8_t         length);
  
  /**
   * @brief Function for setting the receive buffer.
   *
   * @param[in] p_spim   SPIM instance.
   * @param[in] p_buffer Pointer to the buffer for received data.
   * @param[in] length   Maximum number of data bytes to receive.
   */
  __STATIC_INLINE void nrf_spim_rx_buffer_set(NRF_SPIM_Type * p_spim,
                                              uint8_t * p_buffer,
                                              uint8_t   length);
  
  /**
   * @brief Function for setting the SPI configuration.
   *
   * @param[in] p_spim        SPIM instance.
   * @param[in] spi_mode      SPI mode.
   * @param[in] spi_bit_order SPI bit order.
   */
  __STATIC_INLINE void nrf_spim_configure(NRF_SPIM_Type * p_spim,
                                          nrf_spim_mode_t spi_mode,
                                          nrf_spim_bit_order_t spi_bit_order);
  
  /**
   * @brief Function for setting the over-read character.
   *
   * @param[in] p_spim SPIM instance.
   * @param[in] orc    Over-read character that is clocked out in case of
   *                   an over-read of the TXD buffer.
   */
  __STATIC_INLINE void nrf_spim_orc_set(NRF_SPIM_Type * p_spim,
                                        uint8_t orc);
  
  
  #ifndef SUPPRESS_INLINE_IMPLEMENTATION
  
  __STATIC_INLINE void nrf_spim_task_trigger(NRF_SPIM_Type * p_spim,
                                             nrf_spim_task_t spim_task)
  {
      *((volatile uint32_t *)((uint8_t *)p_spim + (uint32_t)spim_task)) = 0x1UL;
  }
  
  __STATIC_INLINE uint32_t * nrf_spim_task_address_get(NRF_SPIM_Type * p_spim,
                                                       nrf_spim_task_t spim_task)
  {
      return (uint32_t *)((uint8_t *)p_spim + (uint32_t)spim_task);
  }
  
  __STATIC_INLINE void nrf_spim_event_clear(NRF_SPIM_Type * p_spim,
                                            nrf_spim_event_t spim_event)
  {
      *((volatile uint32_t *)((uint8_t *)p_spim + (uint32_t)spim_event)) = 0x0UL;
  }
  
  __STATIC_INLINE bool nrf_spim_event_check(NRF_SPIM_Type * p_spim,
                                            nrf_spim_event_t spim_event)
  {
      return (bool)*(volatile uint32_t *)((uint8_t *)p_spim + (uint32_t)spim_event);
  }
  
  __STATIC_INLINE uint32_t * nrf_spim_event_address_get(NRF_SPIM_Type * p_spim,
                                                        nrf_spim_event_t spim_event)
  {
      return (uint32_t *)((uint8_t *)p_spim + (uint32_t)spim_event);
  }
  
  #ifdef NRF52
  __STATIC_INLINE void nrf_spim_shorts_enable(NRF_SPIM_Type * p_spim,
                                              uint32_t spim_shorts_mask)
  {
      p_spim->SHORTS |= spim_shorts_mask;
  }
  
  __STATIC_INLINE void nrf_spim_shorts_disable(NRF_SPIM_Type * p_spim,
                                               uint32_t spim_shorts_mask)
  {
      p_spim->SHORTS &= ~(spim_shorts_mask);
  }
  #endif
  __STATIC_INLINE void nrf_spim_int_enable(NRF_SPIM_Type * p_spim,
                                           uint32_t spim_int_mask)
  {
      p_spim->INTENSET = spim_int_mask;
  }
  
  __STATIC_INLINE void nrf_spim_int_disable(NRF_SPIM_Type * p_spim,
                                            uint32_t spim_int_mask)
  {
      p_spim->INTENCLR = spim_int_mask;
  }
  
  __STATIC_INLINE bool nrf_spim_int_enable_check(NRF_SPIM_Type * p_spim,
                                                 nrf_spim_int_mask_t spim_int)
  {
      return (bool)(p_spim->INTENSET & spim_int);
  }
  
  __STATIC_INLINE void nrf_spim_enable(NRF_SPIM_Type * p_spim)
  {
      p_spim->ENABLE = (SPIM_ENABLE_ENABLE_Enabled << SPIM_ENABLE_ENABLE_Pos);
  }
  
  __STATIC_INLINE void nrf_spim_disable(NRF_SPIM_Type * p_spim)
  {
      p_spim->ENABLE = (SPIM_ENABLE_ENABLE_Disabled << SPIM_ENABLE_ENABLE_Pos);
  }
  
  __STATIC_INLINE void nrf_spim_pins_set(NRF_SPIM_Type * p_spim,
                                         uint32_t sck_pin,
                                         uint32_t mosi_pin,
                                         uint32_t miso_pin)
  {
      p_spim->PSEL.SCK  = sck_pin;
      p_spim->PSEL.MOSI = mosi_pin;
      p_spim->PSEL.MISO = miso_pin;
  }
  
  __STATIC_INLINE void nrf_spim_frequency_set(NRF_SPIM_Type * p_spim,
                                              nrf_spim_frequency_t frequency)
  {
      p_spim->FREQUENCY = frequency;
  }
  
  __STATIC_INLINE void nrf_spim_tx_buffer_set(NRF_SPIM_Type * p_spim,
                                              uint8_t const * p_buffer,
                                              uint8_t         length)
  {
      p_spim->TXD.PTR    = (uint32_t)p_buffer;
      p_spim->TXD.MAXCNT = length;
  }
  
  __STATIC_INLINE void nrf_spim_rx_buffer_set(NRF_SPIM_Type * p_spim,
                                              uint8_t * p_buffer,
                                              uint8_t   length)
  {
      p_spim->RXD.PTR    = (uint32_t)p_buffer;
      p_spim->RXD.MAXCNT = length;
  }
  
  __STATIC_INLINE void nrf_spim_configure(NRF_SPIM_Type * p_spim,
                                          nrf_spim_mode_t spi_mode,
                                          nrf_spim_bit_order_t spi_bit_order)
  {
      uint32_t config = (spi_bit_order == NRF_SPIM_BIT_ORDER_MSB_FIRST ?
          SPIM_CONFIG_ORDER_MsbFirst : SPIM_CONFIG_ORDER_LsbFirst);
      switch (spi_mode)
      {
      default:
      case NRF_SPIM_MODE_0:
          config |= (SPIM_CONFIG_CPOL_ActiveHigh << SPIM_CONFIG_CPOL_Pos) |
                    (SPIM_CONFIG_CPHA_Leading    << SPIM_CONFIG_CPHA_Pos);
          break;
  
      case NRF_SPIM_MODE_1:
          config |= (SPIM_CONFIG_CPOL_ActiveHigh << SPIM_CONFIG_CPOL_Pos) |
                    (SPIM_CONFIG_CPHA_Trailing   << SPIM_CONFIG_CPHA_Pos);
          break;
  
      case NRF_SPIM_MODE_2:
          config |= (SPIM_CONFIG_CPOL_ActiveLow  << SPIM_CONFIG_CPOL_Pos) |
                    (SPIM_CONFIG_CPHA_Leading    << SPIM_CONFIG_CPHA_Pos);
          break;
  
      case NRF_SPIM_MODE_3:
          config |= (SPIM_CONFIG_CPOL_ActiveLow  << SPIM_CONFIG_CPOL_Pos) |
                    (SPIM_CONFIG_CPHA_Trailing   << SPIM_CONFIG_CPHA_Pos);
          break;
      }
      p_spim->CONFIG = config;
  }
  
  __STATIC_INLINE void nrf_spim_orc_set(NRF_SPIM_Type * p_spim,
                                        uint8_t orc)
  {
      p_spim->ORC = orc;
  }
  
  #endif // SUPPRESS_INLINE_IMPLEMENTATION
  
  #endif // NRF_SPIM_H__
  
  /** @} */
  