text: /**
   * Copyright (c) 2017 - 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 "nrf_drv_spi.h"
  
  #ifdef SPIM_PRESENT
  #define INSTANCE_COUNT   SPIM_COUNT
  #else
  #define INSTANCE_COUNT   SPI_COUNT
  #endif
  
  static nrf_drv_spi_evt_handler_t m_handlers[INSTANCE_COUNT];
  static void *                    m_contexts[INSTANCE_COUNT];
  
  #ifdef SPIM_PRESENT
  static void spim_evt_handler(nrfx_spim_evt_t const * p_event,
                               void *                  p_context)
  {
      uint32_t inst_idx = (uint32_t)p_context;
      nrf_drv_spi_evt_t const event =
      {
          .type = (nrf_drv_spi_evt_type_t)p_event->type,
          .data =
          {
              .done =
              {
                  .p_tx_buffer = p_event->xfer_desc.p_tx_buffer,
                  .tx_length   = p_event->xfer_desc.tx_length,
                  .p_rx_buffer = p_event->xfer_desc.p_rx_buffer,
                  .rx_length   = p_event->xfer_desc.rx_length,
              }
          }
      };
      m_handlers[inst_idx](&event, m_contexts[inst_idx]);
  }
  #endif // SPIM_PRESENT
  
  #ifdef SPI_PRESENT
  static void spi_evt_handler(nrfx_spi_evt_t const * p_event,
                              void *                 p_context)
  {
      uint32_t inst_idx = (uint32_t)p_context;
      nrf_drv_spi_evt_t const event =
      {
          .type = (nrf_drv_spi_evt_type_t)p_event->type,
          .data =
          {
              .done =
              {
                  .p_tx_buffer = p_event->xfer_desc.p_tx_buffer,
                  .tx_length   = p_event->xfer_desc.tx_length,
                  .p_rx_buffer = p_event->xfer_desc.p_rx_buffer,
                  .rx_length   = p_event->xfer_desc.rx_length,
              }
          }
      };
      m_handlers[inst_idx](&event, m_contexts[inst_idx]);
  }
  #endif // SPI_PRESENT
  
  ret_code_t nrf_drv_spi_init(nrf_drv_spi_t const * const p_instance,
                              nrf_drv_spi_config_t const * p_config,
                              nrf_drv_spi_evt_handler_t    handler,
                              void *                       p_context)
  {
      uint32_t inst_idx = p_instance->inst_idx;
      m_handlers[inst_idx] = handler;
      m_contexts[inst_idx] = p_context;
  
      ret_code_t result = 0;
      if (NRF_DRV_SPI_USE_SPIM)
      {
  #ifdef SPIM_PRESENT
          nrfx_spim_config_t config_spim = NRFX_SPIM_DEFAULT_CONFIG;
          config_spim.sck_pin        = p_config->sck_pin;
          config_spim.mosi_pin       = p_config->mosi_pin;
          config_spim.miso_pin       = p_config->miso_pin;
          config_spim.ss_pin         = p_config->ss_pin;
          config_spim.irq_priority   = p_config->irq_priority;
          config_spim.orc            = p_config->orc;
          config_spim.frequency      = (nrf_spim_frequency_t)p_config->frequency;
          config_spim.mode           = (nrf_spim_mode_t)p_config->mode;
          config_spim.bit_order      = (nrf_spim_bit_order_t)p_config->bit_order;
          result = nrfx_spim_init(&p_instance->u.spim,
                                  &config_spim,
                                  handler ? spim_evt_handler : NULL,
                                  (void *)inst_idx);
  #endif
      }
      else if (NRF_DRV_SPI_USE_SPI)
      {
          result = nrfx_spi_init(&p_instance->u.spi,
                                 (nrfx_spi_config_t const *)p_config,
                                 handler ? spi_evt_handler : NULL,
                                 (void *)inst_idx);
      }
      return result;
  }
  