text: /*
   * Copyright (c) 2012 - 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 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 the copyright holder nor the names of its
   *    contributors may be used to endorse or promote products derived from this
   *    software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
   * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER 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.
   */
  /**
   *@file
   *@brief NMVC driver implementation
   */
  
  #include <nrfx.h>
  #include "nrf_nvmc.h"
  
  static inline void wait_for_flash_ready(void)
  {
      while (NRF_NVMC->READY == NVMC_READY_READY_Busy) {;}
  }
  
  void nrf_nvmc_page_erase(uint32_t address)
  {
      // Enable erase.
      NRF_NVMC->CONFIG = NVMC_CONFIG_WEN_Een;
      __ISB();
      __DSB();
  
      // Erase the page
      NRF_NVMC->ERASEPAGE = address;
      wait_for_flash_ready();
  
      NRF_NVMC->CONFIG = NVMC_CONFIG_WEN_Ren;
      __ISB();
      __DSB();
  }
  
  
  void nrf_nvmc_write_byte(uint32_t address, uint8_t value)
  {
      uint32_t byte_shift = address & (uint32_t)0x03;
      uint32_t address32 = address & ~byte_shift; // Address to the word this byte is in.
      uint32_t value32 = (*(uint32_t*)address32 & ~((uint32_t)0xFF << (byte_shift << (uint32_t)3)));
      value32 = value32 + ((uint32_t)value << (byte_shift << 3));
  
      // Enable write.
      NRF_NVMC->CONFIG = (NVMC_CONFIG_WEN_Wen << NVMC_CONFIG_WEN_Pos);
      __ISB();
      __DSB();
  
      *(uint32_t*)address32 = value32;
      wait_for_flash_ready();
  
      NRF_NVMC->CONFIG = (NVMC_CONFIG_WEN_Ren << NVMC_CONFIG_WEN_Pos);
      __ISB();
      __DSB();
  }
  
  void nrf_nvmc_write_word(uint32_t address, uint32_t value)
  {
      // Enable write.
      NRF_NVMC->CONFIG = NVMC_CONFIG_WEN_Wen;
      __ISB();
      __DSB();
  
      *(uint32_t*)address = value;
      wait_for_flash_ready();
  
      NRF_NVMC->CONFIG = NVMC_CONFIG_WEN_Ren;
      __ISB();
      __DSB();
  }
  
  void nrf_nvmc_write_bytes(uint32_t address, const uint8_t * src, uint32_t num_bytes)
  {
      uint32_t i;
      for (i = 0; i < num_bytes; i++)
      {
         nrf_nvmc_write_byte(address + i,src[i]);
      }
  }
  
  void nrf_nvmc_write_words(uint32_t address, const uint32_t * src, uint32_t num_words)
  {
      uint32_t i;
  
      // Enable write.
      NRF_NVMC->CONFIG = NVMC_CONFIG_WEN_Wen;
      __ISB();
      __DSB();
  
      for (i = 0; i < num_words; i++)
      {
          ((uint32_t*)address)[i] = src[i];
          wait_for_flash_ready();
      }
  
      NRF_NVMC->CONFIG = NVMC_CONFIG_WEN_Ren;
      __ISB();
      __DSB();
  }
  