/* 
 * Copyright (c) 2012 Nordic Semiconductor ASA
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 * 
 *   1. Redistributions of source code must retain the above copyright notice, this list 
 *      of conditions and the following disclaimer.
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 *   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 or object form under this license must not be reverse 
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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 */
 

/** 
 *@file
 *@brief NMVC driver implementation 
 */

#include <stdbool.h>
#include "nrf.h"
#include "nrf_nvmc.h"


void nrf_nvmc_page_erase(uint32_t address)
{ 
  // Enable erase.
  NRF_NVMC->CONFIG = NVMC_CONFIG_WEN_Een;
  while (NRF_NVMC->READY == NVMC_READY_READY_Busy)
  {
  }

  // Erase the page
  NRF_NVMC->ERASEPAGE = address;
  while (NRF_NVMC->READY == NVMC_READY_READY_Busy)
  {
  }
  
  NRF_NVMC->CONFIG = NVMC_CONFIG_WEN_Ren;
  while (NRF_NVMC->READY == NVMC_READY_READY_Busy)
  {
  }
}


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);
  while (NRF_NVMC->READY == NVMC_READY_READY_Busy)
  {
  }

  *(uint32_t*)address32 = value32;
  while(NRF_NVMC->READY == NVMC_READY_READY_Busy)
  {
  }

  NRF_NVMC->CONFIG = (NVMC_CONFIG_WEN_Ren << NVMC_CONFIG_WEN_Pos);
  {
  }
}

void nrf_nvmc_write_word(uint32_t address, uint32_t value)
{
  // Enable write.
  NRF_NVMC->CONFIG = NVMC_CONFIG_WEN_Wen;
  while (NRF_NVMC->READY == NVMC_READY_READY_Busy){
  }

  *(uint32_t*)address = value;
  while (NRF_NVMC->READY == NVMC_READY_READY_Busy){
  }

  NRF_NVMC->CONFIG = NVMC_CONFIG_WEN_Ren;
  while (NRF_NVMC->READY == NVMC_READY_READY_Busy)
  {
  }
}

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;
  while (NRF_NVMC->READY == NVMC_READY_READY_Busy)
  {
  }

  for(i=0;i<num_words;i++)
  {
    ((uint32_t*)address)[i] = src[i];
    while (NRF_NVMC->READY == NVMC_READY_READY_Busy)
    {
    }
  }

  NRF_NVMC->CONFIG = NVMC_CONFIG_WEN_Ren;
  while (NRF_NVMC->READY == NVMC_READY_READY_Busy)
  {
  }
}

