/* Copyright (c) 2016, 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.
 *
 *   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 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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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)
    {
    }
}