/**
 * Copyright (c) 2016 - 2020, Nordic Semiconductor ASA
 *
 * All rights reserved.
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 * 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
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/** @file
 *
 * @brief fstorage example main file.
 *
 * This example showcases fstorage usage.
 */

#include <stdint.h>
#include <stdbool.h>
#include <string.h>

#include "nrf.h"
#include "nrf_soc.h"
#include "nordic_common.h"
#include "boards.h"
#include "app_timer.h"
#include "app_util.h"
#include "nrf_fstorage.h"

#ifdef SOFTDEVICE_PRESENT
#include "nrf_sdh.h"
#include "nrf_sdh_ble.h"
#include "nrf_fstorage_sd.h"
#else
#include "nrf_drv_clock.h"
#include "nrf_fstorage_nvmc.h"
#endif

#include "nrf_log.h"
#include "nrf_log_ctrl.h"
//.#include "nrf_log_default_backends.h"


#define BUTTON_DETECTION_DELAY  APP_TIMER_TICKS(50)
#define APP_BLE_CONN_CFG_TAG    1
char dummy_data[20];

/* Defined in cli.c */
extern void cli_init(void);
extern void cli_start(void);
extern void cli_process(void);

static void fstorage_evt_handler(nrf_fstorage_evt_t * p_evt);


NRF_FSTORAGE_DEF(nrf_fstorage_t fstorage) =
{
    /* Set a handler for fstorage events. */
    .evt_handler = fstorage_evt_handler,

    /* These below are the boundaries of the flash space assigned to this instance of fstorage.
     * You must set these manually, even at runtime, before nrf_fstorage_init() is called.
     * The function nrf5_flash_end_addr_get() can be used to retrieve the last address on the
     * last page of flash available to write data. */
    .start_addr = 0x3e000,
    .end_addr   = 0x3ffff,
};

/* Dummy data to write to flash. */
static uint32_t m_data          = 0xBADC0FFE;
 char     m_hello_world[] = "TESTCONDITION";
 char m_hello_world_[] = "test";


/**@brief   Helper function to obtain the last address on the last page of the on-chip flash that
 *          can be used to write user data.
 */
static uint32_t nrf5_flash_end_addr_get()
{
    uint32_t const bootloader_addr = BOOTLOADER_ADDRESS;
    uint32_t const page_sz         = NRF_FICR->CODEPAGESIZE;
    uint32_t const code_sz         = NRF_FICR->CODESIZE;

    return (bootloader_addr != 0xFFFFFFFF ?
            bootloader_addr : (code_sz * page_sz));
}


#ifdef SOFTDEVICE_PRESENT
/**@brief   Function for initializing the SoftDevice and enabling the BLE stack. */
static void ble_stack_init(void)
{
    ret_code_t rc;
    uint32_t   ram_start;

    /* Enable the SoftDevice. */
    rc = nrf_sdh_enable_request();
    APP_ERROR_CHECK(rc);

    rc = nrf_sdh_ble_default_cfg_set(APP_BLE_CONN_CFG_TAG, &ram_start);
    APP_ERROR_CHECK(rc);

    rc = nrf_sdh_ble_enable(&ram_start);
    APP_ERROR_CHECK(rc);
}
#else
static void clock_init(void)
{
    /* Initialize the clock. */
    ret_code_t rc = nrf_drv_clock_init();
    APP_ERROR_CHECK(rc);

    nrf_drv_clock_lfclk_request(NULL);

    // Wait for the clock to be ready.
    while (!nrf_clock_lf_is_running()) {;}
}
#endif


/**@brief   Initialize the timer. */
static void timer_init(void)
{
    ret_code_t err_code = app_timer_init();
    APP_ERROR_CHECK(err_code);
}


/**@brief   Sleep until an event is received. */
static void power_manage(void)
{
#ifdef SOFTDEVICE_PRESENT
    (void) sd_app_evt_wait();
#else
    __WFE();
#endif
}


static void fstorage_evt_handler(nrf_fstorage_evt_t * p_evt)
{
    if (p_evt->result != NRF_SUCCESS)
    {
        NRF_LOG_INFO("--> Event received: ERROR while executing an fstorage operation.");
        return;
    }

    switch (p_evt->id)
    {
        case NRF_FSTORAGE_EVT_WRITE_RESULT:
        {
            NRF_LOG_INFO("--> Event received: wrote %d bytes at address 0x%x.",
                         p_evt->len, p_evt->addr);
        } break;

        case NRF_FSTORAGE_EVT_ERASE_RESULT:
        {
            NRF_LOG_INFO("--> Event received: erased %d page from address 0x%x.",
                         p_evt->len, p_evt->addr);
        } break;

        default:
            break;
    }
}


static void print_flash_info(nrf_fstorage_t * p_fstorage)
{
    NRF_LOG_INFO("========| flash info |========");
    NRF_LOG_INFO("erase unit: \t%d bytes",      p_fstorage->p_flash_info->erase_unit);
    NRF_LOG_INFO("program unit: \t%d bytes",    p_fstorage->p_flash_info->program_unit);
    NRF_LOG_INFO("==============================");
}


void wait_for_flash_ready(nrf_fstorage_t const * p_fstorage)
{
    /* While fstorage is busy, sleep and wait for an event. */
    while (nrf_fstorage_is_busy(p_fstorage))
    {
        power_manage();
    }
}


static void log_init(void)
{
    ret_code_t rc = NRF_LOG_INIT(NULL);
    APP_ERROR_CHECK(rc);
}


int main(void)
{
    ret_code_t rc;

#ifndef SOFTDEVICE_PRESENT
    clock_init();
#endif

    timer_init();
    log_init();
    cli_init();
    printf("INITIALIZATION");
    NRF_LOG_INFO("fstorage example started.");

    nrf_fstorage_api_t * p_fs_api;

#ifdef SOFTDEVICE_PRESENT
    NRF_LOG_INFO("SoftDevice is present.");
    NRF_LOG_INFO("Initializing nrf_fstorage_sd implementation...");
    /* Initialize an fstorage instance using the nrf_fstorage_sd backend.
     * nrf_fstorage_sd uses the SoftDevice to write to flash. This implementation can safely be
     * used whenever there is a SoftDevice, regardless of its status (enabled/disabled). */
    p_fs_api = &nrf_fstorage_sd;
#else
    NRF_LOG_INFO("SoftDevice not present.");
    NRF_LOG_INFO("Initializing nrf_fstorage_nvmc implementation...");
    /* Initialize an fstorage instance using the nrf_fstorage_nvmc backend.
     * nrf_fstorage_nvmc uses the NVMC peripheral. This implementation can be used when the
     * SoftDevice is disabled or not present.
     *
     * Using this implementation when the SoftDevice is enabled results in a hardfault. */
    p_fs_api = &nrf_fstorage_nvmc;
#endif

    rc = nrf_fstorage_init(&fstorage, p_fs_api, NULL);
    APP_ERROR_CHECK(rc);

    print_flash_info(&fstorage);

    /* It is possible to set the start and end addresses of an fstorage instance at runtime.
     * They can be set multiple times, should it be needed. The helper function below can
     * be used to determine the last address on the last page of flash memory available to
     * store data. */
    (void) nrf5_flash_end_addr_get();
    //rc = nrf_fstorage_erase(&fstorage,0x3F000);
    /* Let's write to flash. */
    NRF_LOG_INFO("Writing \"%x\" to flash.", m_data);
    rc = nrf_fstorage_write(&fstorage, 0x3e000, &m_data, sizeof(m_data), NULL);
    APP_ERROR_CHECK(rc);

    wait_for_flash_ready(&fstorage);
    NRF_LOG_INFO("Done.");

#ifdef SOFTDEVICE_PRESENT
    /* Enable the SoftDevice and the BLE stack. */
    NRF_LOG_INFO("Enabling the SoftDevice.");
    ble_stack_init();

    m_data = 0xDEADBEEF;

    NRF_LOG_INFO("Writing \"%x\" to flash.", m_data);
    rc = nrf_fstorage_write(&fstorage, 0x3e100, &m_data, sizeof(m_data), NULL);
    APP_ERROR_CHECK(rc);

    wait_for_flash_ready(&fstorage);
    NRF_LOG_INFO("Done.");
#endif

    NRF_LOG_INFO("Writing \"%s\" to flash.", m_hello_world);
    rc = nrf_fstorage_write(&fstorage, 0x3f000, m_hello_world, sizeof(m_hello_world), NULL);
    APP_ERROR_CHECK(rc);
    printf("NRF_STORAGE_ATTEMPT_3");
    wait_for_flash_ready(&fstorage);
    NRF_LOG_INFO("Done.");
    // This is where the new variable is being stored
    rc = nrf_fstorage_write(&fstorage, 0x3f100, m_hello_world_, sizeof(m_hello_world_), NULL);
    printf("NRF_STORAGE_ATTEMPT_4");
    APP_ERROR_CHECK(rc);
    wait_for_flash_ready(&fstorage);
    printf("DONE");
    
    rc = nrf_fstorage_read(&fstorage, 0x3f100, &dummy_data,13);    
      printf("reading previously written_data");
      for(int i = 0; i < 13; i ++){
        printf("%c",*(dummy_data + i));

        }
   APP_ERROR_CHECK(rc);
    NRF_LOG_INFO("Use 'read' to read bytes from the flash.");
    NRF_LOG_INFO("Use 'write' to write bytes to the flash.");
    NRF_LOG_INFO("Use 'erase' to erase flash pages.");
    NRF_LOG_INFO("Use 'flasharea' to print and configure the flash read boundaries.");

    cli_start();

    /* Enter main loop. */
    for (;;)
    {
        if (!NRF_LOG_PROCESS())
        {
            power_manage();
        }
        cli_process();
    }
}


/**
 * @}
 */