/**
 * Copyright (c) 2014 - 2017, 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
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 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */

/** @file
 * @defgroup rng_example_main main.c
 * @{
 * @ingroup rng_example
 * @brief Random Number Generator Example Application main file.
 *
 */


#include <stdio.h>
#include <stdint.h>
#include "boards.h"
#include "nrf_delay.h"
#include "app_uart.h"
#include "app_error.h"
#include "nrf_drv_rng.h"
#include "nrf_assert.h"

#define NRF_LOG_MODULE_NAME "APP"
#include "nrf_log.h"
#include "nrf_log_ctrl.h"

#ifdef SOFTDEVICE_PRESENT
#include "softdevice_handler.h"
#endif // SOFTDEVICE_PRESENT

#define RANDOM_BUFF_SIZE    16      /**< Random numbers buffer size. */

/** @brief Function for getting vector of random numbers.
 *
 * @param[out] p_buff       Pointer to unit8_t buffer for storing the bytes.
 * @param[in]  length       Number of bytes to take from pool and place in p_buff.
 *
 * @retval     Number of bytes actually placed in p_buff.
 */
static uint8_t random_vector_generate(uint8_t * p_buff, uint8_t size)
{
    uint32_t err_code;
    uint8_t  available;

    nrf_drv_rng_bytes_available(&available);
    uint8_t length = MIN(size, available);

    err_code = nrf_drv_rng_rand(p_buff, length);
    APP_ERROR_CHECK(err_code);

    return length;
}

/** @brief Function for main application entry.
 */
int main(void)
{
    uint32_t err_code;

    err_code = NRF_LOG_INIT(NULL);
    APP_ERROR_CHECK(err_code);

#ifdef SOFTDEVICE_PRESENT
    nrf_clock_lf_cfg_t clock_lf_cfg = NRF_CLOCK_LFCLKSRC;
    SOFTDEVICE_HANDLER_INIT(&clock_lf_cfg, NULL);
#endif // SOFTDEVICE_PRESENT

    err_code = nrf_drv_rng_init(NULL);
    APP_ERROR_CHECK(err_code);

    while (true)
    {
        uint8_t p_buff[RANDOM_BUFF_SIZE];
        uint8_t length = random_vector_generate(p_buff,RANDOM_BUFF_SIZE);
        NRF_LOG_INFO("Random Vector:\r\n");
        NRF_LOG_HEXDUMP_INFO(p_buff, length);
        NRF_LOG_INFO("\r\n");
        NRF_LOG_FLUSH();
        nrf_delay_ms(100);
    }
}


/** @} */
