/*
 * Copyright (c) 2017, Nordic Semiconductor ASA
 * All rights reserved.
 *
 * SPDX-License-Identifier: BSD-3-Clause
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 * modification, are permitted provided that the following conditions are met:
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 *    list of conditions and the following disclaimer.
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 *    notice, this list of conditions and the following disclaimer in the
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 *    contributors may be used to endorse or promote products derived from this
 *    software without specific prior written permission.
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 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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#ifndef NRF_802154_NRFX_ADDONS_H__
#define NRF_802154_NRFX_ADDONS_H__

#include "nrfx.h"
#include "nrf_802154_config.h"
#include "nrf_802154_const.h"

/* The usage of ED_RSSISCALE is described imprecisely in the nRF product specifications. The meaning of
   this constant is the following: If we calculate ed_scaled =  EDSAMPLE *  ED_RSSISCALE, then
   it is guaranteed that in the range 0-255 ed_scaled maps linearly to the ED power in dBm. This means,
   that the maximum value in EDSAMPLE which can be reported in compliance with the 802.15.4 specification is
   255/ED_RSSISCALE. */

#if defined (NRF52833_XXAA) || defined(NRF5340_XXAA)
#define ED_RSSIOFFS                 (-93)                                             ///< dBm value corresponding to value 0 in the EDSAMPLE register.
#define ED_RSSISCALE                4                                                 ///< Factor needed to calculate the ED result based on the data from the RADIO peripheral.
#else
#define ED_RSSIOFFS                 (-92)                                             ///< dBm value corresponding to value 0 in the EDSAMPLE register.
#define ED_RSSISCALE                4                                                 ///< Factor needed to calculate the ED result based on the data from the RADIO peripheral.
#endif

#define EDSAMPLE_MIN_REPORTED_VALUE (PHY_MIN_RECEIVER_SENSITIVITY - ED_RSSIOFFS + 10) ///< Minimal reported EDSAMPLE value (reported as 0)
#define EDSAMPLE_MAX_REPORTED_VALUE (ED_RESULT_MAX / ED_RSSISCALE)                    ///< Maximal reported EDSAMPLE value (reported as 255)

/** Minimum value of ED in dBm for conversion to units conforming IEEE Std. 802.15.4-2015 chapter 10.2.5. */
#define ED_DBM_MIN (PHY_MIN_RECEIVER_SENSITIVITY + 10)

/** Maximum value of ED in dBm for conversion to units conforming IEEE Std. 802.15.4-2015 chapter 10.2.5. */
#define ED_DBM_MAX (EDSAMPLE_MAX_REPORTED_VALUE + ED_RSSIOFFS)

static inline uint8_t nrf_802154_addons_energy_level_from_dbm_calculate(int8_t ed_dbm)
{
    uint32_t r;

    if (ed_dbm < ED_DBM_MIN)
    {
        return 0;
    }

    r = ((uint32_t)(ed_dbm - ED_DBM_MIN)) * ED_RESULT_MAX / (ED_DBM_MAX - ED_DBM_MIN);

    if (r > ED_RESULT_MAX)
    {
        r = ED_RESULT_MAX;
    }

    return r;
}

#endif // NRF_802154_NRFX_ADDONS_H__