nrf_802154_nrfx_addons.h

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/*
 * Copyright (c) 2017, Nordic Semiconductor ASA
 * All rights reserved.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * Redistribution and use in source and binary forms, with or without
 * 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
 *    documentation and/or other materials provided with the distribution.
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 *    software without specific prior written permission.
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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)                                             
#define ED_RSSISCALE                4                                                 
#else
#define ED_RSSIOFFS                 (-92)                                             
#define ED_RSSISCALE                4                                                 
#endif
 
#define EDSAMPLE_MIN_REPORTED_VALUE (PHY_MIN_RECEIVER_SENSITIVITY - ED_RSSIOFFS + 10) 
#define EDSAMPLE_MAX_REPORTED_VALUE (ED_RESULT_MAX / ED_RSSISCALE)                    
 
#define ED_DBM_MIN (PHY_MIN_RECEIVER_SENSITIVITY + 10)
 
#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__