nrf_802154_nrfx_addons.h

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/*
 * Copyright (c) 2017, Nordic Semiconductor ASA
 * All rights reserved.
 *
 * SPDX-License-Identifier: BSD-3-Clause
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 * list of conditions and the following disclaimer.
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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__