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cpu/nrf52: fix RSSI calculation in nrf802154_radio

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This commit is contained in:
Mikolai Gütschow 2024-08-28 11:40:44 +02:00
parent b056060bd8
commit 076dcefb92
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1 changed files with 7 additions and 4 deletions
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11
cpu/nrf52/radio/nrf802154/nrf802154_radio.c
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@ -337,10 +337,13 @@ static int _read(ieee802154_dev_t *dev, void *buf, size_t max_size,
radio_info->lqi = (uint8_t)(hwlqi > UINT8_MAX/ED_RSSISCALE radio_info->lqi = (uint8_t)(hwlqi > UINT8_MAX/ED_RSSISCALE
? UINT8_MAX ? UINT8_MAX
: hwlqi * ED_RSSISCALE); : hwlqi * ED_RSSISCALE);
/* We calculate RSSI from LQI, since it's already 8-bit /* Converting the hardware-provided LQI value back to the
saturated (see page 321 of product spec v1.1) */ original RSSI value is not properly documented in the PS.
radio_info->rssi = _hwval_to_ieee802154_dbm(radio_info->lqi) The linear mapping used here has been found empirically
+ IEEE802154_RADIO_RSSI_OFFSET; through comparison with the RSSI value provided by NRF_RADIO->RSSISAMPLE
after enabling the ADDRESS_RSSISTART short. */
int8_t rssi_dbm = hwlqi + ED_RSSIOFFS - 1;
radio_info->rssi = ieee802154_dbm_to_rssi(rssi_dbm);
} }
memcpy(buf, &rxbuf[1], pktlen); memcpy(buf, &rxbuf[1], pktlen);
} }