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cpu/cc2538: fix RSSI computation #22464

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cpu/cc2538: fix RSSI computation #22464

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f3d9b6d
cpu/cc2538: fix RSSI computation
maribu Jul 10, 2026
4f3db9d
Update cpu/cc2538/radio/cc2538_rf_radio_ops.c
maribu Jul 15, 2026
8cc2ab0
fixup! Update cpu/cc2538/radio/cc2538_rf_radio_ops.c
maribu Jul 15, 2026
b4268c5
fixup! fixup! Update cpu/cc2538/radio/cc2538_rf_radio_ops.c
maribu Jul 15, 2026
5265237
Update cpu/cc2538/radio/cc2538_rf_radio_ops.c
maribu Jul 15, 2026
5a829af
Update cpu/cc2538/radio/cc2538_rf_radio_ops.c
maribu Jul 16, 2026
390554d
Update cpu/cc2538/radio/cc2538_rf_radio_ops.c
kfessel Jul 16, 2026
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13 changes: 8 additions & 5 deletions cpu/cc2538/radio/cc2538_rf_radio_ops.c
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Original file line number Diff line number Diff line change
Expand Up @@ -303,11 +303,14 @@ static int _read(ieee802154_dev_t *dev, void *buf, size_t size, ieee802154_rx_in
* received packet */
/* Make sure there is no overflow even if no signal with such
low sensitivity should be detected */
const int hw_rssi_min = IEEE802154_RADIO_RSSI_OFFSET -
CC2538_RSSI_OFFSET;
int8_t hw_rssi = rssi_val > hw_rssi_min ?
(CC2538_RSSI_OFFSET + rssi_val) : IEEE802154_RADIO_RSSI_OFFSET;
info->rssi = hw_rssi - IEEE802154_RADIO_RSSI_OFFSET;
const int hw_info_rssi_offset = CC2538_RSSI_OFFSET
- IEEE802154_RADIO_RSSI_OFFSET;
if (rssi_val + hw_info_rssi_offset >= 0) {
info->rssi = rssi_val + hw_info_rssi_offset;
}
else {
info->rssi = 0;
}

corr_val = rfcore_read_byte() & CC2538_CORR_VAL_MASK;
if (corr_val < CC2538_CORR_VAL_MIN) {
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