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Merge pull request #10725 from TonyBlit/snr_fix

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Crossfire RSNR used for RSSI calculation
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J Blackman 2021-07-29 21:28:10 +10:00 • committed by GitHub
commit 1957c6c881
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1 changed files with 13 additions and 5 deletions
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18
src/main/rx/crsf.c
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@ -228,13 +228,21 @@ static void handleCrsfLinkStatisticsFrame(const crsfLinkStatistics_t* statsPtr,
lastLinkStatisticsFrameUs = currentTimeUs;
int16_t rssiDbm = -1 * (stats.active_antenna ? stats.uplink_RSSI_2 : stats.uplink_RSSI_1);
if (rssiSource == RSSI_SOURCE_RX_PROTOCOL_CRSF) {
const uint16_t rssiPercentScaled = scaleRange(rssiDbm, CRSF_RSSI_MIN, 0, 0, RSSI_MAX_VALUE);
setRssi(rssiPercentScaled, RSSI_SOURCE_RX_PROTOCOL_CRSF);
if (rxConfig()->crsf_use_rx_snr) {
// -10dB of SNR mapped to 0 RSSI (fail safe is likely to happen at this measure)
// 0dB of SNR mapped to 20 RSSI (default alarm)
// 41dB of SNR mapped to 99 RSSI (SNR can climb to around 60, but showing that is not very meaningful)
const uint16_t rsnrPercentScaled = constrain((stats.uplink_SNR + 10) * 20, 0, RSSI_MAX_VALUE);
setRssi(rsnrPercentScaled, RSSI_SOURCE_RX_PROTOCOL_CRSF);
#ifdef USE_RX_RSSI_DBM
rssiDbm = stats.uplink_SNR;
#endif
} else {
const uint16_t rssiPercentScaled = scaleRange(rssiDbm, CRSF_RSSI_MIN, 0, 0, RSSI_MAX_VALUE);
setRssi(rssiPercentScaled, RSSI_SOURCE_RX_PROTOCOL_CRSF);
}
}
#ifdef USE_RX_RSSI_DBM
if (rxConfig()->crsf_use_rx_snr) {
rssiDbm = stats.uplink_SNR;
}
setRssiDbm(rssiDbm, RSSI_SOURCE_RX_PROTOCOL_CRSF);
#endif