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Code Issues Releases Activity

LP-291 Changed noise floor level to -110 to be closer to real noise level instead of absolute -127

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This commit is contained in:
Vladimir Zidar 2016-04-25 13:28:10 +02:00
parent 22cf21c335
commit 8dbf9e7d31
1 changed files with 16 additions and 4 deletions
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20
flight/modules/UAVOMSPBridge/UAVOMSPBridge.c
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@ -72,6 +72,13 @@
#if defined(PIOS_INCLUDE_MSP_BRIDGE)
// oplink rssi - absolute low : -127 noise floor (set by software when link is completely lost)
// in reality : around -110
// max: various articles found on web quote -10 as maximum received signal power expressed in dBm.
#define OPLINK_LOW_RSSI -110
#define OPLINK_HIGH_RSSI -10
#define MSP_SENSOR_ACC (1 << 0)
#define MSP_SENSOR_BARO (1 << 1)
#define MSP_SENSOR_MAG (1 << 2)
@ -458,11 +465,16 @@ static void msp_send_analog(struct msp_bridge *m)
int8_t rssi;
OPLinkStatusRSSIGet(&rssi);
// oplink rssi - low: -127 noise floor (set by software when link is completely lost)
// max: various articles found on web quote -10 as maximum received signal power expressed in dBm.
// MSP values have no units, and OSD rssi display requires calibration anyway, so we will translate -127 to -10 -> 0-1023
// MSP values have no units, and OSD rssi display requires calibration anyway, so we will translate OPLINK_LOW_RSSI to OPLINK_HIGH_RSSI -> 0-1023
data.status.rssi = ((127 + rssi) * 1023) / (127 - 10);
if (rssi < OPLINK_LOW_RSSI) {
rssi = OPLINK_LOW_RSSI;
} else if (rssi > OPLINK_HIGH_RSSI) {
rssi = OPLINK_HIGH_RSSI;
}
data.status.rssi = ((rssi - OPLINK_LOW_RSSI) * 1023) / (OPLINK_HIGH_RSSI - OPLINK_LOW_RSSI);
} else {
uint8_t quality;
ReceiverStatusQualityGet(&quality);