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Betaflight RSSI flashing zero in OSD

Problem: RSSI flashing 0 (incorrect) or extremely low in Betaflight.

Details:

Bf:  Betaflight 4.0.0, 4.0.4
rx:  Frsky R-XSR
tx:  Frsky x-lite
vtx: 
vrx
fc:  RDQ Bardwell F4 V2

Solution:

  • Configuration menu
  • RSSI (signal strength) 
  • Toggle RSSI_ADC
  • CLI
  • type: set rssi_invert = on
  • type: save

Explanation: RSSI_ADC needs to be checked. Once checked OSD will display a inverted value (ie 97 will read as 3) by default until the parameter to invert is changed via CLI.

Sources:

https://www.getfpv.com/learn/fpv-essentials/frsky-rssi-configuration-betaflight-butterflight

https://github.com/betaflight/betaflight/blob/master/docs/Rssi.md