Overview

The FRSKY parameter group configures the telemetry output for FrSky radio systems (SmartPort and D-Series). This allows you to see live battery voltage, GPS position, and flight mode directly on your FrSky transmitter screen.

Key Concepts

1. Telemetry Options (FRSKY_OPTIONS)

A bitmask for advanced features.

• Bit 0: Enable Passthrough (Requires OpenTX/EdgeTX and a Lua script like Yaapu). This is the modern, high-bandwidth method.
• Bit 1: Enable individual sensor IDs.

2. D-Series vs SmartPort

• D-Series: Legacy (Hub protocol).
• SmartPort (S.Port): Modern, bi-directional protocol used by X-series receivers (X8R, R-XSR).

Parameter Breakdown

• FRSKY_D_RATE: Update rate for D-Series telemetry.
• FRSKY_OPTIONS: Bitmask for Passthrough and other features.

Integration Guide

1. Hardware: Connect the S.Port pin of your receiver to a UART TX pin. (Note: FrSky S.Port is inverted; many boards have a dedicated "FrSky" port or require SERIALx_OPTIONS to enable inversion).
2. Protocol: Set SERIALx_PROTOCOL = 10 (Passthrough) or 4 (SmartPort).
3. Lua Script: If using Passthrough, download and install the Yaapu Telemetry Script on your Taranis/Horus/TX16S.

Developer Notes

• Library: libraries/AP_Frsky_Telem.