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34 changes: 34 additions & 0 deletions docs/Serial.md
Original file line number Diff line number Diff line change
Expand Up @@ -89,3 +89,37 @@ The allowable baud rates are as follows:
| 14 | 1500000 |
| 15 | 2000000 |
| 16 | 2470000 |


### Function numbers as of 2025

| Function | Number |
| -------------------------- | -------------------------------------------------- |
| NONE | 0, |
| MSP | (1 << 0), // 1 |
| GPS | (1 << 1), // 2 |
| UNUSED_3 | (1 << 2), // 4 //Was FUNCTION_TELEMETRY_FRSKY |
| TELEMETRY_HOTT | (1 << 3), // 8 |
| TELEMETRY_LTM | (1 << 4), // 16 |
| TELEMETRY_SMARTPORT | (1 << 5), // 32 |
| RX_SERIAL | (1 << 6), // 64 |
| BLACKBOX | (1 << 7), // 128 |
| TELEMETRY_MAVLINK | (1 << 8), // 256 |
| TELEMETRY_IBUS | (1 << 9), // 512 |
| RCDEVICE | (1 << 10), // 1024 |
| VTX_SMARTAUDIO | (1 << 11), // 2048 |
| VTX_TRAMP | (1 << 12), // 4096 |
| UNUSED_1 | (1 << 13), // 8192: former\ UAV_INTERCONNECT |
| OPTICAL_FLOW | (1 << 14), // 16384 |
| LOG | (1 << 15), // 32768 |
| RANGEFINDER | (1 << 16), // 65536 |
| VTX_FFPV | (1 << 17), // 131072 |
| ESCSERIAL | (1 << 18), // 262144: this is used for both SERIALSHOT and ESC_SENSOR telemetry |
| TELEMETRY_SIM | (1 << 19), // 524288 |
| FRSKY_OSD | (1 << 20), // 1048576 |
| DJI_HD_OSD | (1 << 21), // 2097152 |
| SERVO_SERIAL | (1 << 22), // 4194304 |
| TELEMETRY_SMARTPORT_MASTER | (1 << 23), // 8388608 |
| UNUSED_2 | (1 << 24), // 16777216 |
| MSP_OSD | (1 << 25), // 33554432 |