DSHOT is a digital ESC protocol. When used bidirectionally, it feeds motor RPM back to the flight controller, enabling the RPM filter — the single biggest improvement to motor noise rejection in modern Betaflight tunes. For the byte-level view of how the frames and eRPM telemetry are encoded on the wire, see DSHOT on …

DSHOT is the digital FC-to-ESC protocol. Every PID loop the flight controller sends a fixed-length frame carrying a throttle value plus a checksum; in bidirectional mode the ESC answers on the same wire with its electrical RPM. This is the byte-level view — what actually travels down the signal wire. For the tuning …