Juuuut user from rcgroups made some tests on using digital ESC signal he called Dshot. Currently alpha firmware is available only for KISS ESC.

Quote:... the protocol sends 11-bit throttle value (2048 steps) and a 4-bit CRC to verify its correctness

Quote:the signal is sent individually on each PWM pin. it uses 600k bit rate and takes 26,7µS for one transmission like this a theoretical max loop time of 33khz would bepossible (as there need to be a space between) but im almost sure we will never need that 

advantages compared to the most used analog signals like PWM as also oneshot125 or 42 are:
- no signal jitter.. if the FC sends 1375 the ESC will receive 1375 
- high resolution (2048steps)
- no oscillator drift (nomore calibrateing ESC's)
- more robust against spikes
- safer as every singnal has a CRC (cyclic redundancy check)
- maybe later some goodies like having the ESC's beep with the buzzer signal or things like that

Here's quadmovr testing dshot: 

More money to spend on new ESC
looks like Dshot only works on STM32 MCU at the moment?

Nice. Only glanced over Boris' post in betaflight thread but didn't notice it was actually Felix' stuff.

Sounds like current spikes shouldn't be an issue anymore for the software side (no signal shifting).

Just hope betaflight people manage to reverse-engineer the flashing of kiss escs over the fc... don't wanna rip apart the 24RE again.

PS: what does "parallel" mean in this context? Is it about the crc check or something else?

http://www.rcgroups.com/forums/showthrea...&page=2642

Boris is testing it in betaflight already. So far should work for kiss 24re, and eventually at lower speed for blheli_s.

Steffen expressed possibility for BLHeli_S to support it at a quarter-rate of KISS, or close to it. But nothing specific on when it's done and whether he's working on it at the moment.

I have just summarised what DShot is in case anyone still finding it confusing...
https://oscarliang.com/dshot/