#define OnRevSync ( _ports,
_pwr,
_turnpct   )     OnRevSyncEx(_ports, _pwr, _turnpct, RESET_BLOCKANDTACHO)

Run motors backward synchronised.

Run the specified outputs in reverse with regulated synchronization using the specified turn ratio.

Parameters:
_ports Desired output ports. Can be a constant or a variable, see Output port constants. If you use a variable and want to control multiple outputs in a single call you need to use a byte array rather than a byte and store the output port values in the byte array before passing it into this function.
_pwr Output power, 0 to 100. Can be negative to reverse direction.
_turnpct Turn ratio, -100 to 100. The direction of your vehicle will depend on its construction.

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