#define OnRev ( _ports,
_pwr   )     OnRevEx(_ports, _pwr, RESET_BLOCKANDTACHO)

Run motors backward.

Set outputs to reverse direction and turn them on.

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.

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