Enable / disable stepping motor A4988

[shsmad]

On A4988 one can see pins: direction, step and enable. Direction and step are controlled by A4988Nema(direction, step, …), but one can alse enable and disable motor sending 0 or 1 to «enable»-pin. For example, if one send GPIO.output(enable-pin, 1) motor goes into free mode, where one can manually change the position of the motor (motor_go doesn't rotate motor), and when one send GPIO.output(enable-pin, 0) motor goes into locked-position mode, where one can't manually change the position of the motor and only motor_go can rotate motor.

May be it would be convenient to have such an interface in the class with the ability to control the motor mode?

[gavinlyonsrepo]

Will do.