DRV8825 + model 1200 stepper motor: 50 RPM max.?

My problem is, I can't get the motor to run beyond about 1 kHz on the STEP pin. At this frequency the motor is spinning (I'm guessing) at about 50 RPM

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DRV8825 + model 1200 stepper motor: 50 RPM max.?
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Tagged as: causes-the-motor, frequency, frequency-beyond, frequency-the-motor, increasing-the-step, Motor, RPM, run-beyond, Step, the-motor