When I try to setup the period with a value under 40, then the stepper 
<http://www.pololu.com/product/1200> motors stop moving and start vibrating 
like they are missing steps.  By looking at the ShoeBot app, it seems that 
Ytai is able to set the period as low as 15.  I using 2 of these DRV8834 
<http://www.pololu.com/file/0J617/drv8834.pdf> Low-Voltage Stepper Motor 
Drivers with a 1/8 microstep resolution; which are a little bit different 
to the A4988 
<http://www.pololu.com/file/0J450/a4988_DMOS_microstepping_driver_with_translator.pdf>
 
drivers used on the ShowBot.  However, I don't think they are imposing this 
limitation.  My app also uses a CLK_62K5 clock and the loop() method 
updates the period every 2ms.

Any suggestion or comment will be appreciated.

Thanks!

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