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The current grovemd driver supported 'mode2' stepping, where the driver simply passed various stepper commands to the board for it to carry out on it's own. This doesn't work very well (or at all if you have old/buggy firmware) so add a new 'mode1' stepper capability. This mode lets the driver manually control the stepping operation without requiring special firmware. This is now the default and recommended mode to use for stepper motors on this device. It is also more flexible in terms of the maximum number of steps you can do (mode2 was limited to 254 steps max). This was tested using a bipolar NEMA-17 stepper motor with an external 12v power supply. Note: 'Mode1' and 'Mode2' are the Seeed Studio terms for these different stepping modes. Signed-off-by: Jon Trulson <jtrulson@ics.com> Signed-off-by: Mihai Tudor Panu <mihai.tudor.panu@intel.com>