Modified stepgen.c

/* lookup tables for stepping types 2 and higher - phase A is the LSB */

static const unsigned char master_lut[][10] = {
    {1, 3, 2, 0, 0, 0, 0, 0, 0, 0},	/* type 2: Quadrature */
    {1, 2, 4, 0, 0, 0, 0, 0, 0, 0},	/* type 3: Three Wire */
    {1, 3, 2, 6, 4, 5, 0, 0, 0, 0},	/* type 4: Three Wire Half Step */
    {1, 2, 4, 8, 0, 0, 0, 0, 0, 0},	/* 5: Unipolar Full Step 1 */
    {3, 6, 12, 9, 0, 0, 0, 0, 0, 0},	/* 6: Unipoler Full Step 2 */
    {1, 7, 14, 8, 0, 0, 0, 0, 0, 0},	/* 7: Bipolar Full Step 1 */
    {5, 6, 10, 9, 0, 0, 0, 0, 0, 0},	/* 8: Bipoler Full Step 2 */
    {1, 3, 2, 6, 4, 12, 8, 9, 0, 0},	/* 9: Unipolar Half Step */
    {1, 5, 7, 6, 14, 10, 8, 9, 0, 0},	/* 10: Bipolar Half Step */
    {1, 2, 4, 8, 16, 0, 0, 0, 0, 0},	/* 11: Five Wire Unipolar */
    {3, 6, 12, 24, 17, 0, 0, 0, 0, 0},	/* 12: Five Wire Wave */
    {1, 3, 2, 6, 4, 12, 8, 24, 16, 17},	/* 13: Five Wire Uni Half */
    {3, 7, 6, 14, 12, 28, 24, 25, 17, 19},	/* 14: Five Wire Wave Half */
    {1, 2, 3, 4, 5, 6, 7, 0, 0, 0}	/* 15: CAA MODE */
};

static const unsigned char cycle_len_lut[] =
    { 4, 3, 6, 4, 4, 4, 4, 8, 8, 5, 5, 10, 10, 8 };

static const unsigned char num_phases_lut[] =
    { 2, 3, 3, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 3, };

#define MAX_STEP_TYPE 15

loadrt stepgen step_type=15,15,15

loadrt stepgen step_type=15,15,15 step_phases=3 step_cycle_len=8 step_phase_table 1,2,3,4,5,6,7,0