Toshiba Stepper Driver support

Tosh stepper drivers need to be driven slower, so the stepper code
was interleaved to separate the pin HIGH from the pin LOW. This adds
enough instructions to make it work, without needing nops.

Marlin/stepper.cpp

@@ -559,6 +559,58 @@ ISR(TIMER1_COMPA_vect)
       #endif //ADVANCE
 
         counter_x += current_block->steps_x;
+        #ifdef CONFIG_STEPPERS_TOSHIBA
+	/* The toshiba stepper controller require much longer pulses
+	 * tjerfore we 'stage' decompose the pulses between high, and
+	 * low instead of doing each in turn. The extra tests add enough
+	 * lag to allow it work with without needing NOPs */ 
+      if (counter_x > 0) {
+        WRITE(X_STEP_PIN, HIGH);
+      }
+
+      counter_y += current_block->steps_y;
+      if (counter_y > 0) {
+        WRITE(Y_STEP_PIN, HIGH);
+      }
+
+      counter_z += current_block->steps_z;
+      if (counter_z > 0) {
+        WRITE(Z_STEP_PIN, HIGH);
+      }
+
+      #ifndef ADVANCE
+        counter_e += current_block->steps_e;
+        if (counter_e > 0) {
+          WRITE_E_STEP(HIGH);
+        }
+      #endif //!ADVANCE
+
+      if (counter_x > 0) {
+        counter_x -= current_block->step_event_count;
+        count_position[X_AXIS]+=count_direction[X_AXIS];   
+        WRITE(X_STEP_PIN, LOW);
+      }
+
+      if (counter_y > 0) {
+        counter_y -= current_block->step_event_count;
+        count_position[Y_AXIS]+=count_direction[Y_AXIS];
+        WRITE(Y_STEP_PIN, LOW);
+      }
+
+      if (counter_z > 0) {
+        counter_z -= current_block->step_event_count;
+        count_position[Z_AXIS]+=count_direction[Z_AXIS];
+        WRITE(Z_STEP_PIN, LOW);
+      }
+
+      #ifndef ADVANCE
+        if (counter_e > 0) {
+          counter_e -= current_block->step_event_count;
+          count_position[E_AXIS]+=count_direction[E_AXIS];
+          WRITE_E_STEP(LOW);
+        }
+      #endif //!ADVANCE
+#else
         if (counter_x > 0) {
         #ifdef DUAL_X_CARRIAGE
           if (extruder_duplication_enabled){
@@ -635,6 +687,7 @@ ISR(TIMER1_COMPA_vect)
           WRITE_E_STEP(INVERT_E_STEP_PIN);
         }
       #endif //!ADVANCE
+      #endif
       step_events_completed += 1;
       if(step_events_completed >= current_block->step_event_count) break;
     }