Test patch for uint8_t

uint_fast8_t.patch

diff --git a/dda.c b/dda.c
index 421755f..2436a81 100644
--- a/dda.c
+++ b/dda.c
@@ -156,7 +156,7 @@ void dda_create(DDA *dda, const TARGET *target) {
   enum axis_e i;
   #ifdef LOOKAHEAD
   // Number the moves to identify them; allowed to overflow.
-  static uint8_t idcnt = 0;
+  static uint_fast8_t idcnt = 0;
   static DDA* prev_dda = NULL;
 
   if (prev_dda && prev_dda->done)
@@ -733,12 +733,12 @@ void dda_step(DDA *dda) {
 void dda_clock() {
   DDA *dda;
   static DDA *last_dda = NULL;
-  uint8_t endstop_trigger = 0;
+  uint_fast8_t endstop_trigger = 0;
   #ifdef ACCELERATION_RAMPING
   uint32_t move_step_no, move_c;
   int32_t move_n;
-  uint8_t recalc_speed;
-  uint8_t current_id ;
+  uint_fast8_t recalc_speed;
+  uint_fast8_t current_id ;
   #endif
 
   ATOMIC_START
diff --git a/dda.h b/dda.h
index a4bedae..af460bf 100644
--- a/dda.h
+++ b/dda.h
@@ -140,7 +140,7 @@ typedef struct {
   // Number the moves to be able to test at the end of lookahead if the moves
   // are the same. Note: we do not need a lot of granularity here: more than
   // MOVEBUFFER_SIZE is already enough.
-  uint8_t           id;
+  uint_fast8_t           id;
   #endif
 	#endif
 	#ifdef ACCELERATION_TEMPORAL
@@ -152,11 +152,11 @@ typedef struct {
   /// word boundaries only and fill smaller variables in between with gaps,
   /// so keep small variables grouped together to reduce the amount of these
   /// gaps. See e.g. NXP application note AN10963, page 10f.
-  uint8_t           fast_axis;       ///< number of the fast axis
+  uint_fast8_t           fast_axis;       ///< number of the fast axis
 
 	/// Endstop homing
-	uint8_t endstop_check; ///< Do we need to check endstops? 0x1=Check X, 0x2=Check Y, 0x4=Check Z
-	uint8_t endstop_stop_cond; ///< Endstop condition on which to stop motion: 0=Stop on detrigger, 1=Stop on trigger
+	uint_fast8_t endstop_check; ///< Do we need to check endstops? 0x1=Check X, 0x2=Check Y, 0x4=Check Z
+	uint_fast8_t endstop_stop_cond; ///< Endstop condition on which to stop motion: 0=Stop on detrigger, 1=Stop on trigger
 } DDA;
 
 /*