From eec0e00f8586e31ee7672f3557c3da5fbcb046d1 Mon Sep 17 00:00:00 2001
From: Markus Hitter <mah@jump-ing.de>
Date: Sun, 27 Nov 2016 20:38:31 +0100
Subject: [PATCH] dda_queue.c/.h: eliminate queue_current_movement().

Again no stepping performance improvement, but another 34 bytes
off the binary size:

  ATmega sizes               '168   '328(P)   '644(P)     '1280
  Program:  19364 bytes      136%       64%       31%       16%
     Data:   2179 bytes      213%      107%       54%       27%
   EEPROM:     32 bytes        4%        2%        2%        1%
---
 dda.c       |  4 +++-
 dda_queue.c | 14 --------------
 dda_queue.h |  1 -
 3 files changed, 3 insertions(+), 16 deletions(-)

diff --git a/dda.c b/dda.c
index e5bd515..92cf576 100644
--- a/dda.c
+++ b/dda.c
@@ -764,7 +764,9 @@ void dda_clock() {
   uint8_t current_id ;
   #endif
 
-  dda = queue_current_movement();
+  ATOMIC_START
+    dda = mb_tail_dda;
+  ATOMIC_END
   if (dda != last_dda) {
     move_state.debounce_count_x =
     move_state.debounce_count_z =
diff --git a/dda_queue.c b/dda_queue.c
index dd3486f..93ac376 100644
--- a/dda_queue.c
+++ b/dda_queue.c
@@ -51,20 +51,6 @@ uint8_t queue_full() {
   return MB_NEXT(mb_head) == mb_tail;
 }
 
-/// Return the current movement, or NULL, if there's no movement going on.
-DDA *queue_current_movement() {
-  DDA* current;
-
-  ATOMIC_START
-    current = &movebuffer[mb_tail];
-
-    if ( ! current->live)
-      current = NULL;
-  ATOMIC_END
-
-  return current;
-}
-
 // -------------------------------------------------------
 // This is the one function called by the timer interrupt.
 // It calls a few other functions, though.
diff --git a/dda_queue.h b/dda_queue.h
index b9943e0..888124b 100644
--- a/dda_queue.h
+++ b/dda_queue.h
@@ -22,7 +22,6 @@ extern DDA *mb_tail_dda;
 
 // queue status methods
 uint8_t queue_full(void);
-DDA *queue_current_movement(void);
 
 // take one step
 void queue_step(void);