Index: firmware/target/arm/as3525/sansa-e200v2/button-e200v2.c
===================================================================
--- firmware/target/arm/as3525/sansa-e200v2/button-e200v2.c	(Revision 21183)
+++ firmware/target/arm/as3525/sansa-e200v2/button-e200v2.c	(Arbeitskopie)
@@ -65,9 +65,13 @@
      * BUTTON_REPEAT
      */
     static long last_wheel_post     = 0;
-    /* Repeat is used for the scrollwheel acceleration. If high enough then
-     * jump over some items */
-    static unsigned repeat          = 0;
+    /*
+     *  Providing wheel acceleration works as follows: We increment accel
+     * by 3 if the wheel was turned, and decrement it by 1 each tick
+     * (no matter if it was turned), that means: the longer and faster you turn,
+     * the higher accel will be. accel>>1 will actually posted to the button_queue
+     */ 	     
+    static unsigned accel          = 0;
     /* we omit 1 of 2 posts to the button_queue, that works better, so count */
     static int counter              = 0;
     /* Read wheel 
@@ -83,7 +87,7 @@
 
     if(hold_button)
     {
-        repeat  =  counter  = 0;
+        accel  =  counter  = 0;
         return;
     }
 
@@ -101,7 +105,7 @@
         {
             /* direction reversals nullify repeats */
             old_btn =  btn;
-            repeat  =  counter  = 0;
+            accel  =  counter  = 0;
         }
         /* wheel_delta will cause lists to jump over items,
          * we want this for fast scrolling, but we must keep it accurate
@@ -111,10 +115,10 @@
         if (TIME_BEFORE(current_tick, last_wheel_post + WHEEL_REPEAT_INTERVAL))
         {
             btn |= BUTTON_REPEAT;
-            wheel_delta = repeat>>1;
+            wheel_delta = accel>>1;
         }
 
-        repeat += 3;
+        accel += 3;
         /* the wheel is more reliable if we don't send ever change,
          * every 2th is basically one "physical click" is
          * 1 item in the rockbox menus */
@@ -128,13 +132,19 @@
             last_wheel_post = current_tick;
         }
     }
-    if (repeat > 0 && !read_missed)
-        repeat--;
+    if (accel > 0 && !read_missed)
+        accel--;
 
     old_wheel_value = wheel_value;
 }
 #endif /* !defined(BOOTLOADER) && defined(HAVE_SCROLLWHEEL) */
 
+static void button_delay(void)
+{
+    int i = 10;
+    while(i--) asm volatile ("nop\n");
+}
+
 unsigned short button_read_dbop(void)
 {
     /*write a red pixel */
@@ -145,18 +155,15 @@
     if (!read_missed)
     {
         /* Set up dbop for input */
-        while (!(DBOP_STAT & (1<<10)));      /* Wait for fifo to empty */
         DBOP_CTRL |= (1<<19);                /* Tri-state DBOP on read cycle */
         DBOP_CTRL &= ~(1<<16);               /* disable output (1:write enabled) */
         DBOP_TIMPOL_01 = 0xe167e167;         /* Set Timing & Polarity regs 0 & 1 */
         DBOP_TIMPOL_23 = 0xe167006e;         /* Set Timing & Polarity regs 2 & 3 */
-
+        
+        button_delay();
         DBOP_CTRL |= (1<<15);                /* start read */
         while (!(DBOP_STAT & (1<<16)));      /* wait for valid data */
 
-        int delay=10;
-        while(delay--);                      /* short delay before reading */
-
         _dbop_din = DBOP_DIN;                /* Read dbop data*/
 
         /* Reset dbop for output */