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Index: firmware/target/arm/as3525/sansa-e200v2/lcd-e200v2.c
===================================================================
--- firmware/target/arm/as3525/sansa-e200v2/lcd-e200v2.c  (Revision 20040)
+++ firmware/target/arm/as3525/sansa-e200v2/lcd-e200v2.c  (Arbeitskopie)
@@ -435,7 +435,7 @@
 } /* lcd_update_rect */

 /* writes one read pixel outside the visible area, needed for correct dbop reads */
-void lcd_button_support(void)
+bool lcd_button_support(void)
 {
     int x=LCD_HEIGHT+1;
     int y=LCD_WIDTH+1;
@@ -444,7 +444,7 @@
     unsigned short data = (0xf<<12);

     if (lcd_busy)
-        return;
+        return false;

     lcd_write_reg(R_ENTRY_MODE, R_ENTRY_MODE_HORZ);
     /* Set start position and window */
@@ -457,4 +457,5 @@
     lcd_write_cmd(R_WRITE_DATA_2_GRAM);

     lcd_write_data(&data, width);
+    return true;
 }
Index: firmware/target/arm/as3525/sansa-e200v2/button-e200v2.c
===================================================================
--- firmware/target/arm/as3525/sansa-e200v2/button-e200v2.c  (Revision 20039)
+++ firmware/target/arm/as3525/sansa-e200v2/button-e200v2.c  (Arbeitskopie)
@@ -47,7 +47,7 @@
 static bool hold_button_old = false;
 #endif

-extern void lcd_button_support(void);
+extern bool lcd_button_support(void);

 void button_init_device(void)
 {
@@ -182,8 +182,10 @@

 int read_dbop(void)
 {
+    static int ret;
     /*write a red pixel */
-   lcd_button_support();
+    if (!lcd_button_support())
+        return ret;

   /* Set up dbop for input */
     while (!(DBOP_STAT & (1<<10)));     /* Wait for fifo to empty */
@@ -198,7 +200,7 @@
     int delay = 50;
     while(delay--);          /* small delay to set up read */

-    int ret = DBOP_DIN;     /* now read dbop & store info*/
+    ret = DBOP_DIN;     /* now read dbop & store info*/

     DBOP_TIMPOL_01 = 0x6e167;
     DBOP_TIMPOL_23 = 0xa167e06f;