Index: firmware/target/arm/sandisk/sansa-c200/lcd-c200.c
===================================================================
--- firmware/target/arm/sandisk/sansa-c200/lcd-c200.c	(revision 18040)
+++ firmware/target/arm/sandisk/sansa-c200/lcd-c200.c	(working copy)
@@ -185,8 +185,12 @@
 
 void lcd_set_invert_display(bool yesno)
 {
-    /* TODO: Implement lcd_set_invert_display() */
+#ifdef HAVE_LCD_INVERT
+    lcd_send_command(R_SPEC_DISPLAY_PATTERN);
+    lcd_send_command(yesno ? 1 : 0);
+#else
     (void)yesno;
+#endif
 }
 
 /* turn the display upside down (call lcd_update() afterwards) */