Tweaks for pins_BTT_SKR_common.h

Marlin/src/pins/lpc1768/pins_BTT_SKR_common.h

@@ -21,7 +21,7 @@
  */
 #pragma once
 
-#ifdef SKR_HAS_LPC1769
+#if ENABLED(SKR_HAS_LPC1769)
   #if NOT_TARGET(MCU_LPC1769)
     #error "Oops! Make sure you have the LPC1769 environment selected in your IDE."
   #endif
@@ -35,9 +35,9 @@
 
 #if BOTH(HAS_WIRED_LCD, HAS_BTT_EXP_MOT)
   #if EITHER(CR10_STOCKDISPLAY, ENDER2_STOCKDISPLAY)
-    #define EXP_MOT_USE_EXP2_ONLY
+    #define EXP_MOT_USE_EXP2_ONLY 1
   #else
-    #error "Having a LCD that uses both EXP1/EXP2 and a expanion motor module on EXP1/EXP2 is not possible."
+    #error "You can't use both an LCD and a Motor Expansion Module on EXP1/EXP2 at the same time."
   #endif
 #endif
 
@@ -146,7 +146,7 @@
   #define E2_STEP_PIN               EXPA2_05_PIN
   #define E2_DIR_PIN                EXPA2_06_PIN
   #define E2_ENABLE_PIN             EXPA2_04_PIN
-  #ifndef EXP_MOT_USE_EXP2_ONLY
+  #if !EXP_MOT_USE_EXP2_ONLY
     #define E2_DIAG_PIN             EXPA1_06_PIN
     #define E2_CS_PIN               EXPA1_05_PIN
     #if HAS_TMC_UART
@@ -158,7 +158,7 @@
   // M2 on Driver Expansion Module
   #define E3_STEP_PIN               EXPA2_08_PIN
   #define E3_DIR_PIN                EXPA2_07_PIN
-  #ifndef EXP_MOT_USE_EXP2_ONLY
+  #if !EXP_MOT_USE_EXP2_ONLY
     #define E3_ENABLE_PIN           EXPA1_03_PIN
     #define E3_DIAG_PIN             EXPA1_08_PIN
     #define E3_CS_PIN               EXPA1_07_PIN
@@ -173,7 +173,7 @@
   // M3 on Driver Expansion Module
   #define E4_STEP_PIN               EXPA2_10_PIN
   #define E4_DIR_PIN                EXPA2_09_PIN
-  #ifndef EXP_MOT_USE_EXP2_ONLY
+  #if !EXP_MOT_USE_EXP2_ONLY
     #define E4_ENABLE_PIN           EXPA1_04_PIN
     #define E4_DIAG_PIN             EXPA1_10_PIN
     #define E4_CS_PIN               EXPA1_09_PIN