Reorder Conditionals_post.h and add comments

Marlin/Conditionals_post.h

@@ -435,18 +435,100 @@
   /**
    * Shorthand for pin tests, used wherever needed
    */
+
+  // Steppers
+  #define HAS_X_ENABLE      (PIN_EXISTS(X_ENABLE))
+  #define HAS_X_DIR         (PIN_EXISTS(X_DIR))
+  #define HAS_X_STEP        (PIN_EXISTS(X_STEP))
+  #define HAS_X_MICROSTEPS  (PIN_EXISTS(X_MS1))
+
+  #define HAS_X2_ENABLE     (PIN_EXISTS(X2_ENABLE))
+  #define HAS_X2_DIR        (PIN_EXISTS(X2_DIR))
+  #define HAS_X2_STEP       (PIN_EXISTS(X2_STEP))
+  #define HAS_Y_MICROSTEPS  (PIN_EXISTS(Y_MS1))
+
+  #define HAS_Y_ENABLE      (PIN_EXISTS(Y_ENABLE))
+  #define HAS_Y_DIR         (PIN_EXISTS(Y_DIR))
+  #define HAS_Y_STEP        (PIN_EXISTS(Y_STEP))
+  #define HAS_Z_MICROSTEPS  (PIN_EXISTS(Z_MS1))
+
+  #define HAS_Y2_ENABLE     (PIN_EXISTS(Y2_ENABLE))
+  #define HAS_Y2_DIR        (PIN_EXISTS(Y2_DIR))
+  #define HAS_Y2_STEP       (PIN_EXISTS(Y2_STEP))
+
+  #define HAS_Z_ENABLE      (PIN_EXISTS(Z_ENABLE))
+  #define HAS_Z_DIR         (PIN_EXISTS(Z_DIR))
+  #define HAS_Z_STEP        (PIN_EXISTS(Z_STEP))
+
+  #define HAS_Z2_ENABLE     (PIN_EXISTS(Z2_ENABLE))
+  #define HAS_Z2_DIR        (PIN_EXISTS(Z2_DIR))
+  #define HAS_Z2_STEP       (PIN_EXISTS(Z2_STEP))
+
+  // Extruder steppers and solenoids
+  #define HAS_E0_ENABLE     (PIN_EXISTS(E0_ENABLE))
+  #define HAS_E0_DIR        (PIN_EXISTS(E0_DIR))
+  #define HAS_E0_STEP       (PIN_EXISTS(E0_STEP))
+  #define HAS_E0_MICROSTEPS (PIN_EXISTS(E0_MS1))
+  #define HAS_SOLENOID_0    (PIN_EXISTS(SOL0))
+
+  #define HAS_E1_ENABLE     (PIN_EXISTS(E1_ENABLE))
+  #define HAS_E1_DIR        (PIN_EXISTS(E1_DIR))
+  #define HAS_E1_STEP       (PIN_EXISTS(E1_STEP))
+  #define HAS_E1_MICROSTEPS (PIN_EXISTS(E1_MS1))
+  #define HAS_SOLENOID_1    (PIN_EXISTS(SOL1))
+
+  #define HAS_E2_ENABLE     (PIN_EXISTS(E2_ENABLE))
+  #define HAS_E2_DIR        (PIN_EXISTS(E2_DIR))
+  #define HAS_E2_STEP       (PIN_EXISTS(E2_STEP))
+  #define HAS_E2_MICROSTEPS (PIN_EXISTS(E2_MS1))
+  #define HAS_SOLENOID_2    (PIN_EXISTS(SOL2))
+
+  #define HAS_E3_ENABLE     (PIN_EXISTS(E3_ENABLE))
+  #define HAS_E3_DIR        (PIN_EXISTS(E3_DIR))
+  #define HAS_E3_STEP       (PIN_EXISTS(E3_STEP))
+  #define HAS_E3_MICROSTEPS (PIN_EXISTS(E3_MS1))
+  #define HAS_SOLENOID_3    (PIN_EXISTS(SOL3))
+
+  #define HAS_E4_ENABLE     (PIN_EXISTS(E4_ENABLE))
+  #define HAS_E4_DIR        (PIN_EXISTS(E4_DIR))
+  #define HAS_E4_STEP       (PIN_EXISTS(E4_STEP))
+  #define HAS_E4_MICROSTEPS (PIN_EXISTS(E4_MS1))
+  #define HAS_SOLENOID_4    (PIN_EXISTS(SOL4))
+
+  // Endstops and bed probe
+  #define HAS_X_MIN (PIN_EXISTS(X_MIN) && !IS_Z2_OR_PROBE(X_MIN_PIN))
+  #define HAS_X_MAX (PIN_EXISTS(X_MAX) && !IS_Z2_OR_PROBE(X_MAX_PIN))
+  #define HAS_Y_MIN (PIN_EXISTS(Y_MIN) && !IS_Z2_OR_PROBE(Y_MIN_PIN))
+  #define HAS_Y_MAX (PIN_EXISTS(Y_MAX) && !IS_Z2_OR_PROBE(Y_MAX_PIN))
+  #define HAS_Z_MIN (PIN_EXISTS(Z_MIN) && !IS_Z2_OR_PROBE(Z_MIN_PIN))
+  #define HAS_Z_MAX (PIN_EXISTS(Z_MAX) && !IS_Z2_OR_PROBE(Z_MAX_PIN))
+  #define HAS_Z2_MIN (PIN_EXISTS(Z2_MIN))
+  #define HAS_Z2_MAX (PIN_EXISTS(Z2_MAX))
+  #define HAS_Z_MIN_PROBE_PIN (PIN_EXISTS(Z_MIN_PROBE))
+
+  // Thermistors
   #define HAS_TEMP_0 (PIN_EXISTS(TEMP_0) && TEMP_SENSOR_0 != 0 && TEMP_SENSOR_0 > -2)
   #define HAS_TEMP_1 (PIN_EXISTS(TEMP_1) && TEMP_SENSOR_1 != 0 && TEMP_SENSOR_1 > -2)
   #define HAS_TEMP_2 (PIN_EXISTS(TEMP_2) && TEMP_SENSOR_2 != 0 && TEMP_SENSOR_2 > -2)
   #define HAS_TEMP_3 (PIN_EXISTS(TEMP_3) && TEMP_SENSOR_3 != 0 && TEMP_SENSOR_3 > -2)
   #define HAS_TEMP_4 (PIN_EXISTS(TEMP_4) && TEMP_SENSOR_4 != 0 && TEMP_SENSOR_4 > -2)
+  #define HAS_TEMP_HOTEND (HAS_TEMP_0 || ENABLED(HEATER_0_USES_MAX6675))
   #define HAS_TEMP_BED (PIN_EXISTS(TEMP_BED) && TEMP_SENSOR_BED != 0 && TEMP_SENSOR_BED > -2)
+
+  // Heaters
   #define HAS_HEATER_0 (PIN_EXISTS(HEATER_0))
   #define HAS_HEATER_1 (PIN_EXISTS(HEATER_1))
   #define HAS_HEATER_2 (PIN_EXISTS(HEATER_2))
   #define HAS_HEATER_3 (PIN_EXISTS(HEATER_3))
   #define HAS_HEATER_4 (PIN_EXISTS(HEATER_4))
   #define HAS_HEATER_BED (PIN_EXISTS(HEATER_BED))
+
+  // Thermal protection
+  #define HAS_THERMALLY_PROTECTED_BED (ENABLED(THERMAL_PROTECTION_BED) && HAS_TEMP_BED && HAS_HEATER_BED)
+  #define WATCH_HOTENDS (ENABLED(THERMAL_PROTECTION_HOTENDS) && WATCH_TEMP_PERIOD > 0)
+  #define WATCH_THE_BED (HAS_THERMALLY_PROTECTED_BED && WATCH_BED_TEMP_PERIOD > 0)
+
+  // Auto fans
   #define HAS_AUTO_FAN_0 (PIN_EXISTS(E0_AUTO_FAN))
   #define HAS_AUTO_FAN_1 (HOTENDS > 1 && PIN_EXISTS(E1_AUTO_FAN))
   #define HAS_AUTO_FAN_2 (HOTENDS > 2 && PIN_EXISTS(E2_AUTO_FAN))
@@ -463,91 +545,38 @@
   #define AUTO_4_IS_1 (E4_AUTO_FAN_PIN == E1_AUTO_FAN_PIN)
   #define AUTO_4_IS_2 (E4_AUTO_FAN_PIN == E2_AUTO_FAN_PIN)
   #define AUTO_4_IS_3 (E4_AUTO_FAN_PIN == E3_AUTO_FAN_PIN)
+
+  // Other fans
   #define HAS_FAN0 (PIN_EXISTS(FAN))
   #define HAS_FAN1 (PIN_EXISTS(FAN1) && CONTROLLERFAN_PIN != FAN1_PIN && E0_AUTO_FAN_PIN != FAN1_PIN && E1_AUTO_FAN_PIN != FAN1_PIN && E2_AUTO_FAN_PIN != FAN1_PIN && E3_AUTO_FAN_PIN != FAN1_PIN)
   #define HAS_FAN2 (PIN_EXISTS(FAN2) && CONTROLLERFAN_PIN != FAN2_PIN && E0_AUTO_FAN_PIN != FAN2_PIN && E1_AUTO_FAN_PIN != FAN2_PIN && E2_AUTO_FAN_PIN != FAN2_PIN && E3_AUTO_FAN_PIN != FAN2_PIN)
   #define HAS_CONTROLLERFAN (PIN_EXISTS(CONTROLLERFAN))
+
+  // Servos
   #define HAS_SERVOS (defined(NUM_SERVOS) && NUM_SERVOS > 0)
   #define HAS_SERVO_0 (PIN_EXISTS(SERVO0))
   #define HAS_SERVO_1 (PIN_EXISTS(SERVO1))
   #define HAS_SERVO_2 (PIN_EXISTS(SERVO2))
   #define HAS_SERVO_3 (PIN_EXISTS(SERVO3))
+
+  // Sensors
   #define HAS_FILAMENT_WIDTH_SENSOR (PIN_EXISTS(FILWIDTH))
   #define HAS_FIL_RUNOUT (PIN_EXISTS(FIL_RUNOUT))
+
+  // User Interface
   #define HAS_HOME (PIN_EXISTS(HOME))
   #define HAS_KILL (PIN_EXISTS(KILL))
   #define HAS_SUICIDE (PIN_EXISTS(SUICIDE))
   #define HAS_PHOTOGRAPH (PIN_EXISTS(PHOTOGRAPH))
-  #define HAS_X_MIN (PIN_EXISTS(X_MIN) && !IS_Z2_OR_PROBE(X_MIN_PIN))
-  #define HAS_X_MAX (PIN_EXISTS(X_MAX) && !IS_Z2_OR_PROBE(X_MAX_PIN))
-  #define HAS_Y_MIN (PIN_EXISTS(Y_MIN) && !IS_Z2_OR_PROBE(Y_MIN_PIN))
-  #define HAS_Y_MAX (PIN_EXISTS(Y_MAX) && !IS_Z2_OR_PROBE(Y_MAX_PIN))
-  #define HAS_Z_MIN (PIN_EXISTS(Z_MIN) && !IS_Z2_OR_PROBE(Z_MIN_PIN))
-  #define HAS_Z_MAX (PIN_EXISTS(Z_MAX) && !IS_Z2_OR_PROBE(Z_MAX_PIN))
-  #define HAS_Z2_MIN (PIN_EXISTS(Z2_MIN))
-  #define HAS_Z2_MAX (PIN_EXISTS(Z2_MAX))
-  #define HAS_Z_MIN_PROBE_PIN (PIN_EXISTS(Z_MIN_PROBE))
-  #define HAS_SOLENOID_0 (PIN_EXISTS(SOL0))
-  #define HAS_SOLENOID_1 (PIN_EXISTS(SOL1))
-  #define HAS_SOLENOID_2 (PIN_EXISTS(SOL2))
-  #define HAS_SOLENOID_3 (PIN_EXISTS(SOL3))
-  #define HAS_SOLENOID_4 (PIN_EXISTS(SOL4))
-  #define HAS_MICROSTEPS_X (PIN_EXISTS(X_MS1))
-  #define HAS_MICROSTEPS_Y (PIN_EXISTS(Y_MS1))
-  #define HAS_MICROSTEPS_Z (PIN_EXISTS(Z_MS1))
-  #define HAS_MICROSTEPS_E0 (PIN_EXISTS(E0_MS1))
-  #define HAS_MICROSTEPS_E1 (PIN_EXISTS(E1_MS1))
-  #define HAS_MICROSTEPS_E2 (PIN_EXISTS(E2_MS1))
-  #define HAS_MICROSTEPS_E3 (PIN_EXISTS(E3_MS1))
-  #define HAS_MICROSTEPS_E4 (PIN_EXISTS(E4_MS1))
-  #define HAS_MICROSTEPS (HAS_MICROSTEPS_X || HAS_MICROSTEPS_Y || HAS_MICROSTEPS_Z || HAS_MICROSTEPS_E0 || HAS_MICROSTEPS_E1 || HAS_MICROSTEPS_E2)
-  #define HAS_STEPPER_RESET (PIN_EXISTS(STEPPER_RESET))
-  #define HAS_X_ENABLE (PIN_EXISTS(X_ENABLE))
-  #define HAS_X2_ENABLE (PIN_EXISTS(X2_ENABLE))
-  #define HAS_Y_ENABLE (PIN_EXISTS(Y_ENABLE))
-  #define HAS_Y2_ENABLE (PIN_EXISTS(Y2_ENABLE))
-  #define HAS_Z_ENABLE (PIN_EXISTS(Z_ENABLE))
-  #define HAS_Z2_ENABLE (PIN_EXISTS(Z2_ENABLE))
-  #define HAS_E0_ENABLE (PIN_EXISTS(E0_ENABLE))
-  #define HAS_E1_ENABLE (PIN_EXISTS(E1_ENABLE))
-  #define HAS_E2_ENABLE (PIN_EXISTS(E2_ENABLE))
-  #define HAS_E3_ENABLE (PIN_EXISTS(E3_ENABLE))
-  #define HAS_E4_ENABLE (PIN_EXISTS(E4_ENABLE))
-  #define HAS_X_DIR (PIN_EXISTS(X_DIR))
-  #define HAS_X2_DIR (PIN_EXISTS(X2_DIR))
-  #define HAS_Y_DIR (PIN_EXISTS(Y_DIR))
-  #define HAS_Y2_DIR (PIN_EXISTS(Y2_DIR))
-  #define HAS_Z_DIR (PIN_EXISTS(Z_DIR))
-  #define HAS_Z2_DIR (PIN_EXISTS(Z2_DIR))
-  #define HAS_E0_DIR (PIN_EXISTS(E0_DIR))
-  #define HAS_E1_DIR (PIN_EXISTS(E1_DIR))
-  #define HAS_E2_DIR (PIN_EXISTS(E2_DIR))
-  #define HAS_E3_DIR (PIN_EXISTS(E3_DIR))
-  #define HAS_E4_DIR (PIN_EXISTS(E4_DIR))
-  #define HAS_X_STEP (PIN_EXISTS(X_STEP))
-  #define HAS_X2_STEP (PIN_EXISTS(X2_STEP))
-  #define HAS_Y_STEP (PIN_EXISTS(Y_STEP))
-  #define HAS_Y2_STEP (PIN_EXISTS(Y2_STEP))
-  #define HAS_Z_STEP (PIN_EXISTS(Z_STEP))
-  #define HAS_Z2_STEP (PIN_EXISTS(Z2_STEP))
-  #define HAS_E0_STEP (PIN_EXISTS(E0_STEP))
-  #define HAS_E1_STEP (PIN_EXISTS(E1_STEP))
-  #define HAS_E2_STEP (PIN_EXISTS(E2_STEP))
-  #define HAS_E3_STEP (PIN_EXISTS(E3_STEP))
-  #define HAS_E4_STEP (PIN_EXISTS(E4_STEP))
-  #define HAS_DIGIPOTSS (PIN_EXISTS(DIGIPOTSS))
   #define HAS_BUZZER (PIN_EXISTS(BEEPER) || ENABLED(LCD_USE_I2C_BUZZER))
   #define HAS_CASE_LIGHT (PIN_EXISTS(CASE_LIGHT))
 
+  // Digital control
+  #define HAS_MICROSTEPS (HAS_X_MICROSTEPS || HAS_Y_MICROSTEPS || HAS_Z_MICROSTEPS || HAS_E0_MICROSTEPS || HAS_E1_MICROSTEPS || HAS_E2_MICROSTEPS || HAS_E3_MICROSTEPS || HAS_E4_MICROSTEPS)
+  #define HAS_STEPPER_RESET (PIN_EXISTS(STEPPER_RESET))
+  #define HAS_DIGIPOTSS (PIN_EXISTS(DIGIPOTSS))
   #define HAS_MOTOR_CURRENT_PWM (PIN_EXISTS(MOTOR_CURRENT_PWM_XY) || PIN_EXISTS(MOTOR_CURRENT_PWM_Z) || PIN_EXISTS(MOTOR_CURRENT_PWM_E))
 
-  #define HAS_TEMP_HOTEND (HAS_TEMP_0 || ENABLED(HEATER_0_USES_MAX6675))
-
-  #define HAS_THERMALLY_PROTECTED_BED (HAS_TEMP_BED && HAS_HEATER_BED && ENABLED(THERMAL_PROTECTION_BED))
-
-  #define WATCH_HOTENDS (ENABLED(THERMAL_PROTECTION_HOTENDS) && WATCH_TEMP_PERIOD > 0)
-  #define WATCH_THE_BED (HAS_THERMALLY_PROTECTED_BED && WATCH_BED_TEMP_PERIOD > 0)
-
   /**
    * This setting is also used by M109 when trying to calculate
    * a ballpark safe margin to prevent wait-forever situation.

Marlin/stepper.cpp

@@ -1464,31 +1464,31 @@ void Stepper::report_positions() {
   void Stepper::microstep_init() {
     SET_OUTPUT(X_MS1_PIN);
     SET_OUTPUT(X_MS2_PIN);
-    #if HAS_MICROSTEPS_Y
+    #if HAS_Y_MICROSTEPS
       SET_OUTPUT(Y_MS1_PIN);
       SET_OUTPUT(Y_MS2_PIN);
     #endif
-    #if HAS_MICROSTEPS_Z
+    #if HAS_Z_MICROSTEPS
       SET_OUTPUT(Z_MS1_PIN);
       SET_OUTPUT(Z_MS2_PIN);
     #endif
-    #if HAS_MICROSTEPS_E0
+    #if HAS_E0_MICROSTEPS
       SET_OUTPUT(E0_MS1_PIN);
       SET_OUTPUT(E0_MS2_PIN);
     #endif
-    #if HAS_MICROSTEPS_E1
+    #if HAS_E1_MICROSTEPS
       SET_OUTPUT(E1_MS1_PIN);
       SET_OUTPUT(E1_MS2_PIN);
     #endif
-    #if HAS_MICROSTEPS_E2
+    #if HAS_E2_MICROSTEPS
       SET_OUTPUT(E2_MS1_PIN);
       SET_OUTPUT(E2_MS2_PIN);
     #endif
-    #if HAS_MICROSTEPS_E3
+    #if HAS_E3_MICROSTEPS
       SET_OUTPUT(E3_MS1_PIN);
       SET_OUTPUT(E3_MS2_PIN);
     #endif
-    #if HAS_MICROSTEPS_E4
+    #if HAS_E4_MICROSTEPS
       SET_OUTPUT(E4_MS1_PIN);
       SET_OUTPUT(E4_MS2_PIN);
     #endif
@@ -1500,49 +1500,49 @@ void Stepper::report_positions() {
   void Stepper::microstep_ms(uint8_t driver, int8_t ms1, int8_t ms2) {
     if (ms1 >= 0) switch (driver) {
       case 0: WRITE(X_MS1_PIN, ms1); break;
-      #if HAS_MICROSTEPS_Y
+      #if HAS_Y_MICROSTEPS
         case 1: WRITE(Y_MS1_PIN, ms1); break;
       #endif
-      #if HAS_MICROSTEPS_Z
+      #if HAS_Z_MICROSTEPS
         case 2: WRITE(Z_MS1_PIN, ms1); break;
       #endif
-      #if HAS_MICROSTEPS_E0
+      #if HAS_E0_MICROSTEPS
         case 3: WRITE(E0_MS1_PIN, ms1); break;
       #endif
-      #if HAS_MICROSTEPS_E1
+      #if HAS_E1_MICROSTEPS
         case 4: WRITE(E1_MS1_PIN, ms1); break;
       #endif
-      #if HAS_MICROSTEPS_E2
+      #if HAS_E2_MICROSTEPS
         case 5: WRITE(E2_MS1_PIN, ms1); break;
       #endif
-      #if HAS_MICROSTEPS_E3
+      #if HAS_E3_MICROSTEPS
         case 6: WRITE(E3_MS1_PIN, ms1); break;
       #endif
-      #if HAS_MICROSTEPS_E4
+      #if HAS_E4_MICROSTEPS
         case 7: WRITE(E4_MS1_PIN, ms1); break;
       #endif
     }
     if (ms2 >= 0) switch (driver) {
       case 0: WRITE(X_MS2_PIN, ms2); break;
-      #if HAS_MICROSTEPS_Y
+      #if HAS_Y_MICROSTEPS
         case 1: WRITE(Y_MS2_PIN, ms2); break;
       #endif
-      #if HAS_MICROSTEPS_Z
+      #if HAS_Z_MICROSTEPS
         case 2: WRITE(Z_MS2_PIN, ms2); break;
       #endif
-      #if HAS_MICROSTEPS_E0
+      #if HAS_E0_MICROSTEPS
         case 3: WRITE(E0_MS2_PIN, ms2); break;
       #endif
-      #if HAS_MICROSTEPS_E1
+      #if HAS_E1_MICROSTEPS
         case 4: WRITE(E1_MS2_PIN, ms2); break;
       #endif
-      #if HAS_MICROSTEPS_E2
+      #if HAS_E2_MICROSTEPS
         case 5: WRITE(E2_MS2_PIN, ms2); break;
       #endif
-      #if HAS_MICROSTEPS_E3
+      #if HAS_E3_MICROSTEPS
         case 6: WRITE(E3_MS2_PIN, ms2); break;
       #endif
-      #if HAS_MICROSTEPS_E4
+      #if HAS_E4_MICROSTEPS
         case 7: WRITE(E4_MS2_PIN, ms2); break;
       #endif
     }
@@ -1563,37 +1563,37 @@ void Stepper::report_positions() {
     SERIAL_PROTOCOLPGM("X: ");
     SERIAL_PROTOCOL(READ(X_MS1_PIN));
     SERIAL_PROTOCOLLN(READ(X_MS2_PIN));
-    #if HAS_MICROSTEPS_Y
+    #if HAS_Y_MICROSTEPS
       SERIAL_PROTOCOLPGM("Y: ");
       SERIAL_PROTOCOL(READ(Y_MS1_PIN));
       SERIAL_PROTOCOLLN(READ(Y_MS2_PIN));
     #endif
-    #if HAS_MICROSTEPS_Z
+    #if HAS_Z_MICROSTEPS
       SERIAL_PROTOCOLPGM("Z: ");
       SERIAL_PROTOCOL(READ(Z_MS1_PIN));
       SERIAL_PROTOCOLLN(READ(Z_MS2_PIN));
     #endif
-    #if HAS_MICROSTEPS_E0
+    #if HAS_E0_MICROSTEPS
       SERIAL_PROTOCOLPGM("E0: ");
       SERIAL_PROTOCOL(READ(E0_MS1_PIN));
       SERIAL_PROTOCOLLN(READ(E0_MS2_PIN));
     #endif
-    #if HAS_MICROSTEPS_E1
+    #if HAS_E1_MICROSTEPS
       SERIAL_PROTOCOLPGM("E1: ");
       SERIAL_PROTOCOL(READ(E1_MS1_PIN));
       SERIAL_PROTOCOLLN(READ(E1_MS2_PIN));
     #endif
-    #if HAS_MICROSTEPS_E2
+    #if HAS_E2_MICROSTEPS
       SERIAL_PROTOCOLPGM("E2: ");
       SERIAL_PROTOCOL(READ(E2_MS1_PIN));
       SERIAL_PROTOCOLLN(READ(E2_MS2_PIN));
     #endif
-    #if HAS_MICROSTEPS_E3
+    #if HAS_E3_MICROSTEPS
       SERIAL_PROTOCOLPGM("E3: ");
       SERIAL_PROTOCOL(READ(E3_MS1_PIN));
       SERIAL_PROTOCOLLN(READ(E3_MS2_PIN));
     #endif
-    #if HAS_MICROSTEPS_E4
+    #if HAS_E4_MICROSTEPS
       SERIAL_PROTOCOLPGM("E4: ");
       SERIAL_PROTOCOL(READ(E4_MS1_PIN));
       SERIAL_PROTOCOLLN(READ(E4_MS2_PIN));