Some suggested changes for #1555

Marlin/Marlin_main.cpp

 void setup_photpin()
 {
   #if defined(PHOTOGRAPH_PIN) && PHOTOGRAPH_PIN > -1
-    SET_OUTPUT(PHOTOGRAPH_PIN);
-    WRITE(PHOTOGRAPH_PIN, LOW);
+    OUT_WRITE(PHOTOGRAPH_PIN, LOW);
   #endif
 }
 
 void setup_powerhold()
 {
   #if defined(SUICIDE_PIN) && SUICIDE_PIN > -1
-    SET_OUTPUT(SUICIDE_PIN);
-    WRITE(SUICIDE_PIN, HIGH);
+    OUT_WRITE(SUICIDE_PIN, HIGH);
   #endif
   #if defined(PS_ON_PIN) && PS_ON_PIN > -1
-    SET_OUTPUT(PS_ON_PIN);
-	#if defined(PS_DEFAULT_OFF)
-	  WRITE(PS_ON_PIN, PS_ON_ASLEEP);
-    #else
-	  WRITE(PS_ON_PIN, PS_ON_AWAKE);
-	#endif
+    #if defined(PS_DEFAULT_OFF)
+      OUT_WRITE(PS_ON_PIN, PS_ON_ASLEEP);
+      #else
+      OUT_WRITE(PS_ON_PIN, PS_ON_AWAKE);
+    #endif
   #endif
 }
 
 void suicide()
 {
   #if defined(SUICIDE_PIN) && SUICIDE_PIN > -1
-    SET_OUTPUT(SUICIDE_PIN);
-    WRITE(SUICIDE_PIN, LOW);
+    OUT_WRITE(SUICIDE_PIN, LOW);
   #endif
 }
 
 
     #if defined(PS_ON_PIN) && PS_ON_PIN > -1
       case 80: // M80 - Turn on Power Supply
-        SET_OUTPUT(PS_ON_PIN); //GND
-        WRITE(PS_ON_PIN, PS_ON_AWAKE);
+        OUT_WRITE(PS_ON_PIN, PS_ON_AWAKE); // GND
 
         // If you have a switch on suicide pin, this is useful
         // if you want to start another print with suicide feature after
         // a print without suicide...
         #if defined SUICIDE_PIN && SUICIDE_PIN > -1
-            SET_OUTPUT(SUICIDE_PIN);
-            WRITE(SUICIDE_PIN, HIGH);
+            OUT_WRITE(SUICIDE_PIN, HIGH);
         #endif
 
         #ifdef ULTIPANEL
         st_synchronize();
         suicide();
       #elif defined(PS_ON_PIN) && PS_ON_PIN > -1
-        SET_OUTPUT(PS_ON_PIN);
-        WRITE(PS_ON_PIN, PS_ON_ASLEEP);
+        OUT_WRITE(PS_ON_PIN, PS_ON_ASLEEP);
       #endif
       #ifdef ULTIPANEL
         powersupply = false;
          SERIAL_ECHO(extruder_offset[Z_AXIS][tmp_extruder]);
       #endif
       }
-      SERIAL_ECHOLN("");
+      SERIAL_EOL;
     }break;
     #endif
     case 220: // M220 S<factor in percent>- set speed factor override percentage
      {
      	#ifdef CHDK
        
-         SET_OUTPUT(CHDK);
-         WRITE(CHDK, HIGH);
+         OUT_WRITE(CHDK, HIGH);
          chdkHigh = millis();
          chdkActive = true;
        
           if(cnt==0)
           {
           #if BEEPER > 0
-            SET_OUTPUT(BEEPER);
-
-            WRITE(BEEPER,HIGH);
+            OUT_WRITE(BEEPER,HIGH);
             delay(3);
             WRITE(BEEPER,LOW);
             delay(3);
 }
 
 #ifdef EXT_SOLENOID
+
 void enable_solenoid(uint8_t num) {
-         if(num == 0) {
-         SET_OUTPUT(SOL0_PIN);
-         WRITE(SOL0_PIN,HIGH);
-    }
-        
-         if(num == 1){
-         SET_OUTPUT(SOL1_PIN);
-         WRITE(SOL1_PIN,HIGH);
-    }
-         
-         if(num == 2){
-         SET_OUTPUT(SOL2_PIN);
-         WRITE(SOL2_PIN,HIGH);
-    }
-         
-         if(num == 3){
-         SET_OUTPUT(SOL3_PIN);
-         WRITE(SOL3_PIN,HIGH);
-    }
-         
-         return;
-    }
+  switch(num) {
+    case 0:
+      OUT_WRITE(SOL0_PIN, HIGH);
+      break;
+      #if defined(SOL1_PIN) && SOL1_PIN > -1
+        case 1:
+          OUT_WRITE(SOL1_PIN, HIGH);
+          break;
+      #endif
+      #if defined(SOL2_PIN) && SOL2_PIN > -1
+        case 2:
+          OUT_WRITE(SOL2_PIN, HIGH);
+          break;
+      #endif
+      #if defined(SOL3_PIN) && SOL3_PIN > -1
+        case 3:
+          OUT_WRITE(SOL3_PIN, HIGH);
+          break;
+      #endif
+    default:
+      SERIAL_ECHO_START;
+      SERIAL_ECHOLNPGM(MSG_INVALID_SOLENOID);
+      break;
+  }
+}
 
-void enable_solenoid_on_active_extruder() {
-         enable_solenoid(active_extruder);
-         return;
-    }
+void enable_solenoid_on_active_extruder() { enable_solenoid(active_extruder); }
 
 void disable_all_solenoids() {
-         SET_OUTPUT(SOL0_PIN);
-         SET_OUTPUT(SOL1_PIN);
-         SET_OUTPUT(SOL2_PIN);
-         SET_OUTPUT(SOL3_PIN);
-         
-         WRITE(SOL0_PIN,LOW);
-         WRITE(SOL1_PIN,LOW);
-         WRITE(SOL2_PIN,LOW);
-         WRITE(SOL3_PIN,LOW);
-         
-         return;
-    }
+  OUT_WRITE(SOL0_PIN, LOW);
+  OUT_WRITE(SOL1_PIN, LOW);
+  OUT_WRITE(SOL2_PIN, LOW);
+  OUT_WRITE(SOL3_PIN, LOW);
+}
 
 #endif //EXT_SOLENOID

Marlin/cardreader.cpp

   autostart_index = 0;
   //power to SD reader
   #if SDPOWER > -1
-    SET_OUTPUT(SDPOWER);
-    WRITE(SDPOWER, HIGH);
+    OUT_WRITE(SDPOWER, HIGH);
   #endif //SDPOWER
 
   autostart_atmillis = millis() + 5000;

Marlin/fastio.h

 /// check if pin is an timer wrapper
 #define GET_TIMER(IO)  _GET_TIMER(IO)
 
+// Shorthand
+#define OUT_WRITE(IO, v) { SET_OUTPUT(IO); WRITE(IO, v); }
+
 /*
 	ports and functions
 

Marlin/language.h

 #define MSG_UNKNOWN_COMMAND                 "Unknown command: \""
 #define MSG_ACTIVE_EXTRUDER                 "Active Extruder: "
 #define MSG_INVALID_EXTRUDER                "Invalid extruder"
+#define MSG_INVALID_SOLENOID                "Invalid solenoid"
 #define MSG_X_MIN                           "x_min: "
 #define MSG_X_MAX                           "x_max: "
 #define MSG_Y_MIN                           "y_min: "

Marlin/stepper.cpp

      SERIAL_ECHOPAIR(" Z:",(float)endstops_trigsteps[Z_AXIS]/axis_steps_per_unit[Z_AXIS]);
      LCD_MESSAGEPGM(MSG_ENDSTOPS_HIT "Z");
    }
-   SERIAL_ECHOLN("");
+   SERIAL_EOL;
    endstop_x_hit=false;
    endstop_y_hit=false;
    endstop_z_hit=false;
 
   //Initialize Step Pins
   #if defined(X_STEP_PIN) && (X_STEP_PIN > -1)
-    SET_OUTPUT(X_STEP_PIN);
-    WRITE(X_STEP_PIN,INVERT_X_STEP_PIN);
+    OUT_WRITE(X_STEP_PIN,INVERT_X_STEP_PIN);
     disable_x();
   #endif
   #if defined(X2_STEP_PIN) && (X2_STEP_PIN > -1)
-    SET_OUTPUT(X2_STEP_PIN);
-    WRITE(X2_STEP_PIN,INVERT_X_STEP_PIN);
+    OUT_WRITE(X2_STEP_PIN,INVERT_X_STEP_PIN);
     disable_x();
   #endif
   #if defined(Y_STEP_PIN) && (Y_STEP_PIN > -1)
-    SET_OUTPUT(Y_STEP_PIN);
-    WRITE(Y_STEP_PIN,INVERT_Y_STEP_PIN);
+    OUT_WRITE(Y_STEP_PIN,INVERT_Y_STEP_PIN);
     #if defined(Y_DUAL_STEPPER_DRIVERS) && defined(Y2_STEP_PIN) && (Y2_STEP_PIN > -1)
-      SET_OUTPUT(Y2_STEP_PIN);
-      WRITE(Y2_STEP_PIN,INVERT_Y_STEP_PIN);
+      OUT_WRITE(Y2_STEP_PIN,INVERT_Y_STEP_PIN);
     #endif
     disable_y();
   #endif
   #if defined(Z_STEP_PIN) && (Z_STEP_PIN > -1)
-    SET_OUTPUT(Z_STEP_PIN);
-    WRITE(Z_STEP_PIN,INVERT_Z_STEP_PIN);
+    OUT_WRITE(Z_STEP_PIN,INVERT_Z_STEP_PIN);
     #if defined(Z_DUAL_STEPPER_DRIVERS) && defined(Z2_STEP_PIN) && (Z2_STEP_PIN > -1)
-      SET_OUTPUT(Z2_STEP_PIN);
-      WRITE(Z2_STEP_PIN,INVERT_Z_STEP_PIN);
+      OUT_WRITE(Z2_STEP_PIN,INVERT_Z_STEP_PIN);
     #endif
     disable_z();
   #endif
   #if defined(E0_STEP_PIN) && (E0_STEP_PIN > -1)
-    SET_OUTPUT(E0_STEP_PIN);
-    WRITE(E0_STEP_PIN,INVERT_E_STEP_PIN);
+    OUT_WRITE(E0_STEP_PIN,INVERT_E_STEP_PIN);
     disable_e0();
   #endif
   #if defined(E1_STEP_PIN) && (E1_STEP_PIN > -1)
-    SET_OUTPUT(E1_STEP_PIN);
-    WRITE(E1_STEP_PIN,INVERT_E_STEP_PIN);
+    OUT_WRITE(E1_STEP_PIN,INVERT_E_STEP_PIN);
     disable_e1();
   #endif
   #if defined(E2_STEP_PIN) && (E2_STEP_PIN > -1)
-    SET_OUTPUT(E2_STEP_PIN);
-    WRITE(E2_STEP_PIN,INVERT_E_STEP_PIN);
+    OUT_WRITE(E2_STEP_PIN,INVERT_E_STEP_PIN);
     disable_e2();
   #endif
   #if defined(E3_STEP_PIN) && (E3_STEP_PIN > -1)
-    SET_OUTPUT(E3_STEP_PIN);
-    WRITE(E3_STEP_PIN,INVERT_E_STEP_PIN);
+    OUT_WRITE(E3_STEP_PIN,INVERT_E_STEP_PIN);
     disable_e3();
   #endif
 

Marlin/temperature.cpp

   #ifdef HEATER_0_USES_MAX6675
 
     #ifndef SDSUPPORT
-      SET_OUTPUT(SCK_PIN);
-      WRITE(SCK_PIN,0);
-    
-      SET_OUTPUT(MOSI_PIN);
-      WRITE(MOSI_PIN,1);
-    
-      SET_INPUT(MISO_PIN);
-      WRITE(MISO_PIN,1);
+      OUT_WRITE(SCK_PIN, LOW);
+      OUT_WRITE(MOSI_PIN, HIGH);
+      OUT_WRITE(MISO_PIN, HIGH);
     #else
       pinMode(SS_PIN, OUTPUT);
       digitalWrite(SS_PIN, HIGH);
     #endif
     
-    SET_OUTPUT(MAX6675_SS);
-    WRITE(MAX6675_SS,1);
+    OUT_WRITE(MAX6675_SS,HIGH);
 
   #endif //HEATER_0_USES_MAX6675
 

Marlin/ultralcd_implementation_hitachi_HD44780.h

 
 static void lcd_implementation_quick_feedback()
 {
-#ifdef LCD_USE_I2C_BUZZER
-	#if !defined(LCD_FEEDBACK_FREQUENCY_HZ) || !defined(LCD_FEEDBACK_FREQUENCY_DURATION_MS)
-	  lcd_buzz(1000/6,100);
-	#else
-	  lcd_buzz(LCD_FEEDBACK_FREQUENCY_DURATION_MS,LCD_FEEDBACK_FREQUENCY_HZ);
-	#endif
-#elif defined(BEEPER) && BEEPER > -1
+  #ifdef LCD_USE_I2C_BUZZER
+    #if defined(LCD_FEEDBACK_FREQUENCY_DURATION_MS) && defined(LCD_FEEDBACK_FREQUENCY_HZ)
+      lcd_buzz(LCD_FEEDBACK_FREQUENCY_DURATION_MS, LCD_FEEDBACK_FREQUENCY_HZ);
+    #else
+      lcd_buzz(1000/6, 100);
+    #endif
+  #elif defined(BEEPER) && BEEPER > -1
     SET_OUTPUT(BEEPER);
-	#if !defined(LCD_FEEDBACK_FREQUENCY_HZ) || !defined(LCD_FEEDBACK_FREQUENCY_DURATION_MS)
-    for(int8_t i=0;i<10;i++)
-    {
-      WRITE(BEEPER,HIGH);
-      delayMicroseconds(100);
-      WRITE(BEEPER,LOW);
-      delayMicroseconds(100);
-    }
+    #if !defined(LCD_FEEDBACK_FREQUENCY_HZ) || !defined(LCD_FEEDBACK_FREQUENCY_DURATION_MS)
+      const unsigned int delay = 100;
+      uint8_t i = 10;
     #else
-    for(int8_t i=0;i<(LCD_FEEDBACK_FREQUENCY_DURATION_MS / (1000 / LCD_FEEDBACK_FREQUENCY_HZ));i++)
-    {
+      const unsigned int delay = 1000000 / LCD_FEEDBACK_FREQUENCY_HZ / 2;
+      int8_t i = LCD_FEEDBACK_FREQUENCY_DURATION_MS * LCD_FEEDBACK_FREQUENCY_HZ / 1000;
+    #endif
+    while (i--) {
       WRITE(BEEPER,HIGH);
-      delayMicroseconds(1000000 / LCD_FEEDBACK_FREQUENCY_HZ / 2);
+      delayMicroseconds(delay);
       WRITE(BEEPER,LOW);
-      delayMicroseconds(1000000 / LCD_FEEDBACK_FREQUENCY_HZ / 2);
+      delayMicroseconds(delay);
     }
-    #endif
-#endif
+  #endif
 }
 
 #ifdef LCD_HAS_STATUS_INDICATORS

Marlin/ultralcd_st7920_u8glib_rrd.h

   {
     case U8G_DEV_MSG_INIT:
       {
-        SET_OUTPUT(ST7920_CS_PIN);
-        WRITE(ST7920_CS_PIN,0);
-        SET_OUTPUT(ST7920_DAT_PIN);
-        WRITE(ST7920_DAT_PIN,0);
-        SET_OUTPUT(ST7920_CLK_PIN);
-        WRITE(ST7920_CLK_PIN,1);
+        OUT_WRITE(ST7920_CS_PIN,LOW);
+        OUT_WRITE(ST7920_DAT_PIN,LOW);
+        OUT_WRITE(ST7920_CLK_PIN,HIGH);
 
         ST7920_CS();
         u8g_Delay(120);                 //initial delay for boot up