Support for BariCUDA Paste Extruder derived from MakerBot Frostruder. Using Ultimachine RAMBo board. M126/M127 and M128/M129.

Marlin/Marlin.h

 extern float min_pos[3];
 extern float max_pos[3];
 extern int fanSpeed;
+extern int ValvePressure;
+extern int EtoPPressure;
 
 #ifdef FWRETRACT
 extern bool autoretract_enabled;

Marlin/Marlin_main.cpp

 // M115	- Capabilities string
 // M117 - display message
 // M119 - Output Endstop status to serial port
+// M126 - Solenoid Air Valve Open (BariCUDA support by jmil)
+// M127 - Solenoid Air Valve Closed (BariCUDA vent to atmospheric pressure by jmil)
+// M128 - EtoP Open (BariCUDA EtoP = electricity to air pressure transducer by jmil)
+// M129 - EtoP Closed (BariCUDA EtoP = electricity to air pressure transducer by jmil)
 // M140 - Set bed target temp
 // M190 - Wait for bed current temp to reach target temp.
 // M200 - Set filament diameter
 #endif
 uint8_t active_extruder = 0;
 int fanSpeed=0;
+int ValvePressure=0;
+int EtoPPressure=0;
 
 #ifdef FWRETRACT
   bool autoretract_enabled=true;
         break;
     #endif //FAN_PIN
 
+	// PWM for HEATER_1_PIN
+    #if HEATER_1_PIN > -1
+      case 126: //M126 valve open
+        if (code_seen('S')){
+           ValvePressure=constrain(code_value(),0,255);
+        }
+        else {
+          ValvePressure=255;			
+        }
+        break;
+      case 127: //M127 valve closed
+        ValvePressure = 0;
+        break;
+    #endif //HEATER_1_PIN
+
+	// PWM for HEATER_2_PIN
+    #if HEATER_2_PIN > -1
+      case 128: //M128 valve open
+        if (code_seen('S')){
+           EtoPPressure=constrain(code_value(),0,255);
+        }
+        else {
+          EtoPPressure=255;			
+        }
+        break;
+      case 129: //M129 valve closed
+        EtoPPressure = 0;
+        break;
+    #endif //HEATER_2_PIN
+
+
     #if (PS_ON_PIN > -1)
       case 80: // M80 - ATX Power On
         SET_OUTPUT(PS_ON_PIN); //GND

Marlin/pins.h

 #define HEATER_1_PIN 7
 #define TEMP_1_PIN 1
 
-#define HEATER_2_PIN -1
+#define HEATER_2_PIN 6
 #define TEMP_2_PIN -1
 
 #define E0_STEP_PIN         34

Marlin/planner.cpp

   unsigned char z_active = 0;
   unsigned char e_active = 0;
   unsigned char tail_fan_speed = fanSpeed;
+  unsigned char valve_pressure = 0;
+  unsigned char e_to_p_pressure = 0;
+  unsigned char tail_valve_pressure = 0;
+  unsigned char tail_e_to_p_pressure = 0;
   block_t *block;
 
   if(block_buffer_tail != block_buffer_head)
   {
     uint8_t block_index = block_buffer_tail;
     tail_fan_speed = block_buffer[block_index].fan_speed;
+    tail_valve_pressure = block_buffer[block_index].valve_pressure;
+    tail_e_to_p_pressure = block_buffer[block_index].e_to_p_pressure;
     while(block_index != block_buffer_head)
     {
       block = &block_buffer[block_index];
 #ifdef AUTOTEMP
   getHighESpeed();
 #endif
+
+#if HEATER_1_PIN > -1
+    if (ValvePressure != 0){
+      analogWrite(HEATER_1_PIN,ValvePressure); // If buffer is empty use current fan speed
+    }
+#endif
+#if HEATER_2_PIN > -1
+    if (EtoPPressure != 0){
+      analogWrite(HEATER_2_PIN,EtoPPressure); // If buffer is empty use current fan speed
+    }
+#endif
 }
 
 
   }
 
   block->fan_speed = fanSpeed;
+  block->valve_pressure = ValvePressure;
+  block->e_to_p_pressure = EtoPPressure;
 
   // Compute direction bits for this block 
   block->direction_bits = 0;

Marlin/planner.h

   unsigned long final_rate;                          // The minimal rate at exit
   unsigned long acceleration_st;                     // acceleration steps/sec^2
   unsigned long fan_speed;
+  unsigned long valve_pressure;
+  unsigned long e_to_p_pressure;
   volatile char busy;
 } block_t;