diff --git a/Marlin/Marlin_main.cpp b/Marlin/Marlin_main.cpp
index 29893925c3..c3ccea40d9 100644
--- a/Marlin/Marlin_main.cpp
+++ b/Marlin/Marlin_main.cpp
@@ -119,6 +119,7 @@
 // M109 - Sxxx Wait for extruder current temp to reach target temp. Waits only when heating
 //        Rxxx Wait for extruder current temp to reach target temp. Waits when heating and cooling
 //        IF AUTOTEMP is enabled, S<mintemp> B<maxtemp> F<factor>. Exit autotemp by any M109 without F
+// M112 - Emergency stop
 // M114 - Output current position to serial port
 // M115 - Capabilities string
 // M117 - display message
@@ -673,6 +674,11 @@ void get_command()
           }
 
         }
+
+        //If command was e-stop process now
+        if(strcmp(cmdbuffer[bufindw], "M112") == 0)
+          kill();
+        
         bufindw = (bufindw + 1)%BUFSIZE;
         buflen += 1;
       }
@@ -1177,19 +1183,21 @@ void process_commands()
         //ClearToSend();
         return;
       }
-      //break;
+      break;
     case 2: // G2  - CW ARC
       if(Stopped == false) {
         get_arc_coordinates();
         prepare_arc_move(true);
         return;
       }
+      break;
     case 3: // G3  - CCW ARC
       if(Stopped == false) {
         get_arc_coordinates();
         prepare_arc_move(false);
         return;
       }
+      break;
     case 4: // G4 dwell
       LCD_MESSAGEPGM(MSG_DWELL);
       codenum = 0;
@@ -1799,7 +1807,7 @@ void process_commands()
         int pin_number = LED_PIN;
         if (code_seen('P') && pin_status >= 0 && pin_status <= 255)
           pin_number = code_value();
-        for(int8_t i = 0; i < (int8_t)sizeof(sensitive_pins); i++)
+        for(int8_t i = 0; i < (int8_t)(sizeof(sensitive_pins)/sizeof(int)); i++)
         {
           if (sensitive_pins[i] == pin_number)
           {
@@ -1830,6 +1838,9 @@ void process_commands()
 #endif
       setWatch();
       break;
+    case 112: //  M112 -Emergency Stop
+      kill();
+      break;
     case 140: // M140 set bed temp
       if (code_seen('S')) setTargetBed(code_value());
       break;
@@ -2153,8 +2164,9 @@ void process_commands()
       }
       break;
     case 85: // M85
-      code_seen('S');
-      max_inactive_time = code_value() * 1000;
+      if(code_seen('S')) {
+        max_inactive_time = code_value() * 1000;
+      }
       break;
     case 92: // M92
       for(int8_t i=0; i < NUM_AXIS; i++)
@@ -2275,6 +2287,7 @@ void process_commands()
           if(tmp_extruder >= EXTRUDERS) {
             SERIAL_ECHO_START;
             SERIAL_ECHO(MSG_M200_INVALID_EXTRUDER);
+            break;
           }
         }
         volumetric_multiplier[tmp_extruder] = 1 / area;
@@ -2466,7 +2479,7 @@ void process_commands()
 
         if(pin_state >= -1 && pin_state <= 1){
 
-          for(int8_t i = 0; i < (int8_t)sizeof(sensitive_pins); i++)
+          for(int8_t i = 0; i < (int8_t)(sizeof(sensitive_pins)/sizeof(int)); i++)
           {
             if (sensitive_pins[i] == pin_number)
             {
@@ -3424,6 +3437,9 @@ void handle_status_leds(void) {
 
 void manage_inactivity()
 {
+  if(buflen < (BUFSIZE-1))
+    get_command();
+
   if( (millis() - previous_millis_cmd) >  max_inactive_time )
     if(max_inactive_time)
       kill();
diff --git a/Marlin/temperature.cpp b/Marlin/temperature.cpp
index 737d075754..aac6ca66f5 100644
--- a/Marlin/temperature.cpp
+++ b/Marlin/temperature.cpp
@@ -179,7 +179,7 @@ void PID_autotune(float temp, int extruder, int ncycles)
   float Kp, Ki, Kd;
   float max = 0, min = 10000;
 
-  if ((extruder > EXTRUDERS)
+  if ((extruder >= EXTRUDERS)
   #if (TEMP_BED_PIN <= -1)
        ||(extruder < 0)
   #endif
@@ -609,6 +609,7 @@ static float analog2temp(int raw, uint8_t e) {
       SERIAL_ERROR((int)e);
       SERIAL_ERRORLNPGM(" - Invalid extruder number !");
       kill();
+      return 0.0;
   } 
   #ifdef HEATER_0_USES_MAX6675
     if (e == 0)
@@ -909,7 +910,7 @@ void disable_heater()
    #endif
   #endif
      
-  #if defined(TEMP_1_PIN) && TEMP_1_PIN > -1
+  #if defined(TEMP_1_PIN) && TEMP_1_PIN > -1 && EXTRUDERS > 1
     target_temperature[1]=0;
     soft_pwm[1]=0;
     #if defined(HEATER_1_PIN) && HEATER_1_PIN > -1 
@@ -917,7 +918,7 @@ void disable_heater()
     #endif
   #endif
       
-  #if defined(TEMP_2_PIN) && TEMP_2_PIN > -1
+  #if defined(TEMP_2_PIN) && TEMP_2_PIN > -1 && EXTRUDERS > 2
     target_temperature[2]=0;
     soft_pwm[2]=0;
     #if defined(HEATER_2_PIN) && HEATER_2_PIN > -1  
diff --git a/Marlin/ultralcd_implementation_hitachi_HD44780.h b/Marlin/ultralcd_implementation_hitachi_HD44780.h
index fd3374454d..c321125cae 100644
--- a/Marlin/ultralcd_implementation_hitachi_HD44780.h
+++ b/Marlin/ultralcd_implementation_hitachi_HD44780.h
@@ -305,7 +305,7 @@ static void lcd_implementation_init()
         B00000
     }; //thanks Sonny Mounicou
 
-#if defined(LCDI2C_TYPE_PCF8575)
+#if defined(LCD_I2C_TYPE_PCF8575)
     lcd.begin(LCD_WIDTH, LCD_HEIGHT);
   #ifdef LCD_I2C_PIN_BL
     lcd.setBacklightPin(LCD_I2C_PIN_BL,POSITIVE);
diff --git a/README.md b/README.md
index 94552684ea..17e920ec00 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,8 @@
 ==========================
 Marlin 3D Printer Firmware
 ==========================
+[![Coverity Scan Build Status](https://scan.coverity.com/projects/2224/badge.svg)](https://scan.coverity.com/projects/2224)
+
 Marlin has a GPL license because I believe in open development.
 Please do not use this code in products (3D printers, CNC etc) that are closed source or are crippled by a patent.
 
@@ -193,6 +195,7 @@ M Codes
 *  M107 - Fan off
 *  M109 - Sxxx Wait for extruder current temp to reach target temp. Waits only when heating
 *         Rxxx Wait for extruder current temp to reach target temp. Waits when heating and cooling
+*  M112 - Emergency stop
 *  M114 - Output current position to serial port
 *  M115 - Capabilities string
 *  M117 - display message