From 26b166d7cf1e363da2daefbc52fd097d88513807 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jo=C3=A3o=20Br=C3=A1zio?= <jbrazio@gmail.com>
Date: Wed, 27 Apr 2016 02:12:08 +0100
Subject: [PATCH 01/10] Made all stopwatch::debug() calls static

---
 Marlin/printcounter.cpp | 109 ++++++++++++++++++++++++++++++++++++++++
 Marlin/printcounter.h   |  93 ++++++++++++++++++++++++++++++++++
 Marlin/stopwatch.cpp    |   8 +--
 3 files changed, 206 insertions(+), 4 deletions(-)
 create mode 100644 Marlin/printcounter.cpp
 create mode 100644 Marlin/printcounter.h

diff --git a/Marlin/printcounter.cpp b/Marlin/printcounter.cpp
new file mode 100644
index 000000000..a8da87d33
--- /dev/null
+++ b/Marlin/printcounter.cpp
@@ -0,0 +1,109 @@
+/*
+ * Marlin 3D Printer Firmware
+ * Copyright (C) 2016 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (C) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "Marlin.h"
+#include "printcounter.h"
+#include <avr/eeprom.h>
+
+PrintCounter::PrintCounter(): super() {}
+
+void PrintCounter::tick() {
+  if (!this->isRunning()) return;
+
+  static uint32_t update_before = millis(),
+                  eeprom_before = millis();
+
+  uint32_t now = millis();
+
+  // Trying to get the amount of calculations down to the bare min
+  const static uint16_t i = this->updateInterval * 1000;
+
+  if (now - update_before >= i) {
+    //this->addToTimeCounter((uint16_t) (now - update_before) / 1000);
+    update_before = now;
+    PrintCounter::debug(PSTR("tick1"));
+  }
+
+  // Trying to get the amount of calculations down to the bare min
+  const static uint16_t j = this->saveInterval * 1000;
+
+  if (now - eeprom_before >= j) {
+    eeprom_before = now;
+    this->save();
+  }
+}
+
+void PrintCounter::load() {
+  uint16_t pos = this->addr;
+
+  this->data.successPrints= eeprom_read_word ((uint16_t*) pos);
+  this->data.failedPrints = eeprom_read_word ((uint16_t*) pos);
+  this->data.printTime    = eeprom_read_dword((uint32_t*) pos);
+  this->data.longestPrint = eeprom_read_dword((uint32_t*) pos);
+
+  SERIAL_ECHOPGM("successPrints: ");
+  SERIAL_ECHOLN(this->data.successPrints);
+
+  SERIAL_ECHOPGM("failedPrints: ");
+  SERIAL_ECHOLN(this->data.failedPrints);
+
+  SERIAL_ECHOPGM("printTime: ");
+  SERIAL_ECHOLN(this->data.printTime);
+
+  SERIAL_ECHOPGM("longestPrint: ");
+  SERIAL_ECHOLN(this->data.longestPrint);
+}
+
+void PrintCounter::save() {
+  #if ENABLED(DEBUG_PRINTCOUNTER)
+    PrintCounter::debug(PSTR("save"));
+  #endif
+
+  uint16_t pos = this->addr;
+
+  eeprom_write_word ((uint16_t*) pos, this->data.successPrints);
+  eeprom_write_word ((uint16_t*) pos, this->data.failedPrints);
+  eeprom_write_dword((uint32_t*) pos, this->data.printTime);
+  eeprom_write_dword((uint32_t*) pos, this->data.longestPrint);
+}
+
+void PrintCounter::start() {
+  super::start();
+  this->load();
+}
+
+void PrintCounter::stop() {
+  super::stop();
+  this->save();
+}
+
+#if ENABLED(DEBUG_PRINTCOUNTER)
+
+  void PrintCounter::debug(const char func[]) {
+    if (DEBUGGING(INFO)) {
+      SERIAL_ECHOPGM("PrintCounter::");
+      serialprintPGM(func);
+      SERIAL_ECHOLNPGM("()");
+    }
+  }
+
+#endif
diff --git a/Marlin/printcounter.h b/Marlin/printcounter.h
new file mode 100644
index 000000000..99d5b207b
--- /dev/null
+++ b/Marlin/printcounter.h
@@ -0,0 +1,93 @@
+/*
+ * Marlin 3D Printer Firmware
+ * Copyright (C) 2016 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (C) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifndef PRINTCOUNTER_H
+#define PRINTCOUNTER_H
+
+#include "macros.h"
+#include "stopwatch.h"
+
+// Print debug messages with M111 S2
+#define DEBUG_PRINTCOUNTER
+
+struct printStatistics {  // 12 bytes
+  uint16_t successPrints; // Total number of prints
+  uint16_t failedPrints;  // Total number of aborted prints - not in use
+  uint32_t printTime;     // Total time printing
+  uint32_t longestPrint;  // Longest print job - not in use
+};
+
+class PrintCounter: public Stopwatch {
+  private:
+    typedef Stopwatch super;
+
+    printStatistics data;
+
+    /**
+     * @brief EEPROM address
+     * @details Defines the start offset address where the data is stored.
+     */
+    const uint16_t addr = 60;
+
+    /**
+     * @brief Interval in seconds between counter updates
+     * @details This const value defines what will be the time between each
+     * accumulator update. This is different from the EEPROM save interval
+     * which is user defined at the Configuration.h file.
+     */
+    const uint16_t updateInterval = 2;
+
+    /**
+     * @brief Interval in seconds between EEPROM saves
+     * @details This const value defines what will be the time between each
+     * EEPROM save cycle, the development team recommends to set this value
+     * no lower than 3600 secs (1 hour).
+     */
+    const uint16_t saveInterval = PRINTCOUNTER_SAVE_INTERVAL;
+
+  public:
+    /**
+     * @brief Class constructor
+     */
+    PrintCounter();
+
+    void tick();
+    void save();
+    void load();
+    void addToTimeCounter(uint16_t const &minutes);
+    void addToPrintCounter(uint8_t const &prints);
+
+    void start();
+    void stop();
+
+    #if ENABLED(DEBUG_PRINTCOUNTER)
+
+      /**
+       * @brief Prints a debug message
+       * @details Prints a simple debug message "PrintCounter::function"
+       */
+      static void debug(const char func[]);
+
+    #endif
+};
+
+#endif // PRINTCOUNTER_H
diff --git a/Marlin/stopwatch.cpp b/Marlin/stopwatch.cpp
index f871af1c7..4a1344db1 100644
--- a/Marlin/stopwatch.cpp
+++ b/Marlin/stopwatch.cpp
@@ -29,7 +29,7 @@ Stopwatch::Stopwatch() {
 
 void Stopwatch::stop() {
   #if ENABLED(DEBUG_STOPWATCH)
-    debug(PSTR("stop"));
+    Stopwatch::debug(PSTR("stop"));
   #endif
 
   if (!this->isRunning()) return;
@@ -40,7 +40,7 @@ void Stopwatch::stop() {
 
 void Stopwatch::pause() {
   #if ENABLED(DEBUG_STOPWATCH)
-    debug(PSTR("pause"));
+    Stopwatch::debug(PSTR("pause"));
   #endif
 
   if (!this->isRunning()) return;
@@ -51,7 +51,7 @@ void Stopwatch::pause() {
 
 void Stopwatch::start() {
   #if ENABLED(DEBUG_STOPWATCH)
-    debug(PSTR("start"));
+    Stopwatch::debug(PSTR("start"));
   #endif
 
   if (this->isRunning()) return;
@@ -65,7 +65,7 @@ void Stopwatch::start() {
 
 void Stopwatch::reset() {
   #if ENABLED(DEBUG_STOPWATCH)
-    debug(PSTR("reset"));
+    Stopwatch::debug(PSTR("reset"));
   #endif
 
   this->state = STPWTCH_STOPPED;

From 4f541c5bb5318b4da52a3493c484166be60caa7f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jo=C3=A3o=20Br=C3=A1zio?= <jbrazio@gmail.com>
Date: Wed, 27 Apr 2016 02:12:46 +0100
Subject: [PATCH 02/10] Added a new object: PrintCounter

---
 Marlin/printcounter.cpp | 171 +++++++++++++++++++++++++++++++---------
 Marlin/printcounter.h   |  78 +++++++++++++++---
 2 files changed, 199 insertions(+), 50 deletions(-)

diff --git a/Marlin/printcounter.cpp b/Marlin/printcounter.cpp
index a8da87d33..f2999fb04 100644
--- a/Marlin/printcounter.cpp
+++ b/Marlin/printcounter.cpp
@@ -24,7 +24,112 @@
 #include "printcounter.h"
 #include <avr/eeprom.h>
 
-PrintCounter::PrintCounter(): super() {}
+PrintCounter::PrintCounter(): super() {
+  this->loadStats();
+}
+
+bool PrintCounter::isLoaded() {
+  return this->loaded;
+}
+
+void PrintCounter::initStats() {
+  #if ENABLED(DEBUG_PRINTCOUNTER)
+    PrintCounter::debug(PSTR("initStats"));
+  #endif
+
+  this->loaded = true;
+  this->data = {
+    0, 0, 0, 0
+  };
+
+  this->saveStats();
+  eeprom_write_byte((uint8_t*) this->addr, 0x16);
+}
+
+void PrintCounter::loadStats() {
+  #if ENABLED(DEBUG_PRINTCOUNTER)
+    PrintCounter::debug(PSTR("loadStats"));
+  #endif
+
+  uint16_t addr = this->addr;
+
+  // Checks if the EEPROM block is initialized
+  if (eeprom_read_byte((uint8_t*) addr) != 0x16) this->initStats();
+
+  else {
+    // Skip the magic header byte
+    addr += sizeof(uint8_t);
+
+    // @todo This section will need rewrite once the ConfigurationStore
+    // and/or PersistentStorage object comes along.
+    this->data.totalPrints = eeprom_read_word((uint16_t*) addr);
+    addr += sizeof(uint16_t);
+
+    this->data.finishedPrints = eeprom_read_word((uint16_t*) addr);
+    addr += sizeof(uint16_t);
+
+    this->data.printTime = eeprom_read_dword((uint32_t*) addr);
+    addr += sizeof(uint32_t);
+
+    this->data.longestPrint = eeprom_read_dword((uint32_t*) addr);
+  }
+
+  this->loaded = true;
+}
+
+void PrintCounter::saveStats() {
+  #if ENABLED(DEBUG_PRINTCOUNTER)
+    PrintCounter::debug(PSTR("saveStats"));
+  #endif
+
+  // Refuses to save data is object is not loaded
+  if (!this->isLoaded()) return;
+
+  // Skip the magic header byte
+  uint16_t addr = this->addr + sizeof(uint8_t);
+
+  // @todo This section will need rewrite once the ConfigurationStore
+  // and/or PersistentStorage object comes along.
+  eeprom_write_word ((uint16_t*) addr, this->data.totalPrints);
+  addr += sizeof(uint16_t);
+
+  eeprom_write_word ((uint16_t*) addr, this->data.finishedPrints);
+  addr += sizeof(uint16_t);
+
+  eeprom_write_dword((uint32_t*) addr, this->data.printTime);
+  addr += sizeof(uint32_t);
+
+  eeprom_write_dword((uint32_t*) addr, this->data.longestPrint);
+}
+
+void PrintCounter::showStats() {
+  SERIAL_ECHOPGM("Print statistics: Total: ");
+  SERIAL_ECHO(this->data.totalPrints);
+
+  SERIAL_ECHOPGM(", Finished: ");
+  SERIAL_ECHO(this->data.finishedPrints);
+
+  SERIAL_ECHOPGM(", Failed: ");
+  SERIAL_ECHO(this->data.totalPrints - this->data.finishedPrints);
+
+  uint32_t t = this->data.printTime /60;
+  SERIAL_ECHOPGM(", Total print time: ");
+  SERIAL_ECHO(t / 60);
+
+  SERIAL_ECHOPGM("h ");
+  SERIAL_ECHO(t % 60);
+
+  SERIAL_ECHOPGM("min");
+
+  #if ENABLED(DEBUG_PRINTCOUNTER)
+    SERIAL_ECHOPGM(" (");
+    SERIAL_ECHO(this->data.printTime);
+    SERIAL_ECHOPGM(")");
+  #endif
+
+  // @todo longestPrint missing implementation
+  SERIAL_EOL;
+}
 
 void PrintCounter::tick() {
   if (!this->isRunning()) return;
@@ -38,9 +143,14 @@ void PrintCounter::tick() {
   const static uint16_t i = this->updateInterval * 1000;
 
   if (now - update_before >= i) {
-    //this->addToTimeCounter((uint16_t) (now - update_before) / 1000);
+    #if ENABLED(DEBUG_PRINTCOUNTER)
+      PrintCounter::debug(PSTR("tick"));
+    #endif
+
+    uint16_t t = this->duration();;
+    this->data.printTime += t - this->lastUpdate;
+    this->lastUpdate = t;
     update_before = now;
-    PrintCounter::debug(PSTR("tick1"));
   }
 
   // Trying to get the amount of calculations down to the bare min
@@ -48,52 +158,37 @@ void PrintCounter::tick() {
 
   if (now - eeprom_before >= j) {
     eeprom_before = now;
-    this->save();
+    this->saveStats();
   }
 }
 
-void PrintCounter::load() {
-  uint16_t pos = this->addr;
-
-  this->data.successPrints= eeprom_read_word ((uint16_t*) pos);
-  this->data.failedPrints = eeprom_read_word ((uint16_t*) pos);
-  this->data.printTime    = eeprom_read_dword((uint32_t*) pos);
-  this->data.longestPrint = eeprom_read_dword((uint32_t*) pos);
-
-  SERIAL_ECHOPGM("successPrints: ");
-  SERIAL_ECHOLN(this->data.successPrints);
-
-  SERIAL_ECHOPGM("failedPrints: ");
-  SERIAL_ECHOLN(this->data.failedPrints);
-
-  SERIAL_ECHOPGM("printTime: ");
-  SERIAL_ECHOLN(this->data.printTime);
-
-  SERIAL_ECHOPGM("longestPrint: ");
-  SERIAL_ECHOLN(this->data.longestPrint);
-}
-
-void PrintCounter::save() {
+void PrintCounter::start() {
   #if ENABLED(DEBUG_PRINTCOUNTER)
-    PrintCounter::debug(PSTR("save"));
+    PrintCounter::debug(PSTR("start"));
   #endif
 
-  uint16_t pos = this->addr;
-
-  eeprom_write_word ((uint16_t*) pos, this->data.successPrints);
-  eeprom_write_word ((uint16_t*) pos, this->data.failedPrints);
-  eeprom_write_dword((uint32_t*) pos, this->data.printTime);
-  eeprom_write_dword((uint32_t*) pos, this->data.longestPrint);
-}
-
-void PrintCounter::start() {
+  if (!this->isPaused()) this->data.totalPrints++;
   super::start();
-  this->load();
 }
 
 void PrintCounter::stop() {
+  #if ENABLED(DEBUG_PRINTCOUNTER)
+    PrintCounter::debug(PSTR("stop"));
+  #endif
+
   super::stop();
-  this->save();
+  this->data.finishedPrints++;
+  this->data.printTime += this->duration() - this->lastUpdate;
+  this->saveStats();
+}
+
+void PrintCounter::reset() {
+  #if ENABLED(DEBUG_PRINTCOUNTER)
+    PrintCounter::debug(PSTR("stop"));
+  #endif
+
+  this->lastUpdate = 0;
+  super::reset();
 }
 
 #if ENABLED(DEBUG_PRINTCOUNTER)
diff --git a/Marlin/printcounter.h b/Marlin/printcounter.h
index 99d5b207b..e2410104b 100644
--- a/Marlin/printcounter.h
+++ b/Marlin/printcounter.h
@@ -29,11 +29,12 @@
 // Print debug messages with M111 S2
 #define DEBUG_PRINTCOUNTER
 
-struct printStatistics {  // 12 bytes
-  uint16_t successPrints; // Total number of prints
-  uint16_t failedPrints;  // Total number of aborted prints - not in use
-  uint32_t printTime;     // Total time printing
-  uint32_t longestPrint;  // Longest print job - not in use
+struct printStatistics {    // 13 bytes
+  //uint8_t  magic;         // Magic header, it will always be 0x16
+  uint16_t totalPrints;     // Number of prints
+  uint16_t finishedPrints;  // Number of complete prints
+  uint32_t printTime;       // Total printing time
+  uint32_t longestPrint;    // Longest print job - not in use
 };
 
 class PrintCounter: public Stopwatch {
@@ -42,11 +43,19 @@ class PrintCounter: public Stopwatch {
 
     printStatistics data;
 
+    /**
+     * @brief Timestamp of the last update
+     * @details Stores the timestamp of the last data.pritnTime update, when the
+     * print job finishes, this will be used to calculate the exact time elapsed,
+     * this is required due to the updateInterval cycle.
+     */
+    uint16_t lastUpdate;
+
     /**
      * @brief EEPROM address
      * @details Defines the start offset address where the data is stored.
      */
-    const uint16_t addr = 60;
+    const uint16_t addr = 50;
 
     /**
      * @brief Interval in seconds between counter updates
@@ -54,7 +63,7 @@ class PrintCounter: public Stopwatch {
      * accumulator update. This is different from the EEPROM save interval
      * which is user defined at the Configuration.h file.
      */
-    const uint16_t updateInterval = 2;
+    const uint16_t updateInterval = 10;
 
     /**
      * @brief Interval in seconds between EEPROM saves
@@ -64,20 +73,65 @@ class PrintCounter: public Stopwatch {
      */
     const uint16_t saveInterval = PRINTCOUNTER_SAVE_INTERVAL;
 
+    /**
+     * @brief Stats were loaded from EERPROM
+     * @details If set to true it indicates if the statistical data was already
+     * loaded from the EEPROM.
+     */
+    bool loaded = false;
+
   public:
     /**
      * @brief Class constructor
      */
     PrintCounter();
 
-    void tick();
-    void save();
-    void load();
-    void addToTimeCounter(uint16_t const &minutes);
-    void addToPrintCounter(uint8_t const &prints);
+    /**
+     * @brief Checks if Print Statistics has been loaded
+     * @details Returns true if the statistical data has been loaded.
+     * @return bool
+     */
+    bool isLoaded();
 
+    /**
+     * @brief Resets the Print Statistics
+     * @details Resets the statistics to zero and saves them to EEPROM creating
+     * also the magic header.
+     */
+    void initStats();
+
+    /**
+     * @brief Loads the Print Statistics
+     * @details Loads the statistics from EEPROM
+     */
+    void loadStats();
+
+    /**
+     * @brief Saves the Print Statistics
+     * @details Saves the statistics to EEPROM
+     */
+    void saveStats();
+
+    /**
+     * @brief Serial output the Print Statistics
+     * @details This function may change in the future, for now it directly
+     * prints the statistical data to serial.
+     */
+    void showStats();
+
+    /**
+     * @brief Loop function
+     * @details This function should be called at loop, it will take care of
+     * periodically save the statistical data to EEPROM and do time keeping.
+     */
+    void tick();
+
+    /**
+     * The following functions are being overridden
+     */
     void start();
     void stop();
+    void reset();
 
     #if ENABLED(DEBUG_PRINTCOUNTER)
 

From d6cfcc9c8bed6c81222e6f64ea09d1a670e7de04 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jo=C3=A3o=20Br=C3=A1zio?= <jbrazio@gmail.com>
Date: Wed, 27 Apr 2016 02:13:27 +0100
Subject: [PATCH 03/10] Added new G-Code: M78

---
 Marlin/Marlin.h        | 12 ++++++++++--
 Marlin/Marlin_main.cpp | 24 +++++++++++++++++++++++-
 2 files changed, 33 insertions(+), 3 deletions(-)

diff --git a/Marlin/Marlin.h b/Marlin/Marlin.h
index cc08d724b..9cd13c90e 100644
--- a/Marlin/Marlin.h
+++ b/Marlin/Marlin.h
@@ -65,7 +65,11 @@ typedef unsigned long millis_t;
 
 #include "WString.h"
 
-#include "stopwatch.h"
+#if ENABLED(PRINTCOUNTER)
+  #include "printcounter.h"
+#else
+  #include "stopwatch.h"
+#endif
 
 #ifdef USBCON
   #if ENABLED(BLUETOOTH)
@@ -364,7 +368,11 @@ extern bool axis_homed[3]; // axis[n].is_homed
 #endif
 
 // Print job timer
-extern Stopwatch print_job_timer;
+#if ENABLED(PRINTCOUNTER)
+  extern PrintCounter print_job_timer;
+#else
+  extern Stopwatch print_job_timer;
+#endif
 
 // Handling multiple extruders pins
 extern uint8_t active_extruder;
diff --git a/Marlin/Marlin_main.cpp b/Marlin/Marlin_main.cpp
index 17d51f06f..2ddb33096 100644
--- a/Marlin/Marlin_main.cpp
+++ b/Marlin/Marlin_main.cpp
@@ -327,7 +327,11 @@ static millis_t max_inactive_time = 0;
 static millis_t stepper_inactive_time = (DEFAULT_STEPPER_DEACTIVE_TIME) * 1000UL;
 
 // Print Job Timer
-Stopwatch print_job_timer = Stopwatch();
+#if ENABLED(PRINTCOUNTER)
+  PrintCounter print_job_timer = PrintCounter();
+#else
+  Stopwatch print_job_timer = Stopwatch();
+#endif
 
 static uint8_t target_extruder;
 
@@ -4252,6 +4256,15 @@ inline void gcode_M77() {
   print_job_timer.stop();
 }
 
+#if ENABLED(PRINTCOUNTER)
+  /*+
+   * M78: Show print statistics
+   */
+  inline void gcode_M78() {
+    print_job_timer.showStats();
+  }
+#endif
+
 /**
  * M104: Set hot end temperature
  */
@@ -6636,6 +6649,12 @@ void process_next_command() {
         gcode_M77();
         break;
 
+      #if ENABLED(PRINTCOUNTER)
+        case 78: // Show print statistics
+          gcode_M78();
+          break;
+      #endif
+
       #if ENABLED(M100_FREE_MEMORY_WATCHER)
         case 100:
           gcode_M100();
@@ -7750,6 +7769,9 @@ void idle(
   );
   host_keepalive();
   lcd_update();
+  #if ENABLED(PRINTCOUNTER)
+      print_job_timer.tick();
+  #endif
 }
 
 /**

From e2da7e5000c64e2179bb2748dfa96d45f9f0a4c5 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jo=C3=A3o=20Br=C3=A1zio?= <jbrazio@gmail.com>
Date: Wed, 27 Apr 2016 02:27:23 +0100
Subject: [PATCH 04/10] Updated the default configuration and fixed a
 printcounter.h typo

---
 Marlin/Configuration.h | 13 +++++++++++++
 Marlin/printcounter.h  |  2 +-
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/Marlin/Configuration.h b/Marlin/Configuration.h
index edbeb44ab..c9a6245e9 100644
--- a/Marlin/Configuration.h
+++ b/Marlin/Configuration.h
@@ -757,6 +757,19 @@ const bool Z_MIN_PROBE_ENDSTOP_INVERTING = false; // set to true to invert the l
 #define ABS_PREHEAT_HPB_TEMP 110
 #define ABS_PREHEAT_FAN_SPEED 0   // Insert Value between 0 and 255
 
+
+//
+// Print Counter
+//
+// When enabled Marlin will keep track of some print statistical data such as:
+//  - Total print jobs
+//  - Total successfull print jobs
+//  - Total failed print jobs
+//  - Total time printing
+//
+// This information can be viewed by the M78 command.
+//#define PRINTCOUNTER
+
 //=============================================================================
 //============================= LCD and SD support ============================
 //=============================================================================
diff --git a/Marlin/printcounter.h b/Marlin/printcounter.h
index e2410104b..6a4e4c784 100644
--- a/Marlin/printcounter.h
+++ b/Marlin/printcounter.h
@@ -71,7 +71,7 @@ class PrintCounter: public Stopwatch {
      * EEPROM save cycle, the development team recommends to set this value
      * no lower than 3600 secs (1 hour).
      */
-    const uint16_t saveInterval = PRINTCOUNTER_SAVE_INTERVAL;
+    const uint16_t saveInterval = 3600;
 
     /**
      * @brief Stats were loaded from EERPROM

From 484de24e2214c09b97f8e269c64b3c89c4302907 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jo=C3=A3o=20Br=C3=A1zio?= <jbrazio@gmail.com>
Date: Wed, 27 Apr 2016 02:32:23 +0100
Subject: [PATCH 05/10] Updated travis to test for PRINTCOUNTER

---
 .travis.yml | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/.travis.yml b/.travis.yml
index a2e58f228..fecb82a8d 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -139,7 +139,7 @@ script:
   ### I2C PANELS ###
   #
   # LCD_I2C_SAINSMART_YWROBOT
-  # Failing at the moment needs different library 
+  # Failing at the moment needs different library
   #- restore_configs
   #- opt_enable LCD_I2C_SAINSMART_YWROBOT
   #- build_marlin
@@ -199,6 +199,12 @@ script:
   - opt_set_adv Z2_MAX_PIN 2
   - build_marlin
   #
+  # Test PRINTCOUNTER
+  #
+  - restore_configs
+  - opt_enable PRINTCOUNTER
+  - build_marlin
+  #
   #
   ######## Example Configurations ##############
   #

From 9589e51810c55403ab4a3f164bb23e31d710c627 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jo=C3=A3o=20Br=C3=A1zio?= <jbrazio@gmail.com>
Date: Wed, 27 Apr 2016 02:55:22 +0100
Subject: [PATCH 06/10] Disable DEBUG_PRINTCOUNTER

---
 Marlin/printcounter.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Marlin/printcounter.h b/Marlin/printcounter.h
index 6a4e4c784..9dbae6de2 100644
--- a/Marlin/printcounter.h
+++ b/Marlin/printcounter.h
@@ -27,7 +27,7 @@
 #include "stopwatch.h"
 
 // Print debug messages with M111 S2
-#define DEBUG_PRINTCOUNTER
+//#define DEBUG_PRINTCOUNTER
 
 struct printStatistics {    // 13 bytes
   //uint8_t  magic;         // Magic header, it will always be 0x16

From 8fb23e899fc6bb74ecd88f1403b8e26846416c1e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jo=C3=A3o=20Br=C3=A1zio?= <jbrazio@gmail.com>
Date: Thu, 28 Apr 2016 02:30:07 +0100
Subject: [PATCH 07/10] PrintCounter EEPROM read/write optimizations

---
 Marlin/printcounter.cpp | 63 +++++++++++++----------------------------
 Marlin/printcounter.h   | 26 +++++++++++------
 2 files changed, 36 insertions(+), 53 deletions(-)

diff --git a/Marlin/printcounter.cpp b/Marlin/printcounter.cpp
index f2999fb04..c29cc8fb2 100644
--- a/Marlin/printcounter.cpp
+++ b/Marlin/printcounter.cpp
@@ -28,6 +28,16 @@ PrintCounter::PrintCounter(): super() {
   this->loadStats();
 }
 
+uint16_t PrintCounter::deltaDuration() {
+  #if ENABLED(DEBUG_PRINTCOUNTER)
+    PrintCounter::debug(PSTR("deltaDuration"));
+  #endif
+
+  uint16_t tmp = this->lastDuration;
+  this->lastDuration = this->duration();
+  return this->lastDuration - tmp;
+}
+
 bool PrintCounter::isLoaded() {
   return this->loaded;
 }
@@ -38,9 +48,7 @@ void PrintCounter::initStats() {
   #endif
 
   this->loaded = true;
-  this->data = {
-    0, 0, 0, 0
-  };
+  this->data = { 0, 0, 0, 0 };
 
   this->saveStats();
   eeprom_write_byte((uint8_t*) this->addr, 0x16);
@@ -51,28 +59,9 @@ void PrintCounter::loadStats() {
     PrintCounter::debug(PSTR("loadStats"));
   #endif
 
-  uint16_t addr = this->addr;
-
   // Checks if the EEPROM block is initialized
-  if (eeprom_read_byte((uint8_t*) addr) != 0x16) this->initStats();
-
-  else {
-    // Skip the magic header byte
-    addr += sizeof(uint8_t);
-
-    // @todo This section will need rewrite once the ConfigurationStore
-    // and/or PersistentStorage object comes along.
-    this->data.totalPrints = eeprom_read_word((uint16_t*) addr);
-    addr += sizeof(uint16_t);
-
-    this->data.finishedPrints = eeprom_read_word((uint16_t*) addr);
-    addr += sizeof(uint16_t);
-
-    this->data.printTime = eeprom_read_dword((uint32_t*) addr);
-    addr += sizeof(uint32_t);
-
-    this->data.longestPrint = eeprom_read_dword((uint32_t*) addr);
-  }
+  if (eeprom_read_byte((uint8_t*) this->addr) != 0x16) this->initStats();
+  else eeprom_read_block(&this->data, (void *)(this->addr + sizeof(uint8_t)), sizeof(printStatistics));
 
   this->loaded = true;
 }
@@ -85,21 +74,7 @@ void PrintCounter::saveStats() {
   // Refuses to save data is object is not loaded
   if (!this->isLoaded()) return;
 
-  // Skip the magic header byte
-  uint16_t addr = this->addr + sizeof(uint8_t);
-
-  // @todo This section will need rewrite once the ConfigurationStore
-  // and/or PersistentStorage object comes along.
-  eeprom_write_word ((uint16_t*) addr, this->data.totalPrints);
-  addr += sizeof(uint16_t);
-
-  eeprom_write_word ((uint16_t*) addr, this->data.finishedPrints);
-  addr += sizeof(uint16_t);
-
-  eeprom_write_dword((uint32_t*) addr, this->data.printTime);
-  addr += sizeof(uint32_t);
-
-  eeprom_write_dword((uint32_t*) addr, this->data.longestPrint);
+  eeprom_write_block(&this->data, (void *)(this->addr + sizeof(uint8_t)), sizeof(printStatistics));
 }
 
 void PrintCounter::showStats() {
@@ -110,7 +85,8 @@ void PrintCounter::showStats() {
   SERIAL_ECHO(this->data.finishedPrints);
 
   SERIAL_ECHOPGM(", Failed: ");
-  SERIAL_ECHO(this->data.totalPrints - this->data.finishedPrints);
+  SERIAL_ECHO(this->data.totalPrints - this->data.finishedPrints
+    - (this->isRunning() || this->isPaused()) ? 1 : 0); // Removes 1 from failures with an active counter
 
   uint32_t t = this->data.printTime /60;
   SERIAL_ECHOPGM(", Total print time: ");
@@ -148,8 +124,7 @@ void PrintCounter::tick() {
     #endif
 
     uint16_t t = this->duration();;
-    this->data.printTime += t - this->lastUpdate;
-    this->lastUpdate = t;
+    this->data.printTime += this->deltaDuration();
     update_before = now;
   }
 
@@ -178,7 +153,7 @@ void PrintCounter::stop() {
 
   super::stop();
   this->data.finishedPrints++;
-  this->data.printTime += this->duration() - this->lastUpdate;
+  this->data.printTime += this->deltaDuration();
   this->saveStats();
 }
 
@@ -187,7 +162,7 @@ void PrintCounter::reset() {
     PrintCounter::debug(PSTR("stop"));
   #endif
 
-  this->lastUpdate = 0;
+  this->lastDuration = 0;
   super::reset();
 }
 
diff --git a/Marlin/printcounter.h b/Marlin/printcounter.h
index 9dbae6de2..05f704a5b 100644
--- a/Marlin/printcounter.h
+++ b/Marlin/printcounter.h
@@ -30,7 +30,7 @@
 //#define DEBUG_PRINTCOUNTER
 
 struct printStatistics {    // 13 bytes
-  //uint8_t  magic;         // Magic header, it will always be 0x16
+  //const uint8_t magic;    // Magic header, it will always be 0x16
   uint16_t totalPrints;     // Number of prints
   uint16_t finishedPrints;  // Number of complete prints
   uint32_t printTime;       // Total printing time
@@ -43,14 +43,6 @@ class PrintCounter: public Stopwatch {
 
     printStatistics data;
 
-    /**
-     * @brief Timestamp of the last update
-     * @details Stores the timestamp of the last data.pritnTime update, when the
-     * print job finishes, this will be used to calculate the exact time elapsed,
-     * this is required due to the updateInterval cycle.
-     */
-    uint16_t lastUpdate;
-
     /**
      * @brief EEPROM address
      * @details Defines the start offset address where the data is stored.
@@ -73,6 +65,13 @@ class PrintCounter: public Stopwatch {
      */
     const uint16_t saveInterval = 3600;
 
+    /**
+     * @brief Timestamp of the last call to deltaDuration()
+     * @details Stores the timestamp of the last deltaDuration(), this is
+     * required due to the updateInterval cycle.
+     */
+    uint16_t lastDuration;
+
     /**
      * @brief Stats were loaded from EERPROM
      * @details If set to true it indicates if the statistical data was already
@@ -80,6 +79,15 @@ class PrintCounter: public Stopwatch {
      */
     bool loaded = false;
 
+  protected:
+    /**
+     * @brief dT since the last call
+     * @details Returns the elapsed time in seconds since the last call, this is
+     * used internally for print statistics accounting is not intended to be a
+     * user callable function.
+     */
+    uint16_t deltaDuration();
+
   public:
     /**
      * @brief Class constructor

From 27088e356f68d6ef684c001d3b0293ce6105bc21 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jo=C3=A3o=20Br=C3=A1zio?= <jbrazio@gmail.com>
Date: Thu, 28 Apr 2016 02:36:38 +0100
Subject: [PATCH 08/10] Updated example configuration files

---
 .../example_configurations/Felix/Configuration.h  | 13 +++++++++++++
 .../Hephestos/Configuration.h                     | 13 +++++++++++++
 .../Hephestos_2/Configuration.h                   | 13 +++++++++++++
 .../example_configurations/K8200/Configuration.h  | 13 +++++++++++++
 .../RepRapWorld/Megatronics/Configuration.h       | 13 +++++++++++++
 .../RigidBot/Configuration.h                      | 15 ++++++++++++++-
 .../example_configurations/SCARA/Configuration.h  | 13 +++++++++++++
 .../example_configurations/TAZ4/Configuration.h   | 13 +++++++++++++
 .../example_configurations/WITBOX/Configuration.h | 13 +++++++++++++
 .../adafruit/ST7565/Configuration.h               | 13 +++++++++++++
 .../delta/biv2.5/Configuration.h                  | 13 +++++++++++++
 .../delta/generic/Configuration.h                 | 13 +++++++++++++
 .../delta/kossel_mini/Configuration.h             | 13 +++++++++++++
 .../delta/kossel_pro/Configuration.h              | 13 +++++++++++++
 .../delta/kossel_xl/Configuration.h               | 13 +++++++++++++
 .../makibox/Configuration.h                       | 13 +++++++++++++
 .../tvrrug/Round2/Configuration.h                 | 13 +++++++++++++
 17 files changed, 222 insertions(+), 1 deletion(-)

diff --git a/Marlin/example_configurations/Felix/Configuration.h b/Marlin/example_configurations/Felix/Configuration.h
index 1cdefc2bc..719018da9 100644
--- a/Marlin/example_configurations/Felix/Configuration.h
+++ b/Marlin/example_configurations/Felix/Configuration.h
@@ -739,6 +739,19 @@ const bool Z_MIN_PROBE_ENDSTOP_INVERTING = false; // set to true to invert the l
 #define ABS_PREHEAT_HPB_TEMP 100
 #define ABS_PREHEAT_FAN_SPEED 255   // Insert Value between 0 and 255
 
+
+//
+// Print Counter
+//
+// When enabled Marlin will keep track of some print statistical data such as:
+//  - Total print jobs
+//  - Total successfull print jobs
+//  - Total failed print jobs
+//  - Total time printing
+//
+// This information can be viewed by the M78 command.
+//#define PRINTCOUNTER
+
 //=============================================================================
 //============================= LCD and SD support ============================
 //=============================================================================
diff --git a/Marlin/example_configurations/Hephestos/Configuration.h b/Marlin/example_configurations/Hephestos/Configuration.h
index 395bb8e76..ae2c8d9be 100644
--- a/Marlin/example_configurations/Hephestos/Configuration.h
+++ b/Marlin/example_configurations/Hephestos/Configuration.h
@@ -748,6 +748,19 @@ const bool Z_MIN_PROBE_ENDSTOP_INVERTING = true; // set to true to invert the lo
 #define ABS_PREHEAT_HPB_TEMP 100
 #define ABS_PREHEAT_FAN_SPEED 255   // Insert Value between 0 and 255
 
+
+//
+// Print Counter
+//
+// When enabled Marlin will keep track of some print statistical data such as:
+//  - Total print jobs
+//  - Total successfull print jobs
+//  - Total failed print jobs
+//  - Total time printing
+//
+// This information can be viewed by the M78 command.
+//#define PRINTCOUNTER
+
 //=============================================================================
 //============================= LCD and SD support ============================
 //=============================================================================
diff --git a/Marlin/example_configurations/Hephestos_2/Configuration.h b/Marlin/example_configurations/Hephestos_2/Configuration.h
index 0dbb1d763..2e665e413 100644
--- a/Marlin/example_configurations/Hephestos_2/Configuration.h
+++ b/Marlin/example_configurations/Hephestos_2/Configuration.h
@@ -750,6 +750,19 @@ const bool Z_MIN_PROBE_ENDSTOP_INVERTING = false; // set to true to invert the l
 #define ABS_PREHEAT_HPB_TEMP    110
 #define ABS_PREHEAT_FAN_SPEED   0   // Insert Value between 0 and 255
 
+
+//
+// Print Counter
+//
+// When enabled Marlin will keep track of some print statistical data such as:
+//  - Total print jobs
+//  - Total successfull print jobs
+//  - Total failed print jobs
+//  - Total time printing
+//
+// This information can be viewed by the M78 command.
+//#define PRINTCOUNTER
+
 //=============================================================================
 //============================= LCD and SD support ============================
 //=============================================================================
diff --git a/Marlin/example_configurations/K8200/Configuration.h b/Marlin/example_configurations/K8200/Configuration.h
index 0d43cd2c3..c5412f494 100644
--- a/Marlin/example_configurations/K8200/Configuration.h
+++ b/Marlin/example_configurations/K8200/Configuration.h
@@ -773,6 +773,19 @@ const bool Z_MIN_PROBE_ENDSTOP_INVERTING = false; // set to true to invert the l
 #define ABS_PREHEAT_HPB_TEMP 60 // K8200: set back to 110 if you have an upgraded heatbed power supply
 #define ABS_PREHEAT_FAN_SPEED 0   // Insert Value between 0 and 255
 
+
+//
+// Print Counter
+//
+// When enabled Marlin will keep track of some print statistical data such as:
+//  - Total print jobs
+//  - Total successfull print jobs
+//  - Total failed print jobs
+//  - Total time printing
+//
+// This information can be viewed by the M78 command.
+//#define PRINTCOUNTER
+
 //=============================================================================
 //============================= LCD and SD support ============================
 //=============================================================================
diff --git a/Marlin/example_configurations/RepRapWorld/Megatronics/Configuration.h b/Marlin/example_configurations/RepRapWorld/Megatronics/Configuration.h
index 3f6208345..40ff70b53 100644
--- a/Marlin/example_configurations/RepRapWorld/Megatronics/Configuration.h
+++ b/Marlin/example_configurations/RepRapWorld/Megatronics/Configuration.h
@@ -756,6 +756,19 @@ const bool Z_MIN_PROBE_ENDSTOP_INVERTING = false; // set to true to invert the l
 #define ABS_PREHEAT_HPB_TEMP 110
 #define ABS_PREHEAT_FAN_SPEED 0   // Insert Value between 0 and 255
 
+
+//
+// Print Counter
+//
+// When enabled Marlin will keep track of some print statistical data such as:
+//  - Total print jobs
+//  - Total successfull print jobs
+//  - Total failed print jobs
+//  - Total time printing
+//
+// This information can be viewed by the M78 command.
+//#define PRINTCOUNTER
+
 //=============================================================================
 //============================= LCD and SD support ============================
 //=============================================================================
diff --git a/Marlin/example_configurations/RigidBot/Configuration.h b/Marlin/example_configurations/RigidBot/Configuration.h
index 82b66ef9d..47d643363 100644
--- a/Marlin/example_configurations/RigidBot/Configuration.h
+++ b/Marlin/example_configurations/RigidBot/Configuration.h
@@ -1,4 +1,4 @@
-/**
+f/**
  * Marlin 3D Printer Firmware
  * Copyright (C) 2016 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
  *
@@ -751,6 +751,19 @@ const bool Z_MIN_PROBE_ENDSTOP_INVERTING = false; // set to true to invert the l
 #define ABS_PREHEAT_HPB_TEMP 110
 #define ABS_PREHEAT_FAN_SPEED 255   // Insert Value between 0 and 255
 
+
+//
+// Print Counter
+//
+// When enabled Marlin will keep track of some print statistical data such as:
+//  - Total print jobs
+//  - Total successfull print jobs
+//  - Total failed print jobs
+//  - Total time printing
+//
+// This information can be viewed by the M78 command.
+//#define PRINTCOUNTER
+
 //=============================================================================
 //============================= LCD and SD support ============================
 //=============================================================================
diff --git a/Marlin/example_configurations/SCARA/Configuration.h b/Marlin/example_configurations/SCARA/Configuration.h
index 808bf7e62..098608e0f 100644
--- a/Marlin/example_configurations/SCARA/Configuration.h
+++ b/Marlin/example_configurations/SCARA/Configuration.h
@@ -764,6 +764,19 @@ const bool Z_MIN_PROBE_ENDSTOP_INVERTING = false; // set to true to invert the l
 #define ABS_PREHEAT_HPB_TEMP 100
 #define ABS_PREHEAT_FAN_SPEED 255   // Insert Value between 0 and 255
 
+
+//
+// Print Counter
+//
+// When enabled Marlin will keep track of some print statistical data such as:
+//  - Total print jobs
+//  - Total successfull print jobs
+//  - Total failed print jobs
+//  - Total time printing
+//
+// This information can be viewed by the M78 command.
+//#define PRINTCOUNTER
+
 //=============================================================================
 //============================= LCD and SD support ============================
 //=============================================================================
diff --git a/Marlin/example_configurations/TAZ4/Configuration.h b/Marlin/example_configurations/TAZ4/Configuration.h
index 6c8165ea0..cacd13390 100644
--- a/Marlin/example_configurations/TAZ4/Configuration.h
+++ b/Marlin/example_configurations/TAZ4/Configuration.h
@@ -777,6 +777,19 @@ const bool Z_MIN_PROBE_ENDSTOP_INVERTING = false; // set to true to invert the l
 #define ABS_PREHEAT_HPB_TEMP 110
 #define ABS_PREHEAT_FAN_SPEED 0   // Insert Value between 0 and 255
 
+
+//
+// Print Counter
+//
+// When enabled Marlin will keep track of some print statistical data such as:
+//  - Total print jobs
+//  - Total successfull print jobs
+//  - Total failed print jobs
+//  - Total time printing
+//
+// This information can be viewed by the M78 command.
+//#define PRINTCOUNTER
+
 //=============================================================================
 //============================= LCD and SD support ============================
 //=============================================================================
diff --git a/Marlin/example_configurations/WITBOX/Configuration.h b/Marlin/example_configurations/WITBOX/Configuration.h
index 434143e38..9808e8560 100644
--- a/Marlin/example_configurations/WITBOX/Configuration.h
+++ b/Marlin/example_configurations/WITBOX/Configuration.h
@@ -748,6 +748,19 @@ const bool Z_MIN_PROBE_ENDSTOP_INVERTING = true; // set to true to invert the lo
 #define ABS_PREHEAT_HPB_TEMP 100
 #define ABS_PREHEAT_FAN_SPEED 255   // Insert Value between 0 and 255
 
+
+//
+// Print Counter
+//
+// When enabled Marlin will keep track of some print statistical data such as:
+//  - Total print jobs
+//  - Total successfull print jobs
+//  - Total failed print jobs
+//  - Total time printing
+//
+// This information can be viewed by the M78 command.
+//#define PRINTCOUNTER
+
 //=============================================================================
 //============================= LCD and SD support ============================
 //=============================================================================
diff --git a/Marlin/example_configurations/adafruit/ST7565/Configuration.h b/Marlin/example_configurations/adafruit/ST7565/Configuration.h
index f941bb0d1..ffe72ebea 100644
--- a/Marlin/example_configurations/adafruit/ST7565/Configuration.h
+++ b/Marlin/example_configurations/adafruit/ST7565/Configuration.h
@@ -756,6 +756,19 @@ const bool Z_MIN_PROBE_ENDSTOP_INVERTING = false; // set to true to invert the l
 #define ABS_PREHEAT_HPB_TEMP 110
 #define ABS_PREHEAT_FAN_SPEED 0   // Insert Value between 0 and 255
 
+
+//
+// Print Counter
+//
+// When enabled Marlin will keep track of some print statistical data such as:
+//  - Total print jobs
+//  - Total successfull print jobs
+//  - Total failed print jobs
+//  - Total time printing
+//
+// This information can be viewed by the M78 command.
+//#define PRINTCOUNTER
+
 //=============================================================================
 //============================= LCD and SD support ============================
 //=============================================================================
diff --git a/Marlin/example_configurations/delta/biv2.5/Configuration.h b/Marlin/example_configurations/delta/biv2.5/Configuration.h
index 40d6e9af8..ed5e5dc86 100644
--- a/Marlin/example_configurations/delta/biv2.5/Configuration.h
+++ b/Marlin/example_configurations/delta/biv2.5/Configuration.h
@@ -885,6 +885,19 @@ const bool Z_MIN_PROBE_ENDSTOP_INVERTING = true; // set to true to invert the lo
 #define ABS_PREHEAT_HPB_TEMP 100
 #define ABS_PREHEAT_FAN_SPEED 255   // Insert Value between 0 and 255
 
+
+//
+// Print Counter
+//
+// When enabled Marlin will keep track of some print statistical data such as:
+//  - Total print jobs
+//  - Total successfull print jobs
+//  - Total failed print jobs
+//  - Total time printing
+//
+// This information can be viewed by the M78 command.
+//#define PRINTCOUNTER
+
 //=============================================================================
 //============================= LCD and SD support ============================
 //=============================================================================
diff --git a/Marlin/example_configurations/delta/generic/Configuration.h b/Marlin/example_configurations/delta/generic/Configuration.h
index c492573f5..3f9a20dd8 100644
--- a/Marlin/example_configurations/delta/generic/Configuration.h
+++ b/Marlin/example_configurations/delta/generic/Configuration.h
@@ -885,6 +885,19 @@ const bool Z_MIN_PROBE_ENDSTOP_INVERTING = true; // set to true to invert the lo
 #define ABS_PREHEAT_HPB_TEMP 100
 #define ABS_PREHEAT_FAN_SPEED 255   // Insert Value between 0 and 255
 
+
+//
+// Print Counter
+//
+// When enabled Marlin will keep track of some print statistical data such as:
+//  - Total print jobs
+//  - Total successfull print jobs
+//  - Total failed print jobs
+//  - Total time printing
+//
+// This information can be viewed by the M78 command.
+//#define PRINTCOUNTER
+
 //=============================================================================
 //============================= LCD and SD support ============================
 //=============================================================================
diff --git a/Marlin/example_configurations/delta/kossel_mini/Configuration.h b/Marlin/example_configurations/delta/kossel_mini/Configuration.h
index e77eb3379..f2cbba422 100644
--- a/Marlin/example_configurations/delta/kossel_mini/Configuration.h
+++ b/Marlin/example_configurations/delta/kossel_mini/Configuration.h
@@ -889,6 +889,19 @@ const bool Z_MIN_PROBE_ENDSTOP_INVERTING = false; // set to true to invert the l
 #define ABS_PREHEAT_HPB_TEMP 100
 #define ABS_PREHEAT_FAN_SPEED 255   // Insert Value between 0 and 255
 
+
+//
+// Print Counter
+//
+// When enabled Marlin will keep track of some print statistical data such as:
+//  - Total print jobs
+//  - Total successfull print jobs
+//  - Total failed print jobs
+//  - Total time printing
+//
+// This information can be viewed by the M78 command.
+//#define PRINTCOUNTER
+
 //=============================================================================
 //============================= LCD and SD support ============================
 //=============================================================================
diff --git a/Marlin/example_configurations/delta/kossel_pro/Configuration.h b/Marlin/example_configurations/delta/kossel_pro/Configuration.h
index b5c9c76c6..dc759e69a 100644
--- a/Marlin/example_configurations/delta/kossel_pro/Configuration.h
+++ b/Marlin/example_configurations/delta/kossel_pro/Configuration.h
@@ -882,6 +882,19 @@ const bool Z_MIN_PROBE_ENDSTOP_INVERTING = false; // set to true to invert the l
 #define ABS_PREHEAT_HPB_TEMP 100
 #define ABS_PREHEAT_FAN_SPEED 255   // Insert Value between 0 and 255
 
+
+//
+// Print Counter
+//
+// When enabled Marlin will keep track of some print statistical data such as:
+//  - Total print jobs
+//  - Total successfull print jobs
+//  - Total failed print jobs
+//  - Total time printing
+//
+// This information can be viewed by the M78 command.
+//#define PRINTCOUNTER
+
 //=============================================================================
 //============================= LCD and SD support ============================
 //=============================================================================
diff --git a/Marlin/example_configurations/delta/kossel_xl/Configuration.h b/Marlin/example_configurations/delta/kossel_xl/Configuration.h
index 943443fb4..f26762fba 100644
--- a/Marlin/example_configurations/delta/kossel_xl/Configuration.h
+++ b/Marlin/example_configurations/delta/kossel_xl/Configuration.h
@@ -890,6 +890,19 @@ const bool Z_MIN_PROBE_ENDSTOP_INVERTING = false; // set to true to invert the l
 #define ABS_PREHEAT_HPB_TEMP 100
 #define ABS_PREHEAT_FAN_SPEED 255   // Insert Value between 0 and 255
 
+
+//
+// Print Counter
+//
+// When enabled Marlin will keep track of some print statistical data such as:
+//  - Total print jobs
+//  - Total successfull print jobs
+//  - Total failed print jobs
+//  - Total time printing
+//
+// This information can be viewed by the M78 command.
+//#define PRINTCOUNTER
+
 //=============================================================================
 //============================= LCD and SD support ============================
 //=============================================================================
diff --git a/Marlin/example_configurations/makibox/Configuration.h b/Marlin/example_configurations/makibox/Configuration.h
index 2b414100f..456c34f8c 100644
--- a/Marlin/example_configurations/makibox/Configuration.h
+++ b/Marlin/example_configurations/makibox/Configuration.h
@@ -759,6 +759,19 @@ const bool Z_MIN_PROBE_ENDSTOP_INVERTING = false; // set to true to invert the l
 #define ABS_PREHEAT_HPB_TEMP 100
 #define ABS_PREHEAT_FAN_SPEED 255   // Insert Value between 0 and 255
 
+
+//
+// Print Counter
+//
+// When enabled Marlin will keep track of some print statistical data such as:
+//  - Total print jobs
+//  - Total successfull print jobs
+//  - Total failed print jobs
+//  - Total time printing
+//
+// This information can be viewed by the M78 command.
+//#define PRINTCOUNTER
+
 //=============================================================================
 //============================= LCD and SD support ============================
 //=============================================================================
diff --git a/Marlin/example_configurations/tvrrug/Round2/Configuration.h b/Marlin/example_configurations/tvrrug/Round2/Configuration.h
index 59cfe714d..c57dbad8b 100644
--- a/Marlin/example_configurations/tvrrug/Round2/Configuration.h
+++ b/Marlin/example_configurations/tvrrug/Round2/Configuration.h
@@ -750,6 +750,19 @@ const bool Z_MIN_PROBE_ENDSTOP_INVERTING = true; // set to true to invert the lo
 #define ABS_PREHEAT_HPB_TEMP 100
 #define ABS_PREHEAT_FAN_SPEED 255   // Insert Value between 0 and 255
 
+
+//
+// Print Counter
+//
+// When enabled Marlin will keep track of some print statistical data such as:
+//  - Total print jobs
+//  - Total successfull print jobs
+//  - Total failed print jobs
+//  - Total time printing
+//
+// This information can be viewed by the M78 command.
+//#define PRINTCOUNTER
+
 //=============================================================================
 //============================= LCD and SD support ============================
 //=============================================================================

From 1491d682fbf25dd97a683fe6ac24bafe10c72a51 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jo=C3=A3o=20Br=C3=A1zio?= <jbrazio@gmail.com>
Date: Thu, 28 Apr 2016 15:40:24 +0100
Subject: [PATCH 09/10] Miscellaneous tweaks on PrintCounter

---
 Marlin/Marlin_main.cpp  | 4 ++++
 Marlin/printcounter.cpp | 8 ++++----
 Marlin/printcounter.h   | 5 ++---
 3 files changed, 10 insertions(+), 7 deletions(-)

diff --git a/Marlin/Marlin_main.cpp b/Marlin/Marlin_main.cpp
index 2ddb33096..b0e576969 100644
--- a/Marlin/Marlin_main.cpp
+++ b/Marlin/Marlin_main.cpp
@@ -137,6 +137,10 @@
  * M33  - Get the longname version of a path
  * M42  - Change pin status via gcode Use M42 Px Sy to set pin x to value y, when omitting Px the onboard led will be used.
  * M48  - Measure Z_Probe repeatability. M48 [P # of points] [X position] [Y position] [V_erboseness #] [E_ngage Probe] [L # of legs of travel]
+ * M75  - Start the print job timer
+ * M76  - Pause the print job timer
+ * M77  - Stop the print job timer
+ * M78  - Show statistical information about the print jobs
  * M80  - Turn on Power Supply
  * M81  - Turn off Power Supply
  * M82  - Set E codes absolute (default)
diff --git a/Marlin/printcounter.cpp b/Marlin/printcounter.cpp
index c29cc8fb2..59b8bc3e3 100644
--- a/Marlin/printcounter.cpp
+++ b/Marlin/printcounter.cpp
@@ -51,7 +51,7 @@ void PrintCounter::initStats() {
   this->data = { 0, 0, 0, 0 };
 
   this->saveStats();
-  eeprom_write_byte((uint8_t*) this->addr, 0x16);
+  eeprom_write_byte((uint8_t *) this->address, 0x16);
 }
 
 void PrintCounter::loadStats() {
@@ -60,8 +60,8 @@ void PrintCounter::loadStats() {
   #endif
 
   // Checks if the EEPROM block is initialized
-  if (eeprom_read_byte((uint8_t*) this->addr) != 0x16) this->initStats();
-  else eeprom_read_block(&this->data, (void *)(this->addr + sizeof(uint8_t)), sizeof(printStatistics));
+  if (eeprom_read_byte((uint8_t *) this->address) != 0x16) this->initStats();
+  else eeprom_read_block(&this->data, (void *)(this->address + sizeof(uint8_t)), sizeof(printStatistics));
 
   this->loaded = true;
 }
@@ -74,7 +74,7 @@ void PrintCounter::saveStats() {
   // Refuses to save data is object is not loaded
   if (!this->isLoaded()) return;
 
-  eeprom_write_block(&this->data, (void *)(this->addr + sizeof(uint8_t)), sizeof(printStatistics));
+  eeprom_update_block(&this->data, (void *)(this->address + sizeof(uint8_t)), sizeof(printStatistics));
 }
 
 void PrintCounter::showStats() {
diff --git a/Marlin/printcounter.h b/Marlin/printcounter.h
index 05f704a5b..b44caeefd 100644
--- a/Marlin/printcounter.h
+++ b/Marlin/printcounter.h
@@ -47,13 +47,12 @@ class PrintCounter: public Stopwatch {
      * @brief EEPROM address
      * @details Defines the start offset address where the data is stored.
      */
-    const uint16_t addr = 50;
+    const uint16_t address = 0x32;
 
     /**
      * @brief Interval in seconds between counter updates
      * @details This const value defines what will be the time between each
-     * accumulator update. This is different from the EEPROM save interval
-     * which is user defined at the Configuration.h file.
+     * accumulator update. This is different from the EEPROM save interval.
      */
     const uint16_t updateInterval = 10;
 

From e34f4653ef8f762686bce7c5c0a406dc0fb902c3 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jo=C3=A3o=20Br=C3=A1zio?= <jbrazio@gmail.com>
Date: Fri, 29 Apr 2016 23:13:10 +0100
Subject: [PATCH 10/10] Fixed a typo on the configuration files

---
 Marlin/Configuration.h                                          | 2 +-
 Marlin/example_configurations/Felix/Configuration.h             | 2 +-
 Marlin/example_configurations/Hephestos/Configuration.h         | 2 +-
 Marlin/example_configurations/Hephestos_2/Configuration.h       | 2 +-
 Marlin/example_configurations/K8200/Configuration.h             | 2 +-
 .../RepRapWorld/Megatronics/Configuration.h                     | 2 +-
 Marlin/example_configurations/RigidBot/Configuration.h          | 2 +-
 Marlin/example_configurations/SCARA/Configuration.h             | 2 +-
 Marlin/example_configurations/TAZ4/Configuration.h              | 2 +-
 Marlin/example_configurations/WITBOX/Configuration.h            | 2 +-
 Marlin/example_configurations/adafruit/ST7565/Configuration.h   | 2 +-
 Marlin/example_configurations/delta/biv2.5/Configuration.h      | 2 +-
 Marlin/example_configurations/delta/generic/Configuration.h     | 2 +-
 Marlin/example_configurations/delta/kossel_mini/Configuration.h | 2 +-
 Marlin/example_configurations/delta/kossel_pro/Configuration.h  | 2 +-
 Marlin/example_configurations/delta/kossel_xl/Configuration.h   | 2 +-
 Marlin/example_configurations/makibox/Configuration.h           | 2 +-
 Marlin/example_configurations/tvrrug/Round2/Configuration.h     | 2 +-
 18 files changed, 18 insertions(+), 18 deletions(-)

diff --git a/Marlin/Configuration.h b/Marlin/Configuration.h
index c9a6245e9..49b31d406 100644
--- a/Marlin/Configuration.h
+++ b/Marlin/Configuration.h
@@ -763,7 +763,7 @@ const bool Z_MIN_PROBE_ENDSTOP_INVERTING = false; // set to true to invert the l
 //
 // When enabled Marlin will keep track of some print statistical data such as:
 //  - Total print jobs
-//  - Total successfull print jobs
+//  - Total successful print jobs
 //  - Total failed print jobs
 //  - Total time printing
 //
diff --git a/Marlin/example_configurations/Felix/Configuration.h b/Marlin/example_configurations/Felix/Configuration.h
index 719018da9..39f89f330 100644
--- a/Marlin/example_configurations/Felix/Configuration.h
+++ b/Marlin/example_configurations/Felix/Configuration.h
@@ -745,7 +745,7 @@ const bool Z_MIN_PROBE_ENDSTOP_INVERTING = false; // set to true to invert the l
 //
 // When enabled Marlin will keep track of some print statistical data such as:
 //  - Total print jobs
-//  - Total successfull print jobs
+//  - Total successful print jobs
 //  - Total failed print jobs
 //  - Total time printing
 //
diff --git a/Marlin/example_configurations/Hephestos/Configuration.h b/Marlin/example_configurations/Hephestos/Configuration.h
index ae2c8d9be..d1ddfa2b1 100644
--- a/Marlin/example_configurations/Hephestos/Configuration.h
+++ b/Marlin/example_configurations/Hephestos/Configuration.h
@@ -754,7 +754,7 @@ const bool Z_MIN_PROBE_ENDSTOP_INVERTING = true; // set to true to invert the lo
 //
 // When enabled Marlin will keep track of some print statistical data such as:
 //  - Total print jobs
-//  - Total successfull print jobs
+//  - Total successful print jobs
 //  - Total failed print jobs
 //  - Total time printing
 //
diff --git a/Marlin/example_configurations/Hephestos_2/Configuration.h b/Marlin/example_configurations/Hephestos_2/Configuration.h
index 2e665e413..7a3264b26 100644
--- a/Marlin/example_configurations/Hephestos_2/Configuration.h
+++ b/Marlin/example_configurations/Hephestos_2/Configuration.h
@@ -756,7 +756,7 @@ const bool Z_MIN_PROBE_ENDSTOP_INVERTING = false; // set to true to invert the l
 //
 // When enabled Marlin will keep track of some print statistical data such as:
 //  - Total print jobs
-//  - Total successfull print jobs
+//  - Total successful print jobs
 //  - Total failed print jobs
 //  - Total time printing
 //
diff --git a/Marlin/example_configurations/K8200/Configuration.h b/Marlin/example_configurations/K8200/Configuration.h
index c5412f494..c800fa00f 100644
--- a/Marlin/example_configurations/K8200/Configuration.h
+++ b/Marlin/example_configurations/K8200/Configuration.h
@@ -779,7 +779,7 @@ const bool Z_MIN_PROBE_ENDSTOP_INVERTING = false; // set to true to invert the l
 //
 // When enabled Marlin will keep track of some print statistical data such as:
 //  - Total print jobs
-//  - Total successfull print jobs
+//  - Total successful print jobs
 //  - Total failed print jobs
 //  - Total time printing
 //
diff --git a/Marlin/example_configurations/RepRapWorld/Megatronics/Configuration.h b/Marlin/example_configurations/RepRapWorld/Megatronics/Configuration.h
index 40ff70b53..6d41b7e97 100644
--- a/Marlin/example_configurations/RepRapWorld/Megatronics/Configuration.h
+++ b/Marlin/example_configurations/RepRapWorld/Megatronics/Configuration.h
@@ -762,7 +762,7 @@ const bool Z_MIN_PROBE_ENDSTOP_INVERTING = false; // set to true to invert the l
 //
 // When enabled Marlin will keep track of some print statistical data such as:
 //  - Total print jobs
-//  - Total successfull print jobs
+//  - Total successful print jobs
 //  - Total failed print jobs
 //  - Total time printing
 //
diff --git a/Marlin/example_configurations/RigidBot/Configuration.h b/Marlin/example_configurations/RigidBot/Configuration.h
index 47d643363..d0e47bd66 100644
--- a/Marlin/example_configurations/RigidBot/Configuration.h
+++ b/Marlin/example_configurations/RigidBot/Configuration.h
@@ -757,7 +757,7 @@ const bool Z_MIN_PROBE_ENDSTOP_INVERTING = false; // set to true to invert the l
 //
 // When enabled Marlin will keep track of some print statistical data such as:
 //  - Total print jobs
-//  - Total successfull print jobs
+//  - Total successful print jobs
 //  - Total failed print jobs
 //  - Total time printing
 //
diff --git a/Marlin/example_configurations/SCARA/Configuration.h b/Marlin/example_configurations/SCARA/Configuration.h
index 098608e0f..79f68392f 100644
--- a/Marlin/example_configurations/SCARA/Configuration.h
+++ b/Marlin/example_configurations/SCARA/Configuration.h
@@ -770,7 +770,7 @@ const bool Z_MIN_PROBE_ENDSTOP_INVERTING = false; // set to true to invert the l
 //
 // When enabled Marlin will keep track of some print statistical data such as:
 //  - Total print jobs
-//  - Total successfull print jobs
+//  - Total successful print jobs
 //  - Total failed print jobs
 //  - Total time printing
 //
diff --git a/Marlin/example_configurations/TAZ4/Configuration.h b/Marlin/example_configurations/TAZ4/Configuration.h
index cacd13390..135185861 100644
--- a/Marlin/example_configurations/TAZ4/Configuration.h
+++ b/Marlin/example_configurations/TAZ4/Configuration.h
@@ -783,7 +783,7 @@ const bool Z_MIN_PROBE_ENDSTOP_INVERTING = false; // set to true to invert the l
 //
 // When enabled Marlin will keep track of some print statistical data such as:
 //  - Total print jobs
-//  - Total successfull print jobs
+//  - Total successful print jobs
 //  - Total failed print jobs
 //  - Total time printing
 //
diff --git a/Marlin/example_configurations/WITBOX/Configuration.h b/Marlin/example_configurations/WITBOX/Configuration.h
index 9808e8560..0e9cfd36b 100644
--- a/Marlin/example_configurations/WITBOX/Configuration.h
+++ b/Marlin/example_configurations/WITBOX/Configuration.h
@@ -754,7 +754,7 @@ const bool Z_MIN_PROBE_ENDSTOP_INVERTING = true; // set to true to invert the lo
 //
 // When enabled Marlin will keep track of some print statistical data such as:
 //  - Total print jobs
-//  - Total successfull print jobs
+//  - Total successful print jobs
 //  - Total failed print jobs
 //  - Total time printing
 //
diff --git a/Marlin/example_configurations/adafruit/ST7565/Configuration.h b/Marlin/example_configurations/adafruit/ST7565/Configuration.h
index ffe72ebea..111f5797e 100644
--- a/Marlin/example_configurations/adafruit/ST7565/Configuration.h
+++ b/Marlin/example_configurations/adafruit/ST7565/Configuration.h
@@ -762,7 +762,7 @@ const bool Z_MIN_PROBE_ENDSTOP_INVERTING = false; // set to true to invert the l
 //
 // When enabled Marlin will keep track of some print statistical data such as:
 //  - Total print jobs
-//  - Total successfull print jobs
+//  - Total successful print jobs
 //  - Total failed print jobs
 //  - Total time printing
 //
diff --git a/Marlin/example_configurations/delta/biv2.5/Configuration.h b/Marlin/example_configurations/delta/biv2.5/Configuration.h
index ed5e5dc86..4a31e15cc 100644
--- a/Marlin/example_configurations/delta/biv2.5/Configuration.h
+++ b/Marlin/example_configurations/delta/biv2.5/Configuration.h
@@ -891,7 +891,7 @@ const bool Z_MIN_PROBE_ENDSTOP_INVERTING = true; // set to true to invert the lo
 //
 // When enabled Marlin will keep track of some print statistical data such as:
 //  - Total print jobs
-//  - Total successfull print jobs
+//  - Total successful print jobs
 //  - Total failed print jobs
 //  - Total time printing
 //
diff --git a/Marlin/example_configurations/delta/generic/Configuration.h b/Marlin/example_configurations/delta/generic/Configuration.h
index 3f9a20dd8..c3d7b149c 100644
--- a/Marlin/example_configurations/delta/generic/Configuration.h
+++ b/Marlin/example_configurations/delta/generic/Configuration.h
@@ -891,7 +891,7 @@ const bool Z_MIN_PROBE_ENDSTOP_INVERTING = true; // set to true to invert the lo
 //
 // When enabled Marlin will keep track of some print statistical data such as:
 //  - Total print jobs
-//  - Total successfull print jobs
+//  - Total successful print jobs
 //  - Total failed print jobs
 //  - Total time printing
 //
diff --git a/Marlin/example_configurations/delta/kossel_mini/Configuration.h b/Marlin/example_configurations/delta/kossel_mini/Configuration.h
index f2cbba422..fb38d6e0a 100644
--- a/Marlin/example_configurations/delta/kossel_mini/Configuration.h
+++ b/Marlin/example_configurations/delta/kossel_mini/Configuration.h
@@ -895,7 +895,7 @@ const bool Z_MIN_PROBE_ENDSTOP_INVERTING = false; // set to true to invert the l
 //
 // When enabled Marlin will keep track of some print statistical data such as:
 //  - Total print jobs
-//  - Total successfull print jobs
+//  - Total successful print jobs
 //  - Total failed print jobs
 //  - Total time printing
 //
diff --git a/Marlin/example_configurations/delta/kossel_pro/Configuration.h b/Marlin/example_configurations/delta/kossel_pro/Configuration.h
index dc759e69a..5236cf5cb 100644
--- a/Marlin/example_configurations/delta/kossel_pro/Configuration.h
+++ b/Marlin/example_configurations/delta/kossel_pro/Configuration.h
@@ -888,7 +888,7 @@ const bool Z_MIN_PROBE_ENDSTOP_INVERTING = false; // set to true to invert the l
 //
 // When enabled Marlin will keep track of some print statistical data such as:
 //  - Total print jobs
-//  - Total successfull print jobs
+//  - Total successful print jobs
 //  - Total failed print jobs
 //  - Total time printing
 //
diff --git a/Marlin/example_configurations/delta/kossel_xl/Configuration.h b/Marlin/example_configurations/delta/kossel_xl/Configuration.h
index f26762fba..1c14c3f05 100644
--- a/Marlin/example_configurations/delta/kossel_xl/Configuration.h
+++ b/Marlin/example_configurations/delta/kossel_xl/Configuration.h
@@ -896,7 +896,7 @@ const bool Z_MIN_PROBE_ENDSTOP_INVERTING = false; // set to true to invert the l
 //
 // When enabled Marlin will keep track of some print statistical data such as:
 //  - Total print jobs
-//  - Total successfull print jobs
+//  - Total successful print jobs
 //  - Total failed print jobs
 //  - Total time printing
 //
diff --git a/Marlin/example_configurations/makibox/Configuration.h b/Marlin/example_configurations/makibox/Configuration.h
index 456c34f8c..17da23c62 100644
--- a/Marlin/example_configurations/makibox/Configuration.h
+++ b/Marlin/example_configurations/makibox/Configuration.h
@@ -765,7 +765,7 @@ const bool Z_MIN_PROBE_ENDSTOP_INVERTING = false; // set to true to invert the l
 //
 // When enabled Marlin will keep track of some print statistical data such as:
 //  - Total print jobs
-//  - Total successfull print jobs
+//  - Total successful print jobs
 //  - Total failed print jobs
 //  - Total time printing
 //
diff --git a/Marlin/example_configurations/tvrrug/Round2/Configuration.h b/Marlin/example_configurations/tvrrug/Round2/Configuration.h
index c57dbad8b..22b890865 100644
--- a/Marlin/example_configurations/tvrrug/Round2/Configuration.h
+++ b/Marlin/example_configurations/tvrrug/Round2/Configuration.h
@@ -756,7 +756,7 @@ const bool Z_MIN_PROBE_ENDSTOP_INVERTING = true; // set to true to invert the lo
 //
 // When enabled Marlin will keep track of some print statistical data such as:
 //  - Total print jobs
-//  - Total successfull print jobs
+//  - Total successful print jobs
 //  - Total failed print jobs
 //  - Total time printing
 //