From 424d5495e46b7cb3f59ab631b44d8b395e7b1753 Mon Sep 17 00:00:00 2001
From: Scott Lahteine <sourcetree@thinkyhead.com>
Date: Fri, 3 Apr 2015 16:38:05 -0700
Subject: [PATCH] Add PIDTEMPBED to EEPROM

---
 Marlin/ConfigurationStore.cpp | 87 ++++++++++++++++++++++++++---------
 Marlin/temperature.h          |  2 +-
 2 files changed, 65 insertions(+), 24 deletions(-)

diff --git a/Marlin/ConfigurationStore.cpp b/Marlin/ConfigurationStore.cpp
index b1da94a300..3ed585f823 100644
--- a/Marlin/ConfigurationStore.cpp
+++ b/Marlin/ConfigurationStore.cpp
@@ -3,7 +3,21 @@
  *
  * Configuration and EEPROM storage
  *
- * V16 EEPROM Layout:
+ * IMPORTANT:  Whenever there are changes made to the variables stored in EEPROM
+ * in the functions below, also increment the version number. This makes sure that
+ * the default values are used whenever there is a change to the data, to prevent
+ * wrong data being written to the variables.
+ *
+ * ALSO: Variables in the Store and Retrieve sections must be in the same order.
+ *       If a feature is disabled, some data must still be written that, when read,
+ *       either sets a Sane Default, or results in No Change to the existing value.
+ *
+ */
+
+#define EEPROM_VERSION "V19"
+
+/**
+ * V19 EEPROM Layout:
  *
  *  ver
  *  axis_steps_per_unit (x4)
@@ -47,6 +61,9 @@
  *  Kp[2], Ki[2], Kd[2], Kc[2]
  *  Kp[3], Ki[3], Kd[3], Kc[3]
  *
+ * PIDTEMPBED:
+ *  bedKp, bedKi, bedKd
+ *
  * DOGLCD:
  *  lcd_contrast
  *
@@ -111,15 +128,6 @@ void _EEPROM_readData(int &pos, uint8_t* value, uint8_t size) {
 
 #define EEPROM_OFFSET 100
 
-
-// IMPORTANT:  Whenever there are changes made to the variables stored in EEPROM
-// in the functions below, also increment the version number. This makes sure that
-// the default values are used whenever there is a change to the data, to prevent
-// wrong data being written to the variables.
-// ALSO:  always make sure the variables in the Store and retrieve sections are in the same order.
-
-#define EEPROM_VERSION "V18"
-
 #ifdef EEPROM_SETTINGS
 
 void Config_StoreSettings()  {
@@ -194,7 +202,6 @@ void Config_StoreSettings()  {
   EEPROM_WRITE_VAR(i, absPreheatHPBTemp);
   EEPROM_WRITE_VAR(i, absPreheatFanSpeed);
 
-
   for (int e = 0; e < 4; e++) {
 
     #ifdef PIDTEMP
@@ -209,12 +216,10 @@ void Config_StoreSettings()  {
           EEPROM_WRITE_VAR(i, dummy);
         #endif
       }
-      else {
-    #else // !PIDTEMP
-      {
+      else
     #endif // !PIDTEMP
-
-        dummy = DUMMY_PID_VALUE;
+      {
+        dummy = DUMMY_PID_VALUE; // When read, will not change the existing value
         EEPROM_WRITE_VAR(i, dummy);
         dummy = 0.0f;
         for (int q = 3; q--;) EEPROM_WRITE_VAR(i, dummy);
@@ -222,6 +227,14 @@ void Config_StoreSettings()  {
 
   } // Extruders Loop
 
+  #ifndef PIDTEMPBED
+    float bedKp = DUMMY_PID_VALUE, bedKi = DUMMY_PID_VALUE, bedKd = DUMMY_PID_VALUE;
+  #endif
+
+  EEPROM_WRITE_VAR(i, bedKp);
+  EEPROM_WRITE_VAR(i, bedKi);
+  EEPROM_WRITE_VAR(i, bedKd);
+
   #ifndef DOGLCD
     int lcd_contrast = 32;
   #endif
@@ -364,7 +377,7 @@ void Config_RetrieveSettings() {
 
     #ifdef PIDTEMP
       for (int e = 0; e < 4; e++) { // 4 = max extruders currently supported by Marlin
-        EEPROM_READ_VAR(i, dummy);
+        EEPROM_READ_VAR(i, dummy); // Kp
         if (e < EXTRUDERS && dummy != DUMMY_PID_VALUE) {
           // do not need to scale PID values as the values in EEPROM are already scaled
           PID_PARAM(Kp, e) = dummy;
@@ -385,6 +398,20 @@ void Config_RetrieveSettings() {
       for (int q=16; q--;) EEPROM_READ_VAR(i, dummy);  // 4x Kp, Ki, Kd, Kc
     #endif // !PIDTEMP
 
+    #ifndef PIDTEMPBED
+      float bedKp, bedKi, bedKd;
+    #endif
+
+    EEPROM_READ_VAR(i, dummy); // bedKp
+    if (dummy != DUMMY_PID_VALUE) {
+      bedKp = dummy;
+      EEPROM_READ_VAR(i, bedKi);
+      EEPROM_READ_VAR(i, bedKd);
+    }
+    else {
+      for (int q=2; q--;) EEPROM_READ_VAR(i, dummy); // bedKi, bedKd
+    }
+
     #ifndef DOGLCD
       int lcd_contrast;
     #endif
@@ -517,6 +544,12 @@ void Config_ResetDefault() {
     updatePID();
   #endif // PIDTEMP
 
+  #ifdef PIDTEMPBED
+    bedKp = DEFAULT_bedKp;
+    bedKi = scalePID_i(DEFAULT_bedKi);
+    bedKd = scalePID_d(DEFAULT_bedKd);
+  #endif
+
   #ifdef FWRETRACT
     autoretract_enabled = false;
     retract_length = RETRACT_LENGTH;
@@ -660,17 +693,25 @@ void Config_PrintSettings(bool forReplay) {
     SERIAL_EOL;  
   #endif // DELTA
 
-  #ifdef PIDTEMP
+  #if defined(PIDTEMP) || defined(PIDTEMPBED)
     SERIAL_ECHO_START;
     if (!forReplay) {
       SERIAL_ECHOLNPGM("PID settings:");
       SERIAL_ECHO_START;
     }
-    SERIAL_ECHOPAIR("   M301 P", PID_PARAM(Kp, 0)); // for compatibility with hosts, only echos values for E0
-    SERIAL_ECHOPAIR(" I", unscalePID_i(PID_PARAM(Ki, 0)));
-    SERIAL_ECHOPAIR(" D", unscalePID_d(PID_PARAM(Kd, 0)));
-    SERIAL_EOL;
-  #endif // PIDTEMP
+    #ifdef PIDTEMP
+      SERIAL_ECHOPAIR("   M301 P", PID_PARAM(Kp, 0)); // for compatibility with hosts, only echos values for E0
+      SERIAL_ECHOPAIR(" I", unscalePID_i(PID_PARAM(Ki, 0)));
+      SERIAL_ECHOPAIR(" D", unscalePID_d(PID_PARAM(Kd, 0)));
+      SERIAL_EOL;
+    #endif
+    #ifdef PIDTEMPBED
+      SERIAL_ECHOPAIR("   M304 P", bedKp); // for compatibility with hosts, only echos values for E0
+      SERIAL_ECHOPAIR(" I", unscalePID_i(bedKi));
+      SERIAL_ECHOPAIR(" D", unscalePID_d(bedKd));
+      SERIAL_EOL;
+    #endif
+  #endif
 
   #ifdef FWRETRACT
 
diff --git a/Marlin/temperature.h b/Marlin/temperature.h
index 79146a3556..eb080ea4c9 100644
--- a/Marlin/temperature.h
+++ b/Marlin/temperature.h
@@ -72,11 +72,11 @@ extern float current_temperature_bed;
   float unscalePID_d(float d);
 
 #endif
+
 #ifdef PIDTEMPBED
   extern float bedKp,bedKi,bedKd;
 #endif
   
-  
 #ifdef BABYSTEPPING
   extern volatile int babystepsTodo[3];
 #endif