From 3e8f9ecd1c5845f40a9c7ccc16bea92e70cc1c11 Mon Sep 17 00:00:00 2001
From: Scott Lahteine <sourcetree@thinkyhead.com>
Date: Mon, 8 Aug 2016 22:21:01 -0700
Subject: [PATCH 1/3] Extend min/max_temp_error for the bed

---
 Marlin/temperature.cpp | 24 ++++++++++++++++--------
 Marlin/temperature.h   |  4 ++--
 2 files changed, 18 insertions(+), 10 deletions(-)

diff --git a/Marlin/temperature.cpp b/Marlin/temperature.cpp
index 13a70bb85..cf78ad1aa 100644
--- a/Marlin/temperature.cpp
+++ b/Marlin/temperature.cpp
@@ -517,17 +517,25 @@ void Temperature::_temp_error(int e, const char* serial_msg, const char* lcd_msg
   #endif
 }
 
-void Temperature::max_temp_error(uint8_t e) {
-  #if HOTENDS == 1
-    UNUSED(e);
+void Temperature::max_temp_error(int8_t e) {
+  #if HAS_TEMP_BED
+    _temp_error(e, PSTR(MSG_T_MAXTEMP), e >= 0 ? PSTR(MSG_ERR_MAXTEMP) : PSTR(MSG_ERR_MAXTEMP_BED));
+  #else
+    _temp_error(HOTEND_INDEX, PSTR(MSG_T_MAXTEMP), PSTR(MSG_ERR_MAXTEMP));
+    #if HOTENDS == 1
+      UNUSED(e);
+    #endif
   #endif
-  _temp_error(HOTEND_INDEX, PSTR(MSG_T_MAXTEMP), PSTR(MSG_ERR_MAXTEMP));
 }
-void Temperature::min_temp_error(uint8_t e) {
-  #if HOTENDS == 1
-    UNUSED(e);
+void Temperature::min_temp_error(int8_t e) {
+  #if HAS_TEMP_BED
+    _temp_error(e, PSTR(MSG_T_MINTEMP), e >= 0 ? PSTR(MSG_ERR_MINTEMP) : PSTR(MSG_ERR_MINTEMP_BED));
+  #else
+    _temp_error(HOTEND_INDEX, PSTR(MSG_T_MINTEMP), PSTR(MSG_ERR_MINTEMP));
+    #if HOTENDS == 1
+      UNUSED(e);
+    #endif
   #endif
-  _temp_error(HOTEND_INDEX, PSTR(MSG_T_MINTEMP), PSTR(MSG_ERR_MINTEMP));
 }
 
 float Temperature::get_pid_output(int e) {
diff --git a/Marlin/temperature.h b/Marlin/temperature.h
index ffb47a59f..a66014ac4 100644
--- a/Marlin/temperature.h
+++ b/Marlin/temperature.h
@@ -437,8 +437,8 @@ class Temperature {
     #endif
 
     static void _temp_error(int e, const char* serial_msg, const char* lcd_msg);
-    static void min_temp_error(uint8_t e);
-    static void max_temp_error(uint8_t e);
+    static void min_temp_error(int8_t e);
+    static void max_temp_error(int8_t e);
 
     #if ENABLED(THERMAL_PROTECTION_HOTENDS) || HAS_THERMALLY_PROTECTED_BED
 

From d3ba878f703dd3e97186c6ebd1bb73bda50d404c Mon Sep 17 00:00:00 2001
From: Scott Lahteine <sourcetree@thinkyhead.com>
Date: Mon, 8 Aug 2016 22:21:32 -0700
Subject: [PATCH 2/3] Drop intermediate float in HEATER_0_USES_MAX6675 test

---
 Marlin/temperature.cpp | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/Marlin/temperature.cpp b/Marlin/temperature.cpp
index cf78ad1aa..159a732b3 100644
--- a/Marlin/temperature.cpp
+++ b/Marlin/temperature.cpp
@@ -683,9 +683,8 @@ void Temperature::manage_heater() {
   updateTemperaturesFromRawValues(); // also resets the watchdog
 
   #if ENABLED(HEATER_0_USES_MAX6675)
-    float ct = current_temperature[0];
-    if (ct > min(HEATER_0_MAXTEMP, 1023)) max_temp_error(0);
-    if (ct < max(HEATER_0_MINTEMP, 0.01)) min_temp_error(0);
+    if (current_temperature[0] > min(HEATER_0_MAXTEMP, 1023)) max_temp_error(0);
+    if (current_temperature[0] < max(HEATER_0_MINTEMP, 0.01)) min_temp_error(0);
   #endif
 
   #if (ENABLED(THERMAL_PROTECTION_HOTENDS) && WATCH_TEMP_PERIOD > 0) || (ENABLED(THERMAL_PROTECTION_BED) && WATCH_BED_TEMP_PERIOD > 0) || DISABLED(PIDTEMPBED) || HAS_AUTO_FAN

From b7b5b50a84714780857c1dc3c85a7e7bcfc9732c Mon Sep 17 00:00:00 2001
From: Scott Lahteine <sourcetree@thinkyhead.com>
Date: Mon, 8 Aug 2016 22:22:18 -0700
Subject: [PATCH 3/3] Throw bed min temp error only if heating

---
 Marlin/temperature.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Marlin/temperature.cpp b/Marlin/temperature.cpp
index 159a732b3..3bcfe3928 100644
--- a/Marlin/temperature.cpp
+++ b/Marlin/temperature.cpp
@@ -1822,8 +1822,8 @@ void Temperature::isr() {
       #else
         #define GEBED >=
       #endif
-      if (current_temperature_bed_raw GEBED bed_maxttemp_raw) _temp_error(-1, PSTR(MSG_T_MAXTEMP), PSTR(MSG_ERR_MAXTEMP_BED));
-      if (bed_minttemp_raw GEBED current_temperature_bed_raw) _temp_error(-1, PSTR(MSG_T_MINTEMP), PSTR(MSG_ERR_MINTEMP_BED));
+      if (current_temperature_bed_raw GEBED bed_maxttemp_raw) max_temp_error(-1);
+      if (bed_minttemp_raw GEBED current_temperature_bed_raw && target_temperature_bed > 0.0f) min_temp_error(-1);
     #endif
 
   } // temp_count >= OVERSAMPLENR