Chamber Heater PID (#21156)

Co-authored-by: Scott Lahteine <thinkyhead@users.noreply.github.com>

Marlin/src/inc/Conditionals_post.h

@@ -1992,27 +1992,31 @@
     #define BED_OVERSHOOT 10
   #endif
   #define BED_MAX_TARGET (BED_MAXTEMP - (BED_OVERSHOOT))
+#else
+  #undef PIDTEMPBED
 #endif
+
 #if HAS_HEATED_BED || HAS_TEMP_CHAMBER
   #define BED_OR_CHAMBER 1
 #endif
 #if HAS_TEMP_HOTEND || BED_OR_CHAMBER || HAS_TEMP_PROBE
   #define HAS_TEMP_SENSOR 1
 #endif
+
 #if HAS_TEMP_CHAMBER && PIN_EXISTS(HEATER_CHAMBER)
   #define HAS_HEATED_CHAMBER 1
+  #ifndef CHAMBER_OVERSHOOT
+    #define CHAMBER_OVERSHOOT 10
+  #endif
+  #define CHAMBER_MAX_TARGET (CHAMBER_MAXTEMP - (CHAMBER_OVERSHOOT))
+#else
+  #undef PIDTEMPCHAMBER
 #endif
 
 // PID heating
-#if !HAS_HEATED_BED
-  #undef PIDTEMPBED
-#endif
-#if EITHER(PIDTEMP, PIDTEMPBED)
+#if ANY(PIDTEMP, PIDTEMPBED, PIDTEMPCHAMBER)
   #define HAS_PID_HEATING 1
 #endif
-#if BOTH(PIDTEMP, PIDTEMPBED)
-  #define HAS_PID_FOR_BOTH 1
-#endif
 
 // Thermal protection
 #if BOTH(HAS_HEATED_BED, THERMAL_PROTECTION_BED)
@@ -2346,6 +2350,9 @@
  * Heated chamber requires settings
  */
 #if HAS_HEATED_CHAMBER
+  #ifndef MIN_CHAMBER_POWER
+    #define MIN_CHAMBER_POWER 0
+  #endif
   #ifndef MAX_CHAMBER_POWER
     #define MAX_CHAMBER_POWER 255
   #endif

Marlin/src/inc/SanityCheck.h

@@ -1203,6 +1203,13 @@ static_assert(Y_MAX_LENGTH >= Y_BED_SIZE, "Movement bounds (Y_MIN_POS, Y_MAX_POS
   #error "To use BED_LIMIT_SWITCHING you must disable PIDTEMPBED."
 #endif
 
+/**
+ * Chamber Heating Options - PID vs Limit Switching
+ */
+#if BOTH(PIDTEMPCHAMBER, CHAMBER_LIMIT_SWITCHING)
+  #error "To use CHAMBER_LIMIT_SWITCHING you must disable PIDTEMPCHAMBER."
+#endif
+
 /**
  * Kinematics
  */