Long thermistor tables need special consideration

Marlin/src/module/temperature.cpp

@@ -54,10 +54,10 @@
 #if HOTEND_USES_THERMISTOR
   #if ENABLED(TEMP_SENSOR_1_AS_REDUNDANT)
     static void* heater_ttbl_map[2] = { (void*)HEATER_0_TEMPTABLE, (void*)HEATER_1_TEMPTABLE };
-    static uint8_t heater_ttbllen_map[2] = { HEATER_0_TEMPTABLE_LEN, HEATER_1_TEMPTABLE_LEN };
+    static constexpr uint8_t heater_ttbllen_map[2] = { HEATER_0_TEMPTABLE_LEN, HEATER_1_TEMPTABLE_LEN };
   #else
     static void* heater_ttbl_map[HOTENDS] = ARRAY_BY_HOTENDS((void*)HEATER_0_TEMPTABLE, (void*)HEATER_1_TEMPTABLE, (void*)HEATER_2_TEMPTABLE, (void*)HEATER_3_TEMPTABLE, (void*)HEATER_4_TEMPTABLE);
-    static uint8_t heater_ttbllen_map[HOTENDS] = ARRAY_BY_HOTENDS(HEATER_0_TEMPTABLE_LEN, HEATER_1_TEMPTABLE_LEN, HEATER_2_TEMPTABLE_LEN, HEATER_3_TEMPTABLE_LEN, HEATER_4_TEMPTABLE_LEN);
+    static constexpr uint8_t heater_ttbllen_map[HOTENDS] = ARRAY_BY_HOTENDS(HEATER_0_TEMPTABLE_LEN, HEATER_1_TEMPTABLE_LEN, HEATER_2_TEMPTABLE_LEN, HEATER_3_TEMPTABLE_LEN, HEATER_4_TEMPTABLE_LEN);
   #endif
 #endif
 

Marlin/src/module/thermistor/thermistors.h

@@ -184,20 +184,25 @@
 #ifdef THERMISTORBED
   #define BEDTEMPTABLE TT_NAME(THERMISTORBED)
   #define BEDTEMPTABLE_LEN COUNT(BEDTEMPTABLE)
-#else
-  #ifdef HEATER_BED_USES_THERMISTOR
+#elif defined(HEATER_BED_USES_THERMISTOR)
   #error "No bed thermistor table specified"
-  #endif
+#else
+  #define BEDTEMPTABLE_LEN 0
 #endif
 
 #ifdef THERMISTORCHAMBER
   #define CHAMBERTEMPTABLE TT_NAME(THERMISTORCHAMBER)
   #define CHAMBERTEMPTABLE_LEN COUNT(CHAMBERTEMPTABLE)
-#else
-  #ifdef HEATER_CHAMBER_USES_THERMISTOR
+#elif defined(HEATER_CHAMBER_USES_THERMISTOR)
   #error "No chamber thermistor table specified"
+#else
+  #define CHAMBERTEMPTABLE_LEN 0
 #endif
-#endif
+
+// The SCAN_THERMISTOR_TABLE macro needs alteration?
+static_assert(HEATER_0_TEMPTABLE_LEN < 128 && HEATER_1_TEMPTABLE_LEN < 128 && HEATER_2_TEMPTABLE_LEN < 128 && HEATER_3_TEMPTABLE_LEN < 128 && HEATER_4_TEMPTABLE_LEN < 128 && BEDTEMPTABLE_LEN < 128 && CHAMBERTEMPTABLE_LEN < 128,
+  "Temperature conversion tables over 127 entries need special consideration."
+);
 
 // Set the high and low raw values for the heaters
 // For thermistors the highest temperature results in the lowest ADC value