Option to assist thermocouple debug (#18621)

Marlin/src/module/temperature.cpp

@@ -24,6 +24,9 @@
  * temperature.cpp - temperature control
  */
 
+// Useful when debugging thermocouples
+//#define IGNORE_THERMOCOUPLE_ERRORS
+
 #include "temperature.h"
 #include "endstops.h"
 
@@ -1011,15 +1014,16 @@ void Temperature::manage_heater() {
 
   updateTemperaturesFromRawValues(); // also resets the watchdog
 
+  #if DISABLED(IGNORE_THERMOCOUPLE_ERRORS)
     #if ENABLED(HEATER_0_USES_MAX6675)
       if (temp_hotend[0].celsius > _MIN(HEATER_0_MAXTEMP, HEATER_0_MAX6675_TMAX - 1.0)) max_temp_error(H_E0);
       if (temp_hotend[0].celsius < _MAX(HEATER_0_MINTEMP, HEATER_0_MAX6675_TMIN + .01)) min_temp_error(H_E0);
     #endif
-
     #if ENABLED(HEATER_1_USES_MAX6675)
       if (temp_hotend[1].celsius > _MIN(HEATER_1_MAXTEMP, HEATER_1_MAX6675_TMAX - 1.0)) max_temp_error(H_E1);
       if (temp_hotend[1].celsius < _MAX(HEATER_1_MINTEMP, HEATER_1_MAX6675_TMIN + .01)) min_temp_error(H_E1);
     #endif
+  #endif
 
   millis_t ms = millis();
 
@@ -2180,7 +2184,7 @@ void Temperature::disable_all_heaters() {
 
     WRITE_MAX6675(HIGH); // disable TT_MAX6675
 
-    if (max6675_temp & MAX6675_ERROR_MASK) {
+    if (DISABLED(IGNORE_THERMOCOUPLE_ERRORS) && (max6675_temp & MAX6675_ERROR_MASK)) {
       max6675_errors[hindex] += 1;
       if (max6675_errors[hindex] > THERMOCOUPLE_MAX_ERRORS) {
         SERIAL_ERROR_START();
@@ -2201,17 +2205,14 @@ void Temperature::disable_all_heaters() {
         max6675_temp = 4 * (
           #if COUNT_6675 > 1
             hindex ? HEATER_1_MAX6675_TMAX : HEATER_0_MAX6675_TMAX
-          #elif ENABLED(HEATER_1_USES_MAX6675)
-            HEATER_1_MAX6675_TMAX
           #else
-            HEATER_0_MAX6675_TMAX
+            TERN(HEATER_1_USES_MAX6675, HEATER_1_MAX6675_TMAX, HEATER_0_MAX6675_TMAX)
           #endif
         );
       }
-      else {
+      else
         max6675_temp >>= MAX6675_DISCARD_BITS;
     }
-    }
     else {
       max6675_temp >>= MAX6675_DISCARD_BITS;
       max6675_errors[hindex] = 0;