Reduce, clean up code for mintemp/maxtemp tests

Marlin/temperature.cpp

   } // switch(temp_state)
 
   if (temp_count >= OVERSAMPLENR) { // 10 * 16 * 1/(16000000/64/256)  = 164ms.
+
+    temp_count = 0;
+
     // Update the raw values if they've been read. Else we could be updating them during reading.
     if (!temp_meas_ready) set_current_temp_raw();
 
       current_raw_filwidth = raw_filwidth_value >> 10;  // Divide to get to 0-16384 range since we used 1/128 IIR filter approach
     #endif
 
-    temp_count = 0;
-    for (int i = 0; i < 4; i++) raw_temp_value[i] = 0;
+    ZERO(raw_temp_value);
     raw_temp_bed_value = 0;
 
-    #if HAS_TEMP_0 && DISABLED(HEATER_0_USES_MAX6675)
-      #if HEATER_0_RAW_LO_TEMP > HEATER_0_RAW_HI_TEMP
-        #define GE0 <=
+    int constexpr temp_dir[] = {
+      #if ENABLED(HEATER_0_USES_MAX6675)
+         0
+      #elif HEATER_0_RAW_LO_TEMP > HEATER_0_RAW_HI_TEMP
+        -1
       #else
-        #define GE0 >=
+         1
       #endif
-      if (current_temperature_raw[0] GE0 maxttemp_raw[0]) max_temp_error(0);
-      if (minttemp_raw[0] GE0 current_temperature_raw[0] && !is_preheating(0) && target_temperature[0] > 0.0f) {
-        #ifdef MAX_CONSECUTIVE_LOW_TEMPERATURE_ERROR_ALLOWED
-          if (++consecutive_low_temperature_error[0] >= MAX_CONSECUTIVE_LOW_TEMPERATURE_ERROR_ALLOWED)
+      #if HAS_TEMP_1 && HOTENDS > 1
+        #if HEATER_1_RAW_LO_TEMP > HEATER_1_RAW_HI_TEMP
+          , -1
+        #else
+          ,  1
         #endif
-            min_temp_error(0);
-      }
-      #ifdef MAX_CONSECUTIVE_LOW_TEMPERATURE_ERROR_ALLOWED
-        else
-          consecutive_low_temperature_error[0] = 0;
       #endif
-    #endif
-
-    #if HAS_TEMP_1 && HOTENDS > 1
-      #if HEATER_1_RAW_LO_TEMP > HEATER_1_RAW_HI_TEMP
-        #define GE1 <=
-      #else
-        #define GE1 >=
-      #endif
-      if (current_temperature_raw[1] GE1 maxttemp_raw[1]) max_temp_error(1);
-      if (minttemp_raw[1] GE1 current_temperature_raw[1] && !is_preheating(1) && target_temperature[1] > 0.0f) {
-        #ifdef MAX_CONSECUTIVE_LOW_TEMPERATURE_ERROR_ALLOWED
-          if (++consecutive_low_temperature_error[1] >= MAX_CONSECUTIVE_LOW_TEMPERATURE_ERROR_ALLOWED)
+      #if HAS_TEMP_2 && HOTENDS > 2
+        #if HEATER_2_RAW_LO_TEMP > HEATER_2_RAW_HI_TEMP
+          , -1
+        #else
+          ,  1
         #endif
-          min_temp_error(1);
-      }
-      #ifdef MAX_CONSECUTIVE_LOW_TEMPERATURE_ERROR_ALLOWED
-        else
-          consecutive_low_temperature_error[1] = 0;
-      #endif
-    #endif // TEMP_SENSOR_1
-
-    #if HAS_TEMP_2 && HOTENDS > 2
-      #if HEATER_2_RAW_LO_TEMP > HEATER_2_RAW_HI_TEMP
-        #define GE2 <=
-      #else
-        #define GE2 >=
       #endif
-      if (current_temperature_raw[2] GE2 maxttemp_raw[2]) max_temp_error(2);
-      if (minttemp_raw[2] GE2 current_temperature_raw[2] && !is_preheating(2) && target_temperature[2] > 0.0f) {
-        #ifdef MAX_CONSECUTIVE_LOW_TEMPERATURE_ERROR_ALLOWED
-          if (++consecutive_low_temperature_error[2] >= MAX_CONSECUTIVE_LOW_TEMPERATURE_ERROR_ALLOWED)
+      #if HAS_TEMP_3 && HOTENDS > 3
+        #if HEATER_3_RAW_LO_TEMP > HEATER_3_RAW_HI_TEMP
+          , -1
+        #else
+          ,  1
         #endif
-          min_temp_error(2);
-      }
-      #ifdef MAX_CONSECUTIVE_LOW_TEMPERATURE_ERROR_ALLOWED
-        else
-          consecutive_low_temperature_error[2] = 0;
       #endif
-    #endif // TEMP_SENSOR_2
+    };
 
-    #if HAS_TEMP_3 && HOTENDS > 3
-      #if HEATER_3_RAW_LO_TEMP > HEATER_3_RAW_HI_TEMP
-        #define GE3 <=
-      #else
-        #define GE3 >=
-      #endif
-      if (current_temperature_raw[3] GE3 maxttemp_raw[3]) max_temp_error(3);
-      if (minttemp_raw[3] GE3 current_temperature_raw[3] && !is_preheating(3) && target_temperature[3] > 0.0f) {
+    for (uint8_t e = 0; e < COUNT(temp_dir); e++) {
+      const int tdir = temp_dir[e], rawtemp = current_temperature_raw[e] * tdir;
+      if (rawtemp > maxttemp_raw[e] * tdir) max_temp_error(e);
+      if (rawtemp < minttemp_raw[e] * tdir && !is_preheating(e) && target_temperature[e] > 0.0f) {
         #ifdef MAX_CONSECUTIVE_LOW_TEMPERATURE_ERROR_ALLOWED
-          if (++consecutive_low_temperature_error[3] >= MAX_CONSECUTIVE_LOW_TEMPERATURE_ERROR_ALLOWED)
+          if (++consecutive_low_temperature_error[e] >= MAX_CONSECUTIVE_LOW_TEMPERATURE_ERROR_ALLOWED)
         #endif
-          min_temp_error(3);
+            min_temp_error(e);
       }
       #ifdef MAX_CONSECUTIVE_LOW_TEMPERATURE_ERROR_ALLOWED
         else
-          consecutive_low_temperature_error[3] = 0;
+          consecutive_low_temperature_error[e] = 0;
       #endif
-    #endif // TEMP_SENSOR_3
+    }
 
     #if HAS_TEMP_BED
       #if HEATER_BED_RAW_LO_TEMP > HEATER_BED_RAW_HI_TEMP