Add hysteresys to max water temp handling

diff --git a/v10/main.c b/v10/main.c
index 6f60cbb..8d5e66f 100644 (file)
--- a/v10/main.c
+++ b/v10/main.c
@@ -69,14 +69,16 @@ volatile char mode = mode_heat;
 volatile char old_mode = mode_heat;
 
 /* Water temperature */
-int water_centi_degrees = 0;
+volatile int water_centi_degrees = 0;
+#define T_HYST  200  /* 2°C */
+#define T_HYST_DELAY  1800  /* 1800 * DEC_PERIOD : 180 seconds : 3 minutes */
+volatile int temp_OK_hysteresys = 0;
+
 
 /* Internal temperatures */
 int deci_degrees_power = 0; /* Power board sensor */
 int deci_degrees_disp = 0; /* Display board sensor */
 
-/* Set to ABSOLUTE_MAX_WATER_TEMP - 1.5°C when enabling max temp hysteresis */
-int max_temp_hysteresys = 0;
 
 /* Value in mA computed upon startup from config ext_source_power_limit */
 int32_t max_intensity = 0;
@@ -111,6 +113,12 @@ void handle_dec_request(uint32_t curent_tick)
                        overvoltage--;
                }
        }
+       /* Decrease temp hysteresys only when getting bellow max configuration temperature by T_HYST */
+       if (temp_OK_hysteresys > 0) {
+               if (water_centi_degrees < (sc_conf.conf_max_temp - T_HYST)) {
+                       temp_OK_hysteresys--;
+               }
+       }
 }
 
 
@@ -231,6 +239,10 @@ void handle_cmd_update(uint32_t curent_tick)
                                force_fan = 1;
                        }
                        break;
+               case mode_water_critical:
+                       /* Water over-temperature limit reached */
+                       cmd = 0;
+                       break;
                case mode_manual:
                case mode_forced:
                        /* Forced heating mode */
@@ -394,14 +406,30 @@ void mode_update(void)
        }
        /* Mosfet temperature limit reached or internal temperature above max internal temp */
        if ((mosfet_temp_shutdown != 0) || (internal_temp_error_shutdown < 0)) {
-               old_mode = mode;
-               mode = mode_overtemp;
+               if (mode != mode_overtemp) {
+                       old_mode = mode;
+                       mode = mode_overtemp;
+               }
+               return;
+       }
+       /* Water temperature above absolute maximum limit ? */
+       if (water_centi_degrees >= ABSOLUTE_MAX_WATER_TEMP) {
+               if (mode != mode_water_critical) {
+                       old_mode = mode;
+                       mode = mode_water_critical;
+               }
                return;
        }
 
        /* Water temperature reached config limit ? */
        if (water_centi_degrees >= sc_conf.conf_max_temp) {
                mode = mode_temp_OK; /* Max temperature reached */
+               temp_OK_hysteresys = T_HYST_DELAY;
+               return;
+       }
+       if (temp_OK_hysteresys > 0) {
+               mode = mode_temp_OK; /* Max temperature reached */
+               /* Do not decrease temp hysteresys here to get more precise duration */
                return;
        }