Merge branch 'main' of tesserakt.pro:alex/arduino-filament-dryer

include/settings_store.h

@@ -0,0 +1,50 @@
+#pragma once
+
+#include <Arduino.h>
+#include <EEPROM.h>
+
+#include "config.h"
+
+// After TuningData (15 bytes) + checksum (1 byte) at address 0
+static const uint16_t SETTINGS_MAGIC = 0xDA7E;
+static const int SETTINGS_EEPROM_ADDR = 16;
+
+struct SettingsData {
+  uint16_t magic = 0;
+  float targetC = TARGET_TEMP_C;
+};
+
+inline uint8_t settingsChecksum(const SettingsData &data) {
+  const uint8_t *bytes = reinterpret_cast<const uint8_t *>(&data);
+  uint8_t sum = 0;
+  for (uint8_t i = 0; i < sizeof(SettingsData) - 1; ++i) {
+    sum ^= bytes[i];
+  }
+  return sum;
+}
+
+inline bool settingsLoad(SettingsData &out) {
+  EEPROM.get(SETTINGS_EEPROM_ADDR, out);
+  const uint8_t stored = EEPROM.read(SETTINGS_EEPROM_ADDR + sizeof(SettingsData));
+  if (out.magic != SETTINGS_MAGIC) {
+    return false;
+  }
+  return settingsChecksum(out) == stored;
+}
+
+inline void settingsSave(const SettingsData &data) {
+  EEPROM.put(SETTINGS_EEPROM_ADDR, data);
+  EEPROM.write(SETTINGS_EEPROM_ADDR + sizeof(SettingsData), settingsChecksum(data));
+}
+
+inline void settingsSaveTarget(float targetC) {
+  SettingsData data;
+  data.magic = SETTINGS_MAGIC;
+  data.targetC = targetC;
+  settingsSave(data);
+}
+
+inline void settingsClear() {
+  SettingsData cleared;
+  settingsSave(cleared);
+}

include/thermal_controller.h

@@ -5,6 +5,7 @@
 #include "config.h"
 #include "pid_autotuner.h"
 #include "pid_controller.h"
+#include "settings_store.h"
 #include "tuning_store.h"
 
 class ThermalController {
@@ -54,6 +55,12 @@ public:
       Serial.println(F("Loaded learned PID from EEPROM"));
       printTuning();
     }
+
+    SettingsData settings;
+    if (settingsLoad(settings) && settings.targetC >= TARGET_MIN_C &&
+        settings.targetC <= TARGET_MAX_C) {
+      setTarget(settings.targetC, false);
+    }
   }
 
   void applyTuning(const TuningData &data) {
@@ -132,7 +139,7 @@ public:
     return true;
   }
 
-  void setTarget(float targetC) {
+  void setTarget(float targetC, bool persist = true) {
     targetTempC_ = targetC;
     pid_.setSetpoint(targetC);
     pid_.reset();
@@ -144,6 +151,9 @@ public:
       fanIdleOverride_ = false;
     }
     applyFan();
+    if (persist && targetC >= TARGET_MIN_C && targetC <= TARGET_MAX_C) {
+      settingsSaveTarget(targetC);
+    }
   }
 
   void noteSensorMax(float maxTempC) {