initial commit

include/tuning_store.h

@@ -0,0 +1,45 @@
+#pragma once
+
+#include <Arduino.h>
+#include <EEPROM.h>
+
+#include "config.h"
+
+static const uint16_t TUNING_MAGIC = 0xDA7A;
+static const int TUNING_EEPROM_ADDR = 0;
+
+struct TuningData {
+  uint16_t magic = 0;
+  float kp = PID_KP;
+  float ki = PID_KI;
+  float kd = PID_KD;
+  uint8_t fanMixMax = FAN_MIX_MAX_PWM;
+};
+
+inline uint8_t tuningChecksum(const TuningData &data) {
+  const uint8_t *bytes = reinterpret_cast<const uint8_t *>(&data);
+  uint8_t sum = 0;
+  for (uint8_t i = 0; i < sizeof(TuningData) - 1; ++i) {
+    sum ^= bytes[i];
+  }
+  return sum;
+}
+
+inline bool tuningLoad(TuningData &out) {
+  EEPROM.get(TUNING_EEPROM_ADDR, out);
+  const uint8_t stored = EEPROM.read(TUNING_EEPROM_ADDR + sizeof(TuningData));
+  if (out.magic != TUNING_MAGIC) {
+    return false;
+  }
+  return tuningChecksum(out) == stored;
+}
+
+inline void tuningSave(const TuningData &data) {
+  EEPROM.put(TUNING_EEPROM_ADDR, data);
+  EEPROM.write(TUNING_EEPROM_ADDR + sizeof(TuningData), tuningChecksum(data));
+}
+
+inline void tuningClear() {
+  TuningData cleared;
+  tuningSave(cleared);
+}