Reorganized file structure to allow building Arduino project

UIThread.cpp

@@ -1,9 +1,14 @@
+#include <mutex>
 #include "UIThread.h"
 #include "SharedState.h"
 #include <Arduino.h>
 #include <Wire.h>
 #include <Adafruit_GFX.h>
 #include <Adafruit_SSD1306.h>
+#include "synth_engine.h"
+#include <EEPROM.h>
+
+extern SynthEngine* globalSynth;
 
 #define SCREEN_WIDTH 128
 #define SCREEN_HEIGHT 64
@@ -53,6 +58,32 @@ void readEncoder() {
   }
 }
 
+void saveGridToEEPROM() {
+    if (!globalSynth) return;
+    uint8_t buf[SynthEngine::SERIALIZED_GRID_SIZE];
+    globalSynth->exportGrid(buf);
+    
+    EEPROM.write(0, 'N');
+    EEPROM.write(1, 'S');
+    for (size_t i = 0; i < sizeof(buf); i++) {
+        EEPROM.write(2 + i, buf[i]);
+    }
+    EEPROM.commit();
+}
+
+void loadGridFromEEPROM() {
+    if (!globalSynth) return;
+    if (EEPROM.read(0) == 'N' && EEPROM.read(1) == 'S') {
+        uint8_t buf[SynthEngine::SERIALIZED_GRID_SIZE];
+        for (size_t i = 0; i < sizeof(buf); i++) {
+            buf[i] = EEPROM.read(2 + i);
+        }
+        globalSynth->importGrid(buf);
+    } else {
+        globalSynth->loadPreset(1); // Default to preset 1
+    }
+}
+
 void setupUI() {
   Wire.setSDA(PIN_SDA);
   Wire.setSCL(PIN_SCL);
@@ -71,6 +102,22 @@ void setupUI() {
 
   display.clearDisplay();
   display.display();
+  
+  // Initialize EEPROM
+  EEPROM.begin(512);
+
+  // Check for safety clear (Button held on startup)
+  if (digitalRead(PIN_ENC_SW) == LOW) {
+      display.setCursor(0, 0);
+      display.setTextColor(SSD1306_WHITE);
+      display.println(F("CLEARING DATA..."));
+      display.display();
+      EEPROM.write(0, 0); // Invalidate magic
+      EEPROM.commit();
+      delay(1000);
+  }
+
+  loadGridFromEEPROM();
 }
 
 void handleInput() {
@@ -181,8 +228,44 @@ void drawUI() {
     display.display();
 }
 
+void checkSerial() {
+    static int state = 0; // 0: Header, 1: Data
+    static int headerIdx = 0;
+    static const char* header = "NSGRID";
+    static uint8_t buffer[SynthEngine::SERIALIZED_GRID_SIZE];
+    static int bufferIdx = 0;
+
+    while (Serial.available()) {
+        uint8_t b = Serial.read();
+        if (state == 0) {
+            if (b == header[headerIdx]) {
+                headerIdx++;
+                if (headerIdx == 6) {
+                    state = 1;
+                    bufferIdx = 0;
+                    headerIdx = 0;
+                }
+            } else {
+                headerIdx = 0;
+                if (b == 'N') headerIdx = 1; 
+            }
+        } else if (state == 1) {
+            buffer[bufferIdx++] = b;
+            if (bufferIdx == SynthEngine::SERIALIZED_GRID_SIZE) {
+                if (globalSynth) {
+                    globalSynth->importGrid(buffer);
+                    saveGridToEEPROM();
+                }
+                state = 0;
+                bufferIdx = 0;
+            }
+        }
+    }
+}
+
 void loopUI() {
   handleInput();
+  checkSerial();
   drawUI();
   delay(20); // Prevent excessive screen refresh
 }