rewrite adalight parser

wled00/wled04_file.ino

@@ -1,38 +1,77 @@
 /*
  * Utility for SPIFFS filesystem & Serial console
  */
+enum class AdaState {
+  Header_A,
+  Header_d,
+  Header_a,
+  Header_CountHi,
+  Header_CountLo,
+  Header_CountCheck,
+  Data_Red,
+  Data_Green,
+  Data_Blue
+};
+
 void handleSerial()
 {
-  if (Serial.available() > 0) //support for Adalight protocol to high-speed control LEDs over serial
+  static auto state = AdaState::Header_A;
+  static unsigned int count = 0;
+  static unsigned int pixel = 0;
+  static byte check = 0x00;
+  static byte red   = 0x00;
+  static byte green = 0x00;
+  static byte blue  = 0x00;
+  while (Serial.available() > 0)
   {
-    if (!Serial.find("Ada")) return;
-     
+    byte next = Serial.read();
+    switch (state) {
+      case AdaState::Header_A:
+        if (next == 'A') state = AdaState::Header_d;
+        break;
+      case AdaState::Header_d:
+        if (next == 'd') state = AdaState::Header_a;
+        else             state = AdaState::Header_A;
+        break;
+      case AdaState::Header_a:
+        if (next == 'a') state = AdaState::Header_CountHi;
+        else             state = AdaState::Header_A;
+        break;
+      case AdaState::Header_CountHi:
+        pixel = 0;
+        count = next * 0x100;
+        check = next;
+        state = AdaState::Header_CountLo;
+        break;
+      case AdaState::Header_CountLo:
+        count += next + 1;
+        check = check ^ next ^ 0x55;
+        state = AdaState::Header_CountCheck;
+        break;
+      case AdaState::Header_CountCheck:
+        if (check == next) state = AdaState::Data_Red;
+        else               state = AdaState::Header_A;
+        break;
+      case AdaState::Data_Red:
+        red   = next;
+        state = AdaState::Data_Green;
+        break;
+      case AdaState::Data_Green:
+        green = next;
+        state = AdaState::Data_Blue;
+        break;
+      case AdaState::Data_Blue:
+        blue  = next;
+        setRealtimePixel(pixel++, red, green, blue, 0);
+        if (--count > 0) state = AdaState::Data_Red;
+        else             state = AdaState::Header_A;
+        break;
+    }
+
     if (!realtimeActive && bri == 0) strip.setBrightness(briLast);
     arlsLock(realtimeTimeoutMs);
-    
+
     yield();
-    byte hi = Serial.read();
-    byte ledc = Serial.read();
-    byte chk = Serial.read();
-    if(chk != (hi ^ ledc ^ 0x55)) return;
-    if (ledCount < ledc) ledc = ledCount;
-    
-    byte sc[3]; int t =-1; int to = 0;
-    for (int i=0; i < ledc; i++)
-    {
-      for (byte j=0; j<3; j++)
-      {
-        while (Serial.peek()<0) //no data yet available
-        {
-          yield();
-          to++;
-          if (to>15) {strip.show(); return;} //unexpected end of transmission
-        }
-        to = 0;
-        sc[j] = Serial.read();
-      }
-      setRealtimePixel(i,sc[0],sc[1],sc[2],0);
-    }
     strip.show();
   }
 }