From 84ec38dcf6464b3b664da2b0302eb611bb4b378f Mon Sep 17 00:00:00 2001
From: Dustin Brunner <75931548+dustinbrun@users.noreply.github.com>
Date: Fri, 15 Aug 2025 20:50:39 +0200
Subject: [PATCH] initial software

---
 morse_decoder/morse_decoder.ino | 172 ++++++++++++++++++++++++++++++++
 1 file changed, 172 insertions(+)
 create mode 100644 morse_decoder/morse_decoder.ino

diff --git a/morse_decoder/morse_decoder.ino b/morse_decoder/morse_decoder.ino
new file mode 100644
index 0000000..4c30a8e
--- /dev/null
+++ b/morse_decoder/morse_decoder.ino
@@ -0,0 +1,172 @@
+#include <Arduino.h>
+#include <U8g2lib.h>
+#include <Wire.h>
+
+#include "private/logo_svntk.h"
+
+#define BUTTON_PIN D5
+#define BUTTON_ONBOARD_PIN D6
+#define LED_PIN LED_BUILTIN
+
+#define DOT_THRESHOLD 250
+#define LETTER_PAUSE 1500
+#define TEXT_CLEAR_TIMEOUT 10000
+
+#define DEBOUNCE_DELAY 30
+
+U8G2_SH1106_128X64_NONAME_F_HW_I2C u8g2(U8G2_R0);
+
+String currentMorse = "";
+String currentWord = "";
+
+unsigned long pressStartTime = 0;
+unsigned long lastInputTime = 0;
+unsigned long lastActivityTime = 0;
+bool rawButtonState;
+bool lastButtonState = HIGH;
+bool debouncedButtonState = HIGH;
+bool isPressing = false;
+int pressDuration = 0;
+unsigned long lastDebounceTime = 0;
+
+struct MorseSymbol {
+  const char* code;
+  char letter;
+};
+
+MorseSymbol morseTable[] = {
+  {".-", 'A'}, {"-...", 'B'}, {"-.-.", 'C'}, {"-..", 'D'},
+  {".", 'E'}, {"..-.", 'F'}, {"--.", 'G'}, {"....", 'H'},
+  {"..", 'I'}, {".---", 'J'}, {"-.-", 'K'}, {".-..", 'L'},
+  {"--", 'M'}, {"-.", 'N'}, {"---", 'O'}, {".--.", 'P'},
+  {"--.-", 'Q'}, {".-.", 'R'}, {"...", 'S'}, {"-", 'T'},
+  {"..-", 'U'}, {"...-", 'V'}, {".--", 'W'}, {"-..-", 'X'},
+  {"-.--", 'Y'}, {"--..", 'Z'},
+  {"-----", '0'}, {".----", '1'}, {"..---", '2'}, {"...--", '3'},
+  {"....-", '4'}, {".....", '5'}, {"-....", '6'}, {"--...", '7'},
+  {"---..", '8'}, {"----.", '9'}
+};
+
+char decodeMorse(String code) {
+  for (int i = 0; i < sizeof(morseTable) / sizeof(morseTable[0]); i++) {
+    if (code.equals(morseTable[i].code)) {
+      return morseTable[i].letter;
+    }
+  }
+  return '?';
+}
+
+void drawStatus() {
+  u8g2.clearBuffer();
+  u8g2.setFont(u8g2_font_fub17_tr);
+
+  u8g2.drawXBMP(128 - 55, 0, 55, 16, epd_bitmap_logo);  // top right corner
+
+  // Zeige Morsezeichen
+  u8g2.drawStr(10, 20, currentMorse.c_str());
+
+  // Zeige dekodierten Text
+  u8g2.drawStr(10, 45, currentWord.c_str());
+
+  // Fortschrittsbalken immer anzeigen (auch wenn nicht gedrückt)
+  u8g2.drawFrame(0, 57, 127, 7);
+  if (isPressing) {
+    int barWidth = map(millis() - pressStartTime, 0, DOT_THRESHOLD, 0, 128);
+    if (barWidth > 128) barWidth = 128;
+    u8g2.drawBox(0, 57, barWidth, 7);
+  }
+
+  u8g2.sendBuffer();
+}
+
+void setup() {
+  pinMode(BUTTON_PIN, INPUT_PULLUP);
+  pinMode(BUTTON_ONBOARD_PIN, INPUT_PULLUP);
+  pinMode(LED_PIN, OUTPUT);
+  Serial.begin(115200);
+  u8g2.begin();
+  u8g2.enableUTF8Print();
+  drawStatus();
+  Serial.println("Morse Decoder bereit");
+}
+
+void loop() {
+  rawButtonState = digitalRead(BUTTON_ONBOARD_PIN);
+  rawButtonState &= digitalRead(BUTTON_PIN);
+  unsigned long now = millis();
+
+  digitalWrite(LED_PIN, debouncedButtonState);
+
+  if (rawButtonState != lastButtonState) {
+    lastDebounceTime = now;
+  }
+  lastButtonState = rawButtonState;
+
+  if ((now - lastDebounceTime) > DEBOUNCE_DELAY) {
+
+    if (rawButtonState != debouncedButtonState) {
+      debouncedButtonState = rawButtonState;
+
+      // Taster gedrückt
+      if (debouncedButtonState == LOW) {
+        pressStartTime = now;
+        isPressing = true;
+      }
+      // Taster losgelassen
+      else {
+        pressDuration = now - pressStartTime;
+        lastInputTime = now;
+        lastActivityTime = now;
+        isPressing = false;
+
+        if (pressDuration < DOT_THRESHOLD) {
+          currentMorse += ".";
+          Serial.println("Eingabe: Punkt (.)");
+        } else {
+          currentMorse += "-";
+          Serial.println("Eingabe: Strich (-)");
+        }
+
+        Serial.print("Aktueller Morsecode: ");
+        Serial.println(currentMorse);
+      }
+    }
+
+    // Buchstabe fertig
+    if (currentMorse.length() > 0 && (now - lastInputTime > LETTER_PAUSE)) {
+      char decoded = decodeMorse(currentMorse);
+      Serial.print("Morse abgeschlossen: ");
+      Serial.println(currentMorse);
+      Serial.print("Dekodiert: ");
+      Serial.println(decoded);
+
+      if (currentMorse.length() > 5) {
+        Serial.println("Morsecode zu lang - Eingabe zurückgesetzt.");
+        currentMorse = "";
+        currentWord = "";
+        lastActivityTime = millis();
+      }
+      currentMorse = "";
+
+      if (decoded != '?') {
+        currentWord += decoded;
+        if (currentWord.length() > 7) {
+          currentWord = currentWord.substring(currentWord.length() - 7);
+        }
+      }
+
+      lastActivityTime = now;
+      Serial.print("Aktueller Text: ");
+      Serial.println(currentWord);
+    }
+  }
+
+  // Text löschen nach Timeout
+  if (currentWord.length() > 0 && (now - lastActivityTime > TEXT_CLEAR_TIMEOUT)) {
+    currentWord = "";
+    Serial.println("Text automatisch gelöscht wegen Inaktivität.");
+  }
+
+  drawStatus();
+}
+