From ba8924fae17f7f621b262af019baedc517c5de10 Mon Sep 17 00:00:00 2001
From: s3lph <s3lph@kabelsalat.ch>
Date: Sat, 29 Apr 2023 00:11:10 +0200
Subject: [PATCH] feat: add 7-segment display callsign editor; store callsign
 in eeprom

---
 include/eepromedit.hpp | 124 +++++++++++++++++++++++++++++++++++++++++
 src/main.cpp           |  13 +++--
 2 files changed, 133 insertions(+), 4 deletions(-)
 create mode 100644 include/eepromedit.hpp

diff --git a/include/eepromedit.hpp b/include/eepromedit.hpp
new file mode 100644
index 0000000..3daa8f9
--- /dev/null
+++ b/include/eepromedit.hpp
@@ -0,0 +1,124 @@
+#include <Arduino.h>
+#include <EEPROM.h>
+
+#define ALPHABET_SIZE 37
+#define EEPROM_BASE 42
+
+//  6
+// 4 5
+//  3
+// 1 2
+//  0
+uint8_t dispMap[ALPHABET_SIZE+1] = { 0x00, 0x77, 0x24, 0x6b, 0x6d, 0x3c, 0x5d, 0x5f, 0x64, 0x7f, 0x7d, 0x7e, 0x1f, 0x53, 0x2f, 0x5b, 0x5a, 0x57, 0x1e, 0x12, 0x25, 0x3c, 0x13, 0x76, 0x0e, 0x0f, 0x7a, 0x7c, 0x0a, 0x55, 0x1b, 0x07, 0x37, 0x3f, 0x06, 0x3d, 0x63 };
+char charMap[ALPHABET_SIZE] = { ' ', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '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' };
+uint8_t *pinMap;
+
+uint8_t state = 0;
+volatile bool advanceState = 0;
+volatile bool advanceDigit = 0;
+
+void nextState() {
+  advanceState = true;
+}
+
+void cycleDigit() {
+  advanceDigit = true;
+}
+
+void showDigit(char digit, bool dot) {
+  // add 0 for SSID hexdump
+  if (digit < 10) {
+    digit += '0';
+  } else if (digit < 16) {
+    digit += 'A' - 10;
+  }
+  uint8_t output = 0x08;
+  for (uint8_t i = 0; i < ALPHABET_SIZE; ++i) {
+    if (charMap[i] == digit) {
+      output = dispMap[i];
+      break;
+    }
+  }
+  if (dot) {
+    output |= 0x80;
+  }
+  for (uint8_t i = 0; i < 8; ++i) {
+    digitalWrite(pinMap[i], (output >> i) & 1);
+  }
+}
+
+void loadFromEeprom(char *str, uint8_t len, uint8_t eeprom_base) {
+  if (EEPROM.read(eeprom_base) != 0x42) {
+    for (uint8_t i = 0; i < len; ++i) {
+      EEPROM.update(eeprom_base+1+i, str[i]);
+    }
+    // Write EEPROM init flag last
+    EEPROM.write(eeprom_base, 0x42);
+  }
+  for (uint8_t i = 0; i < len; ++i) {
+    str[i] = EEPROM.read(eeprom_base+1+i);
+  }
+}
+
+void clearDisplay() {
+  showDigit(' ', false);
+}
+
+void display(char *str, uint8_t len) {
+  for (uint8_t i = 0; i < len; ++i) {
+    showDigit(str[i], false);
+    delay(1000);
+  }
+  clearDisplay();
+}
+
+void editor(char *str, uint8_t len, uint16_t eeprom_base) {
+  attachInterrupt(digitalPinToInterrupt(2), nextState, FALLING);
+  attachInterrupt(digitalPinToInterrupt(3), cycleDigit, FALLING);
+  while (true) {
+    if (advanceDigit) {
+      advanceDigit = false;
+      if (str[state] < 16) {
+	str[state] = (str[state] + 1) % 16;
+      } else {
+	for (uint8_t i = 0; i < ALPHABET_SIZE; ++i) {
+	  if (charMap[i] == str[state]) {
+	    str[state] = charMap[(i+1)%ALPHABET_SIZE];
+	    break;
+	  }
+	}
+      }
+    }
+    if (advanceState) {
+      advanceState = false;
+      state++;
+    }
+    if (state >= len) {
+      for (uint8_t i = 0; i < len; ++i) {
+	EEPROM.update(eeprom_base+1+i, str[i]);
+      }
+      display(str, len);
+      return;
+    } else {
+      showDigit(str[state], true);    
+    }
+  }
+}
+
+void initEditor(char *str, uint8_t len, uint16_t eeprom_base, uint8_t *initPinMap) {
+  loadFromEeprom(str, len, eeprom_base);
+  pinMap = initPinMap;
+  for (uint8_t i = 0; i < 8; ++i) {
+    pinMode(pinMap[i], OUTPUT);
+    digitalWrite(pinMap[i], LOW);
+  }
+  pinMode(2, INPUT_PULLUP);
+  pinMode(3, INPUT_PULLUP);
+  delay(500);
+  if (!digitalRead(2)) {
+    while (!digitalRead(2));    
+    editor(str, len, eeprom_base);
+  } else {
+    display(str, len);
+  }
+}
diff --git a/src/main.cpp b/src/main.cpp
index 0764818..d66b6eb 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -3,11 +3,15 @@
 #include <util/crc16.h>
 
 #include "afsk_sinus.hpp"
+#include "eepromedit.hpp"
 
-#define CALLSIGN "HB3YBQ"
 #define DESTINATION "GPS   "
 #define TXDELAY 32
 
+#define EDITOR_EEPROM_BASE 42
+char callsign[7] = { ' ', ' ', ' ', ' ', ' ', ' ', '\0' };
+uint8_t editorPinMap[8] = { 10, 11, 4, 6, 7, 8, 9, 5 };
+
 struct ax25 {
   uint8_t daddr[7];
   uint8_t saddr[7];
@@ -99,13 +103,13 @@ void sendBell202buf(uint8_t *buf, size_t len, bool sync) {
 void initFrame() {
   memset(&frame, 0, sizeof(frame));
   memcpy(&frame.daddr, DESTINATION, 6);
-  memcpy(&frame.saddr, CALLSIGN, 6);
+  memcpy(&frame.saddr, callsign, 6);
   for (uint8_t i = 0; i < 7; ++i) {
     frame.daddr[i] <<=1;
     frame.saddr[i] <<=1;
   }
   frame.daddr[6] = (NONE << 1) | 0xe0; // command bit + reserved bits (AX.25 3.12.2)
-  frame.saddr[6] = (BICYCLE << 1) | 0xe1;  // command bit + reserved bits + end bit
+  frame.saddr[6] = (callsign[6] << 1) | 0xe1;  // command bit + reserved bits + end bit
   frame.ctrl = 0x03;
   frame.proto = 0xf0;
 }
@@ -117,6 +121,7 @@ uint8_t mirrorByte(uint8_t byt) {
 }
 
 void setup() {
+  initEditor(callsign, 7, EDITOR_EEPROM_BASE, editorPinMap);
   OUT_DDR = 0x3f;
   setZero();
   nrzi = true;
@@ -168,7 +173,7 @@ void readNmeaGll() {
       if (byt == '\n') {
 	state = 2;
 	*sptr = 0;
-	if (str[3] == 'G' && str[4] == 'L' && str[5] == 'L') {
+	if (str[3] == 'R' && str[4] == 'M' && str[5] == 'C' && *(sptr-6) == 'A') {
 	  state = 2;
 	} else {
 	  state = 0;