Issue_231: Fix logging of card data (bad order)

README.md

@@ -90,7 +90,8 @@ Die SD Karte (Ordner mp3 und advert) hat sich gegenüber der Version 3.1.11 geä
 
 # Change Log
 
-## Version 3.2.0 (28.08.2024)
+## Version 3.2.0 (05.09.2024)
+- [Issue 231](https://github.com/tonuino/TonUINO-TNG/issues/231): Fix logging of card data (bad order)
 - [Issue 229](https://github.com/tonuino/TonUINO-TNG/issues/229): playAdvertisement does not work for some DF Player
 - [Issue 228](https://github.com/tonuino/TonUINO-TNG/issues/228): NeoPixel for two Rings with Sleep modification card: no update on one ring
 - [Issue 226](https://github.com/tonuino/TonUINO-TNG/issues/226): Use MegaCoreX as Board package for Nano Every instead of Arduino megaAVR Boards

TonUINO-TNG.ino

@@ -35,7 +35,7 @@ void setup()
   LOG(init_log, s_error, F("TonUINO Version 3.1 - refactored by Boerge1\n"));
   LOG(init_log, s_error, F("created by Thorsten Voß and licensed under GNU/GPL."));
   LOG(init_log, s_error, F("Information and contribution at https://tonuino.de.\n"));
-  LOG(init_log, s_error, F("V3.2.0 28.08.24\n"));
+  LOG(init_log, s_error, F("V3.2.0 05.09.24\n"));
 
 #ifdef TonUINO_Classic
   LOG(init_log, s_error, F("C "), lf_no);

src/chip_card.cpp

@@ -24,26 +24,25 @@ const __FlashStringHelper *str_MIFARE_Write() { return F("MIFARE_Write "); }
 /**
   Helper routine to dump a byte array as hex values to Serial.
 */
+constexpr size_t maxBuffferLogSize  = 10;
+char n16_hex(uint8_t number) {
+  if (number >=16)
+    return '?';
+  return (number > 9) ? (number - 10) + 'a' : number + '0';
+}
 void u8toa_hex(uint8_t number, char *arr) {
-  int pos = 0;
-  if (number < 16)
-    arr[pos++] = '0';
-  do {
-    const int r = number % 16;
-    arr[pos++] = (r > 9) ? (r - 10) + 'a' : r + '0';
-    number /= 16;
-  } while (number != 0);
+  arr[0] = n16_hex(number/16);
+  arr[1] = n16_hex(number%16);
 }
 const char* dump_byte_array(byte * buffer, uint8_t bufferSize) {
-  static char ret[3*10+1];
-  ret[0] = '\0';
-  if (bufferSize > 10)
-    return ret;
+  static char ret[3*maxBuffferLogSize+1];
+  if (bufferSize > maxBuffferLogSize)
+    bufferSize = maxBuffferLogSize;
   uint8_t pos = 0;
   for (uint8_t i = 0; i < bufferSize; ++i) {
-    ret[pos++] = ' ';
     u8toa_hex(buffer[i], &ret[pos]);
     pos +=2;
+    ret[pos++] = ' ';
   }
   ret[pos] = '\0';
   return ret;