Hi, 
 
Where is does my H went   in the readChar  function?
 

Start your code here
#include <EEPROM.h>
//#include <Arduino.h>
#define EEPROM_SIZE 40

void writeChar(uint8_t ad, const char *ch)
{
printf("%d\n", ad);
printf("%d: %c\n", ad++, *ch);
EEPROM.write(ad, *ch);
EEPROM.commit();
while (*ch++ != '\0') {
EEPROM.write(ad, *ch);
EEPROM.commit();
printf("%d: %c\n", ad++, *ch);
}
}
void readChar(uint8_t ad)
{
uint8_t ch = '\0';
ch = EEPROM.read(ad++);
Serial.printf("%c", ch);
while (ch != '\0') {
Serial.printf("%c", ch);
ch = EEPROM.read(ad++);//ch address is always the same
}
}
void setup() {
Serial.begin (115200);
EEPROM.begin(EEPROM_SIZE);
const char *hel = "Hello once in a while.";
writeChar(7, hel);
Serial.println("\n----------------------------");
readChar(7);
Serial.println("\n----------------");
Serial.println(EEPROM.read(0));
Serial.println(EEPROM.read(1));
Serial.println(EEPROM.read(2));
Serial.println(EEPROM.read(3));
Serial.println(EEPROM.read(4));
Serial.println("\n----------------");
Serial.println((char)EEPROM.read(7));
Serial.println((char)EEPROM.read(8));
//EEPROM.write(0,'H');//Reset memory value
//EEPROM.write(1,'e');
//EEPROM.write(2,'l');
//EEPROM.write(3,'l');
//EEPROM.write(4,'o');
//EEPROM.commit();
}
void loop() {
}

Start your code hereentry 0x400806ac
7
7: H
8: e
9: l
10: l
11: o
12: 
13: o
14: n
15: c
16: e
17: 
18: i
19: n
20: 
21: a
22: 
23: w
24: h
25: i
26: l
27: e
28: .
29:
---------  readChar  -------------------
⸮⸮ello once in a while.
----------------
72
101
108
108
111

----------------
⸮
e
 

Regards
 
JPDaviua